Hlecfrical ter*fifflcaffi$Er Test amdReview Booklet
Electrical Certification Test and Review This test is basedon the L999National Electrical Code@,a resourceof over 20000electricaltest questions,and dozensof electricalbooksand articles. Each Codequestionis researched using electronicversionsof the 1999NEC@and the 1999 IYEC@Handbookincluding the crossreferenceto the 1996 hl-Ec@. This bookletconsistsof 20 testswith 20 questions Answersand explanations+ text referenceto the 1999I\[EC is locatedbehind eachtest
Test Taking Tips l . Calculatethe time per questionas soonasyou startyour test. This is
l-J I
importantso you will not spendtoo muchtime on one question. If thr." are70 questionsand an allottedtime of four (4) hours,then the time per questionis 4 x SQminutesdividedby 70 or 3.4 minutesper qu.rtiott. If there are70 questionsworth onepoint eachand 3 di"gr"-t worth 10points each,then find the time allowedper point. tlrii woutd be (4 x 60) divided by 100or 2.4 minutesper point. Then allow 24 minutes(10 x2.4) for eachdiagramand2.4minutesper question. ) Answerthe easierquestionsfirst. Leavethe more difEcult onesand mark them so you can go back to them. Do not spendtoo much time on onequestion.This is a classicmistake! J. Answer all questionsevenif you haveto gUess.Rememberyou have a 50 percenfchanceof gettinga trre falsequestioncorrectby simply guessing. 4. Read.t.h questioncarefully. Do not skim over questions.Readeach word! Find out if the testis openbook. If it is, indexyour CodeBook and practiceusingthe indexes. Index the Book beforebegiffIing your studies. o lndex Table 250-L22for finding equipmentgroundingwire sizes. o lndex Table 250-66for finding groundingelectrodeand bondingjumPersizes. o IndexTable8 in Chapter9 for finding circularmil areas, of of bareconductors,andDC resistance dimensions Conductors. o lndex Section240-6for findingthe standardcircuit breakerand fusesizes. Table 430-150,andTable430-152for o lndexTable430-148, sizingmotorcircuits. 6 . Practicelookingup Codequestions.You shouldbe ableto find the answerto any singleanswerCodequestionin lessthan3 minutes. More complexquestions,especiallycalculationproblems,require moretime andmoreCodesections. 7 . Begin your examinationby unloadingthe formulasonto a blankpiece of paper.This is perfectlylegal andsavestime laterwhenyou may not be ableto rememberthe particularformula.
8. For eachandevery questiontry thesefour steps. o Locatethe given infonnation in the question. o Locateany unknown infonnation necessaryto solvethe question. o Locatethe ''KFY' word or phrasein the question. "KEY", and it is a Code o If you cannotfind the answerusing the questionsearchthe Codeindex for ttre "KEYrr word. 9. After completingthe test go back and scanit to make sureyou have answeredeveryquestionandhavenot skippedpagesor blanks. lO.If a questionrequiresthe useof a Table,be sureandreadthe notesto the table. Also remembereachTable has a Sectionnumberthe same as the Table number. The sectionwill have additionalinfonnation pertainingto the Table. thatyou studyno more thaa2 hoursper 1l.It is stronglyrecommended day and shrdyfor about 40 hours prior to taking the journeyman electriciantest,and about80 hoursfor the masterelectriciantest. l2.Be careful aboutwriting formulasin your CodeBook. If you are allowedto useyour own CodeBook at the exam,it may be checkedto makesr:rethat it doesnot havemirterialwritten in it, or you may be givena Codebook to use. l3.If you areallowedto bring a calculatorto the exambuy one andbring it. l4.Get plentyof restbeforetakingthe test. It is alsoa good ideato practicelooking up Codequestionsfor one hourjust beforetaking the Test. This increasestest scoresby as much asten percentfor some people
Must Know List for Taking Electrician'sExaminations
a a a a a
^
,I
Know Ohm'sLaw and the Powerformula. The Basic electricaltheorypag€covers thesefairly well. Buy Ugley'sor Ferm'sfor a more thoroughcoverage.Know everythingon the Theorypageas a minimum. Know how to hookupnine leadstarand deltawound inductionmotors. Know how to solve turns ratio transformerproblems. Know how to hook up three and four way switches. Know how to determinemotor branchcirpuit and feederprotectionand wire sizes. Know key Sectionsin the Code.Theseinclude: l. Article 100 is definitions. 2. Article 90 purposeand scopeof the Code. 3. Artiole 110 rulesfor electricalinstallationssuchas work clearanceand equipmentspacerules. Article 210 for branohoircuit calculations. Articte 220 for serviceand feedercalculations. Article 230 for services. Article 240 is for overcurrentprotection. Article 250 is for grounding. Articte 300 for generalinstallationrulesand methods. Section300-5 for burial dePths. Table310-16with notes. Article 310 for ampacitytables.especially traY. Article 318 for cable Articles in Chapterthree for raceways. Article 348 for EMT. Article 346 for zugrdMetal Conduit. Article 430 for motors. Article 440 for refrigerationequipmentand motor-comPressors. Article 450 for generators. Article 490 for high voltage Article 501 for ClassI, Division I and2locations. Article 600 for signs. Know that for commercialbuilding a 20 ampereoutsidesigrrcircuit is requiredand the load is 1200volt-amP€res. know that emergencyand standbyPowersystemsrequirementsin Articles 700, 701, and702. Theseare extensionsof Article 445 on generators. know that for Hospitalsthereare additionalrequirementsfor emergency powerin Article 517. 25. ifuow that Appendix D hasexamplesfor load calculationsand motor circuits. Readand studYthem. 26. Know that conduitand conductordimensionsareas,etc., are in Chapternine, AppendixC. but for all conductorsof the samesizethe fill tablesare in "low voltage" other and circuits I Class and 27. Know that Class2, Class3, requirementsare in Article 725. 28. Know Article 305 for Constructionsite and temporarywiring.
BasicElectrical Theorv SeriesDirect Current Circuit Rules
Rule #1: The samecurrent flows through each part of a seriescircuit. Rule #22 Total Resistanceof a seriescircuit is equal to the sum of the individual resistances. Rule #3: The total voltage acrossa seriescircuit is equal to the sum of the individual voltage droPs. Rule #4: The voltage drop acrossa resistor in a seriescircuit is proportional to the sizeof the resistor. Rule #5: The total power dissipatedin a seriescircuit is equal to the surn of the individual power dissapations. SUMMARY OF OHMS I'/IW FORMUI-A9
= AMPERES ffi+ANCE = RESTsTANCE ff"*". VOLTS = AMPER,ESx RESISTA|ICE
ParallelDirectCurrent Circuit Rules Rule #1: The samevoltage exists across each branch of a parallel circuit and is equal to the source voltage. Rule #2: The current through a branch of a parallel network is inversety proportional to the amount of resistanceof the branch. Rule #3: The total current of a parallel circuit is equal to the sum of the currents of the indMdual branches of the circuit. Rule #4: The total resistanceof a parallel circuit is equal to the reciprocal of the sum of the reciprocals of the indMdual resistancesof the circuit. Rule #5: The total power dissipated in a parallel circuit is equal to the sum of the individual power dissapations.
SUMMARYOF PAR'4LLELCIRCUITRULES TOTAL VOLTAGE = E(1) = E(2) = E(3) ...etc. VOLTS
= TOTALRESISTANCE AIVfPERES
vo',rs=ffi
TO DEEERT'fINE THE TOtrAJ, RESISTAI{CE
THE I.OTAIJ Ct'RREbIT ATiID TOTAT. VOLTAGE fHE
FOLIOIIII}IG
Rr-
A PARiAILEIT CfRCUIT
fN
WI{EN OF
ERE UNKNOI$T USE ETTIIER
FORMULAS:
l +1+l
*......etc
RI R2 R3 G l
FOR TWO RESISTORSIN PARALLEL USE THIS FORMULA CALLED TIIE ''PRODUCT OVERTM Rr =
SLIMII R(1) t'R(2) R(t)+R(2)
POIiIER IN
SINGI.E PHASE RESISTI\ZE CIRCUTTS
WHERE PO!{ER FACTOR IS
1OO PERCET'NT
EoRMtItAs ARE COM!{ON&I USED lO SOL\'E MOST CTRCUIE PtrilER
(rmsn
ou lesrs) PRoBr.EMs! trO DETERI4INE SERIES
TEE POWER CONSUMED BY All
CTRCUIT USE trEIS
TNDTVIDUAJ, RESISTOR
FORMT]I,A:
pogtER-
t2 r XR
TO DETERI4INE THE POIIER CONSUMED BY A}T INDIVIDUAI PA3ALLEL
CIRCUIT
rN A
USE THIS
FORMUIA:
RESISTOR IN
A
_82
PO!{ER -
R
TO DETIIRMTNE trEE TOTAI1 PO?|ER CONSIIMEID BY AII BIDTWDUAJ., FORMTII,A:
USE TEIS
por{ER- E (TOTAMLTAGE)
RIII,TS '
.
CXRCTTIT
x I (TOTAI CURRENT)
OF TEUMB: TEE IOTAIJ
RESXSTAIICE
r.nSS
TIIE \lALItE
TIIA}I
OB RESISTORS
IS
SAME V?II,I'E
ALI$AYS
OF AI\TY ONE RESISTOR. OF PARATI'EL
TIIE TOTAIJ RESISTA}ICE TEE
XN PARiAJ.LEI. IS
TEAtr VAJ,I'E
RESIStrORS
TEAT ARE AII,
DTVTDED BY IT'EE NUMBTR OE'
RESXSTORS. '
AI.VIB'YS USE TEE PRODUCT O\IER SUM RIII"E PARJAI.I,EIJ RESISEORS XIASIIIR
NflTO ONE RESISTOR.
TEAI{ TRYTNG rO
'
146 !{ATTS IS
'
EFFTCTENCY
.
TN I}IDUCTT.\IE
O
IN
o
POTVER FACTOR IS
rS
CAPACITIVE
LAGS VOLTAGE.
trO EIREiAK DOWN gWO TIIIS
TS MUCE
SOL\IE XJARGE A^IrGEBRAfC EXSRTSSIONS.
EQUAL EO ONE EORSEPOI|ER EQUAL TO OTXPPUT DMDIID CTRCI'IBS CXRCUITS
BY INPLTII
CURRE}III' I,AGS VOIJIA@. CURREDI1I ]JEEDS VOI,TAGE.
A MEliASttRE OF BOW FAR CURRENT IJEiADS OR
I I
CUre
POVTERIN ALrERNAEfNG POWER FACTOR IS POWER = E x I
x POWTR FACTOR
powER = E x I
x
THIS
POWER IS
(ron snrer's PEASE)
PO!{ER FACtrOR (ronrmsr
1.132y-
AISO
NOT 1OO PERCEtflI
CEJ.I.ED trRI'E
POITER OR REAI
PEA.SE) POWER AS OPPOSED
TO APPEREMT PO!{ER FOT'ICD BY CEIJCuILATING VOLtr-AMI{SRES ' VOLT-AI'{PER.ES = E x I
(ron srNer.e euaso)
VoLT-AMPE,RES= E x I x 1.132 IE
CJA}T READIIJY
(ron rmna rnnse)
BE DETERMTNED BY AI,GEBRA EEAT
P O W E RF A C T O R :
APPARENT POWER
MOTOR APPLfCATION
FOR!'IqI{4g
x gtr'ptctexcY x t.232x vol,ts x,rrMPERES IIORSEPOI{ER = (for three Phaseoowerfacjqt 746 motors | THREE PHASE A},IPERES = (for rhree phase motors)
746 X HORSEPOWER 1J32x voLTS x EFFICIENCY x POWER FACTOR
SY}iICHRONOUS RPM
-
HERTZ x ]ZIL NUMBER OF POLES
I{OTOR UERK:INGS
E}ID CONNECTIONS
COXNECTTONS FOR ![I}fE
I.IED
:TEREE PEA,SB }'C)|IORIg
TEREE
PEASE SEAR OR Y
2 }1
v
,-i
\
*f
5
6
l^ \
1
-[ r&7
STAR-fCONNECTED -i-
Lt". ,
Ltn.3
a ,&8 l- 3&e I
i-3
t-
Together
4&5&6 4 & , 7 , 5& 8 ,6 & 9
l
: i
EERTE
PEASE DEI.TA
DELTA CONNECTED
DELIA
W:TE EOOKUP FOR IIRA}TSFORMEIR
I,IOEOR CONTROI..I.ERW:[:TE TEREE StrARE SEOP StrA:IIONS (EOI.DrNG
COInDACTS NOT SEOIIN)
CRANSFOR!,ER TT'TTNS RATTO
Epvolts Tp Turns
E sv o l t s ' TsTurns
Ep - T-p Es Ts Where Ep is primary voltage Es is secondaryvoltage Tp is number of turns in p.imaty Ts is number of tums in secondary
MaximumHorsepower for NEMA-Rated Motor Starters
lls
IZsg l2o8t2so l46ots7s
--[G--P
Volt iVolt lVolt
t oo rrv-lr
t.)
ir
ir=-l -t-l
i 10
ir.t jrons;2s
@t @t
NEMARATINGFORENCLOSURES for controlequipment. standardsof enclosureconstruction haveestablished NEMAand otherorganizations reasons: following of the or more one for enclosed general, be would In equipment L 2, 3.
Preventaccidentalcontactwith live parts. conditions' Proteclthe controlfrom harmfulenvironmental Preventexplosionor fireswhictrmightresultftom fre electricalarc causedby the control.
numbersare: per NEMAclassification Commontypesof enclosures NEMAI.GENERALPURPOSE The general purposeenclosureis intendedprimarilyto preventaccidentalcontactwiththe enclosed indoorswhereit is notexposedto unusualservice apparatus.lt'is iuitabtefor generalpurposeapplications but is not againstdustandlightindirectsplashing, cirnOitions. A NEMAI encloiureservesas protection dusttight. NEMA3. DUSTTIGHT, RAINTIGHT againstspecifiedweatherhazards.A NEMA3 This enclosureis intendedto providesuitableprotection work,andfor docks, canaland construction on ship outdoors, enclosureis sui+rable for applibtion applicationin subwaysand tunnels.lt is alsosleet-resistant. NEMA 3R. RAINPROOF, SLEETRESISTANT
This enclosureprotectsagainstinterferencein operationof the containedequipmentdue to rain,and resists damagefrom exposuretdsbet. lt is designedwith conduilhubsand extemalmounting,as well as drainage provisions. NEi,IA4.WATERTIGHT "Enclosuresshall A watertightenclosureis designedto meet the hosetest describedin the followingnote: and shalldeliver at used be tested'bysubjectionto a streamof water.A hosewith a one inctrnode shallbe of not less than 10 distance ftom a on the enclosure be directed per water shall gilons The minute. least 65 or more directionsas feet and ior a pehoOof five minutes.Duringthis periodlt may be djrectedin any_o-ne desired.Therdshall be no leakageof water intothe enclosureunderthese conditions.' for applicationsoutdoorson shipdocksand in dairies,breureries,etc. A NEMA 4 enclosureis suitrable CORROSION.RESISTANT NEMA 4X . WATERTIGHT, These enclosuresare generallyconstructedalongthe linesof NEMA4 enclosuresexceptthey are made of a materialthat's highlf resistai'rtto corrosion.For this reason,they are idealin applicationssucfi as pap€r ordinarilydestoy a steel mills, meat pacrung,tertllizerand cfiemicalplantswhere contaminantsrr'rould period of Ume. enclosureovera NEMA 7 . HAZARDOUSLOCATIONS. CLASSI These endosuresare designedto meetthe applicationrequirementsof the NationalElectricalCodefor ClassI ha'ardouslocationi.ln thistype of equipment,the circuitintemlptionoccursin air. "Class I locationsare thosein whichflammablegasesor vaPorcare or may be presentin the air in quantitiessufftcientto produceexplosiveor Qnhbblemixtures.' NEIIIA9 HAZARDOUSLOCATIONS- CI-ASSII These enclosuresare designedto meet the applicationrequirementsof the NationalElectricalCodefor Classll hazardouslocations. "Class ll locationsare thosewhichare hazardousbecauseof the presenceof combustibledust." The letteror lettersfollowingthe typenumberindicatesthe particulargroupor grgupsof hazardouslocations is (as definedin the NationalElectri6itCode)for whichthe enclosureis designed.The designation incompletewithouta Euffx letteror letters. NEMA12.INDUSTRIAL USE whereit is desiredto excludesuchmaterials The NEMA 12 enclosureis designedfor use in thoseindustries as dust, lint,fibersandf,yings,ol see pageor coolantsee page.Thereare no conduitopeningsor knockouts in the enclosure,and mountingis by meansof flangesor mountingfeet. NEMA I3. OILTIGI'TT. DUSTNGHT NEMA 13 enclosuresare generallyof cast construction,gasketedto permiluse in the same environments as NEMA 12 devices.ThJessentialdifferenceis that,due to its casthousing,a conduitenty is providedas an integralpartof the NEMA13 endosure,and mountingis by meansof blindholes,ratherthanmounting brackets.
Electrician Practice Test 1
1.
In Class1, Division 7 locations,conduit sealshall beplaced a maximum of inchesJrom an enclosureslor arc producing devices.
r(' r c'
?
{12 b) t8 c124 d) 30
What length is requiredfor thepullbox in the diagram below?The box is usedwith 480 volt conductors. t
ay 32 inches
l
D24 inches c; 48 inches
!
r
d) anYlength
Pull Box fror uncjer600 voh circuit conductors hlo.4 and lcr.rQer
*
Lenerth->
'?
Whutis the load that can beusedfor the semicecalculationlor o dwelling unit whenthe Range hasa nameploterating of 13 KV? r r ? t-
/
5.
a;13kw b) 8'4hr/ c;8ha" d) none ofthe above
What size equipmentgrounding conductoris requiredfor a circuit protectedwith a 50 amperecircuit breaker? l^
a) No' 12 coPPer
'
b) No' 1o coPPer
t*
c) No' 8 coPPer
What is the highest voltagefor a ClassI power limited circuit? r
a; 1'000volts
(^
b; 3o volts
.
c1 24 volts
r
d) None of the above
6.
What is the missingvoltagein the sketchbelow?
r
a; 120volts
C
U; 120volt's
('
c1 1200volts d; 12,000volts
120votts 100Turns
7.
is Vottage 1,000Turns
Wtat sizeRigidMetal conduit is permittedfor thefollowing 9 conductors? 4 THVN #1, CU, 2 RHll/ (covered)#8 CIl, 3 RHW (covered)#6 Ca {
a1 1 1/2inch
(-
U; 1 1/4inch
a
e
1 Il2 inch and 1 1/4 inch
d) Noneof the above
8.
lV'hatis the el/iciency of a motor which draws4,5 kilowattsfrom the line and delivers5 horsePower? r
a) 80 Percent
c
5;83 Percent
(-
c) 90 Percent
9,
Power Factor con be defined as: r ' '
n ''t t"
Lt Lf '
a) True Powerdivided by ApparentPower. by ApparentPowerdivided by True Power s1 AppatentPowerdivided by volts x amperes
What is the powerfactorfor a three phase systemoperating when the wafirneterreads 6,000 watts,the voltneter reads 208 volts, and the ammeter reads20 amperes? c
a) .90or 90 Percent
r
u; 1.0+or 104Percent
('
c) .83 or 83 percent
Mtat is the powerfactor of a 8000 watt load connectedto a 240 volt AC single-phasecircuit if the current is 36 amperes? c
a) '8 or 80 Percent
c
b) .93or 93 Percent
r
c; 1.0or 100Percent
l
!
.
t ). '-'
For theJigure below tf No. I or larger conductorsare installed in the minimwn The box is rcedlor racewaysdimensionX shall be_inches inch dimensiotts marked on iL the cubic have splicesand doenot a) 18inches C
b) 16inches e 24 inches
-.4
73, For the 4-wal Switch,whichis the correcthookup? r c c
a ; D t o T ,E t o & F t o T , G t os b ; D t o S , E t o & F t o T ,G t o W c ; D t o R , E t o T ,F t o s , G t o w
To4-WaySw
4imys'rvfuh
t i
( : l
, ,t r-ic
A dwelline hasa floor areaof 2200sq. ft., exclusiveof an unfnished ceilar not adaptallefor future use,unlinishedattic, andopenporches.Appliances are a lj-kW rangeand a 5.5-kW, 240-V dryer. Assumerzmgeanddryer kW ratingsequivalentto kVA ratingsin accordancewith Sections220'18 and 2z}-lg.ComputedLoad [seeSection220-101 Fill in the following information: GeneralLighting Load: Minimum
: -.i
sq. ft. at -
VA per sq. ft. =
VA
Numberof BranchCircuits Required: VAI l20V:-A GeneralLigbtingLoad: YA I 120V : - A GeneralLighting Load: 20-A,2-wire circuits orThiJrequires_ 15-A 2-wire circuits 20-A 2-wire, SmallApplianceLoad: LaundryLoad :One2-wire, 20'A circuit one additionalbathroom20 amperecircuit is alsorequired. Minimum SizeFeederRequired: VA GeneralLigbting VA SmallAppliance VA Laundry
VA Total11100 VA at 100%3000VA VA - 3000VA =
VA at
o/ois
VA VA Net LoadVA RangeVA DryerVA Load Computed Net serviceor Net ComputedLoad for 1201240-V,3-wire, single-phase feeder
yAl240V=_A
Net computedload exceeds10 kVA. Would requireservice A. conductorsto be Calculationfor Neutral for Feederand Service: VA Ligbtingand SmallApplianceNet Load VA at 70Yois 5600VA Ranee: VA at 70% is Dryeri - VA VA Total ComputedLoad for Neutral: A VA/240V=
Whatis thetinal computedloadfor the neutralin the aboveload calculation? r
a165'9
r
b) 63'7 c1 loo
r r
d)111
15. Thecorrec'thookupfor the 3-woyswilchbelowis: r r r r
a 1A t o X , B t o z , c t o Y b;AtoY,Btox.ctoz c)AtoZ,BtoY,CtoX d;AtoZ,BtoX,CtoY
SUPPLY
&iiay s'sribh
To4-waySwitch
16.
Connectthe delta wound 480vott motor leadsfor the high voltagewindings in the diagran below. (*
a7
g_7,4-6,9-9,54
r'
b) 4_7,5-9,6-9
c
c; 4-9, 6'8,5'7
77,
Find the correct size ventilated cable troyfor the diagram below. {^
a; 6 inches
r
b) 12 incbes
r
c) 18 inches
'
d)24 inches
Gr,sr 4/€ rElultloon4nctot Eacfi cabl,e la eeblea g incfi es iar dierns er
Und'f, cables. r incn
I \
\ \
\
\
drra rnultiaon€tucto" ;s E.=ctr +s{'e in ,risrraer
l l
the voltageacrossthe 5 ampereload afier the neutral is opened Botlt 1 8 .Find loads are resistiveand thepowerfactor is 1.0. (-
a; 180volts
c
b1 120volts
'
c; 0 volts
24O v.ah J 129 v€{:l 3€rvi€.
