Electrical Design Lectures

ELECTRICAL DESIGN LECTURES: THE SERVICE ENTRANCE CONDUCTORS Pow Power is suppl supplie ied d to a build building ing thro throug ugh h a servi service ce entra entrance nce.. Three Three heav heavy y wires, ires, toge togeth ther er call called ed the the drop drop,, exte extend nd from from a utilit utility y po pole le or an under undergr grou ound nd sourc source e to the the struct structure ure.. These These wire wires s are are twist twisted ed into into a cabl cable. e. At the the build buildin ing, g, over overhe head ad wire wires s are are faste fastene ned d to the the struct structure ure and and spli splice ced d to servi service ce entra entrance nce wire wires s that that ente enterr a cond condui uitt thro throug ugh h a servi service ce head head,, as shown shown in Figure 31-1 In plan plannin ning g over overhe head ad servi service ce drop drop pa path ths, s, minim minimum um heig height ht requ require ireme ment nts s for for conne connecto ctorr lines lines must be care careful fully ly follo followe wed. d. See See Figure Figure 31-2. 31-2. If thes these e dista distance nces s canno cannott be ma maint intai aine ned, d, rigid rigid cond conduit uit,, elec electri trica call me meta talli llic c tubin tubing, g, or busw busway ays s (chan (channe nels, ls, ducts) must be used. If the the serv servic ice e is supp suppli lied ed unde underg rgro roun und, d, thre three e wires ires are are place laced d in a rigi rigid d cond condui uit. t. An unde underg rgro roun und d serv servic ice e cond condui uitt is brou brough ghtt to the the me mete terr socke socket. t. An under undergr grou ound nd servi service ce entra entrance nce inclu include des s a wattatt-ho hour ur me mete ter, r, ma main in brea breake ker, r, and and light lightnin ning g prot protec ecti tion on.. Autom Automat atic ic brow browno nout ut equip equipme ment nt is also also requ requir ired ed by ma many ny code codes s for for new new const construc ructi tion on.. All All elec electri trica call syste systems ms must be grounded through the service entrance. SIZE AND RATINGS 2 Serv Servic ice e drop rop shal shalll have have suffi suffici cie ent ampaci pacity ty to carr carry y the the load load.. They They shal shalll not not be smal smalle lerr than than 8mm 8mm (3.2mm 2

diameter) copper or 14 mm  aluminum or copper clad aluminum Service entrance conductors shall be sufficient size to carry the computed loads. CLEARANCE CLEARANCE OVER THE ROOF (CONDUCTORS OF NOT MORE THAN 600 VOLTS): 1. 2500 mm (8 feet) - without elevation 2. 1000 mm (3 feet) - without elevation CLEARANCE CLEARANCE FROM GROUND (CONDUCTORS OF NOT OVER 600 VOLTS) 1. 3100 mm - above finished grade, sidewalks sidewalks or from any platforms or projection which may be reached. 2. 3700 mm - over residential driveways and commercial areas such as parking lots and drive-in establishments not subject to truck traffic. 3. 4600 mm - over commercial areas, parking lots or agricultural or other areas subject to truck traffic. 4. 5500 mm - over public streets, alleys roads and driveways on other than residential property. Note : (drawing is based on NEC standard) s tandard) UNGROUNDED CONDUCTORS SHALL NOT BE SMALLER THAN: 1.100A, 3- wire, for one family dwelling with six or more 2 branch circuit. 2.100A, 3-wire, for f or one family dwelling with an initial computed load of 10-kw or above. 3. 60A for other loads. EXCEPTIONS: 2 2 1. For loads consisting of not more than two wire branch circuit, 8 mm (3.2 mm dia.) copper or 14 mm aluminum or copper clad aluminum. 2 2 2. By special permission, for loads limited by demand or by the source of supply, 8mm  copper or 14mm aluminum or copper-clad c opper-clad aluminum. 2