O Find the sizeof invercetime circuit breakerrequiredfor thefeeder r, '/t Thesemotors are protecting 'Design theJoltowing polyphase induction moton. B and-havea S-erviiiFactor of 1.15 and are individually protected with inverse time circuit breakers. c
a; 150amPere
r-
b) 175ampere
r
c; 200 ampere
q:J
I I I
many cubic inchesis requiredfor thefollowing box?AII conductors 20. How are No, 11 and there are no iiternal clamps, r
{
Qcubic inches
(^
b) 16 cubicinches
(-
c) 18 cubic inches
'
d) 20 cubic inches
ElectricianPracticeTest L A}[SWBRES
:
#l b (18) Conduitsealsshallbe installedwithin 18 in. from the enclostue.Only explosionproof unions'couplings,reducers, elbows,cappeaelbbws,andconduitbodiessuch&sL, T, andX typesnot largerthan the fiade size of the conduit arepermitted section501-5(a)(1) ut.t seal.Text Reference #2 a (32 inches) tn sfraightpulls, the lengthof the box shallnot be lesi than eighttimesthe tradediaureterof the largestraceway' Text Referencesection 370'28(aX1) #3 b (8.41n,) 8 kw + 5 percentof 8 kw is 8'4 kw' Text Referencesectiontable220-19Note 1
listsaNo. 10copperfor a 50 #4 b CIo. 10copper)Table250-122 section250'L22 amperecircuitbreaker.TextReference #5 b (30volts)class1 powerlimitedcircuitsshallbesupplied from a sourceihathasLratedoutputof notmorethan30 voltsand n 725-21(a) sectio TextReference 1000 volt-amperes. #6 c (1200volts) l20A/oltage:100/1000; voltage= (120x 1000)/ 100,voltage: 1200volts sectionBasicElectricalTheory TextReference
#7 c (l % inch & | y4 inch) Problem: What sizeRigid Metal conduitis permittedfor the following 9 conductors? + nrw}I #12 cIJ,2 RI{W (covered)#8 cu, 3 RITW(covered)#6 cu From Table5: Area of #12TIIV/N is .0.133x 4 = .0532 Area of # 8 RI{W covered= .0835x2: .167 Area of #5 RHW covered= .1041x 3 = .3123 Total area: .5325sq.inches tn Table4 for RigrdMetal Conduitfind the first numberlargerthan.5325that is 0.610in columnfor over2 wires 40%to L ll4 inch conduit. This corresponds A I I/2 inch conduitwould alsosatisff the requirement. Answer: C both I l/4 and 1 l/2 nch conduitscanbe used.
Text ReferencesectionChapter9 Table l, Table4, & Table 5
#8 b (83 percent)efficiency: (5 x 746watts)/ 4,500watts Basic ElectricalTheoryin aNutsheLlSeeHandout
Text ReferencesectionBasicElectricalTheory #9 a (TruePowerdividedby ApparentPower)True Power: watts, ApparentpoweFvolt-amperes.PF : watts/volt amperes Text ReferencesectionBasicElectricalTheory PF = 6,000I (208*20*1.732) #10 c (83 or 83 percent) Text ReferencesectionBasicElectricalTheory #11 b(.93or 93 percent)PF:8,000I (240voltsx 36 amperes) Text ReferencesectionBasicElectricalTheory #12 c (24 inches)Uselargerof (6 x 3) + 3 +3 : 24 inchesor (6 x . i m e n s i o n X s h a l l b e 2i n4c h e s . 2 ) + 2 + l + 1 : 1 6 i n c h e sD Text Referencesection 370'28(aX2) # 1 3 b ( D t o S ,E t o R , F t o T , G t o W
#14 b (63.7) Thisproblemis alnost identicalto ExampleD1(a)in Appendix
t
D of the 1999 Code. This dwelling hasa floor arcaof 2200sq. ft., exclusiveof an rrnfinishedcellarnot adaptablefor future use,unfinishedattic, and openporches. Appliancesarea 12-kW rangeand a 5.5-kW, 240-V dryer.Assune rangeand dryer kW ratings equivalentto kVA ratingsin accordancewith Sections220-18aad220' 1g.ComputedLoad [seeSection220-l0l GeneralLighting Load: 2200 sq. ft. at 3 VA per sq. ft. = 6600VA Minimum Number of BranchCircuits Required GeneralLigbtingLoad:5600VA / l20V: 55 A [seeSection210-11(e)(1)] This requiresfor:r l5-A 2-wire or three20-A" 2-wire circuits SmallApplianceLoad:Two 2-wire,20-A circuits[seeSection210-11(cX1)] Lar:ndryLoad:One2-wbe,20-Acircuit [seeSection210-11(c)(2)] BatlrroomBranchCircuit: One 2-wire,20-A circuit (no additionalload calculationis requiredfor this circuit) [seeSection210-11(cX3)] Minimum SizeFeederRequired[seeSection220-10] GeneralLighting 6600VA SmallAppliance3000VA Laundry 1500VA T o t a l1 1 1 0 0V A 3000VA at 100%3000VA is 2835VA I I 1 0 0V A - 3 0 0 0V A : 8 1 0 0V A at35Yo Net Load 5835VA Range(seeTable220-19)8000VA Dryer (seeTable220-18)5500VA Net ComputedLoad 19,335VA serviceor feeder 3-wire,single-phase Net ComputedLoad for 1201240-V, = 1 9 , 3 3 5V A ,2 4 0V 8 0 .6A Net computedload exceeds10 kVA. Section230-42@)would requireserviceconductors to be 100 A. Calculationfor Neutal for Feederand Service Lighting and SmallAppliance Net Load 5835VA Range:8000VA at70%o (seeSection220-22)5600VA Dryer : 5500YA at70% (seeSection220-22)3850VA Total 14,550VA ComputedLoad for Neutral
sectionAppendixD, 1s,28s v A I z4oy= 63:e Text Reference exampleD1(a)
#15 c (A to Z, B to Y, C to X) SeeDiagam
&vay svribh
To 4-waySwitch
sectionBasicElectrical #16 b (4-7,5-8,6-9) TextReference Theory SeeDiagrarn
!
#17b ( l2_tqshes Over 4/o multlconductor cables. Each cable ls 2 Inches In dlameter
section318-9(a)(2)andTable 318-9 Text Reference ; f o r 5 a l o a d: 1 2 0 1 5 # 1 8 a ( 0 v o l t s ) R f o r 1 5a l o a d: 1 2 0 1 1 5 : 8 o h m sR : 24 Neutralopenl: 240/(8 + 241: 7.5 a; E across5 a load:7 .5 ax 24 -180volts seediagram
NeLJtrao l r grounded conductor
Solution Problem:Find the voltageacrossthe 5 ampereloadafterthe neutralis opened. of eachload: First find theresistance l5 ampereload: Volts: 120 R:E/I R: 120 volts/ l5 amperes R: 8 ohms 5 ampereload: R: 120volts/ 5 amperes R:24 ohms is 8 + 24 or 32 ohms' When neutralis openthe two resistorsarein seriesandthe TotalResistance The voltage is240 volts acrossthetwo resistorsin series. To find the curent after the neutralopens: I= 24Qvolts/ 32 ohms [ = 7.5 urmperes of 24 ohmsis: The voltageacrossthe 5 ampereloadthathasa resistance E=lxR E = 7.5 amperex 24 ohms E : 180volts Answer: 180vols
#19 b (175amDere) seedi .'^.
Problem: Find the sizeof inverserime circuit breakerrequiredfor the feederprotecting the following polyphaseinduction motors. ThesemotorsareDesignB and havea ServiceFactorof I .15 and areindividually protectedwith inversetime circuit breakers. This is a motor feeder circuit. There is a motor feederExample D8 in Appendix D of the Code. Motor Circuit Conductors,OverloadProtection,and Short-Circuitand Ground-Fault Protection (seeSections240-6,430-6,430-22,430-23,430-24, 430-32,430-34,430'52,and43042, Tables430-150and430-152) FeederShort-Circuitand Gror:nd-FaultProtection The rating of the feederprotectivedeviceis basedon the largestbranch-circuitprotective deviceplus the sum of the full-load currentsof the othermotors [seeSections240-6 and a30-62(a)l For the 5-hpmotor FLA is 7.6 'mperesfrom Table430-150. from Table430-150. For the 15-hpmotor FLA is 21 arnperes from Table430-150. For the 40-hpmotor FLA is J) ernpercs 52 x 1.25=65 amperes 65 + 2l + 7.6= 93.6arnperes The branchcircuit protectivedevicefor the 40 hp motor is basedon Table 430-152is 250 percenttimes 52: 130amperes.By Section240-6the next larger standardsizeCB is 150amperes. Then for the feederCircuitBreaker: 150+ 2l + 7.6 = 178amperes. The neareststandardfusethat doesnot exceedthis value is 175A [seeSections240-6 and430-62(a)1. Answer 175ampereCircuit Breaker.
#20 b (16 cubicinches)seedi
Problem:How manycubic inchesis requiredfor the following box?All conductorsareNo. 14 andthereareno intemalclamps' ConductorCountSwitch :2 '
. '
Gror:ndingconductors:1 Conductorsthat originate outsidethe box and terminateor are spliced in the box:5 Total:8
;
't -i
The cubic inch arearequiredby Table 370-16(b)for a No. 14 is 2 cubic inches. The cubic inch capacityrequired is 2 cubic inchesx 8 or 16 cubic inches.
:
") i
..
Answeris 16cubicinches.
Reference: (b) Box Fill Calculations.The volumes in paragraphs(1) through (5), as applicable, shall be addedtogether.No allowance shall be required for small fittings such as locknuts and bushiirgs. (1) Conductor Fill. Each conductorthat originates outsidethe box and terminates or is spliced within the box shall be countedonce, and each conductor that passesthrough the box without splice or termination shall be counted once.The conductor fill, in cubic inches,shall be computedusing Table 370-16(b). A conductor,no part of which leavesthe box, shall not be counted. Exception: A:r equipment grounding conductor or conductorsor not over four fixnue wires smaller than No. 1.4,or botb shall be permitted to be omitted from the calculationswhere they enter a box from a domed fixture or similar canopy and terminate within that box. (2) Clamp Fill. Where one or more internal cable clamps,whettrerfactory or fietd supplied, are presentin the bo6 a single volume allowancein accordance with Table 370-16(b)shall be madebasedon the largestconductorpresentin the box. No allowance shall be required for a cable connectorwith its clamping mechanism outsidethe box. (3) Support Fittings Fitl. Where one or more fxhrre studsor hickeys are present in the bo>r,a singlevolume allowancein accordancewith Table370-16(b)shall be made for eachtype of fitting basedon the largestconductorpresentin the box. (4) Device or EquipmentFill. For eachyoke or strapcontainingone or more devices or equipment,a double volume allowance in accordancewith Table 370-16(b) shall be made for eachyoke or strapbasedon the largestconductor connectedto a device(s)or equipmentsupportedby that yoke or strap. (5) Equipment Grounding ConductorFill. Where one or more equipment grounding conductorsor equipmentbondingjr.mpers entersa box, a single volume allowancein accordancewith Table 370-16(b)shall be madebasedon the largest equipmentgrounding conductor or equipmentbondingjumper present in the box. Where an additional set of equipmentgrotrndingconductors, as permitted by Section 250-L46(d),is presentin the box, an additional volume allowance shall be made basedon the largestequipmentgrounding conductor
in the additional set.Text Referencesection370-16;Table 370-16(b)
ElectricianPracticeTest 2
I.
In the diagram belowthe total resistanceis
(-
r
la
a)
20,10.7ohms
b)
20,19.7ohms
c)
20,20.7ohms
d)
1 0 ,3 0o h ms 1 0o h m s
120volts
and the value of R3 is
I = 6 am per es
20 ohms
I '^"Tl
R2 10ohms
Rt= e) itoialreslslanc
-')
Wat is the ampacityof 12 No.12 THHN copperconductorsin a I0feet long EMT racewaywherethere are 9 current carrying conductorsand the ambient temperatureis 42 degreeC? (Selectnearestanswer) f
((-
a)
10 amperes
b)
15 amperes
c)
i 8 amperes
d)
22 amperes
2 ro
lVhat is the allowable ampacity of each No. 6 THW copper conductor if there are l0 current carrying conductorsin a 21 inch long rigid conduit nipple in a room where the antbient temperature is 55 degreesC? (Selectnearest answer) r r (^ r
a)
65 amPeres
b)
$J amPeres
c)
50 amPeres
O
44 amperes
/ Find the sizeEMT nipple required to enclose3 each 500 kcmil THHN 'rr conductorsbethteenwo Panekc r r '
a)
1 1/2inch
b)
2 inch
c)
3irch
d)
3 1/2inch
( sizerigid steel conduit is requiredfor 1 each 4/0 XHHV/ and I each cro What No. 3 bare iquipment grounding conductorif the racewayis 12feet long? c r(. ('
a)
I ll2 inch
b)
2 inch
c)
2 ll2 inch
d)
3 inch
e)
1 inch
6. Junction boxesshall be
'
. C '.
(r (-
a)
accessible
b)
readily accessible
.;
visible
d)
insideremovablePanels
. i required in a branch circuit in scess of The type of ' lampholder '. /' ,ioi6, n
c l('
g.
a)
brass
b)
Porcelaincoated
c)
not an interchangeabletYPe
d)
heavYdutY
20 amPeres
Ilnlessan ucepted load as speciJiedby the Code,a 56 ampereload shall be protectedbYa -fuse. tr r* (-
a)
50
b)
60
c)
70
d)
80
a washdownarea a metollic rucewoyshall be spacEdnot lessthan "O fn inchfrom the walls.
LI n v'
r
a) ll8
c
b) ll4
(-
c) l/2
c
d) 314
Given: Three (3) 500 kcmil Type THHN copper conductort in a raceway at 70 degreesC. The maximum allowable current in each conductor b amPefes.
r' t
r' 1
^t fI
a)
249
b)
409
c)
430
d)
705
Alixture that weighsmore than -pounds independenttyof the outlet bon ra)
40
r
b) cc)
50
rd)
70
60
shall be supported
7 2.
An AC-DC general usesnap switch may be usedwilh inductive loads at of its amPererating at the applied voltage' -percent c
, 2 t "'
a) c b )
40
ec)
70
(-
80
Whenutilized as ou&ide bronch circuib andfeeden, overheadconductott not be lessthan fo, 600 voltsor less,for spansup to 50feet, shall copper. (c r r*
t/ rq'
d)
5 0
a)
No. 14
b)
No' 12
c)
No' 10
O
No.g
Conductorcof light and power systemsof 600 voltsor lessmay occupytlte ioit enclosire, without regard to whetherthe individual circuitsare AC or DC, only whereall the conductorsare-' c ,,^ ' r'
c)
insulatedfor the ma:cimumtemperaturewithin the enclosure. insulatedfor the maximumvoltageof any conductorwithin the enclosure insulatedfor the maximumof 300voits
d)
noneof the above
a) b)
excePtions,conducton < When utilized in overhead services,without any tI Jo coPper' shaltnot be smaller than No.
7A ru'
ra )
1 4
c
b) r c )
12
.-o
8
1 0
not to uceed MAde electrodesmust have a resistanceto ground ohms when usedalone c
a)
c
5 10
b) {-c)
25
{-
30
d)
of all all exceptions,the sum of the cross-sectionalarea . . Disregarding n:i*ay sh'allnot *cied interior rt 7 the of percent conductorsi"-i cross-sectionalarea of the wireway' c
a) ' b )
20
rc)
40
r
60
d)
3 0
(9 )N o .!A V G.THHNcopper conductor sinaconduitat30 v'G i ve n :N i n e Wltat 4t R is the maximum atloiitte ampacig in each conductor? degreesC. C
c r* a
Lt "O
33'3
b)
38's
c)
40'0
d) ss
supply an air conditioning The minimum total circuit ampacityreeuyl!lo power at a unit which-corro rs 81500volt amperesof mobr compressor linevoltageof2l0voltsisamPeres.Selecttheclosestanswer. f {.
e
v' -) n
a)
a)
44.3
b)
40.0
c)
35.4
d)
28.3
tjshtins load of 50'000 Given:An ollice building.ttas.arequired.general a singlephase' 230 supptiedby volt amper"i. Tt , general tighting'toad i d-iurrent in thefeeder circuit volt feeder circuitThe minimum calculate amperes.select the closestanEwer' ungroundeo'i*i conductorsrs_ C (^ C
c
a)
208
b)
217
c)
227
d)
230
o TOTAI RESISTAIICE: TOTAL VOLTAGE TOTAI A]VTPERES of n resistorsin parallelis foundusingthe formula: o Resistance l/RT = liRl + 1lF.2+ 1/R3.....+1lRn of two resistorin parallelis foundr:singthe product o Resistance over the sumformula: RT= (R1 x R2)/(R1+R2) of n resistorsin seriesis foundusingthe formula: o Resistance RT = Rl + R2 + R3 ......+Rn Using the aboventles: Rt: 120voltsi 6 amperes Rt = 20 ohms The resistanceof Rl, R2, andR3 in parallelis Rt minus 10 ohmsminus 5 ohms or 5 ohms. The resistance of Rl andR2 in parallelis (10 x 20) / (10 + 20) or 6,7 ohms. T h e n 5 o h m s = ( 6 .x7R 3 ) l ( 6 . 7+ R 3 ) 5 ( 6 , 7+ R 3 ) = 6 . 7x R 3 33.5+5R3=6.7xR3 6.7R3- 5R3=33.5 R3 (6.7- 5) = 33.5 R3 = 33.5I 1.7 R3 = 19.7ohms
#2 c (18 amperes)The deratingfactor for 9 c1tlrentcarrying conductorsin a racewayis 70 percent,andthe ambientderating factor for 42 degreesC. is .87.Ampacity of THHN No. 12 is 30 amperes.,7 x.87 x 30 : L8.27Elmperes. section310-15(b)table310-16andcoffection TextReference factorsat bottomof tableandTable3 10-15(bx2)(a) #3 d (44 amperes)THW ampacityis 65 amperes.The ambient Text Reference deratingfactoris .67 .67 x 65 : 43.55uunperes section310-I 6 andconectionfactorsat bottomof table #4 b (2 inch)The areafor 3 -500 kcmil THHN conductorsis 3 x .7073-2.1219 For 60 percentfilI usingthe.8 roundoffmethod requiresa 2 inchEMT. Text Referencesection348-8;Chapter9, table 1 notes4 and7, Table4, andTable5 #5 b (2 inch)Areaof 4 410: 4 x .3197:1.2788; arcaof No. 3 is .053. 1.2788+ .053: 1.3318sq.in. requiringa2 inchrigid conduitwith a 40 percentareaof 1.363sq.in. Text Reference 9 TableI,4,5, and8 section346-7;Chapter Conduitbodies,junction,pull, andoutletboxes #6 a (accessible) shall be installedso that the wiring containedin themcanbe Text Referencesection370'29 renderedaccessible #7 d (heavyduty) Whereconnectedto a branchcircuit havinga rating in excessof 20 amperes,lampholdersshallbe of the healysection210-21(a) duty type.Text Reference #8 b (60) The next largersizepermittedby Codeis 60 amperes. Text Reference section 240-3(0; 2a0-6(a) practiceis to keepelectricalequipmentll4 #g b (Il4) Standard inch of the surfacein indoorlocationsthat may becomewet. Text Reference section300-(6)
the deratingfactorfor 70 #10 a (249)By Table310-16(bottom) degrees C in the90 degreeC. columnis .58. .58x 430A. :249 amperes.Text Referencesection310-16andderatingtableat bottomof page #11 b (50) A fixture that weighsmore than 50 lb (22.7kg) shall be supportedindependentof the outlet box unlessthe outlet box is listed for the weight to be supported. section410-16(a) Text Reference snapswitch suitablefor useon #l2b (50) A form of general-use either ac or dc circuitsfor controllingInductiveloadsnot exceeding50 percentof the ampererating of the switch.vw Text Referencesection380-174(b)(2) #I3 c (#10) Openindividualconductorsshallnot be smallerthan the following: For 600 volts,nominal,or less,No. 10 copperor No. 8 aluminumfor spansup to 50 ft (15.2m) in lengthandNo. 8 copperor No. 6 aluminumfor a longersPffi,unlesssupported. Text Reference section225-(a)(l) #t4 b (insulatedfor the ma:
: .,.
' :
.j ! ' u:r
.
areasof all contained # I7 a (20) The sumof cross-sectional conductorsat any crosssectionof the wirewayshallnot exceed20 areaof the wireway. percentof the interior cross-sectional the deratingfactorfor 9 #18 b (38.5)By Table310-15(bX2) conductorsin atacewayis 70Yo..70x 55 = 38.5amperes. sectionTable310-16;Table310-15(bX2)(a) TextReference #Ig a(44.3)I: plE:8500 VN 240volts- 35.4amperes.Frorn Table 440-32125pet centof 35.4: 44.3amperes' #20 a(208)I - P / E; 50,000I 240volts:208 Etmperes. sectionAppendixD Text Reference
Electrician Practice Test 3 a,, i a vuJ-4
hi,rm'rrar. l\ultuJsl.
3
NO.
FI Given:Three (3) 500kcmit THHN conductorsin a racewayat 70degrees t'o H/hatis the maximum ollowablecurrent k each conductorif the terminations and equipment is rated at 90 Degtees C? ((C C
a)
345
b)
380
c)
430
d)
447
ucept -2. F-texibtecord muy be used in oll of thefollowing locations
J'?
4,
r a )
hoists
{-
b) r c )
cranes
r d )
pendants
to replacepermanentwiring
Wen a conduit nippte having a maximum lengtft not to exceed24 inchesis of its total installed,the nippii shall bepermined tu beJilled to -percent crosssectionalarea ca )
3 0
c b )
40
r c )
50
c d )
60
Drumsof gasolinemay be storedin what type of outdoorarea?
t
a)
Anywhere
I
b)
ClassIII, Division2
c)
ClassII, Division I
d)
Unclassifiedareasat a buik storageplants
r f
5.
The interior of paint spray bootlts ore considered c a )
Class1, or Class2, Division I
r b )
Class1, Division 2
(-
ClassII, Division I
c) c d )
6.
7.
ClassII, Division 2
The maximum allowablefiAfor conduit and tubkgfor 3 or more conductors, not lead coveredis
c a )
30%
r b )
40%
r c )
50o/o
c d )
60%
In a conduit seal, the minimum thicknessotthe seoling compound,except where rced in cables, should in no case be le5,sthan (-
a)
ll4u
r b )
l/2"
('
518'
c)
r-
8.
3/4u d) Given:A 30 hpr 3-phase,160volt, continuous duty induction motor with a sembefactor of 1.15 and a temperaturerise of 40 degreesC. The maximum amperes. rating otthe required separateoverload device is_ '-a)
46
r b )
50
c c )
56
r d )
60
o 7o
Given:Measurement acrossa 3-phasesquirrel cagemotor atfull load are 460 voltsand 65 amperes.What should the honepower rating be rcing the Code?
ca)
30
r
b)
40
c)
50
r r
Lt n v'
60 d) Referto theligure below.Giventhe circuitshown Whatis thecurrentin the neutral conductor?
r a )
25.0amperes
c b )
12.5a.naperes
. c )
6.25amperes
r d )
4.2 amperes
1 ,OOO \A/atts N e utral 5oo
\A/a.tts
I
|
'' l'
::=:: ::::= =:
12O ===::::=:
vA(::::
be at least
ll :::
Given:A 25footfeeder tap. The ampacityof the tap must 7 7 .tha,t il is which protectionfrom overcunent or conductor of thefieder tapped (
a
t^
a)
u4
b)
U3
c)
u2 a tA
d)
Jtn
-l l'
) '-t a'
The normal current allowed on a coyiperbw in an Awiliary Gutters is amperesper squsrc inch. The nuntber of ampereswhich a 2 1/2 x 1/4 11000 amPercs. inch square copper bus may carry under thse conditions itc a )
r r
b)
750
c)
l,'000
c
t'250 d) hasa total lengthof 500feetandsuppliesd zt r?' Given:A 240 volt conductor of 1.15ohmsper 1'000 bad of 10 arqperes.Theconductorhasa resistance feel The total wltage drop in the conductor circuil conducton is percent Select the closest answen /-
|/ 'Tc
a) c b )
J
r c )
7
r
n
f
d)
The maximumftxture weight that may be supportedby the screwsltell of a pornds. hmpholder is
r a )
)
c b )
6
r c )
10
t'
16 r\r
d)
a cable is installed through bored holes in woodioists, where 7 5 . Where possible,the hoks shall be bored so that the edge of the hole is not lessthan
inch(es)from the nearestedgeof the woodmember.
r a )
I
r b )
Lv4
r c )
LU2
r d )
2
(only) of a volt-
The minimum lighting toad requiredfor the general Eghting 76. church huitding having ou&ide dimensionsof 100t by 200' is amPefes.
: -.:
c a )
2,000
r b )
4,000
c c )
20,000
r d )
40,000
size copper equipment grounding conductfor grounding rt 7 / ' The minimum equipmcnt hmting a 10 ampere automatic overcurrent devicein the circuit aheadof the equiPmentisNa
r
p rI 'r'
^)
6
r b )
8
r c )
10
r d )
12
Given:A 240 volt, 20 amPeretwo wire branch circuil If the ,ruEimum ailowable voltagedrop through the circuit conductorsis 2,4 volts,what is the maximum allowable resistanceof the circuit conductorc?
r a )
12ohms
(-
1 .2ohms
b) r c )
.48ohms
c d )
.12ohms
^I "O
The combined load oif two, 230 voltftxzd heaters on a 30 antlrerebranch kilowot&, Select the closestdnsreen circuit shalt not qceed ('
2.4
r b )
).)
(-
c)
5.9
d)
24.0
(^
)n -v'
a)
Outlet boxesmounted in combustible walls or ceilings must be mounted so the that thq will be set back not more than a msimum of -kchfrom surface. ftnished
r c. r C
a)
U2
b)
r/4
c)
1 /8
d)
0 (must be flush)
I
Electrician Practice Test 3 .-
._ I
.,
#1 d (447)the correctionfactorat the bottomof Table310-16 for 70 degreesF. is 1.04for 90 degreeratedinsulationsuchas fHHN. 1.04x 430amperes: 447amperes. derating Text ReferencesectionTable310-16& Temperature factorsat bottomof table,andsection110-14 #2 c (to replacepennanentwiring) Text Referencesection400-7, 400-8
#4 d (Unclassifiedareasat a bulk storageplants.)This permission is given for bulk storageplantsandthey aredefinedin Section 515-I . Text Referencesection575-2
-
'
4, *
d.i
No. 3
#3 d(60) Whereconduitor tubingnippleshavinga maximum lengthnot to exceed24 n. (610mm) areinstalledbetweenboxes, the nipplesshallbe pennittedto cabinets,andsimilar enclosures, axea. be filled to 60 percentof their total cross-sectional Text ReferencesectionChaptet9, Table 1 note4
"
r
Quiz Number:
shall #5 a (Classl, or Class2, Division1) The followingspaces be consideredClassI or ClassII, Division I locations,as applicable: The interiorsof sprayboothsandrooms. Text Referencesection516-2(a) TextReference #6b (40%) By Table1 in Chapter9,40 percent. sectionChapter9, TableI #7 c (5/8") In a completedseal,1[s minimumthicknessof the sealingcompoundshallnot be lessthanthe tradesizeof the sealinEfitting ond,in no case,lessthan 5/8 in. Text Reference section501-5(cX3)
#8 d (60) 125 percentof 40 is 50 amperes,but Section430'34 allows a 140percentmaximumoverload.Text Referencesection table 430-150;Sections430-32(aXl);430-34 #9 c (50) By Table 430-150a 50 horsepowermotorhasa fulI load amperesof 65. Text Referencesection430-150 #10 d (4.2 anperes)Cunentthrough1000watt load: L,000/120 -8.3 amperes;Currentthrough500watt load : 500/120= 4.L7 amperes.8.3 - 4.I -- 4.2 amperes.Text ReferencesectionBasic ElectricalTheory #11 b (Ll3) Also, the tap conductorsterminatein a singlecircuit breakeror a single setof fusesthat will limit the load to the ampacityof the tap conductorsand shallbe protected.Text Referencesection 241-2l.(bX2) #L2b (625)Amperes: (2.5x .25)x 1,000: 625amperes Text Referencesection374-6(a) .45: 7.25volts;percent #13 a (3) E:IxR; E:l0 x (500/1,000)xl -(7.251240) x 100- 3 percentText ReferencesectionBasic Electrical Theory #14 b (6) A fixture that weighsmorethan 6 lb (2.72kg) or exceeds 16 in. (406 mm) in any dimensionshallnot be supportedby the screwshellof a lampholder.Text Referencesection4L0-15(a) #15 b (I %) If this requirementcannotbe met, standard*nail plates* canbe used.Text Referencesection300-4(aX1) #16 c (2000)100'x 200' - 20,000sq.ft.,By Table220-3(a)1 VA per squarefoot is requiredfor churches.1 x 20,000:20,000 VA. Text ReferencesectionTable 220-3
a No. 10 #17 c (10)By Table250-122a40 ampereOCPDrequtues copperequipmentgroundingconductor.Text Referencesection table 250-122 '
#18 d (.12ohms)R: El I;R: 2.4120; R .12ohms. The 240 sectionreviewDC is (2.41240 )x 100= I percent.Text Reference Theory
'i,
24x230:5520 watts; +19b (5.5).8x 30 :24 €rmperes. sectiona2a-3$) 5520/1000:5.5lcw.Text Reference
-.''
#20 d(0 mustbe flush) In walls andceilingsconstuctedof wood or othercombustiblematerial,boxesshallbe flush with the finishedsurfaceor projecttherefrom Text Referencesection
.
37o-20
:
E
Electrician Practice Test 4
1. Refer to theJigure below. What is wrong with the grounding rod illwtrated? r (r f
a)
It is not 10feetlong.
b)
It requiresa gror.urdciamp
c)
It is not 30 inchesdeep
d)
Thereis nothingwrong, accordingto the Code
Service
Conductor GroundingElectrode
Soil
t
2 ft. deep
I
solidcopperrod 8 ft. longby 'll2 inchdiameter -J
) a'
Which of thefollowing is not a standardfnse or inversetime chcuit breaker size?
r a )
35 45
..c)
50
c
55 d) general, a continuous dttty motor rated at more than I horsepowershall be "'? fn percent protected by a sqarate overload daice rated at no more than of the motor nancplatefull-load current rating.
r a ) r b )
100
r c )
115
r
125 d) ,t Where direct buried conductorsor cab:lesemergefrom the ground they shall ac beprotected by enclosuresor raceways.In no caseshall the protection be inches belowJinishedgrade required to uceed -
{ v'
r a )
l2
r b )
l8
r c )
24
r d )
30
Given: Three resistorc(R1, H, and R3) are instuAedin a seriescircuit The power usedby.R/ ts 100 watts and the power usedby M is 75 watts.The total power usedby the circuit is 225 wat6. Then thepower usedby resbtor RJ it r4tatts,
r r a (-
a)
24
b)
50
c) d)
175
to thefigure below.The total rcsbtanceRt is 6. Refer closestanswen
c a )
9.4
r b )
10.5
r c )
15
r d )
40
ohms. Sekct the
PE 15ohrns
r7t
Given:Afree standing electric range b rated n0n40 voltsand requiresa neutral connectionfor the 120 vott timer and lights. The range is equipped witlt 3 wire cord with No. 8 coppercondaclorsond a 3 prone plugfor two hot leadsand neutraL The rangeframe shall bepermitted to be-'
r a )
grogndedby running a groundfrom the rangeframeto the outlet box, wrappingthe groundaroundthe cord andthen groundingit to the outlet box.
..b)
ungrounded
c c ) (-
d)
groundedby a 4-wire cord containingthe two hot leads,the neutral,and a greengroundingconductor.(the rangerequiresa 4wire cord) groundedat the rangeby bondingthe groundedconductorto the ftrngefrarne.
9.
The Code requires at leasttwo stnall appliance branch circuibfor dwellings, Thesesmall appliance circuib shall be assigneda load of volt-ampereseach when calculatingfeeden and service entrance
requiremen&.
I0.
| 1| 1'
r a )
750
r b )
1000
c c )
I 500
f*
2000
d)
receptaclesmay be connectedto the small appliance T:"*^*{*efollowing
r a )
receptaclesfor electric clocks in the kitchen
.-b)
garageceiling receptaclesfor garagedoor openers
(-
hallway which are closeto the kitchen
c)
A metal underground waterpipe in direct contact with the earthfor at least il feet hastraditionally be:ena preferred groanding electrode For all new construction, a metal underground waler pipe is -.
c a ) r b ) .^c)
no longeracceptedas a groundingelechode
acceptedasthe only groundingelectrodewhen buried at least three(3)feet below the surface. inches of a recessed Thermal insulation shall not be installed within figMfirture enclosure unlessthe recessedligfutirture is identiJiedas suitablefor dbect contact with insulatiort (-
Lt -'2
still the preferredgroundingelectrode,by itself, when available. still an acceptablegroundingelechode,but it must be by at leastone additionalgroundingelectrode. supplemented
c
d)
^)
2
(-
b) r c )
4
r d )
5
I
t ?
t J a
:
The No.12 or 11 groundedconductorof a bronch circuit shall be identifrcd w,re. Dva
a)
white or gxaycolor or threecontinuouswhite stripeson other than greeninsulation
c b )
greencolor or barecopper
r
yellow color
c)
r d )
zt I"
blackcolor The CodedeJinesttcontinuousloadtt as o load wherethe maximum current is upected to continuefor at least-,
r a )
one hour or more
r b )
two hoursor more
l-
tfueehoursor more
c)
r d ) tt '"<
twenty four hours a daY
For calculating the me,imum nwnber of conduclors allowed in an outlet cubic inches. box the volumerequiredfor each No. 12 conductorit-
c a )
2
r b )
2.25
i
.
c) ' d )
2.5 3
Outlet boxesmountedin non
I
r
a)
1/8
b)
1t4
c)
u2
d)
Jt+
' ' ''t Z
Screr*shell lamphoWersshall be wired so thgt ttle connectedto the scret+t-shell c a )
grounding
r b )
grounded
r c )
ungrounded
'-d)
bare
condtrctoris
overcurrent devicesin damp or wet locations shall be 78.Enclosuresfor inch alr spacebetweenthe wall or other mauinUdso there is at leastsupport surface. r a )
1 /8
c b )
Ll4
c c )
3 t8
r d )
il2
offree conductorshall be left at each outlet and ", A ' Are least_inches switch pointfor splicesorfor the connection ofJirtures or devices.
r a )
5
r
6
b) ' c )
7
r
20.
8 d) o1th.1,volt'aTlerePe: squarefootbasisthe In determini?8.!o-:d the building shall be usedfor eachfloor.
('
r r a
a)
outsidedimensionsof
b)
insidedimensionsof
c)
heigbt of
d)
numberof roomsin
Electrician Practice Test 4 AIISWERTS the #1 c (it is not 30" deep)Whererock bottomis encountered, electrodeshallbe drivenat an obliqueanglenot to exceed45 degreesfrom the verticalor shallbe buriedin a trenchthat is at section250'52(c) least2%ft(762 mm) deep.Text Reference SeeDiagram
Grounding Electrode Conductor
a ft. tong by 1/2 inch diameter solid copper rod
#2 d (55) 50 amperesand 60 amperesare standardfuse and circuit breakersizesbut 55 is not. Text ReferenceSection 240-6(a) Section430-32(aXl) #3 d (125)TextReference
a
.
fromthe andcablesemerging conductors #4b (18)Direct-buried by to a pointat least8 ft abovefinished gloundshallbeprotected berequiredto exceed18in. grade.In no cas;shalltheprotection Section300-5(d) belowground.TextReference
SectionBasic #5 b (50)225-75 - 100:50 wattsTextReference ElectricalTheory #6 a (9.4)Basicelectricaltheory.Rt - (Rl x R2)/ (Rl + R2);RT : (25x 15)I (25+15): 9.4ohrnsTextReference SectionBasic ElectricalTheory:Productoverthe sum.
R2 1 5o h m s
#7 c (groundedby a 4-wire cord containingthe two hot leads,the neutral, anda greengroundingconductor.the rangerequiresa 4wire cord)A new changeno longerallowsrangesto be grounded with he groundedconductorin new installations.Text Reference Section250-142 #8 b (two (2) singlepole circuit breakers,tied together)In dwelling units, a multiwire branchcircuit supplyingmorethan onedeviceor equipmenton the sameyoke shallbe providedwith a meansto disconnectsimultaneouslyall ungroundedconductorsat the panelboardwherethe branchcircuit originated.Text Reference Section210-4(b) #9 c ( 1500)Text ReferenceSection 250-142 # 10 a (receptacles for electricclocksin the kitchen) Also the smallappliancebranchcircuitscansupplyReceptacles installedto providepower for supplemental equipmentand lighting on gas-firedranges,ovens,or counter-mounted cookingunits.Text ReferenceSection2l0-52(bx2)ExceptionNo. 1
gounding electrode,but it mustbe # 11 b (still an acceptable by at leastoneadditionalgloundingelecfrode.) supplemented Becauseplumberskeepreplacingmetalpipe with plasticpipe the metalundergroundwaterpipe is no longera reliableunderglound groundingelectrode.Text ReferenceSection250-50(a) #12 b (3) Thermalinsulationshallnot be installedabovea recessed fixhre*s enclosure, fixture or within 3 in. (76 mm) of the recessed wiring comparfment,or ballastunlessit is identified for contact with insulation,Tnrc IC. Text ReferenceSection410-66(b) #13 a(white or glay color or threecontinuouswhite stripeson othertlan greeninsulation.)Ax insulatedgroundedconductorof No. 6 or smallershallbe identifiedby a continuouswhite or natural g;ayouter frrish or by threecontinuouswhite stripeson other thangreeninsulationalongits entirelength.Text Reference Section200-6 #14 c (threehoursor more)ContinuousLoad: A load wherethe maximum culrentis expectedto continuefor 3 hoursor more' Text ReferenceSectionArticle 100 #15 b (2.25)No.2 requires2.25cubicinchesperTable370-16(b) Text ReferenceSectionTable370-16(b) Section 370-20 # 16 b (I I 4") TextReference For deviceswith screwshells,the terminalfor #17 b (grounded) ttre gfo*ded conductorshallbe the oneconnectedto the Section200-10(c) screwshell.Text Reference Section240-32;373'2(a) #18 b (114")TextReference
#19b(6)tleast6in.(|52mm)offreeconductor'meaSuredf the point in the box where it emergesfrom its racewayor cablesheath,shall be left at eachoutlet junction, ffid switch point for splicesor the connectionof fixturesor devices. Text ReferenceSection300-14 I
#20a(outsidedimensionso0Thefloorareaforeachfloorshal computedfrom the outsidedimensionsof the building, dwelling unit, or otherareainvolved.Text ReferenceSection 220-3(b)
Electrician Practice Test 5 7 1'
The circuit conductorthat is definedos being intentionallygroundedis the conductor. r
a) grounding
'
b) grounded
r
c) equiPmentgrounding
r 2.
d) groundingelectrode ClassII location are thosethat are hazardousbecauseof the presenceof
a) ignitablevaPors r
u; iPitaule fibers
c
c) combustibledust
r
d; combr:stibleliquids 2 ff tbee resistorcwith values5, 10,and 15 ohms respectivelyare connectedin Jc ohms.Selectthe closest iaraltet, tlrc combinedtotal resbtancebanswef, c
a ) o '4
r
b) 2'3
c
c) 2'7
r
d) 3o'o
of a totalresistance /zo Thewiringin a 200footlong branchcircuil measures per 1,000feet? 0.5ohms.Whatis the resistance r r '-
a) 0'5 ohms b) 1'oohms C) l'') OnmS
,' d ) 5.0ohms 5.
The maximumtotal voltagedrop on bothfeedersand hranch circuitsto the
farthest outletshouldnot sceed
Percentof the supplyvoltaga
r a ) 2 r
b ) 3 c) 4
r
.^
6.
0s
The maximunt voltage drop on either afeeder OR branch circuit to the farthest outlet should not sceed -percenl c a ) 2 ( _ b ) 3 r
c) 4
r o s For dwelling uni,6, the Coderequires a minimum of -for 7. smoll applianceload. r
a) one l5amPerecircuit
r
b) two 15 amPerecircuits
r
c) one 20 amPerecircuit
the kitchen
c
8.
d) two 20 amPerecircuits Generally,equipmentgrounding conductors No, 6 and smaller shaUbe identifrcd by -.
r a ) greencolor unlessit is bare (^ b) greencolor with oneor moreyellow stipes trnlessit is bare c c ) barEconductor bareor Individually coveredor insulatedequipmentgrounding greenor . ^ d ) conductorsshall have a continuousouterfinish that is either greenwith one or more yellow stripesexceptaspermittedin this section.
r e ) All of the above
"O
Rod andpipe grounding electrodesshall not be lcssthan -feet bngth.
r '
r
6
a) b
)
c)
in
l
8
r
10 d) roomof a dwellingunit requiresreceptacleoutletsto be LI n v' Everydining installedso that nopoint alongthefloor line in anywall spacemorethan feet, measuredhorizontallyrfrom an outlcl r a )
6
(.
b)
7
c)
8
e
I t 11'
l0 d) Listed liquidtightJtuible nonmetallic conduit installed in lengths longer shaUbesecuredevery-feel then-feet r {" (-
a)
6'3
b)
6' 4ll2
c)
6'66
f
\t
I
t I
) rt a'
10,10 6; Generally,noncurrcnt-carryingmetalparts of electricalequipmentshoul.d awayfrom lightning rod conductorcin air and 3 be kept at least_feet feetfront tightning conducton in concrete,or shall be bondedto the lightning conductors. t
r C
a
a)
3
b)
4
c)
5
d)
6
| J' ? 'r'
74.
'', "'<
76,
Branch+ircuit cond,uctottsupplykg a shgle motor which operateswtder of the continuous duty shall hary an ampacity not lessthan -percent rating. motor full-load current
c a )
100
r b )
115
r c )
t25
'^d)
140
The naximum number of overcurrent devices(other than thoseprovided in the mairc) in a single cabinet of a lighting and appliancepanelboard shall be
r a )
30
r b )
36
r c )
42
c d )
46
The totol load on any overcurrent device located in a panelboard shall not of iB rating where in normal operationth.eload will uceed _percent contin@r-3 hoursor more.
c a )
65
c b )
70
c c )
80
c
125
d)
Liquid-tightfluible metalconduitmaybe usedin ('
a)
areasthat areboth exposedand concealed
c b )
areasthat are subjectto physicaldamage
(^
c)
4 ll2 nchtrade size
d)
5 inch tradesize
(-
'7 maximum size offlexible metallic tubing that mny be usedin any r| t o The constructionor installation is -.
3/8"
r b )
v2"
r c )
314*
r d )
1"
9 Whereconductorsof lessthan 600 voltsemergefrom the ground they shall rt 1)o beprotected by enclosuresor racewaysthat dendfrom belowgrade to a aboveJinishedgroda point at lcast-feet
rI "O
c a )
4
c b )
6
' c )
8
c d )
10
The total number of quarter bendsallowedin one run of rigid nonmetallic conduit shallnot exceed-. l'
a
)
a1
' b )
3
{-c)
4
|'
20.
'
d
)
J
larger enter Wtere ungroundedconductorsof minimum size No.-or an insulated protected by be shall conductors a racewaym a cabinet,tlrc litting, c a )
J
c b )
4
c c )
6
' d )
)
Electrician Practice Test 5 AI\ISWERES # 1 b (groundedGroundedConductor.A systemor circuit conductorthat is intentionallygrounded.)TestReferencesection Article 100:groundedconductor #2 c (combustibledust)Classtr locationsarethosethat are hazardousbecauseof the presenceof combustibledustTest Referencesection500-8 #3 c (2.7)For the5 andl0: (5 x 10)I (5 + 10): 3.3:3 in parallel section with l5 is (15x 3.3)/ 15+ 3.3):2.7 ohmsTestReference BasicElectricalTheory is 5 x .5:2.5 ohms #4 c (2.5)1000is 5 times200soresistance TestReferencesectionBasicTheory #5 d (5) 5 percenttotal: 3 percentfor feedersor 3 percentfor sectionzl0-l9(a)FPNNo. 4 ;2L5branchcircuits.TestReference c(b) FPN No. 2 FPNNo. 4; 215-2(b) section2L0-19(a) #6b (3) TestReference FPN No. 2 #7 d (two 20 amperecircuits)In additionto the numberof branch circuits requiredby otherpartsof this section,two or more20branchcircuitsshallbe provided. amperesmall-appliance TestReferencesection2L0-11(cX1) section250-119 #8 e (atl of the above)TestReference shallnot be lessthan8 ft (2.44m) #9 c (8) Rod andpipeelectrodes in lengthTestReference section250-52(c)
# 10 a (6) In every kitchen, family, dining, recreation,living room' parlor, library, den,sunroom,bedroom,receptacleoutletsshall be installedso that no point alongthe floor line in any wall spaceis rnore than 6 feet from an receptacle. Test Referencesection 210-52(a) and351-27 section35L-23(a)(5) #11 a (6, 3) TestReference #12 d (6) Separationfrom lightning protectionconductorsis typically 6 ft (1.83m) throughair or 3 ft (0.92m) throughdense materialssuchasconcrete,brick, or wood.TestReference250-106 FPN No. 2 #13 c (I25) Branch-circuitconductorsthat supplya singlemotor used in a continuousduty applicationshall have an ilmpacity of not lessthan 125percentof the motor's full-load currentrating as determinedby Sectiona30-6(a)(1).TestReferencesection43022(a) #I4 c (42) Not morethan 42 overcurrentdevices(otherthanthose provided for in the mains)of a lighting andappliancebranchcircuit panelboardshallbe installedin any one cabinetor cutout section384-15 box TestReference #15 c (80) Thetotal loadon any overcurrentdevicelocatedin a panelboardshallnot exceed80 percentof its rating where,in normal operation,the load will continuefor threehoursor more. TestReferensesection384-16(d) # 16 a (areasthat areboth exposedandconcealed)TestReference section351-4 #17 d (1") This seemsvery small,but it is what the Codesays.The Minimum BendRadii is 17 LlZ nches! TestReferencesection
34e-10(b)
section300-5(d) #18 c (8) TextReference section34T-L4 #19 c (4) TextReference #20 b (a) WhereracewayscontainingungroundedconductorsNo. 4 ot largerentera cabinet,box enclosure,or raceway,the conductorsshallbe protected.Text Referencesection300-a(f)
Etectrician Practice Test 6 I ro
Fountainsthat have water commonto a swimmingpool do not needto comply with all of the swimmingpool requirements. (-
a)
c b ) )
-a
gna-
a)
r b )
4,
False
' a )
True
r b )
False
The -minimum depthfor any underwaterlightingJirture is 4 ittches below 19arcr,
(_
6.
True
Steeljunction boxesmay be wed to supply underwaterfrxtureswhen they are connectedby conduit to theforlorming shell
{-
*S
False
The walls of a bottedor weldedmctal pool may serveas the common bonding
{-
1 -"
True
a)
True
b)
False
GFCI protection is requiredfor arty branch circuit that suppliesunderwater ftxtures operating at over LS-volts.
r a )
True
r-
False
b)
locatedwithin 20feet of a swimmingpool require GFCI Receptacles proteurcn.
r a )
True
{-
False
b)
7.
8.
9.
70.
A storable swimming pool must not haye any dimension over 12feel
r a )
True
r b )
False
In a data-processingroom the disconnecting meons must be near the sit doon. ? a )
True
c b )
Faise
A disconnecting means must beprovidedfor all data-processingequipmenl
c a )
True
c b )
False
fipe NMC cablesis permitted to connectdata-processingequipmentby underfloor wiring.
r a )
True
r b )
False
The bottomof a sign must be at least 12feet abovean area accessibleto 77. vehicles.
r a )
True
r b )
False
srgzs using incandescentlamps must be marked with the maximunt 72. Electric allowable watlage of lamps. c a )
True
r b )
False
lightingJirture is permifled in a clothes 7 3 .Amahilainedfrom the storagearea(-
a)
closet if an |&-inch clearance is
True
r
False b) usesnap switchmrut not be usedto control a tungsten' 74. An AC general /ilament lamp loads,
r a )
True
r-
False
b)
7 5. Junction boxesmust be accessible' c a )
True
r b )
False
duptu receptaclein a box reducesthe number of allowed conductorsby 7 6. A
wo.
^) ' b )
7 7.
True False
are acceptableforstandardinstallations. Edison-basefuses
r a )
True
r b )
False
over 5feel 78. Fluible metallic tubing may not be usedin lengths c a )
True
c b )
False
ground in cinder concrete must hm'e a protective layer Lt "O EMT installed in the of noncinder concreteat least 2 inches thich F ('
a)
True
r
20.
False b) The lorgest size NM cable has No. 2 copper conductott or No. 2 aluminunt conduc'tors.
r a )
True
r b )
False
Electrician Practice Test 6 A}[SWERES #1 b (false)Text ReferenceSection680-50 #2 a(true) thereareothercommonbondinggrids,too. Text ReferenceSection680-22@) #3 b (false)Must be copper,brass,suitableplastic,or other material.Text ReferenceSection680approvedcorrosion-resistant I2(a) #4 b (false)Lighting fixturesmountedin walls shallbe installed with the top of the fixture lensat least18 in. below the normal water levei of the pool, unlessthe lighting fixture is listedand identifiedfor useat a depthof not lessthan4 in. Text Reference Section680-20(a) #5 a(true) ground-faultcircuit intemrptershallbe installedin the branchcircuit supplyingfixturesoperatingat morethan l5 volts Text ReferenceSection680-20(a) locatedwithin 20 ft' (6.08m) of #6 a (true)all 125-voltreceptacles the insidewalls of a pool or fountainshallbe protectedby a glound-faultcircuit intemrpter.Text ReferenceSection68020(a)(3) #7 b (false)StorableSwimmingor WadingPool.Thosethat are constructedon or abovethe groundandarecapableof holding water to a murimumdepthof 42 in. (1.07m), or a pool with nonmetallic,moldedpolymericwalls or inflatablefabric walls Section680-4 regardless of dimen.Text Reference
#8 a (t'r:e) The control for thesedisconnectingmeansshall be groupedandidentifiedandshallbe readily accessibleat the principal exit doors.Text ReferenceSection645-10 #9 a (tnre)The FryAC equipmentmust alsobe disconnected Text ReferenceSection645-10 #10 b (false)Thereis a long list of wiring methods,but NMC is not in the list. Text ReferenceSection645-5(dX2) # I I b (false) Sien or outline lighting systemequipmentshall be at to vehiclesunless least14 ft (4.4 m) aboveareasaccessible protectedfrom physicaldamage.Text ReferenceSection600-9(a) #I2 a (tnre) Signsandoutlinelighting systemswith incandescent lamp holdersshall be markedto indicatethe maximum allowable watiageof lamps.Text ReferenceSection600-4(b) Section410-8 #13 a(tue) Text Reference #14 b Text ReferenceSection(384-A(a) #15 a (true)Conduitbodies,junction,pull, andoutletboxesshall be installed so that the wiring containedin them can be rendered accessiblewithout removinganypart of the building Text ReferenceSection 370-29 Section370-16(bX4) #16 a(true) Text Reference type shallbe installed of the Edison-base #17 b (false)Fuseholders only wherethey aremadeto acceptType S fusesby the useof adapters.Text ReferenceSection 240-52 Section349-5 #18 b (false)6 ft. Text Reference
L .
t :
gj I '. r, L: i t_;
t
.
\
E.,
t -
l.:
#L9 a(true)In cinderconcreteor cinderfill wheresubjectto pennanentmoistureunlessprotectedon all sidesby a layer of non cinderconcreteat least2 n. (50.8mm) thick or unlessthe tubing is at least18 in. (457mm) underthe fill' Section348-5(3) Text Reference shallbe sizesNo. 14through #20 a(nue) Thepowerconductors or sizesNo. 12throughNo.2 wittr No. 2 with copperconductors aluminumor copper-cladaluminumconductors. Section336-30(b) Text Reference
l
i
: t r
Etectrician Practice Test 7 l.
1 i
TypefuIV cableis rated 2,001'volt or higher. r
a)
True
,^
L r I
-')
rj 3.
r'
False b) Open wiring on insulatorsabove6feetfrom theJloor doesnot require protection.
r a )
True
r b )
False
mtut not be usedin hoist ways. Cable troy systems
r a )
True
r b )
False
Flexibte metal conduit may be usedto protect conductorcemergingfrom the ground and run on a Pole" r-
a)
True
r-
t
t..:
,S
False b) (Jndernormal conditions,direct buried cablesmust be buried at least24 inches. (-
a)
True
r b )
False
conductorin a vertical racewaymust be supportedat least 6 v' A No. 6 copper every80feet i,.
C
r t .
L :
a)
True
b)
False
7.
Conductors of size No. l for generol usemoy not be run in paralleL r
a)
True
c
g.
False b) A connectionof aNa E conduc'lorto a terminal can be by meansof a pressure connec'torot soWerlug. r
a)
True
r
"O
False b) At least1 Inches offree conductor must be lelt at each outlet to connecl ftxtures. c
a)
True
r
'I n v'
False b) Holes in studsfor coblesmut be in the center and not lessthan I inch from the nearestedgeof the stud r ,-
7 7.
True
b)
False
The smallestJirture wire permitted by the Codeb size No. 18. r '
|) 1-'
a)
a)
True
b)
False
Ftsibte cordsmaynot be usedif theyare concealcdbehindbuildingwalls, orfloon. ceilings c c
a)
True
b)
False
I
. a
i
i
? rt J'
j t
I4. t"i
When six current
r a )
True
r b )
False
A No. 11 grounded conductor in a circuit must havea white or natural gray color,
r a )
True
r b )
False
( tap lessthen 25feet long doesnot require overcurrentprotectionif rt Jc A feeder tie ampacityoytn" tup conductorsis ot leastone-half of theompacityof the feeder conductorc.
v' 4t 6
L'1
17.
r a )
True
r b )
False
may be A conductorin a general circuit with an ampacityof 731-amperes protectedby an 8h0-ampere.fuse. r a )
True
r b )
False
A three-phaseair conditioner must be directly connectedto a recognized wiring method c a )
True
r^
^t R v'
€,
G 4
False b) An attachmentplug and receptaclemay disconnectcord-connected householdrifrigerating equipmenl r a )
True
.-b)
False
19.
TypeAC cablemustnot be usedto connectmotorcto their supply, r
a)
True
.-
False b) motorcsupplicdby metal+nclosedwbing mustbe 20. fhefrqmls of stationary grounaea. c c
a)
True
b)
False
Electrician Practice Test 7 ANSWERES
a ;
1..
t-
\,
t
#l a(true) Type MV cableis a singleor multiconductor solid dielectricinsulatedcablerated2001volts or higher. Text ReferenceSection326-l #2b (false)Conductorswithin 7 ft (2.13m) from the floor exposedto physicaldamage.Text shallbe considered ReferenceSection 320-14 #3 a (true)Cabletray systemsshallnot be usedin hoist ways or wheresubjectto severephysicaldamage.Text ReferenceSection3 18-4
l ,
t
t..
L;
#4 b (false)Direct-bwied conductorsandcablesemerging or from the groundshall be protectedby enclosures racewaysextendingfrom the minimum coverdistance requiredby Section300-5(a)belowgade to a point at least 8 ft (2.44m) abovefinishedgrade.Wherethe enclosureor racewayis subjectto physicaldamage,the conductorsshall be installedin rigid metal conduit,intermediatemetal conduit,Schedule80 rigid nonmetallicconduit,or equivalent.Text ReferenceSection300-5(d)andsection
3s0-s(6) #5 a (true)In generalthe requhementis 24 incheswith many otherdepthsgiven.Text ReferenceSection 300-5 andtable300-5 #6 b (false)Text ReferenceSection300-19(a)andTable 300-19(a)
#7 a (true) Aluminwn, copper-cladaluminulll, or copper conductorsof sizeNo. 1/0 and larger,comprisingeach phase,neutral,or gfoundedcircuit conductor,shall be permittedto be connectedin parallel (electricallyjoined at both endsto form a single conductor).Text Reference Section 310-4 #8 a (true) Connectionby meansof wire-bindingscrewsor studsandnuts that have upturnedlugs or the equivalent shall be permittedfor No. 10 or smallerconductorsonly. Text ReferenceSection 110-A(a) #9 b (false)6 inches,not 4 inches.Text ReferenceSection 300-14 #10 b (false)1 1/4 inchesfrom nearestedge.Text ReferenceSection"CENTER" # 11 a (tnre)Text ReferenceSection 402-3andTable 402-3 #1,2a (true)Text ReferenceSection 400-8 #13 b (false)80 per cent,not 70percent. The Note 8 to the 1996NEC is now a new table in the 1999Code.Text ReferenceSestion 3 10-15(bX2Xa) #I4 b (false)Thereareotherrules,too. Text Reference Section200-6(a) # 1s b (false)240-21(2) #16 a (true)Text ReferenceSection24A-3@)
.-: i
" .; * .
#77 a (true)A room air conditionerthat is ratedthreephase or ratedover 250volts shallbe directlyconnectedto a \MiringmethodrecognizedinChapter3, andprovisionsof Art 440Part G shall not apply.Text ReferenceSection 440-60
".
Section422-16 #18 a (true)Text Reference
t
Section333-4 #19 b (false)Text Reference
#20 a (true)Text ReferenceSection43 0-142
1.. .
Electrician PracticeTest 8 of being
I
:
disconnectingmeansfor a 2,300-voltmotor must be capable 7. Alocked in the openpositiott r
a)
True
c
-')
False b) The branch circuit overcurrent devicemt y serveas the disconnecting means for, motorsroted lessthan one horseltower. c
r,i
r
a)
True
b)
False
3. A motor confioUermust open all condactorsto the mator. c
a)
True
r
4.
False b) In general,enclasuresfor motor controllersmtnt not be usedasiunction boxes. r
a)
True
r
t.. -
False b) panehJor de-icingmust not exceeda rating of l20'watts/square J. Heating fooL
L -
r c
6.
a)
True
b)
False
Excessleadsof heating cablesmust not be cuL
r a )
True
r b )
Faise
7,
In most cases,heating cablesinstalled on ceihng boardsmust be secured at intemals not exceeding16 inches. (^
a)
True
r
8.
9.
False b) Conductors located abovea heatedceiling are consideredto operatein a 40'C ambicnl
r a )
True
r b )
False
The non heating leads of 120-volt spaceheating cablesare yellow, (-
a)
r b )
True False
unit switchesmay disconnecta heater if other meansof disconneclionare 70. provided.
r a )
True
c b )
False
cord and plug may be the disconnectingmeansfor a wall-mounted 17. Aelectric oven.
12.
c a )
True
r b )
False
Dishwashersmrrybe connectedwith TypeSPflexiblc cords.
r a )
True
r b )
False
t
,
I
73. F'Iexibtecords are permitted only to supplyportable appliances. c a )
True
c b )
False
l . ;
74.
Toastersmay have live parts exposedto contacl
t .
r' I
: t ;
a)
True
r
False b) a 180-voltsystemrequireda connectingconductorof r't < A surge arresterfor No.14 copperor larger. r^
a)
True
'
't 6 v'
False b) If a generatoroperatesat 115-voltsor more,protection of live parts is required when the generatoris accessibleto unqua$ied persons. (' c
17.
a)
True
b)
False
The nominal voltageof a lead-acidbatteryis 2.0 voltsper celL r
a)
True
('
False b) operating at 300-voltsmust be dischorgedto S0-voltsor less ^t R v' A capacitor within one minute after it is disconnectedfromthe supply. , ^ a )
True
(-
False
b)
q ^I ' ' Capacitorcircuit conductorsmust have an ampacityat least125%of the rated currcnt of the capacitor. r r' 20,
a)
True
b)
False
Potential or voltage transformers installcd indoors require primaryfuses. (' ('
a)
True
b)
False
I
Electrician PracticeTest 8
,
Af[swERES '
#l a (tnre)Text ReferenceSection430-127
i-,
I
#2 b (false)For stationarymotorsof 1/8hp or less,the branch-circuit overcurrentdevice shall be permittedto serveas the disconnecting means.Text ReferenceSection430-109(b)
I' -
#3 b (false) The controller shall not be requiredto openall conductorsto the motor. Text ReferenceSection430-84
-
[ ,
i
i
means tl4 a (tnne)Enclosuresfor motor controllersanddisconnecting shallnot be usedasjunction hxes, auxiliarygutters,or racewaysfor conductorsfeeding through or tapping off to the other apparatus unlessdesignsare employedthat provide adequatespace.Text ReferenceSection430-10(a)
"
#5 a (tme) There are also heatingpanelrequirementsfor space heatingin Article 424.Text ReferenceSection 426-20
L
#6 a (true) Excessleadsof heatingcablesshall not be cut but shall be securedto the tmdersideof the ceiling and embeddedin plasteror other approvedmaterial, leaving only a length sufficient to reachthe junction box with not lessthan 6 in. (I52 mm) of free Text Reference Section42443(c)
i ,
l.'l
L i, ; r
#7 a (true) Cablesshall be securedby meansof approvedstapling, tape,plaster,nonmetallic spreaders,or other approvedmeansat either intervals not exceeding16 in. (406 mm) or at intervals not exceeding6 ft (1.83m) for cablesidentifiedfor suchuse.Text ReferenceSection424-4I 48 a (true) Wiring locatedaboveheatedceilingsshall be spacednot lessthan 2 n. (50.8 mm) abovethe heatedceiling and shall be consideredas operatingat an ambienttemperatureof 50oC(I22'F). Text ReferenceSection424-35
#9 a (tnre) Text ReferenceSection 424-35 "ofP'positionthat is #10 a(true) A unit switch(es)with a marked part of a fixed heaterand disconnectsall ungroundedconductors shall be permitted as the disconnectingmeansrequiredby this article where other meansfor disconnectionareprovided. Text Reference
Sectiona2aa9@) # I 1 b (false)Text ReferenceSection422-16@)(3) shallbe andtrashcompactors #12 b (false)Buitt-in dishwashers with a flexible cord permittedto be cord-andplug-connected identifiedassuitablefor the purposein the installationinstructionsof Text the appliancemanufacturer. ReferenceSection 422-16(bX2) Section400-7 # 13b (false)Text Reference #14 a(true)Appliancesshallhaveno live partsnormallyexposedto heating contactotherthanthosepartsfunctioningasopen-resistance elements,suchasthe heatingelementof a toaster,which are Section4224 Text Reference necessarily exposed. shallnot be conductors #15 a (true)Line andgroundconnecting smallerthanNo. 14copperorNo. 12aluminum.Text Reference Section2580-21 #16b (false)TextReference Section445-6 #17 a (true)Text Reference Section480-2 # 18 a (true)Text Reference Sectiona60-6(a) Section460TextReference # l9 b (false)135%is the requirement. 8(a) #20 a (true)Text Reference Section450-3(c)
Electrician PracticeTest 9 t l
z'7
The branch circuit loadfor a l2-kilowatt electric range h a dwelling is 8' kilowatt.
r a )
True
c b )
False
4,..'
2. An appliance always requires a dbconnecting means.
r a )
True
c b )
False
Qij
A lfu-amperebranch circuit nuy supply severalfrxcd elcctric spaceheaters in v'? a dwelling,
/a'
r'S
6 v'
r a )
True
r b )
FaIse
The rating of the overcufientprotective devicefor a circuit supplying a hermetic. motor
r a )
True
r b )
False
To measurethe area of a dwelling to iletermhe the lighting load, the ou8ide dimensions,including the garage, are tued
c a )
True
.-b)
False
lJnder no circumstancescan the continuousload suppliedby a branch circuit uceed 80% oJthe branch circuit rating.
c a )
Tnre
c b )
False
7.
A 2D+mpere bundry circuit is alwaysrequired h each dweUingunil (-
a)
True
r
f, v'
False b) Branch circuit conduc'totrrsupplyingftxcd resistivetypespaceheaterc must be roted at 125% of the heatcr load. r
a)
True
r
''O
False b) Thefeeder load shall not be kss than the sum of the loa^ on the brqrch circuit alter any applicabtedenandfactors havv beenopphed r
a)
True
.^
False b) load -, n "' When the standard calculation method is used,the minimumfeeder fo, a householdelec:tricclothesdryOris 51000wafrs. c
a)
True
c
^t ^'I
False b) The optional calculation methodfor a dweUhg unit may be rced when the semiceis a two-wire, 120-voltsentice. r
a)
True
r
^| -'7
False b) The optional calculation tnethodfor multi-family dwellings doesnot apply tu dwellings'whose uni8 have neither electricspaceheoting nor airconditioning.
c a )
True
r b )
False
The semiceenfiance equipnentfor a one-family dwefiing, if 7 3 .amperes and hstalled indoiorc,mwt be illuninated c
a)
rated 200'
True
r
74.
False b) The worhhg clearanceinfront of live parts, operating at 120-vol6' must be at least threefeel
c a )
True
c b )
False
be 6'feel 7 5. The minimum headroom around a motor control center must r
a)
True
r
't 6 v'
False b) On a switchboardwith bns bars,normally,phoseB would havethe highest vohageto ground in a high'leg delta arrangemcnL ' a )
True
r b )
False
load 7 7, A 211-arnperepanel board may supptya 200-amperenoncontinuous c
a)
True
c
False b) or more of its t R A lighting and appliancebranch circuit panel board has 10% 1v' overcurrentdevicesrated 30'amperesor less.
r a )
True
(^
False
b)
the neutralbar in aponel bo,ardnot I g. Theterminal bar is.notbonncctedto rced asserviceequipmenl r f ('
^\
True
8,,
b)
r
False
20. Transformers rated over 35,000-voltsmustbe installed in a vault
c a )
True
c b )
False
t , t
ElectricianPracticeTest 9
I
ANSWERES
I
t,.
Table220-1.9 section220-19, #L a (tnre)TextReference
I l
#2 a (true)Text ReferenceSection422'30
,
#3 b (false)Text ReferenceSection 424-3(a)
t..
#4 a (tnre)Text ReferenceSection440'22(a) L :
#5 b (false)Text ReferenceSection220-3(a) Section384-16(d)Exception #6b (false)TextReference #7 b (fatse)Text ReferenceSection220-52(f)Exception Sectiona24-3(b) #8 a (true)Text Reference #9 a (true)Text ReferenceSection220-10 L.
Section220-18 #10 a (true)TextReference Section220-30 #11 b (fatse)Text Reference
!.;
Section220-32(a) #12 a (true)TextReference t.'
Section110-26(d) #13 a(true)TextReference Section110-26(a) #14 a(true)TextReference
,
Section1l0-26(e) #15 b (false)TextReference i
Section384-3(f) #16 a(true)TextReference t
t
_
#17 a (true)Text ReferenceSection384-16(a) #18 b (false)Text ReferenceSection384-1a(a) #19 a (true)Text ReferenceSection384-20,detailsn250-24(5) #20 a (tnre)Text ReferenceSection450-21(c)
Electrician PracticeTest 10 I.
Thefeederneutral may besmaller than the ungroundedconductorsin some cases.
r a )
True
r b )
False
2. An indivitlual branch circuit mty supplyonly one outlel r a )
True
.-b)
False
in a dweuing, 3. A 3T-amperebranch circuit may supplyfixed lighting units r
True
a)
{-
/ a'
False b) fn general continuousloadson branch circuitsmay not esrceed75%of the roiog of the branch-circuit rating. ' 't
lrue
a) ^
b)
F
r
lalse
typetamp holdersare requiredon branclt-circuitshaving a ,S Heovy-duty rafing in excessof 20-amPeres.
{ t.
6,
r a )
True
.-b)
False
The branch-circuit rating is determinedby the conductorampacity.
t,,
t.
c a )
True
c b )
False
7.
The woil switch controlled lighting outlet required in dwelling unit kitchens mry be a receptacleoatlet in lieu ota lighting outleL (-
a)
True
r
8.
False b) Receptaclcoutlets in bathrooms oldweiling unin require ground'falh ci rc uit inten upter p r otectio n. r
a)
T ru e .
('
9.
False b) [Inless it is bare, an equipment grounding conduc'tor must always be identitfiedby a continuousgteen color or a continuousgrben color with one or more yellow sfiipes; c
a)
True
c
tn t'vc
False b) If a muhi-wire branch-circuit has a branch-chcuit protective devicethat can supptytneeoch ungrouniied contductorsimultaneo,usirylnidi'A ipr to-line loads.. c f'
7 7.
a)
True
b)
False
The denandfactorfor three kitchen unit loads in a restaurantis 90%. {^
a)
True
r
LI -'?
False b) The minimum semiceloadlor each mobile home sitein a mobile home volt-amperes, park is 121000
r a )
True
r b )
False
-i
, 2 t J'
t
The optional calculatbnJor computing thefeedn ol qemicelogdlor a scttoil would not apply to a schoot with elcctric sPaceheating or aii conditioning. r
a)
True
r
L| /"
False b) providing shorepowerfor bo,atsat.marinas shall The rating gf recepta.c.les not be lessthan 20 amPeres. r
a)
True
r
r| "'<
False b) The maximum voltagedropfor branch circuig andfeederscombined should not uceed 3% of the circuit voltage' (^
a)
True
r
False b) and the settingfor a circuit breaker usedas an overcuryent ''" The size ''t 6 protective deviceare identicaL c
a)
True
r
Faise b) protectedby 1S'ampere circuitsin industrial establishments I7 a / t Branch overcunent devicesmay supply load operatingat 300 volts or less'
L .
l
r
t "
a)
True
r
IR 1v'
False b) A multl-wire branch circuit protectedpyfuses may supply only one load, or onb line'to'neutral loads. r r-
a)
True
b)
False
t O A Eghting and appliancepanel board is a panel board which hosmore than 1" 10% of ib overcuient devicesrated 30 omperesor'lessand have neutral connections. r r 20.
a)
True
b)
False
No separatereceptacleload is required in guestroiomsof hotets and motels. '
^\
IfUe
h\
f UUSe
a,
'
,A
) t
Electrician Practice Test 10 AIISWERBS #I a (tnre)Text ReferenceSection220-22
t
Section2l0-21(b) #2 a (true)Text Reference #3 b (false)Text ReferenceSection 210-23(b) #4 b (false)Text ReferenceSection384-16(d) #5 a (true)Text ReferenceSectionZI0-21(a) #6 b (false)The branchcircuit rating is determinedby the sizeof the overculrentprotectivedevice.Text ReferenceSection210'3 #7 b (false)TextReferenceSection 210-7(aXI ) Section2I0-8(a) #8 a (true)TextReference #9 b (false)TextReferenceSection250-I 19(a) Section2l0-a(c) #10 a (true)TextReference Section220-20andTable220-20 #11 a (true)TextReference load or the calculated #12 b (false)It is 16,000Volt-amperes which everis greater.Text ReferenceSection550'22 Section220-34 #13 b (false)Text Reference Section555-3 #14 a (true)TextReference section2l0-19(a)FPNNo.4 #15 b (false)TextReference
#16 b (false)Text ReferenceSection 240-6(c) #17 a(true) Text ReferenceSectionPermissibleload 2L0-23(a) #18 a (true)Text ReferenceSection210-4(b) #19 a(true) Text ReferenceSection38a-1a(a) in living #20 a(tme) The sarneappliesto dwelling unit receptacles rooms andbedrooms.Text ReferenceSection220-3(b)
t,: I
:
t ,
Electrician PracticeTest No. 11 rtt
-').
For dwelline unit with a 240/120single-phasesemicethefranu of a 4,500 watt 240/12-0vott clothesdryer shall begroundedby wing the grounding conductor(new in the 1999NEC.) The minimun sizecopperconductor is:
r a )
N o. 10
c b )
No.8
r c )
N o. 12
The minimum size copPerequipmentgrounding conductorfor a 200'ampere circuit is: r-
a)
No.8
b) r c )
No.6
(-
,?
No.3
Whennot under concrete,rigid metal conduit must be buricd underpublic highwaysand streetsat least: ( a )
24 inches
f^
18 inches
b)
r c )
6 inches
r d )
4 inches
may be /r ' 120-volL2l-ampere GFCI protectedresidentialbranch circuit buried:
t ;
a '
a )
l2 inches
' b )
18 inches
c)
18inches
5.
6.
The tisted ampaeitiesof 75 Degrees C. conductam in a ruc*eay must be reduced when the ambient air temperature exceeds: r
a) 60 degreesC'
r
b) 75 degreesC'
c
90 degreesC. ^r w,
r
d) 30 degreesC'
Non metallic densions must be run onlyfrom circuiF with a rating of: r
a) 15or20 arnPeres
r
U; 12svoltsor less
r
7.
c) 30 amPeres WhenNOT usinga one-shotbender,the minimum radius of the cune of the inner edgeof anyfutd bend of 2-inch rigid metal conduit containing ){IIHW conducton is:
c
a)
9 1/2 inches
b)
12 inches
r c )
15 inches
r
n v'
In a straightrun, 2-inch rigid metal conduit with threadedcouplings may be supportedat intentals not uceeding:
r r r
9,
a)
10 feet
b)
12 feet
c)
16 feet
The maximum size of electrical metallic tubing is:
r a )
6-inch
r b )
4-inch
r c )
2-inch
I0.
-t -'I
For metallic and nonmctallic, auxiliary gutterc must not beJilled to greater
c a )
20%
r b )
30%
c c )
40%
('
60%
d)
The multipherfor bending offsetsb called the-of fo, the ofiset bends.
r a )
sine
c b )
cosine
r
secant
c)
r d ) I2.
the angle used
cosecant
The largestconductorallowed in a standard box without other restrictions ts.'
r a )
No.4
c
b)
No'8
c)
No.6
general usesnap switch mty control what inductiveload as a ' t r? ' An AC-DC percentageof its amPererating? c a )
80%
r b )
50%
(-
75%
c)
74.
Tir" o^pocity of No.14ftxture wire is: {^ r
a)
8 amPeres
b)
tJ amFeres
c
17 a:nPeres c) clearance between livepartsfor a systemoperoting at 480 I S. The working volts is: (' (' ('
76.
a)
3 feet
b)
i l/2 feet
c)
4 feet
Guarding by elevationfor a 600-volt circuit requires an elevation of: {'
a)
8 feet
b)
6ll4 feet
'
I7.
8 112feet c) Conduit or Jittings must not riseinto the bottom of a switchboardenclosure more than: r (. r
a)
8 inches
b)
3 inches
c)
10 inches
three-phase,three wire panel board with l0-ampere circuit breakersmay Lt R v' A contain a number of deviceswith a maximum of: r r
a)
42 Poles
b)
Any numberof poles
r'
40 Poles c) O For a centerline radiusof 20 inchesand a 45 degreebend the developed zt '" bngth of the conduit isfound by usingthefollowingformula: r r c 20. lor
a)
d l = 2 0x 9 0x 0 . 0 1 7 5 .
b)
d l = 2 0 x 4 5 x 0.0175.
dl -- 20 x 90 x tangentof 45 degrees c) a centerline radiusof 20 inchesand a 90 degreebend the gain
ls.'
r' r c 1 I
I
a)
9.5inches
b)
6 inches
c)
4'lzsinches
'i'
Electrician PracticeTest No. 11
, ' f,1
OCPD:25 or 30 #l a(No. 10)5,0001240:2A.8;Requires amperes.By Table 250-t22 a25 or 30 ampere.CB requiresa No. 10iopper groundingconductor.Text ReferenceSectionBasic ElectricalTheorySections220-19,240-3andTable250-122
L
#2b (No. 6) Text ReferenceSection250'122
',i , r,
#3 a (24 inches)Requiredfor understreets,highways,roads, alleys,driveways,andparkinglots Text ReferenceSectionTable 300-5column2
. n '
#4 a (12 inches)Truefor residentialbranchcircuitsrated120 Volts or Lesswith GFCI ProtectionandMa:
t
., .,, { ,
for nonmetallic #6 a ( 15 or 20 amperes)One of the requirements e5ensionsis the extensionis from an existingoutleton a 15- or of 20-amperebranchcircuit in conformitywith the requirements Article 210.Text ReferenceSection342'3(a) "9.5 inchesthis is OK for #7 b (12 inches)Correctper table346-10 a one-shotbenderasgiven in table 346-10Exception.Text ReferenceSection346-10
#8 c (16 feet) 16 feetprovidedthe conduitis madeup with threadedcouplings,and suchsupportspreventtransmissionof stressesto tenninationwhereconduitis deflectedbetween supports.Text ReferenceSection 346-12(b)(2)andTab|e 346L2@)(2) #9 b (a inch) Rigid canbe 6 inchesma:
;
'
#18 b (Any numberof poles)This is not a lightingandappliance panelboardthat canhaveonly 42 polesotherthan the mains.Text Section384-14and384-15 Reference
:
'
'
#19b (dl : 20 x45 x0.0175.)Themultiplier0.0175is equalto (2*pi)I360 #20a(8.5 inches)
Electrician PracticeTest No. 12 7.
The length of a TypeS cord connectingo trashcompactormust not exceed: r r c
a)
18inches
b)
4 feet
c)
36 inches
oveft 2, Screw-shetltamp holden must not be usedwith infrared lamps rated r c r
a)
300watts
b)
6oo watts
c)
150watts
casecircuit breakermty serveas the disconnectingmeansfor ,? A motded motur driven aPPliancesrated: c r r
a)
Not over one-halfhorsePower
b)
Not over onehorsePower
c)
Not over one-thirdhorsePower
(-
All of the aboveif the circuitbreakeris listed. d) non motor operatedappliancemust not beprotectedat 4, A 27-amperesingle more than: {c l^
a)
20 amPeres
b)
25amPeres
c)
30 amPeres
5.
The minimum length of non heating leadsfurnishedfor heating cables is: c c r^
6.
a)
7 feet
b)
8 inches
c)
3 feet
The non-heating leads of 210-volt heating cable ore: r (. r
a)
Yellow
b)
blue
c)
red
7, Wiring aboveheated ceilings must be spacedabovetlte ceiling at least: r r c 8,
a)
4 inches
b)
2 inches
c)
3 inches
The separation betweenheating cabks an outlet box must be at leost: c r
a)
8 inches
b)
2 inches
r
6 inches c) runs of heating cablesnot exceeding2 3/4 watts[oot in ceilings "C) Adjacent mtnt be spacedon centersof: c r c
a)
I 1/2inches
b)
16 inches
c)
1 inch
branch-circuit cdnductots supplying a resistanceheater withoul a uc The rI n motor rated at 16 amperesmust havean ampacilyof: r c
a)
16 amPeres
b)
2o arnPeres
r t rt tc
32 amPeres c) When a disputeor a problcm arisescgncgTningthe interpretation of-the would be the most Ekely to whici of thefoilowing Nafionat Eiectricat iode, ' : ;' sbtvith'eproblei? f
T',
r r
a)
The electricalcontractor
b)
The I.A.E.I. organization
c)
An electricalengineer
r
7) r2o
The chief electricalinspector d) The lengtlt of a pull box usedin straight pullstor No. 4 and larger how many timesthE trade diameterof the coitducfo* ihiit not be liss than :: : largestiacewaY?
t
r:
r' a )
five
'
b) ' c )
slx
'
ten
d)
Metal plugs or plates used,with-noimetallic boxes, conduit bodies orJittings -I J? o shall 6e rZcessia at kast ,how far from the outer surface?
c c r r
a)
i/4 inch
b)
Flush
c)
U2inch
d)
5/8 inch
I4.
Which of thefollowing locations is not permittedfor the rce of sudace faceways( r r r
a)
A drY location
b)
ConcealedUnder plaster
c)
Under dataprocessingroom floors.
c
S !'t -"
In ClassI division 2 locations O Generolly,underfloor rac:ewaysnro,tmore than 102millimeterx witteshatl nave no lessthan how much concreteor wood abovethem? c ' n
a)
2 inches
b)
4 inches
c)
3/4 inch
(-
Lt 6 v'
t/2 rrich d) In a Class7, DivisionI location a conduil passingthrough'into a non hazardouslocation wiII harc the sealingtitting insulled where? (^ c f
a)
On both sidesof the boundarY
b)
On eitherside of the boundary
c)
No sealrequiredunderthe circumstances
c
At the first fitting d) in walls of non combustiblematerial will be ' ' Boxs which are installed ^t 7 installeil so that thefront edgeof lhe box is nofarther back than? {^ r (c
a)
Flush
b)
ll2 nch
c)
3/g inch
O
1/4 inch
p partsexposedon thefront of a switchboardarepresenl The working rt oo Live ,po"L in froit of the switchboardwill not be lessthan? r (c
a)
24 inches
b)
3Oinches
c)
36inches
a
42 inches d) O Whaf b fie rtnimum sizeof conductorwhich requires an insulation rt '7t bushingwhen entering into a racewayin a iunction box? r r r
a)
No.6 TIIW
b)
No'4
c)
No' 10TW
r
1n 2u'
No' 12 d) For a conductorat a terminal which leavesa cabinet the minimum wire bendingspaceat the terminal slnll be how much if the conductor is a 250 MCM ionductor and leavesthrough wall oppositeits removahleterminal? (c r r
a)
4 inches
b)
4 1/2inches
c)
5 inches
d)
6 1/2 inches
Elecfrician Practice Test No. 12 ANSWERES #1 c (36 inches)The lengthof the cord shallnot be lessthan 18 in. (457 mm) andnot over36 in. (9I4 mm). Text ReferenceSection 422-16(bXlXb) #2 a (300watts)Screw-shelllamp holdersshallnot be usedwith infraredlampsratedover 300 watts,unlessthe lampholdersare identifiedasbeing suitablefor usewith infraredheatinglamps ratedover300 watts.Text ReferenceSection422-48(b) #3 d (All of the aboveif the circuit breakeris listed) #4 c (30 amperes)If the overcrurentprotectionrating is not not exceed markedandthe applianceis ratedover 13.3amperes, ratedcturent.Where150percentof 150percentof the appliance the applianceratingdoesnot correspondto a standardoverculrent Section422-I1(e)(3) deviceampereTextReference Cablesi 424-34. #5 a (7 feet)PartE. ElectricSpace-Heating HeatingCableConstructionHeatingcablesshallbe furnished non heatingleadsat least7 ft completewith factory-assembled (2.13 m) in length.Text ReferenceSestionArticle 424 part E Section424-34 Section424-35 #6 c (red)Text Reference #7 b (2 inches)Wking locatedaboveheatedceilingsshallbe spacednot lessthan2 n. (50.8mm) abovethe heatedceilingand shall be consideredasoperatingat an ambientof 50oC(122"F). Text ReferenceSection424'94
I
#8 a (8 inches)Heatingelementsof cablesshall be separatedat least 8 in. (203 rrun) from the edgeof outlet boxesandjunction boxes that areto be usedfor mounting sudacelighting fixtures. A clearanceof not lessthan 2 n. (50.8 mm) shall be providedfrom recessText ReferenceSection 424-39 #9 a (1 V, inches)Adjacentrunsof cablenot exceedng23/t watts/ft (2%watts/305mrn) $hallnot be installedlessthan l% n. (38 mm) on centers.Text ReferenceSection424-41(b) # 10 b (20 alrrperes)The ampacityof the branch-circuitconductors and the rating or settingof overcturentprotectivedevices equipmentconsistingof supplyingfixed electricspace-heating resistanceelementswith or without a motor shallnot be lessthan 121%0 of total load Text ReferenceSection'424'3(b) # 1I d (The chief electricalinspector)Text ReferenceSection90-4 #12 c (eight)In straightpulls, the lengthof the box shall not be lessthan eighttimesthe tradediameterof the largestraceway. Text ReferenceSection370-28(a)(1 ) #13 a (Il4 inch)Metalplugsor platesusedwith nonmetallicboxes at leastY4n. (6.35mm) from or conduitbodiesshallbe recessed the outer surfaceof the box. Text ReferenceSection370-18 underplaster)Text ReferenceSection #14 b (Concealed 352-1 for metallic and352-22for non metallic #15 c (314inch)Half-ror:ndandflat-topracewaysnot over 4 in. (102 mm) in width shallhavenot lessthan% n. (19 mm) of concreteor wood abovethe raceway.Text ReferenceSection 354-3(a)
:
'
#16b (On eithersideof the boundary)In eachconduitrun leaving a ClassI, Division I location.The sealingfitting shallbe permitted on eithersideof the boundaryof suchlocationwithin 10 ft (3.05 m) of the boundary.Text ReferenceSection501-5(a)(a)
t..
#17 d (1/4 inch)In walls or ceilingsof concrete,tile, or other material,boxesshall be installedso that the front noncombustible edgeof the box will not be setback of the finishedsurfacemore than % n. (6.35mm). Text ReferenceSection3T0-20
t,.i
#18 c (36 inches)Text ReferenceSectionI I0-26(a)andTable
rr0-26(a)
t.
# 19 b Otro.4) Whereracewayscontainingungroundedconductors No. 4 or largerentera cabinet,box enclosure,or raceway,the conductorsshallbe protectedby a substantialfitting providinga smoothlyroundedinsulatingsurface.....Text ReferenceSection 300-4(f) in Table #20 d (6 % inches)Reducethe 8 Il2 inchrequirement 373-(b)by two inchessincethereis a lay in terminal.Text ReferenceSection 373-6(b(2)andTable373 -6(b)with notes
t.,
Electrician Practice Test No. 13 l.
(tat is the minimum number of receptacleoutletsrequired in thefollowing aurgrunL
,^b)
6
{*
c)
7
r d )
8 10 ft|1-}1 2lL
3fr zfr
J+" r t
S-, "
-av
2fl 4fL
sit. efr,iF
Livirrg Room 94 it. x 17 ft.
19 ft.
lzrt
g
-L
The rules arefoundin Section210-52.Note: Thesearethe minimumnumberof receptacles. Receptacleoutletsrequiredby Section2lO-52for a living room shallbe in additionto any rlceptacle that is part of a lighting fixnue or appliance,locatedwithin cabinetsor cupboards,or locatedmorethan sYrft.(1.68m) abovethe floor.
ln every living room receptacleoutlets shall be installed in accordancewith the general provisionsspecifiedin (l) through(3). in any wall it) Spacing.Receptaclesshall be installedso that no poinl alongthe floor line that space. in an.outlet rp."" is moretlan Oft (1.S3m), measuredhorizontally,from Iieceptacle outlets shall, insofar as practicable,be spaced:qt4 $t*._":. apart. (2) WaU Space.As usedin this section,a wall spacesball includethe following: aroundcorners) u- a"y tpJr. 2 ft (610 mm) or more in width (including spacerneasured and r:nbiokenalongthe floor Lineby doorways,fireplaces,and similar openings b. The spaceoccupiedby fixed panelsin exteriorwalls, excludingsliding panels
2.
What doesthefoUowing drawing represent? c a )
Cr:rrenttrnnsformewr
r b )
Auto transformer
r c )
Single-Phasetransformer
' d )
Threephasetransformer
2 A 50 voll generator which b driven by a singlc motor is protected by the Jo or"rrurrint deviceprotecting the motor only when the generatoris delivering no more than whatpercent of itsfull'load rated current?
r (-
(-
a)
100percent
b)
125percent
c)
150 percent
r d )
4,
t
80 percent
The overcunentprotectionfor conductorsshall not exceedhow many ampereswhen the control circuit conductorfor the motor ls.l{o. 12 AWG coryer and do not utend beyondthe motor control enclosure?
)
l;'
c t
r r
I
€;
a)
100'mPeres
b)
120amPeres
c)
60 a:nPere
(-
20 amperes d) what is the minimum number of overload uniF in a threephase J. Generally, motorT ' a )
One
. b )
Two
c) . d )
Three None
protection rating b not marked and the applianceis rated tt u' If the overcurrent i3.3 o^ptres or lessthe branch-circuit rating of a non-motor operated applianceshall have a minimum rating of what? (' (^ C {-
a)
150percentof the full load rating of the appliance
b)
100percentof the full loadratingof the appliance
c)
20 arnperes
d)
30 amperes
7,
A cutout box installed in a wet location shaA be what? r {r
a)
Rain tieht
b)
WeatherProof
c)
WaterProof
r
n vr
RainProof d) A junaion box used in a systemrated 1,000 vola shall have a marHng on it of whot? r rr
a)
DAI'{GER
b)
HIGH VOLTAGE
c)
KEEP OUT
f
O '"
DA]\rcER - HIGH VOLTAGE - KEEP OUT d) A nonmetallic wireway and metal wire way cannot befilled to more than 20 percent of their crosssectionalarea..Wot is the maximunt number of current carryi4g conductors allowed in a metal whe way when no derating is required? ra)
80
r
b)
50
c) .-d)
30
r
Lt O v'
20
Metot surface racewayshaving splicesand taps shall bepermitted as long as the splicesaltd tops,and conductorsdo notJill the racewaymore than how muclt of the area of the racewayat that point? r* r (^ c
a)
40 Percent
b)
75 Percent
c)
50 percent
d)
60 Percent
t
:
t -
l t fI
72.
Panelboardshaing an approvedsyrtem of organic cootingsand are installed outoJEflssn sholl be narked in which manner? r a )
Weatherproof
(-
b) c c )
Rain tieht
(-
Outdoorusage
d)
Watertight
An effectivegroundedpath requires which of thefollowing? (-
t .
a)
A solid metallic object
r b )
The ability to conductfault-current
c c )
An energizedsource
(-
| ? L^
Sufficientlow impedanceto limit the voltageto ground d) Equipment installed and likely to becomcenergizedshall be grounded at which of thelottowing distances? 8 feet horizontaland 5 feet vertical of groundedmetal objects, 5 fee vertical and 5 feet horizontalof gror:ndedmetal r b ) objects 8 feet vertical and 5 feet horizontalof groundedmetal 1 . c) objects 8 feet vertical and 8 feet horizontalof groundedmetal (* d) objects Circuit breakerswltich ore tued to satitch120 vollfluorescent lights on an off shalt be marked with wha listing? c a )
t.,
I
8r
1t d"
c a )
U.L. approved
r-
b) r c )
RMS 5,OOO
c d )
10,000RMS
SWD
t S According to the NEC, semice-entrance conductorc are protecied by a L' circuit breokerif It hashow many times the ampacily of the conductorfor ia fiip settkg? (Short circuit protection) c (' (^
a)
3 times
b)
5 times
c)
6 times
r
L| 6 '"
8 times O Wtat is tlrc snullest size of semice-entrancecopper conducton permited when installed in a non-metallic raceway when supplying three single branch circuit loads in s comrflercial building.? r c r r
77.
a)
No' 10
b)
No'8
c)
No'6
d)
No'4
Whenshall the ground-fault protection systembe tested? c c r
a)
When it is installed
b)
When it is manufactured
c)
When it is insPected
c
IR 1v'
When it is energizedfor the first time O Hnat ii the muimwn time of delaypermittedfor afeeder disconnectrated fu00 amperesor more on a solidly gyoundcd'vryeelecfrcal systemof more than 150 volb to ground, but not uceeding 600 voltsphase-t*phase, that is NOT (1) a continuous industrial processyhgre a orderly shutdown will introduce additional or increasedha2ardi, and (2) is also notfor aJire pump, and (3) doesnot have a groundfault protectedservice ? '-a)
1/2second
c b )
lsecond
r c )
3 seconds
r d )
100milliseconds
Ig.
What is the minimum sizerating of a 240/120volt singlephaseserttice entrance conductors supplying a singlefamily dwehing having 1200 square feet of living spaceand a net computedload of 4800KA? r*
t'
c c
a)
100amperes
b)
200 a'rnPeres
c)
60 amPeres
'
)n -v'
3o amPeres d) Given a singtefamily residenceH,itlt a general lighting load of 22,500 watts. Wtat is the demandlighting loadJor the residence? r rrr
L
f :
L .
a)
22'500
b)
19'5oo
c)
6'825
d)
9'825
ElecfricianPracticeTestNo. 13 AI\SWERES Sectionzl0-52 #I a (7) TextReference 10 ft.
i<+t I etr
T't . n
4ft
I rf,
Uving,loom 94 ft. r 17 ft.
4fr Closet
#2 b (Auto transformer)
#3 c (150)Generatorsoperatingat 65 volts or lessand drivenby individual motorsshall be considerediuiprotectedby the OCPD protectingthe motor if thesedeviceswill operatewhenthe generatorsare deliveringnot morethan 150percentof their FLA. Text ReferenceSection M5-4(c) #4b(120) 120amperesin ColumnB of Table 430'72(b)Text ReferenceSection430-72(b)ColumnB #5 c (Three)3, one in eachphaseText ReferenceSectionTable 432-37 #6 c (20 amperes)If the overcrurentprotectionrating is not marked or less,not exceed20 andthe applianceis rated 13.3Ernperes amperes.Text ReferenceSection422-11(e)(2) #7 b (WeatherProof)Enclosuresinstalledin wet locationsshallbe weatherproof.Text ReferenceSection 372-3(a) #8 d (DANGER - HIGH VOLTAGE - KEEP OUT) Coversfor boxes shallbe pennanentlymarked*DANGER - HIGH VOLTAGE - KEEP OUT* Text ReferenceSection3T0-72(e) #9 c (30) Metal wirewaysshallnot containmorethan 30 currentcarrying conductorsat any crosssection.Text ReferenceSection 362-5 #10 b (75%)Splicesandtapsshallbe permittedin surfbcemetal racewayshavinga removablecoverthat is accassibleafter installation.The conductors,includingsplicesandtaps,shallnot fill the racewayto morethan 75 percentof its areaat that point. Text ReferenceSection352'7 installedin wet locationsshall # 1I a (WeatherProof)Enclosures be weatherproof.Text ReferenceSection384-2 and373-2(a)
#l2b (The ability to conductfault-current)The fault currentpath shallbe permanentand electricallycontinuous,shallbe capableof safely carryingthe likely maximum fault culrent. 250-2(il Text ReferenceSection250-110 a. ,'
C
#13 c (8 feetverticaland 5 feethorizontalof groundedmetal objects)Text ReferenceSection250-1l0
r
#14 c (SWD)Circuitbreakersusedasswitchesin 120-voltand 277 -volt fluorescentlighting circuitsshallbe listedandshallbe marked*SWD.* Text ReferenceSection240-83(d) t ;
not to exceed amperes #15 c ( 6 times) A fuseratedin continuous threetimesthe ampacityof the conductor,or a circuit breakerwith a trip settingof not morethan six timesthe ampacityof the conductors,shallbe consideredasprovidingthe requiredsc protectionTextReferenceSection230-208
a,-
: ,j
means #16 b (No. 8) Minimum sizeis basedon disconnecting minimum sizeof 60 amperesand60 degreeampacitiesin Table andby 310-16.No. 6 hasa 60 degreeampacityof 55 amperes 230-90(a)ExceptionNo. 2 allowsthe next largerstandardsize 230Section230-42(b), Text Reference OCPD of 60 amperes. ExceptionNo.2, 240-6,and 79(d), 110-t4, i30-42(a),230-90(a) 240-3(b) #17 a(when installed)The gound-faultprotectionsystemshallbe performancetestedwhen first installedon site.The testshallbe that shallbe provided with instructions ionductedin accordance Section230-95(c) Text Reference with the equipment. protection settingof theground-fault #18b (1 Second ) Thema:cimum timedelayshallbeone andthemaximum sha[ be 1200amperes, than3000amperes. equalto or greater currents secondfor grouna-Autt Section215-10thatrefersto 230-95(a) TextReference
#19 a (100 amperes)For a one-family dwelling, the service discorurectingmeans shall have a rating of not lessthan 100 €rmperes,3-wire. Text ReferenceSection23042(b) andsection23079(c)that requiresfor a one-familydwelling,the senricedisconnecting meansshallhavea rating of not lessthan 100amperes,3 wire #20 d (9,825)First 3,000va at 100percent,the remainderat 35 percent. SectionTable 3,000+ .35(22,500- 3,000):9,825 va TextReference 220-3(a)for 3 valsq. ft. and table 220-l I for the demandfactors
\; :
Electrician PracticeTestNo. 14
t : l
t.;
I For Interlocked-Type Armor or Corrugated Sheath TypeMetal Clad Cahle 'L' bends shallbe madeso that the cablewill not be damaged,and the radius of the curve of the inner edgeof any bendshall not be lessthan shown in:
tr.:
r-
the externaldiameterof the metallic a)
L J
c \,,
-')
the externaldiameterof the metallic b)
}".""ff* timesthe externaldiameterof the metaliic
r
ca
ffJ"?.d-"s
c)
il:|il: Fifteentimesthe externaldiameterof the metallic r' d) sheath kilowattload with a.8 powerfactor draw How many amperesdoesa 831100 in a 480volt, threephase circuit? (' c r
a)
100amperes
b)
125amperes
c)
1250amperes
r
? Jt
1,000amperes d) Insinsthe DC resistancemethodwhat is the Voltagedropfor a No. 12 copper soliiconductor usedon a two wire 120 volt circuit that is 200 long one-way and draws12 amperes?Selectnearestanshter. r-
CJ
r -
a)
12.3volts
b)
6 volts
c)
9'3 volts
a
*...
t. ::
Not enoughinforrration to find the answer. d) /t lVhat is tlrc moximum ratingforfastened in place cord'and plug-connected To ufifity equipmentthat can be installedon a 20 amperecircuit if the circuit also snpplieslighting outletsT r a )
20 amperes
a
16a:nperes
b)
'l
12amperes
c d ) S J'
6 v'
j t'
10 amperes
What b the maximum cord andplug connectedload to a receptaclcrated 15 amperesand iwtalled on a 20 ampere circuit?
c a )
20 amperes
r b )
l6 amperes
r c )
12 amperes
r d )
10 amperes
What is the maximum size circuit rating permitted when using a duplu receptaclewhich is rated at 20 amperes?
r a )
20 amperes
r b )
l5 amperes
.-c)
l6 amperes
,-d)
10 amperes
What is the rtnimum load allowedfor each 2-wire laundry branch circuit installed in a dwelting?
r a )
2,400volt-amperes
(*
b) r c )
2,000volt-amperes
c d )
1,500volt-amperes
1,800volt-amperes
the exact location of the installed circuit are .g v' Drawings designedto show commonly referred to as a?
r a )
Blue print
r b )
Schematicdiagrant
c c )
As-build drawing
c d )
One-linedrawing
(-
red-linedblue prints
e)
L i
L ,
O '/'
t.,
Wot is the honqtower output of a 75horsqower, threephasemotor wilh a 85% efificicncyand a.80 powerfactor {the voltogeis 230 wlts and the motor draws 194 amPeres? c a )
60 Horsepower
r-
b)
70 Horsepower
c) r d )
80 Horsepower
(-
'" rt n
L-j
90 Horsepower
Given 5 rangeswith thefollowing loads: 6 Kva,4.5 KvarS Kva' 3.5 Kva and 4 Kva. Wat is the minimum computedloadtor thesehouseholdrang6 when all are connectedto onefeeder?
*,J
(t ;
a)
26 Kva
r b )
20 Kva
r-
1 1 . 7K v a
c)
r
l6'2Kva d) two 400 amperc 480voltr S-phaser4-wirepanels connectedby one 'rI 'I ' Given neutraL Mrat percent of the neutral load must be takenfor theftrct 200 amperes?
r a )
70 percent
{-.
b)
125percent
c)
80 percent
L,-
rI
;
r
Ej
r| -')
100Percent d) The minimum vertical distancefrom groundfor service-dropconductors ratud240,Voks,ond running over a public drive-wayshall be?
^)
' b )
18feet
c)
15 feet
(_
ti
a,
10 feet
1.2feet d)
| ? -"'
It is permissibte to install l|feet semice entrance conductorc in all olthe lollowing ucept? i^ a (-
a)
Electrical metallic tubing
b)
lntennediatemetal coaduit
c)
Flexible metallic conduit
r
zugld metallic conduit d) t ,t Yhere the sewice dbconnecting meonsdoesnot disconnect the grounded rao conductorfrom the premiseswiring, you must irrstoll which of the following: t r r
a)
A disconnectinglink,or terminal
b)
A bondingbushing
c)
A groundingbushing
r-
LI r'S
An additionalgroundrod d) llhich iruulation can be usedfor conduc'torsin (1) racewaysused out of doorc, (2) in rucewtrysin concrete slabsindoorc, and (3) in racewaysthat are directly buried in earth (. r r
a)
THHN
b)
RHH
c)
)C{HW
c
^| 6 v'
RH d) Mtat b the synchronousspeedin RPM ota motor with eightpoles when connectedto a 100 hertz supplY? r c r
(^
a)
12'000RPM
b)
6'000RPM
c)
3'000RPM
o
1200RPM
7 7. A megger is usedto measure:
r a )
insulationbreakdownresistance
r b )
resistance
r c )
resistanceof groundrods
..d)
all of the above
a Given four parallel 500kcmit KIHWCLI with a 1 each 100 kcmil neutral -r7nc condicfors'perphase run in 4 each metal condui&. What should the conJiguration bePer each conduil ' a )
r b )
A-phase,B-phase,C-phase,Neutralin each conduit. in one conduit"BBBB in one conduit" A,rAr4,r{ in CCCC one conduitNNN in one cooduit.
c c )
Doesn'triratter.
,-d)
Noneof the above
generol the minimum sizeconductorsthat can be usedfor up to 2,000 Lt 'A' In voftsfor power and lighting are: a)
No. 18 copper,No. 14 aluminum
c b )
No. 14 copper,No. 12 aluminum
. c )
No. l8 copper,No. 16aluminum
{-
Given three (3) 300kcmil THWN Cu conductors in (3) setsbeing utilized as 20. semice-entrance conductors,Mrat is the minimum sizefor the copper grounding electrodeconductor? fs.i
a)
No.2
b)
4t0
c)
U0
d)
210
I
f i-
t i i
t ;
'
Electrician PracticeTest No. 14
i
A|ISWERES
r.
#t a (Seventimesthe externaldiameterof the metallicsheath.) Text ReferenceSection334-L1(b)
L: I t-,
Power(watts): SQRT3x Volts x Amperesx #2 b (125amperes) PowerFactor,Amperes- Power/ (SQRT3 x Volts x Power Factor);Amperes:83,100/ (I.732x 480x.8); Amperes- 125 amperesText ReferenceSectionThreePhasepowerformulain BasicTheorypage
r.; r. , f
\
. ,. , u; t
t::
r ,
x.193 : is (400/1000) #3 c (9.3)FromTable8 TheDC resistance 0372; The voltagedropis 12 amperesx0.772 - 9.3volts #4 d ( l0 amperes)The total rating of utilizationequipment fastenedin place,otherthanlighting fixtures,shallnot exceed50 percentof the branch-circuitampererating wherelighting units are also supplied.Text ReferenceSectionTable210-24andSection 210-23(a) to a branchcircuitsupplying Whereconnected #5 b (16 amperes) or outlets,a receptacleshallnot supplya two or morereceptacles load in excessof the ma:
#8 c (As-build drawing)Text ReferenceSectionBasedon experience. ) : 1 . 7 3 2 x 1 9 4 x 2 3 0 x . 8 5x . 8 / 7 4 6 ; # 9 b ( 7 0H o r s e p o w ehr p hp : 70.4Text ReferenceSectionBasicElectricalTheory #10 c (11.7Kva) From ColurnnC demandfactoris 45%; .45 x (6 + 4.5 + 8+ 3.5 + 4) : lL.7 kva Text ReferenceSection 220-L9and table 220-19 #1 1 d (100percent)The feederor serviceneutralload shallbe the maximum unbalanceof the load determinedby this article. Text ReferenceSection 220-22 alleys,roads' #l2b (18 feet) l8 ft (5.49m) - overpublicstreets, parking areassubjectto tuck haffic, drivewayson otherthan residentialproperly,andotherland suchascultivated,graa;krg, forest, andorchardText ReferenceSection234'24(b) # 13 c (Flexiblemetallic conduit)Flexiblemetalconduitnot over 6 ft (1.83 m) long or liquidtieht flexible metalconduitnot over 6 ft (1.83 m) long betweenraceways,or betweenracewayandservice equipmentis allowed.Text ReferenceSection230-43 #14 a (A disconnectinglinhor tenninal)Wherethe service disconnectingmeansdoesnot disconnectthe groundedconductor from the premiseswfuing,othermeansshallbe providedfor this Text ReferenceSection230'75 puqposein the serviceequipment. # 15 c ()C{HW) Insulatedconductorsandcablesusedin wet locationsshallbe MTW, RHW, RHW-2, TW, THW, THW-2, THHW, THHW-2, THWN, THWN-2, XFIHW, XF{HW-Z,ZW Text ReferenceSectionDefinition of location-Wet in Article 100 and
[;
I t
.
t "
L;
#16 b (6,000RPIO SyncRPM: (hertzx 120)/ Numberof Poles; SectionBasic SyncRPM - (400 xl20 )/ 8:6,000 TextReference ElectricalTheory #17 d(all of the above) However,meggersareusuallyusedto measureinsulationbreakdownresistance.
[.,
t,
LJ
#18 a (A-phase,B-phase,C-phase,Neuhal in eachconduit.)The requirementto run all circuit conductorswithin the sameraceway, auxiliary gutter,cabletay, trench,cable,or cord shall apply separatelyto eachportion of the paralleled installation.Text ReferenceSection300-3(bX1) #19 b (No. 14 copper,No. 12 aluminum)The minimumsizeof conductorsshallbe asshownin Table310-5.Text Reference Section310-5,Section310-5 #20 d (2lo)3 x 300- 900kcmil; perTable250-66900kcmil requiresa2l0 coppergounding electrodeconductor.Text ReferenceSection 250-66andtable 250'66
L ,
t.i
A.;
Electrician PracticeTest No. 15 I,
l .
Mtat is the maximum temperaturerating permittedfor TW wire?
I
r a )
140degreesC
(-
b)
60 degreesC
c)
75 degreesC
d)
167degreesC
l . ; 1 .
'I
r()
: :
Mtat is the mnximum sizefuse allowedon a No.12 THHN CU conductor?
s;
3.
4. r.j
c a )
20 amperes
r b )
15 amperes
c)
25 amperes
r d )
30 amperes
In general,the smallestpermbsible copperservicedrop conductoris No. I ' a )
True
c b )
False
A 200Ampere overcurrentprotectivedevicereuires a No. equipmentgro unding conductor.
r-
/
f
?
a
)
2
b
)
4
c)
6
c
5.
8 d) Flsibte Metal conduit not supportedfor 3feet and usedto provide grounding ltuibility at equipmentshall be equippedwith an equipment conductor. (-
(-
^)
True
b)
Faise
6 v'
For a high impedancegrounded systemthe neutral cannot be smaller than No.-Copper. c
b c
8
a) )
6 4
c)
c
^7
2 d) Amperes to A n0n40 Vfeeder shall have a rating of at leost load continuous ln'a supply a 9 lcr'anoncontinuou load and a 12 c rr
8.
a)
87'5 amPeres
b)
loo amPeres
125amPeres c) Any availahlewall spacein a dwelling shall be within 7' of a plug recePtac14 r
a)
True
c
q "
False b) Switchenclosuresand panelboards,under certain conditions,may be used asjunction boxes. c
a)
True
c
I0.
False b) Ihnderyelain conditions,a 20' length of metal racen'oyneednot be grounaetu c r
a)
True
b)
False
7' r t.
I
I 1.,
L,
t.i
[-
a:"
which is the correct hookup conligurationfor a solidly groundqd Delta wve 1E0vok to 20s/120volt transformer shown below? {-a)
A
i_b)
B
c c)
c
!t z')
Conductors otdissimilar metals shall not be intermixed in o terminal or splicing connector wherephysical contact occuis, unless the deviceis for the purPoseand conditions of we. r f-
a)
[sted
b)
identified
r
hbeled c) t ?' The semicedisconnectingmearutmay consistof not more than six switches 1r or chcuit hreakers. r
a)
True
c
z| /"
False b) For dwelling uni6 the serviceorfeeder demandcapacitynecessaryforfour I0 kw electricranges is -kw. c (r
a)
15
b)
t7
c)
19
r
2l d) t S Wttich diagram showsthe conecl connectionfor three start stop stations -:' for a motor controller. The diagramsdo not show the holding contacts. c a )
A
(-b)
B
c.
c
c)
A rI u'
The clearanceof 120/240 V semicedrop conductorsover residential drivewaysnot subjectto truck traffic shatl be no lessthan -fL ('
t .
L J
a)
10feet
r b )
12 feet
{*
c)
15feet
c d )
18feet
at 20,000vA of computedload in a hotel shall be assessed 7 7. Thefirst percent. r^
E.:
a) c b )
30
('
c)
50
a)
CoPPer
b)
Aluminum
40
conductorsusedto carrycurrentshall beof speciJied, I B. Unlessotherwise c -
,-c)
rL.. i
Bronze a 350kcmil, 120/240V
coppergrounding electrodeconduclorfor 1 9 .The serviciiurtiilotion, ii rrn to a ground rod electrode,shall be no smaller than No. *,
(_a)
6
r
4
I
b) c c )
t.-
li! l,
)n ztt'
The smallestpermissibteLISTED driven ground rod electrodemadeof inchesin diameter' nonferrousmaterialstL(-
L,,
1.;
2
a)
3t4
r b )
s/8
' c )
u2
Electrician PracticeTest No. 15 A1\SWERERS c) 60 Degreesper Table310-13.Text Reference # I b (60 degsees Section310-13andTable310-13 unless specificallyperrrittedin (e) through(g), #2 a(20 amperes) piotection;hail not exceed15 amperesfor No. 14, the overc1llrent forNo. 10copper;or 15 in ^ p"I:esforNo. 12, and30amperes forNo. 10 aluminumand amperlsforNo. lZ and25 anryeres copper-cladalurnText Referencesection240-3(d) #3 a(tnre) Minimum Size.The conductorsshallnot be smaller thanNo. 8 copperor t{o. 6 aluminumor copper-cladaluminum. Text ReferenceSection 230-23(b)
#ac (6) #5 a(true) where usedto connectequipmentwhereflexibility is required,an equipmentgfoundingconductorshallbe installed. Section350-14(ref:Section350-18Exception Text Reference No .2 #6 a(8) In no caseshalltheneutralconductorbe smallerthanNo' 8 copperor No. 6 aluminumor copper-cladaluminum'Text ReferenceSection250-36(b) va+ 9,000va:24,000va; 1.25x 12,000 #7 b (100amperes) Section Text Reference 24,0d0va/ 240volts: 100amperes 2t5-2(a)
shall be installedso that no point alongttre #8 b (false)Receptacles floor line in any wall spaceis morethan 6 ft (1.83m), measured horizontally,frbm an outretin that space.Text Referencesection
2r0-52(ax1) #9 a(tnre) Enclosuresfor switchesor overcurrentdevicesshall not be usedasjunction boxes,auxiliary gutters' or racewaysfor conductorJfeedingthroughor tappingoff to otherswitchesor overcrurentdevicJs,unlessadequatespacefor this purposeis provided.Text Referencesection380-3(b),and373-8 # 10 a (true)Shortsectionsof metalenclosuresor racewaysusedto from physical provide supportor protectionof cableassemblies lu-ugr straitnot ba requiredto be grounded.Text Reference No. 1,2 and3. Section250-86Exceptions # 1 1b f t )
not be #lzb (identified)conductorsof dissimilarmetalsshall physical intermixedin a tenninalor splicingconnectorwhere unlessthe deviceis contactoccursbetweendissimilarionductors identifiedfor the purposeandconditionsof use'Text Reference Section110-14 per seryice #13 a(tnre)Thereshallbe no morethansix disconnects groupedin any onelocationText Referencesection230-71(a) a
.
ranges #l4b(l7) ColumnI of Table220-19shows17kw for 4 220-19 not over 12 kp each.Text ReferenceSection220-L9,Table Colurnnone. the start # 15 c ( c ) The stop stationsare connectedin serieswith stationsandthe startstationsareconnectedin parallel' A
!
L1
B
#16b (12 feet)12ft (3.66m) driveways.C 230-24(b)
properfyand overresidential
#t7 c (50) Text ReferenceSectionzz}-l I andTable220-ll #18 a (copper)Conductorsnonnally usedto carry cwrent shallbe of coppei,tolessotherwiseprovidedin this Code.Wherethe condu;tor materialis not specified,the material and the sizesgiven in this Code shatlapply to copperconductors.Text Reference Section110-5 #19 a(6) Wherethe groundingelectrodeconductoris connectedto madeelectrodesaspermittedin Section250'52(c)or (d), that portion of the conductorthat is the soleconnectionto the GEC strattnot be requhedto be largerthan No. 6 copper.Text ReferenceSection250-66andsection250-66(a) #20 c (ll2) nonferrousrods,or their equivalentshall be listedand shallnot be lessthan % in. (12.7mm) in diameter.
Electrician PracticeTest No. 16 rtI
-')
Each commerciatbuitding and occupancyaccessibleto pedestriansslrall be outletfor signor outline lighting. This provided -outlet with at least one accessible shall not supply any other load and shall be rated no lessthan -, and the load shatt be computedat a minimum of -volt-amperes. r a )
15amperes , 1200
c b )
1500watts,1500
c c )
1200 20 arnperes,
r d )
1500 30amperes,
In theJield, it is not permissibleto connectfusesor circuit breakersin parallel. a) i_
'?
b)
True False
gallons ofJlammable liquid shall Capacitorsthat contain more than be enclosedin a vaul6 or outdoorfencedenclosure.
r a )
1
(-
z
(-
b) c)
1
c
4 d) /t A srounded circuit conductorshall NOT bepermitted to ground noncurtentao ca-rryingmetal partsof equipment,raceways,and other enclosuresat whiclt of thefollowing locations r^
^)
' b )
t
.
c)
' d )
Serviceequipmenton the supplysideof the service means. disconnecting On the supplysideor withiq the enclosureof the main disconnectingmeansfor separatebuildings On the supplysideor within the enclosureof the main meansor overcurrentdevicesof a separately disconnecting derivedsystem RangesandDryerson the loadsideof tlie service means. disconnecting
j.
Generally, when driving a ground rod into the ground which of thefollowing appry:
r a ) r b ) ((-
The upperend of the groundrod shall be driven to below gradelevel. The upper end of the gror:ndrod may be driven to below grade or flush with gradebut the connectionto the grounding electrodeconductorshall be accessible.
c)
The upperend of the groundrod shail be flush with grade.
d)
The upper end ofthe groundrod shall be abovegradelevel.
The Life Safety Branch of a hospital emergencyekarical systemshall 6. 6. suoolv oower for
r a )
Illuminntionof Meansof Egress
r b )
Exit Signs.
c c )
AlarmandAlertingSystems.
r
CommunicationsSYsteins.
d)
r
All of the aboveand power for the generatorset and elevator. e) systenqthe critical bronch of the EmergencySystem 7 ' ' In a hospital electrical shallsupptypowerfor all thefollowing with the exceptionof -.
r a )
Powerfor task illumination, fixed equipmen! selectedreceptacles, and specialpower circuits servingthe following areasand functions relatedto patientcare.
r b )
Nursecall systems
r c )
Blood, bone,and tiszuebanks
' d )
Three-phasemotorsusedfor the supplywater.
' e )
Single-phasefractionalhorsepowermotors shallbe permittedto be corurectedto the critical branch.
t
g.
Anxilia.ry g:tters are permitted to contain all of the below with the excePtwnof -r r r {-
9.
r 'r r
10.
overcurrentdevices'
b)
conductors
c)
busbars
d)
sPlicedconductors
An insulatedconductor usedin a switchboardshall be r
.:.
a)
a)
listed
b)
flame retardant
c)
ratednot lessthanthe voltageappliedto otherconductorsor busbarswith which it may comein contact.
d)
All of the above'
A threephase 480volt air conditionershall be connected (. r ('
b)
directly to the premisewiring systemusing an acceptablemethod from Chapter3. with a 3-prongattachmentplug and flexible cord
c)
with a 4-prongattachmentplug and flexible cord
^)
('
with flexible cord andplug is not over 4 feet long' d) Class2 circuils can be instuAedin the samecabletray as t't r't o Cabtescontaining power and lightiig cablesrated 6oo voltswithout a partition if the Class2 circuit cablcsare r (* (' r
^)
b) c) d)
PLTC CL2 Metal-Clad CL3
rt -')
Lt '?
^| /"
What is the rtnimum working space WIDTH k front of equipment operating at 120 volts AC containingfwes or circuit breakersthat may be serviced while energized.
c a )
3 feet
r b )
30 inches
r c )
4 feet
r d )
None of the above
In general the maximum length that 3/8 inchJlexiblc mctal conduit that can be made up in theJield it -. c a )
3 feet
r b )
4 feet
c c )
6 feet
c d )
None of the above- thereis no maximumlength.
If structural mcmbersare on 5feet centersEMT can be supported feetifrom a box instead of within 31feetwhen the EMT is runfrom a box to a structural member and there is no other method to readilyfasten the EMT within 3feel. '
"
)
4
'
b
)
5
t
.
)
6
S Switchesan circuit breakersusedas switchesshall be installedso that the 1I e' abovethe centerof the grip of the operatinghandle is not more than platform. working or floor (-
r f i-
a)
6 feet 7 inches
b)
6 I/2 feet
c)
5 feet
d)
4 feet
1| 6 v'
Wherethe cbcuitry is interlocked so as to prevent operation of selected mobrc or other loadsat the sametime, the branch circuit conductor ampacity shall bepermitted to be basedon -.
125percentof the largestmotor full arnperesplus the strmof the a) othermotorsfirll load currents. the summationof the currentsof the motorsandotherloadsto be r. b) operatedat the sametime that resultsin the highesttotal curent. r c) 125percentof the sumof all the loads. groundedconductorlarger than No. 6 shall be identified by -| 7 ' ' An insulated (Selcctthe bestanswer) -. r
r (' lA
('
^)
a continuouswhite or natural gray outer finish or by three continuouswhite stripeson otherthan greeninsulationalongits entirelengthor at the time of installationby a distinctivewhite marking at its terminations.
b) By taggingor othereffectivemeans. c)
By paintingthe terminalsand spliceswhite.
r
^t R v'
d) By applying graytapeto the exposedareasof the conductors The requirementsfor attachmentsplugs and cord capsshall conform to one or more of thefotlowing. Selectthe bestanswer. (. r
r
r rr'
No receptacleshall be installedso asto requirean energized a) atbchmentplug as its sourceof supply. - - Attachmentplugs shallbe installedso that their prongs,blades,or b) pins arenot energizedunlessinsertedinto an energizedreceptacle. cord connectors,and attachmentplugs shall be Receptacles, constructedso that receptacleor cord connectorswill not acceptan c) aftachmentplug with a differentvoltageor currentratingthanthat for which the deviceis intended;ex. for 20A T recept. -. Nongrounding-typereceptaclesandconnectorsshallnot accept tl) grounding-typeatiachmentplugs. e) All of the above
of a recessedJirture turrtnal 'I "O An outlet boxfor the tap conductor the connection shall heplaced at a minimum distanceof -from frxtura f r r
a)
4feet
b)
18 inches
c)
1 foot
r
)n -v'
None of the above 61 When liquidtightflexiblc metal conduit orflexible metal conduit are instatledas aftxcd racenay, they shall be SECTIREDat intemalsnot exceeding4 1/2feet and within 12 inches on eachside of everyoutlet box orfifring. Are tie wraps suitable to secaretheseraceways? r r c r
a)
Yes, if acceptableto the authorityhavingjurisdiction
b)
Yes, if aPProved
c)
Both A and B
d)
None of the above;tie wrapscannotbe used.
a ,
Electrician PracticeTest No. L6
..
ANSWERES
,.,
#I c (20 amperes,1200)TextReferenceSeotion600-5(a)and(b) #2 a (true)Text ReferenceSection240-8
: .
(. ..
.
#3 c (3) Capacitorscontainingmore than3 gal (11.36L) of flarnmableliquid shallbe enclosedin vaultsor outdoorfenced enclosures: Text ReferenceSection460-2(a)
r l
r. c \.j n , . t:)
#4 d (RangesandDryerson the load sideof the seryice Section250-A2(a) means.)Text Reference discorurecting #5 b (gradebut the connectionto the groundingelectrode Generallyspeaking,flush or below conductorshallbe accessible.) is the correctCoderule. Thereareexceptionssuchas for concrete encasedgroundrods.TextReferenseSection517-32 #6 e (All of the aboveandpowerfor the generatorsetand Section517-32 elevator.)TextReference motorsusedfor the supplywater.)Only single#8 d (Three-phase phasefractionalhorsepowermotorsarepermitted. Text Reference Section517-33
t. .
$
#8 a (overcurrentdevices)may encloseconductorsor busbarsbut shall not be usedto encloseswitches,overcurrentdevices, appliances, or othersimilarequipment. Text Reference Section 374-l
#g d,(Atl of the above)An insulatedconductorusedwithin a switchboardshall be listed, flame retardant,ffid shall be ratednot lessthanthe voltageappliedto it andnot lessthanthe voltage apptiedto otherconductorsor busbarswith which it may comein contact.Text ReferenceSection3 84-9 #L0 a(directlyto the premisewiring systemusingan acceptable methodfrom Chapter9.) Wtrerea flexible cord is usedto supply a room air conditioner,the lengthof suchcord shallnot exceed10 ft (3.05 m) for a nominal,120-voltratingor 6 ft (1.83m) for a nominal, 208-or 240-voltrating.Text ReferenceSection 440'64 #l l c (Metal-Clad)Permittedwhereeither(l) all of the electric light, power,or (2) all of the Class2 circuit conductorsarein or metal-clad,nonmetallic-sheathed, raieway or in metal-sheathed, Type IJF cables.Text ReferenceSectionT25-5a(a)(3) #l2b (30 inches)The width of the working spacein front of the electric equipmentshallbe the width of the equipmentor 30 in. (762 mm), whicheveris greater. Text ReferenceSection1l0-26(a)(2) # 13 c (6 feet)In general,lengthsin excessof 6 ft shallbe part of a manufacturedassemblyor wiring system.Text ReferenceSection 350-10(a),620-21,and 430-145(b) #1.4b (5) Fasteningof unbrokenlengthsshallbe pennittedto be increasedto a distanceof 5 ft where structr,ualmembersdo not readily permit fasteningwithin 3 ft. Text ReferenceSection348-13 ExceptionNo. 1 # I 5 a ( 6 feet 7 inches)They shallbe installedso that the centerof the grip of the operatinghandleof the switchor circuit breaker, when in its highestposition,will not be morethan6 ft 7 in. above the floor or workingplatfonn.Text ReferenceSection380-8(a)
#16b (thesummationof the currentsof the motorsandotherloads to be operatedat the sametime that resultsin the highesttotal curreni.)Text ReferenceSection 430'24ExceptionNo.3
f . i
#I7 a(stripeson otherthangreeninsulationalongits entirelength or at the time of installationby a distinctivewhite markingat its -6(b) terminations. ) Text ReferenceSection200 Section4I0-56(e)and(i) #18 e (All of the above)Text Reference #19 c (l foot) Tap conductorsof a type suitablefor the temperaflrre encounteredshali be permittedto run from the fixture terminal connectionto an outl;t box placedat leastI ft from the fixture. Section410-67(c) Text Reference #20 c (bothA andB) The racewaysshallbe securedby an to the authority approvedmeans.Approvedmeansacceptable travingjurisdictionper Definition in fut 100.Text Reference SectionArticle 100defuritionof approved,andsections350-18 and3 51-8.
t .
t-
Electrician PracticeTest No. 17 motors,each not uceeding I hp in rating, shall bepermitted on a rI ' Several nominal 120-vottbranch circuit protectedat not over 20 amPeresor a branch circuit of 600 volts,nominal, or less,protectedat not over 15 amperes,if which of thefollowing conditionsare meL (-
a)
c b )
L,
c c ) ' d ) -')
c c i-
a)
run in Parallel
b)
nrn in at leastoneraceway
c)
run in an isolatedraceway
d)
run outsidethe racewaysbut securedto the raceway.
Tapsto brake coilsof $anes and hoistsshall beprotectedby-. r r
l-t
All of the above
lYlrereconductorsare run in parallel in parallel racewaysthe grounding conductorsshatt be r
3.
The full-load rating of eachmotor doesnot exceed6 amperes The rating of the branch-circuitshort-circuitand ground-faultprotectivedevicemarkedon any of the controllersis not exceeded. Individual overloadprotectionconforststo Section 430-32.
r
a)
20 amperescircuit breaker
b)
15 amperefuses
c)
10amperefuses
r*
4,
Nothing.No protectionis required d) The ampererating of the disconnectingmeansseming a hermeticrefrigerant of the nameplaterated'load cuftent or motor-compressorshallbebranch-circuitselectioncurcent,wlticheveris greater c
l.'
r.
a)
115Percent
b)
125percent
c)
135percent
I2.
Rgferto theJigurebelow-The current through R2 is -. closestanswer) f
a) 2.7 amPeres
r
b) 1.3arnPeres
a
c) 5.7 amPeres
r
a1 8.1 amPeres
l9O ,/clts
1
I
V
Lt *?
(selectthe
Rl
30 ohms
s to otrm A A A A
Performancestandard(s)that transfer equipmentusedin emergency shatl meet is: systems r r
and . Automaticbansferswitchesshall be electricallyoperated a) mechanicallyheld. Transferequipmentshall be designedand installedto preventthe inadverteniinterconnectionof normal and emergencysourcesof nt -'*pply in any operationof the hansferequipment.
c
loads. cy Transferequipmentshall supplyonly emergency
{-
d) AX of the above
t 1t In a run of underground rigid metal conduitfrom a gasoline dispercer to 'r-at the semicZpanelbiard in o nonhaurdow location a total of -sealoffs are required (t
( f
r.\
I
a
)
1
b
)
2
c
)
3
d
)
4
7 5. In general, direct burial cabli rated above (-
12,000
c b )
5,000
(-
c)
2,400
d)
2,ooo
(-
L| 6 v'
a)
volE shall be shielded
In a hospital general care area each patient bed location shall be ptovided with a minimum of -recePtacles,
r-
a)
1 duplex
i b )
3 duplexor 6 single
(-
2 duplexor 4 single.
c)
r d )
4 duplex is to be installedon this in, from the sudace of
Wtere o sudace-mountedfrxturecontaining a ballast 77. combustibli tow4ensity cellulosefiberboard,it shall be lbtedfor condition or shallbespacednot lessthan theJiberboard C f
r a
a)
v4
b)
3t8
c)
I ll2
d)
2
Ig.
Ig.
Yhat is the minimum sizeequipment bondingiumPer requhedfor a racaeoy containing a circuit protected at 60 amperes.
r a )
No. 14
r b )
No. 12
r c )
No. 10
r d )
No.8
An individual outlet with taps not over 18 inches long is connectedto a 50 ampere urcuil to supply a household hitchen wall-mounted oven The tap amperes. conductor ampacity shall not be lcssthon ' a )
50
r-
b)
40
c)
30
r-
(-
)n 3t"
20 d) Given an AC transformer and DC rectiJier arc welder with a 60percent ddy cycle,The ampacityoJthe supply conductorsshall be calculatedby mutliplying the nameplatecutent by afactor of ' a )
.78
(-
b)
.84
c)
.89
r*
( . l
' I
Electrician PracticeTest No. 17 :
ANSWBRES
,,
#1 d (all of the above)TextReferenceSection430-53(a)
.,
#2 a(run in parallel)Whereconductorsarerun in parallelin multiple racowaysor cablesaspermittedin Section3 l0-4, the equipmentgounding conductors,whereused,shall be run in parallelin eachracewayor cable.Text ReferenceSection250122(f)
1..\
e' ' : t .
r I
t
\
r
#3 d Qrlothing.No protectionis required.)Tapsto brakecoils do not requireseparateovercurrentprotection.Text ReferenceSection 610-42(b) shallbe at #4 a (115percent)The ampereratingof the disconnect least 1l5 percentof the nameplaterated-loadcurrentor branchcrcuit selectioncurrent,whicheveris greater.Text Reference Section440-12(a)
t.
Section515-5(a) #5 d (all of theabove). TextReference t..
, L,; t .
L;
L t .
1..
L.
in not lessthan2 in. of #6 c (nonmetallicracewaysencased concrete,TypeMI, MC, or AC cablecontainingan insulated equipmentgroundingconductor) in not lessthan2 in. of #7 c (3) nonmetallicracewaysencased concrete,TypeMI, MC, or AC cablecontainingan insulated Section517-19(b) equipmentgroundingconductorText Reference Section700-12(b) #8 d (15 minutes)TextReference
location)Any inhalationanesthetung #9 c (non-hazardous locationdesignatedfor the exclusiveuseof nonflammable agentsshallbe consideredto be an other-thananesthetizsng (classified)location.Text ReferenceSection5l7'60(a) hazardous The conductors,including splicesandtaps, # 10 c (75, accessible) shall not fill the wireway to more than 75 percentof its areaat that point. Text ReferenceSection 362'7 for metallic wirewaysand Section362-21for non metallic wireways. # 1I b (wireway but there is deratingfor over 3 currentcarrying conductorsin a nonmetallicwireway.)Text ReferenceSections 362-5 and362-19 4 x 10 and4 x l0 is 80 voltsleaving120-80or #l2b (1.3amperes) 40 volts acrossR2. 40130- 1.3aqtperes
I ?0 'rq,]tE
r
l:lt
H1
30 ohrns
#13 d (all of the above)Text ReferenceSection700-6 going #I4 b (2) Onesealoffwhenthe conduitleavesthe dispenser from Class1, div 2 to Class1, div 1 (undergloundfor 20 feet from the d,ispenser), and anothersealoffwherethe conduitemergesfrom undergroundsinceit passedthrougha Cl 1, div 1 location.Text 501-5(a)(a) ReferenceSectionTable 514-2,Section5L4-7,514-8, and(b)(2) Section310-7 # 15 d (2000)TextReferencp
i
( t '
ffi6 c (2 duplexor 4 single)Eachpatientbedlocationshallbe They shallbe providedwith a minimum of four receptacles. permittedto be of the singleor duplextypesor a combinationof both.TextReferenceSection517-18(b)
t
r. r. . "' ' n , .
fixture contaildngaballastis #17 c (I %)Wherea surface-mounted to be installedon combustiblelow-densitycellulosefiberboard,it shallbe listedfor this conditionor shallbe spacednot lessthan 1% in. (38 mm) from the surfaceof the fiberboard.Text Reference Section410-76(b) #18 c (I.io.l0) By Table250-122aNo. l0 copperis requiredfor a Section250-102(b) 60 a:npereovercrurentdevice.Text Reference and Table250-122 ft19d (20)Tap conductorssupptyingelectricranges,wall-mounted electriccookingunits from a electricovens,and counter-mounted 50-amperebranchcircuit shallhavean ampacityof not lessthan 20 and shallbe sufficientfor the loadto be senied.. Text ReferenceSection210-19(c)ExceptionNo. I
t
t ' t' ,
shallnot be less #20 a(.78)the ampacityof the supplyconductors than the currentvalue determinedby multiplying the ratedprimary currentin amperesgiven on the welderratingplateandthe following factorbasedon the duty cycle of the welder.Text *eferenceSection330-11(a)andTable
Electrician PracticeTest No. 18 "7
-')
Buswaysshall be supportedat intervals not to uceed -feet designedand marked othemtisa
c a )
3 feet
r b )
5 feet
c c )
4 l12 feet
Givena 4 11/16 ' by I 1/2 inch deepbox Eow many No. I conductorscan he splicedin this box
r a )
A .?
r b )
6
C
9
c) c d )
? e'
1,2
Toprovide short circuit and ground-fault protectionfor a branch circuit supptying o motor, afeeder conductorsupplyingthat branch circuit shall be provided with a r a )
magnetictrip unit
r b )
thermalrelay
(-
protectivedevice
c,
r d )
4.
unless
motor circuit switch
A 120 volt 30 an pere branch circuit shall have o power load not to exceed kilovolt-amperes. a)
3.6
b)
7.2
c)
2.88
5.
The minimum distance between SIat(phaseto phose) switchgear that has (Assumephase to ground voltageas 5 kv / accessto liveparts ts-. 1.732) r e '
a)
3 feet
b)
4 l/2 feet
c)
6 feet
c
6.
7 feet d) Yithout aceptions the minimum heodroom of working spacesabout serryiceequipment, tnotor control cenlets, switchboards, and panelboails is
i-
a)
5 feet
c b )
6 feet
c c )
6 ll2 feet
(t d)
7.
7 feet
What size raceway is requiredfor installing thefollowing XIIHW coPpef conductorsin a conduit over 24 inches long. (a) two 400 kcmil (b) six 500 kcmil (b) one bare 3/0 c c r
a)
6 inch
b)
5 inch
c)
4 inch
(-
8.
3 U2 :l:,ch d) Fixed wiring used to supply etlernal power to aircraft within an aircrart inchesabovethetloor level. hangar shall be installed at least C
r r
a)
24
b)
18
c)
12
d ) 6
t .
"O
In an apartment building the disconnecting meansin addition to the unit , (selectthe best switchforfixed appliances shall be locoted answer) r r' (^ r
70.
a)
within sight of the aPPliance
b)
wrthin the dwelling unit, or on the samefloor asthe dwelling unit in which the applianceis installed
c)
iaside an individual dwelling unit
d)
in the electricalroom on the first floor
Wiring methodsinsideplenums usedfor environmentalair include: f r r'
^) b) c)
Flexible metal conduit and liquidtight flexibl.emetalconduit shall be permitted,in lengthsnot to exceed4 ft Type MI cable,Tlpe MC cableemployinga smoothor comrgated imperviousmetal sheathwithout an overallnonmetalliccovering electricalmetallic tubing, flexible metallictubing,intermediate metal conduiL or rigid rnetalconduit
r
All of the above d) 120/240vott servicethe current in LI is 15 amperesand the ''t ''I ' In a 3 wire current in L2 is 25 amperes.The current in the groundedconductorshould amperes. be_ r. c
a)
10amPeres
b)
15 amPeres
c)
25 amPeres
r-
o amPeres d) general the minintum work spacerequired infront of a panelboardis 1I -) ' In high. inches wide,and-feet in front, -feet
' (' e
a)
3 , 3 0 , 6l l 2
b)
3 r12,36,6
c)
2 , 3 0 , 6l l 2
t ? '-J'
In general the minimum work qpacerequired infront of sertticeequipment inches containing overcurrent deyicesir_ feet infroflt, high. wide, and -feet
3,30,6l/2
LI lao
r b )
3 l/2,36,6
(-
2 , 3 0 , 67 / 2
c)
Except as elsewhererequired or permitted by the Code,live para of electric or more shall bCguatded agairct equipmentoperating at _volb icitlental contact by approyed enclosures9f by 1, By loc@tr ln a roomr vault, or similar englostae that is accessiblconly to qualifuil pentons. 2. By suitable permaneng substaitial partilbns or screensananged so thd only qualifutl personswill hary accessto the qpace within reach of the live pafts. |nybpritogs in sach partitions or screensshall b:esized and located so that personsare not tikely to corneinto accidentalcontact with the live pat6 or to bring conducting object into contact witlt then 3. By location on a suitable balcony, gallery, or platform elevatedond arranged so as to exclude unqualifted penons. or 1. By elevation of 8,ft (2.44 m) or more abovethefloor or other working surface. c r (-
a)
24 volts
b)
3ovolts
c)
4g volts
(-
50 volts O general the ampererating of a disconnectingtnearutserving a hermetic zt r'55 In relrigerant motor-compressorwhich hasa nameplaterating of 50 amperes amperes,(Selectthe closestanswer) shall be at least ({i-
a)
50 rmperes
b)
58 amperes
c)
62.5amperes
box containsa switch,6 No.12 conductorsthat are spliced,and a No. 12 It /a ' A equipmentgrounding conductor,If there arc no clampsin the box what sizebox is required? {-
a)
4 x2Il8 x2Il8 device
r b )
3 x2x3% device
c c )
4by ll2 inch square
minimum servicedisconnectsizefor a singlefamily dwelling is I B. The amPefes.
: t :
. a )
60
' b )
100
t
r25
.
c)
serviceinstalled by the
Thegrounding conductorfor a communications 79. telephone company cannot be smaller than
^)
N o . 12
' b )
No. 14
{-
c)
No.6
d)
No. 8
(z) n ltt
Mten a separate grounding electrode is installedfor a communications semice U inaU be-bondedto the power grounding electrode system wilh a a copper or equivalent bondingiumper. minimum size No.
r a'
a)
No. 14
b)
No.8
c)
No.6
d)
No. 4
Electrician PracticeTest No. L8 ANSWERES at intervalsnot #1 b (5 feet)Buswaysshallbe securelysupported exceeding5 ft (1.52m) unlessotherwisedesignedandmarked. Text ReferenceSection 364-5 sectionTable #2 c (9) Table 370-16(a)shows9 Text Reference 370-16(a) #3 c (protectivedevice)A feedersupplyinga specificfixed motor load(s)andconsistingof conductorsizesbasedon Section 430-24 shall be providedwith a protectivedevice.Text ReferenceSection a30-62(a) #4 a(3.6) ln no caseshallthe loadexceedthe branch-circuit ampererating.An individualbranchcircuit shallbe permittedto supplyany loadfor which it is rated. 120voltsx 30 amperes: Section210-23 :,OOOva;3,600/ 1,000- 3.6KVA TextReference Condition3; voltageto gloundis #5 c (6 feet)ByTable110-3a(a) SectionTable110-3a(a) 5,000I 1.732-- 2887voltsTextReference #6 c (6 % feet ) The minimumheadroomof working spacesabout or motor control panelboards, serviceequipment,switchboards, Section110-26(e) centersshalibe 6% ft. TextReference #7 b (5 inch)Fromchapt.g Table5; 400kcmil atea:2x(.5782 sq.in.); 500kcmil area: 6 x (.6984sq.in.);FromTable8 3/0 bare *ia -- .173sq.in.;Totalarca:5.5198sq.in.;By Table4a5 inch Rigid 40%with area- 8.085sq.in. is required.Text Reference SectionChaptt.9 Tablesl, 4,5, and8
shallbe desiguedandmountedso that #8 b (18)Aircraft energizers all elestricequipmentand fixed wiring will be at least18 in. (457 mm) abovenoot level and shallnot be operatedin a ClassI locationasdefinedin Section513-3(c).Text ReferenceSection 5 13-11(a0 #9 b (within the dweiling unit, or on the samefloor asthe dwelling unit in which the applianceis installed)In multifamily dwellings, the other disconnectingmeansshall be within the dwelling unit, or on the samefloor asthe dwelling unit in which the applianceis installed, ffid shall be permittedto control lamps and other appliances #10 d (All of the above)Text ReferenceSection300-22@) The groundedconductorcarriesthe unbalanced #11 a (10 amperes) load that is 25 - 15 amperes:10 amperes.Text ReferenceSection Basic Theory and Section110-26(a)(1)(2X3) #12 a(3, 30, 6Yr)TextReference I 10 -26(e) Section110-26(a) #13 a(3, 30, 6 Yz)Text Reference #14 d (50 volts)Text ReferenceSection110-27(a) # 15 b (115percentof 50 amperesis 57.5)Text ReferenceSection
440-r2(a) #16 b (70)By TableB-310-11with a loaddiversityof 50 percent the deratingfactoris 70 percent.Text ReferenceSection310-15(a) and (c), AppendixB TableB 310-11
wirecountis 6No. 12's,2No' 12's #17c(4 by Yztnchsquare)The : for the-switch,andoneNo.12 for the ground 9 total. 9 x2.25 cu. in. - 20.25cu. in. A 4 by ll2nchsquare hasa cubicinch capacity Section of 21.0. all the otherboxesaretoo small.Text Reference 370-16Table370-r6(b)
t
#18 b (100)For a one-familydwelling,the servicedisconnecting 3-wire. meansshallhavea rating of not lessthan 100amperes, Text ReferenceSection 230-79(c) #19 b ( No.a) For a one-familydwelling,the seryicedisconnecting 3-wire. meansshallhavea ratingof not lessthan100amperes' #20 d(l.Io. 4) A bondingjumpernot smallerthanNo. 6 copperor equivaientshallbe connectedbetweenthe communications groundingelectrodeandpowergroundingelectrodesystemat the areused' electrodes building or stnrctureservid whereseparate Text ReferenceSection800-40(d)
&
L-
Electrician PracticeTest No. 19 r't
A motor controller that is subjectto periodic submersingin liquid sewage enclosure probably requiresa NEfuIA TyPe'^ c r c r
t.;
a)
NEMA 4
b)
NEIUA 6
c)
NEMA 12
d)
NEMA 7
e)
Both b and d
NEMA ratings. TherearemanyNEMA ratingsavailablefor enclosures.Below,is an brief explanation of eachNEMA rating. NEMA I Type 1 enclosuresare intendedfor.indooruseprimarily to provide a degreeof protectionagainstcontactwith the enclosed Lquipmentoi locationswhereunusualserviceconditionsdo not exist' NEMA 2Type2 enclosuesareintendedfor indooruseprimarilyto providea degreeof protectionagainstlimited asrountsof falling water and dirt. NEMA 3 Type 3 enclosuresare intendedfor outdooruseprimarily to providea degreeof protectionagainstwindblown dust,rain' and by the fonnationof ice on the enclosure. ileet; and to be undamaged areintendedfor outdooruseprimarilyto providea degree NEMA 3R Type3R enclosures of protectionagainstfalling rain; andto be undau-raged by the formationof ice on the enclosure. NEMA 4 Type 4 enclosuresare intendedfor indoor or outdooruseprimarily to provide a degreeof protectionagainstwindblown dust andrain, splashing*ul.r, andhosedirectedwater; andto be undamagedby the formation of ice on the enclosure. NEMA 4X Type 4X enclosgresareintendedfor indoorandoutdooruseprimarily to provide a degreeof protectionagainstcorrosion, water;andto be undamaged water,andhose-directed windblown dustandrain, splash-ing by the formationof ice on the enclosure.
NEMA 6 Type 6 enclosuresare intendedfor indoor or outdooruseprimarily to provide a degreeof protectionagainstthe entry of water during temporarysubmersionat a limited depth;and to be undamagedby the formation of ice on the enclosure. NEh,fA 7 Type 7 enclosuresare for indoor usein locationsclassifiedas ClassI, Groups A, B, C, or D, asdefinedin the National Electrical Code. Tlpe 7 enclosuresshall be capableof withstanding the pressuresresulting from an internal explosionof specifiedgases,and contain suchan explosionsufficiently that an explosivegas-airmixture existingin the atmospheresurrotmdingthe enclosurewill not be ignited. Enclosedheatgeneratingdevicesshall not causeextemal surfacesto reachtemperaturescapableof igniting atuosphere. Enclosuresshall meet explosive gas-airmixturesin the sr.urounding explosion,hydro-static,and temperature designtests. NEMA 9 Type 9 enclosuresareintendedfor indoor usein locationsclassifiedas ClassII, Groups E, F, or G, as definedin the National ElectricalCode. Type 9 enclosuresshall be capableof preventingthe entranceof dust. Enclosedheat generatingdevicesshall not cause extemal surfacesto reachtemperaturescapableof igniting or discoloringdust on the enclosureor igniting dust-airmixhrresin the surroundingatuosphere. Enclosuresshall meetdust penehationand temperature design tests,and aglngof gaskets(if used). NEMA 12 Type 12 enclosuresare intendedfor indoor useprimarily to provide a degreeof protection againstdust,falling dirt, and dripping noncorrosive liquids. NEMA 13 Type 13 enclosures areintendedfor indooruseprimarily to providea degreeof protection againstdust,sprayingof water,oil, and noncorrosivecoolant.
i
of ) A ground ring grounding electrodeshalt encircle the building and consist zo shall and No' at-least20feA oYborc cipper conduc"tornot smaller than be buried to a dePthof no lessthan
^)
4, 3 feet
' b )
2,2 feet
(-
c)
2,2 t12feet
' d )
2, 18inches
t
-"?
/"
.
fn general, Type tlFfeeder and branch circuit cableshall be buried to a of buildings ' minimum depth of -ott&ide
r a )
24 inches
r b )
18inches
r c )
12 inches
r d )
6 inches
If direct buried cablesare installed under buildings theyshall be installed in which manner.
r-
a)
shallbe installedin a racewaY
r c )
shall be in a trenchwith 2 inchesof concreteover the trench. direct buriedjust like they areoutsidethe building'
r d )
aandb
r-
aandc
c b )
e)
percent,of its cross S A conduitnipple shallbepermitted to beJitled to 60 Jo htclres. sectionalorii y Ut tength u /essthan or equal to ,-a)
18
c b )
24
c)
30
d)
36
(..
6.
Underwater lightkgtirtures in swimming pools shall beprotected with groundfoult circuit intenupten if theJirtures operate d more than volts.
r a )
30
r b )
48
c)
15
d)
120
(_
^7
8.
Dbregarding any uceptions,lightingftxtures and Whttng outlets installed over an outdoor spa without groundfaultprotection shall be bcated not less abwe the noximum water level LightingJirtures installcd over than _ spa, where GFCI is instalkd, requhe a clearonce of not lessthan an indoor abovethe maximum water level c a )
10 feet and 5 feet
c b )
12ft,and7 ft.6 inches
{.
12 feetand 12 feet
c)
Conductors that are direaly buried in earth shall be
r a )
identified for suchuse
.^b)
labeledfor suchuse
(-
listedfor suchuse
c) ' d )
installedin raceway.
be usedas an equipmentgrounding "O Aluntinum cable traysshall not amperes. conductorfor circuitswith a groundfault protection above-
r 1
C
a)
2,000
b)
600
c)
400
d)
100
zt n v'
The ampacityof No.2 Type ttVtt 90 degreeC. ratedflexible cord in a 30 degreeC. ambient when there are 3 current carrying conducton in the amperes. cablels,-a)
t52
r b )
r25
c c )
100
r^
90
d)
sourcesother than transformersusedto protect ClassI Power 1 7 .Power Limited Circuitsshall beprotectedby overcurrenldevicesrated at not more of the rated current of the source (volt-tmperes than -pgryent divided by voltage rating) { t-
a)
100
b)
t25
c) ' d ) Lt - ? '
167 200
A dbconnect is requiredto be installed within
of the inside walls of a
hottub,
^)
5 feet
' b )
15 feet
{
25 feet
. c)
? A 120/240volt servicecable passingoveran out door hot tub shall havea '-I >" abovethe water leveL vertical clearanceof at least-feet
r (*
a)
T2
b)
15
c)
22
d)
18
dual rated Type USE conductors cannot be installed inside a building 'I /a' Non and shall beprotected where they emergesfrom under ground by -, f c r
t S 1r'
a)
a racewaythat extendsup to 8 feet abovegror:nd
b)
other effective means
c)
a coating of fue retardantmaterial
Four current carrying )flHW insulated 500 kcmil aluntinum conductors are installed in a racewaythat is in a WET locotbn The ampacily rating of eachconductor is -amPercs. c c r-
a)
310
b)
280
c)
248
.- d) t6 1v'
2oo
Given: One 25-hpr 460-Vr3-phose,squinel-cage motor, nameplatefullbad curyent 32 A, DesignB, SemiceFactor 1.15 The branch circuit amPeresand the conductorsshall have an ampacityrating of maximum time delayfuse sizethat can be usedto protect this circuit is _amPeres. r. c
a)
42'5 atd70
b)
4 0 and110
f
42'5 al.d60 c) grade and 23feetfrom the edgeof an 1t 7 ' ' A point located30 inchesabove indoor remotegasolinepump is classiJiedas-.
r a )
Class2,Division2
c b )
Unclassified
' c )
Class1,Division 1
c d )
Classl, Division 2
L..,
p power supplycords attachedto the side of recreationalvehiclesno morc !t l)t than 3feet abovethe ground shall be a minimum of -' r r
a)
28feet
b)
23 feet
r
15feet c) general-useswitchhaving an ampererating ngt lels than twice thefull' !t "O load current rating of the motor sholl bepermitted to sente as a horsepower disconnectingmeinsfor a stationory motor rated ot and 300 voltsor less. r ..
a)
2
b)
1'13
r-
a)nv'
1/g c) The rating of the receptacleand attachmentplug cap usedas a mobile homesupplyshall not be lessthan r ((* r
a)
50 amPeres
b)
10,000volt-amperes
c)
100amperes
d)
6 a'rnPeres
Electrician PracticeTest No. 19 ANSWBRES .
r
areintendedfor #1 e (bothb andd)NEN4A 6 Type 6 enclosures indoor or outdooruseprimarily to providea degreeof protection arefor againstthe entryof water. NEIvIA 7 Type 7 enclosures indoorusein locationsclassifiedasClassI, GroupsA, B, C, or D. Tert ReferenceSection
t. i
There aremanyNEMA ratingsavailablefor enclosures.Below, is aa brief explanation of eachNEMA rating.
, 1,
NEMA 1 l
areintendedfor indooruseprimarilyto providea degreeof protection Type 1 enclosures againstcontactwith the enclosed e[uipment or locationswhereunusualserviceconditionsdo not exist.
r
*MA2
. I'
Type 2 enclosuresare intendedfor indoor useprimarily to providea degreeof protection againstlimited amountsof falling water and dirt. NEMA 3
I , t: . r...
areintendedfor outdooruseprimarilyto providea degreeof Type 3 enclosures protectionagainstwindblown dus! rain, and r6.t; and to be undamagedby the fonnation of ice on the enclosure. MMA
3R
areintendedfor outdooruseprimarilyto providea degreeof Type 3R enclosures protectionagainstfalling rain; andto be undamagedby the formationof ice on the enclosure' NEMA 4 areintendedfor indooror outdooruseprimarilyto providea degreeof Type 4 enclosrues protectionagainstwindblowndust 'and by the formation rain, ,pi*niog water,andhosedirectedwater; andto be undamaged of ice on the enclosure.
NEMA 4X Type 4X enclosuresare intendedfor indoor and outdooruseprimarily to providea degree of protectionagainstcorrosion, windblown dust and rain, splashingwater,and hose-directedwater; and to be r:ndarnaged by the formationof ice on the enclosure. NEIUA 6 rue intendedfor indoor or outdooruseprimarily to provide a degreeof Type 6 enclosrrres protectionagninstthe entry of water auring temporarysubmersionat a limited depth;and to be undamagedby the formation of ice on the enclosure. NEN,fA 7 Type 7 enclosruesare for indoor usein locationsclassiliedas ClassI, GroupsA, B, C, or D, as definedin the National Electrical Code. Type 7 enclostuesshall be capableof withstandingtbe pressuresrezultingfrom an intemal explosionof specifiedgases,and contain suChan explosionsufficiently that an explosivegas-airmixture existingin the atmospheresurroundingthe enclosurewill not be ignited. Enclosedheatgeneratingdevicesshall not causeexternalsurfacesto reachtemperaturescapableof igniting explosive gas-airmixturesin the surroundingatnosphere, Enclosuresshallmeet explosion,hydro-static,andtemperature designtests. NEMA 9 Type 9 enclosuresare intendedfor indoor use in locationsclassifiedas ClassII, Groups E, F, or G, as definedin the National ElectricalCode. Type 9 enclosuresshall be capableof preventingthe entranceof dust. Enclosedheat generatingdevicesshall not cause extemal surfacesto reachtemperafixescapableof igniting or discoloringduston the encloswe or igniting dust-airmixturesin the surroundingatnosphere. Enclosuresshall meetdustpenetation and temperature design tests,and agmgof gaskets(if used).
NEIVIA 12 Type 12 enclosuresare intendedfor indoor useprimarily to provide a degreeof protectionagainstdust,falling dirt, and liquids. drippingnoncorrosive L
NE}IA 13 Type 13 enclosuresare intendedfor indoor useprimarily to providea degreeof protectionagainstdust,sprayingof water,oil, andnoncorrosivecoolant. L.
#2 c (2,2 tl2 feet)A groundrine encirclingthe building or structuro,h direct contactwith the earthat a depthbelow the earth'ssurfaceof not lessthan2y, ft (762mm), consistingof at least20 ft (6.1m) of barecopperconductornot smallerthanNo. 2. Section250-50(d) Text Reference #3 a (24 inches)The generalrequirementwithout otherconditions Section339-3(aX3), is 24 inchesper Table300-5Text Reference Table300-5 #4 a (both a andb ) Undergroundcableinstalledundera building shall be in a racewaythat is extendedbeyondthe outsidewalls of the building Whereinstalledundernot lessthan2 n. (50.8mm) of concretebeneatha building or otherstrrctureis consideredoutside a building.Text ReferenceSection300-5(c ) andsection230-3(I) #5 b (24) Whereconduitor tubingnippleshavinga maximum lengthnot to exceed24 n. (610mm) areinstalledbetweenboxes, the nipplesshallbe permittedto cabinets,andsimilarenclosures, area.Text be f,rlledto 60 percentof theirtotalcross-sectional ReferenceSectionchapter9 TableI Note 4
#6 c (15) a ground-faultcircuit intemrptershallbe installedin the branch circuit supplyingfixtures operatingat more than 15 volts, so that there is no shockhazatdduring relamping.Text Reference Section680-20(aX1) #7 b (12 ft., andTft 6 inches)12 feetfor outsideandTft. 6 inches for insidewith GFCI. Text ReferenceSection680-40,680-6(b)' 680-41(b) #8 a (identifiedfor suchuse)Conductorsusedfor directburial applicationsshallbe of a type identified for suchuse.Text ReferenseSection3 l0-7 #9 a(2000) Aluminum cablefrays shallnot be usedasequipment gounding conductorsfor circuits with glouqd-faultprotection aborre2000 amperes.(600 amperesfor steel)Text Reference SectionTable318-7(b)(2)Noteb #10 a (152)ByTable400-5(8)This cablehasan ampacityof 152 Text ReferenceSectionTable400-5(8) last column Elmperes. # 11 c (167)Powersourcesotherthantransformersshallbe protectedby overculrentdevicesratedat not morethan 167 percentof the volt-ampererating of the sourcedividedby the rated voltage.Text ReferenceSection 725-21(a)(2) #12 a(feet)locatedat least5 ft (1.52m) fromthe insidewallsof the pool, spa,or hot tub.A disconnectingmeansshallbe provided and be accissible,locatedwithin sightfrom all pools' spas,andhot tub equipment.Text ReferenceSection680-12 Section #13 c (zz)FromTable680-8Column1. TextReference 680-40andTable680-8
1
#14 a(a raceway thatextendsup to 8 feetabovegound) Directburiedconductorsandcablesemergingfrom the groundshallbe protectedby enclosuresor racewaysextendingfrom the minimum coverdistancerequiredby Section300-5(a)belowgladeto a point at leastB ft (2.44m) abovefinishedgrade.Text ReferenceSection 300-5(d)and338-4(b) columnfor use the 75 degree #15 c (248).8x 310: 248 anryeres. aluminumbecauseof the wet locationper Table3 10-13 for )GIHW. Text ReferenceSectionTable310-13)GIHW and footrotes.Table3 10-16 andTable3 10-15(bX2Xa) 225percentx 34 #16 a (42.5and70) 1.25x 34 :42.5 amperesad.rld Text Reference -76.5. the next smallersizefuseis 70 amperes. Section430-6(a),430-22,430-23(a),430-52,and430-152 SectionTable514-2 #I7 d(Class1,Division2)TextReference # 18 b (23 feet)The cord exposedusablelength,measuredto the point of entryon the vehicleexterior,shallbe a minimum of 23 ft il .o rn) wheiethe point of entranceis at the sideof the vehicle. Section551-46(b) Text Reference switchhavingan ampereratingnot less #19 a(2) A general-use than twice the FLA of the motor is permittedfor up to 2hp. Text Section430-I 09(c)(1) Reference thepowersupplyto the mobilehomeshallbe a #20 a(50 amperes) feederassemblyconsistingof not morethanonelisted50-ampere cord.TextReferelceSection550-5(a) mobilehomepower-supply
Electrician PracticeTest No. 20 rtt
Wtat is rhe duty cyctefor a spot weldersuppliedby a 60-Hzsystem(216'000 cyclesper hour) making three hundred 1S-cycleweldsper hour? {' ''
-')
a)
lPercent
b)
2'1 Percent
c)
3'2 Percent
Mtere conductorsare installedin racewoyssizesNo.bestranded r-
10
a) c b )
8
(-c)
6
'
4
d)
and larger shall
? With afeeder load of 14 kW on a houseltoldelectricrange,the naximum Jo unbalinced load sniU be consideredto carry a load of : (chosethe closest answer) I l
. (
a)
41 amperes
b)
26 amPeres
c)
33 amPeres
,t Mtere THHN conductorsare addedto an existingracewaythat contains ao o&er 60 degreeC insulatedconductors,the ampacityof the THHN conduclorscannotexceed. re (-'
a)
The ampacitiesin the 60 degreecolumn
b)
in the 75 degreecolumn The arnpacities
c)
in the 90 degreecolumn The ampacities
d)
in the 90 degreecolumnwith 60 percentderating. The ampacities
r'S
The ampacity of a 75 degreeC. rated conductor in an antbient of 75 degrees c. is c
11 0 arnPeres
f
b) 90 percentof its normal arnpacity c; 60percentof its 75 degreeampacity
r 6.
Wirkg to receptaclesunder raisedfloors in computer rooms shall be r f'
cable a) Type MI cable,Type MC cable,or Type AC metal in rigid metal conduit,rigid nonmetallicconduit,intermed.iate metal conduit, electrical metallic tubing, metal wireway, strrface b) racewaywith metal cover, flexible metal conduit,liquidtigbt flexible metal or nonmetallicconduit
{-
c; Nonmetallic ShieldedCable(Nt!B)
r
d) All of the above
c
e) A andB of the above
7. Intrinsically safe circuits can be identitied using -. r
a) blue color
r
b) red color
{-
c) orangecolor
c
d) anycolor
8. Nonincenditive circuitsshall bepermitted to be usedin -areag c
a1ClassI, Division 2
c
b; ClassI, Division 1
c
c; ClassIII
r
d) All of the above
r
e) onlY a andc'
O /o
What is the maximum distanceallowedfor spacingsupportsfor No' 10 copper conductors which are vertically installed in raceways, r (r
a)
25 feet
b)
5o feet
c)
100feet
(-
150feet
O 10.
Flat conductorcableinstallations: r (' (' '
a)
Are suitablefor schoolinstallations
b)
Must be installedundercarpetsqwres
c)
Canoniy be installedon concretefloors
d)
Are limited to voltagesnot exceeding150volts'
, Bv the 1999Codea restaurantmay be wired usingnonmetuAicsheathed t7rc "LU, when: (I) The building is NOTrequired to beJire rated construction. (2) The buitiling doesnot uceed 3 floors and the restaurantoccuPancy Ioad is lessthan 100persons.(Selectthe bestanswer') {c r f
Lt -')
a)
1 only
b)
2 onlY
c)
Both I and2
u,
N e i th er tot2
Mineral insulatedcable b approvedfor almostall locationsand conditions bil one of the below.Whichis it?' r a r
a)
Whereembeddedin concrete
b)
Exposedto gasoline
c)
corrosiveconditions whereexposedto destnrctive
73.
TypeAC cableshall be constructedto include: a) At least3 conductors a
t .t lac
b) An insutatedequipmentgroundingconductor An internal bonding sfiip of copPsror aluminum in intimate contact c) with the armor for its entire length.
Thepuy box belowis usedfor conductorslarger than No, 6. What are the reqiired mhimum dimensionslor X and Y7
r a )
X:24 inches,Y = 16 inches
c b )
X=20 inches,Y = 24 inches
.^c)
X=24 inches,Y = 24 inches
r d )
X = 30 inches,Y:30 loches 3 inchconduits
2 inbhconduits
t S 1v'
How many 1/2 inch diametercontrol cablescan be installed in a 18 inch hdder typecabletray with 6 inch high sides?
r a )
100
c b )
r25
r-
150
c)
' d )
275
t-"
per phase in a A If a senice consistsof 4 each 500kcmit copperconductors It o' voltswhat sizecopperbondingiumper iroti "ii is 3 -phasi 4 wire 480/277 L required on tie supplyside of the semicedisconnectingmeans? '
r
a)
310
c)
300 kcmil
(-
350 kcmil d) a direct burial tr /7' Dbregarding exceptionsthe minimum coverrequirementfor cable'wiln icircuit voltageof 7200 voltsto ground is -. t ,
{t r r' '^
a)
30 inches
b)
36 inches
c)
42 inches
d)
48 inches
on a service? 78. Whenis groundfault protectionrequired
o Lt '"
'/ z T T l i l S o v o l t s s o l i d l y g r o u n d e d W y e r a t e d a t 1 0 0 0 a) or more amPeres or more i* I2Ol208volts Wye rated1200amperes b) c volts rated1000amperesor more 1201240 c) (* All of the above d) a light How many three way andfour way switchesare requiredto operate front eight (8) locatiotts? c . r (-
a)
6 each 3 waY, and2 each4 waY
b)
2 each 3 waY and 6 each 4 waY
c)
3 each 3 waY and 3 each 4 waY
d)
None of the above - it cannot be done'
20.
Whendoesthe Codeallow welding of Conduit'or couplings?
c r r
Whereracewayrisersor cable is not installedwithin the (lighting) shaltbe brazr,dor weldedto the pole a1nole, a threadedfitting or nipple oppositethe handholefor the supplyconnection' welding of conduit' b) The Codedoesnot allow always be welded c1 Conduit couplingscan
i
when the AHJ allows it' d1 Conduit can be welded
r
e) aandd
Electrician PracticeTest No. 20 AI\SWBRES #1 b (2.1%)The duty cycleis 2.1percent(300multipliedby 15, dividedby 216,000,multipliedby 100).Text ReferenceSection
l (bx3) 630-3 L,
t.,
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#2b (8) Whereinstalledin raceways,conductorsof sizeNo. 8 and largershallbe stranded.Text ReferenceSection310-3 : 14 KW convertsto 8,000+ (2 x.05 x 8,000) #3 b (26 amperes) : 36.7irmperes.70 percentx3-6.7astperes 8,800watts8,8001240 :25.7 amperes. Text ReferenceSection220-19andNote 1, SectionZ|O-ZZfor the groundedconductor70 percentapplication #4 a(The ampacitiesin the 60 degreecolumn)In no caseshall togetherin sucha way with respectto conductorsbe associated type of cirsuit,the wiring methodemployed,or the numberof conductorsthat the limiting temperatureof any conductoris exceeded. The conductoris alreadyat its maximum #5 a (0 amperes) operatingtlmperature.If the conductorcruriesany currentits Text Reference temperaturewill exceedits ratedtemperature. Section310-15(c)
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#6 e (bothA andB) Type ffiI cable,TypeMC cable,or TypeAC cable in rigid metalconduit,rigid nonmetallicconduit, intermediaiemetalconduit,andelectricalmetallictubing,metal wireway, surfacemetalracewaywith metalcover,flexible metal conduit,liquidtightflexible metalor nonmetallicconduitText ReferenceSection645-5(d)
#7 a(blue color)Color codingshall be permittedto identify intrinsically safeconductorswherethey are coloredlight blue and whereno otherconductorscoloredlight blue areused.Text ReferenceSection504-80(c) #8 e (only a andc) NonincendiveCircuit protectiontechniqueshall be permittedfor equipmentin thoseClassI, Division2; ClassI[, Division 2; andClassIII locationsfor which it is approved. #g c (100 feet) By Table 300-19(a)the marcimumheightwithout supportforNo. 18throughNo.Sis 100feet.TextReference Section300-19(a)andTable300-19(a) # 10 b (must be installedunder carpetsquares)Floor-mountedType FCC cable,cableconnectors,and insulatingendsshallbe covered with carpetsquaresnot largerthan 36 in. (9I4 mm) square.Those carpetsquaresthat are adheredto the floor shall be attachedwith adhesives.Text ReferenceSection328-10 release-type Section336-3and518-1 #11 c (bothI and2) TextReference #12 c (whereexposedto destructiveconosiveconditions)Text ReferenceSestion330-3and330-4 # 13 c (An intemal bonding ship of copperor aluminumin intimate contactwith the armorfor its entirelength.)Cablesof the AC type shall have an internalbonding strip of copperor aluminum in intimate contactwith the armor for its entire lengthText Reference Section333-19
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Y : 24inches)Y: 6x 3 + 3 + 3 : 24 inches; #I4 c(X : 24 tnches, : X is largerof(6 x 3) + 3 + 3 :Z4inches or (6 x2)+ 2 * I * I 16 inches.answerthe Box shallbe 24 inchesby 24 inches.Text Section 370-28(aX2) Reference
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#15 d (27s)Thesumof the cablecsa'sof all cablesshallnot exceed50 percentcablefraycsa.Trayarea:6x 18: 108sq' in'; : 50 percentof 108: 54 sq.in. Areaof onecable 3.t4 x .25x '25 -275 cablesTextReference - .ig6ZS;No of cables- 54 1.19625 Section318-9(b)
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#16b (250kcmil)4x 500- 2,000kcmil; thisis largerthan1100 kcmil so 12 Il2 percentof 2,000:250 kcmil TextReference Section250-102(c) t..
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or Wyeratedat 1000amperes voltssolidlygrounded #18a (2771450 shallbeprovidedfor protectionof equipment more)Ground-fault of morethan150voltsto seniices wyeelectrical solidiygrounded for eachservice 600voltsphase-to-phase ground,but not exceeding disconnectrated 1000amperesor more.
#19 b (2 each3 way and6 each4 way) The 3-waysgo at eachend and the four waysgo in between.More four ways couldbe added to conholthe light from morelocations. andsection410300-18(b) Section #20e (aandd) TextReference
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