2

3. For limited loads of a single branch circuit 3.5mm copper or 3.3mm aluminum or copper-clad c opper-clad aluminum. INSTALLATION INSTALLATION OF SERVICE CONDUCTORS: Service entrance conductors shall be installed in accordance acc ordance with the applicable requirements requirements of this code (PEC) covering the type of wiring method used and limited to the f ollowing methods: methods: 1. Open wiring on insulators 2. Rigid metal conduit (RMC) 3. Intermediate Metal Conduit (IMC) 4. Electrical Metallic Tubing (EMT) 5. Service-entrance cables 6. Wireways 7. Busways 8. Auxiliary Gutters 9. Rigid non-metallic conduit 10. Cable Bus 11. Type MC cable 12. Mineral-insulated Mi neral-insulated metal-sheathed metal-sheathed cable PROTECTION: Servi Service ce entra entrance nce cond conduct uctor ors s shall shall be insta install lled ed in acco accord rdan ance ce with with the appl applica icabl ble e requ requir irem emen ents ts an and d subje subjecte cted d to ph physi ysica call da dama mage ge shall shall be prot protec ecte ted d in any of the following ways or methods: methods: 1. By RMC 2. By IMC 3. By Rigid Nonmetallic Conduit suitable for the locations 4. By EMT 5. Type Ty pe MC Cable C able or other approved means means THE SERVICE EQUIPMENT-DISCONNECTING MEANS GENERAL: The Servi Service ce Equip Equipme ment nt-Di -Disco sconne nnecti cting ng Me Mean ans s shall shall be prov provid ided ed to disco disconne nnect ct all all cond conduct uctor ors s in a bu build ildin ing g or ot othe herr struct structure ure from from th the e servi service ce en entr tran ance ce conductors. IMPORTANT PARTS OF AN ELECTRICAL DES IGN 1. Service Drop

Service Drop

Service Entrance

Service Head / Cap

Conduit

Service Meter  Service equipment

OVERHEAD SERVICE Not to Scale

Private Pole Service Drop

Building Service Entrance Conduit

Service Meter  Service equipment

UNDERGROUND SERVICE Not to Scale Service Drop Clearance Over Roof (Without Elevation)

2500 mm BUILDING

Street HOUSE

Side Walk

To Service Equipment

Service Drop Clearance Over Roof (With Elevation)

1000 mm BUILDING

Street

HOUSE Side Walk To Service Equipment

3700mm 3700mm Clearance from Ground. Over residential driveways and other drive-in establishment establishment not subject to traffic 

To nearest pole

3700mm

To Service Entrance

Sidewalk

Car port Road

5500mm 5500mm Clearance from Ground. Over public streets, alleys, roads and driveways an other residential properties.

BUILDING

5500mm Side Walk

Side Walk

Roadway

To Service Equipment

3100mm Clearance from ground. Above finished grade, sidewalks and from any platform or projection which might be reached.

BUILDING

3100mm Roadway

Side Walk

Finished Gr ade Line To Service Equipment

Lighting Design Lecture Functional lighting design must consider the interaction among eyesight, objects, and light sources. Good lighting design provides sufficient but not excessive light. Glare from unshielded bulbs or improperly placed lighting should be avoided. Excessive contrast between light and shadows within the same room should also be avoided, especially in work areas. For centuries, candles and oil lamps were the major source of artificial light. Although candles continue to function for special effects, the major  sources of light today are incandescent and fluorescent lamps. Incandescent lamps have a filament (a very thin wire) that gives off light when heated. Fluorescent lamps have an inner coating that gives off visible light when exposed to ultraviolet light. The ultraviolet light is released by a gas inside the fluorescent tube. Incandescent lamps concentrate the light source, while fluorescent lamps provide linear patterns of light. Fluorescent lamps give a uniform glare less light that is ideal for large working areas. Fluorescent lamps give more light per watt, last seven times longer, and generate less heat than incandescent lamps. Light Measurements Human eyes adapt to varying intensities of light. However, they must be given enough time to adjust slowly to different light levels. Sudden extreme changes of light may cause discomfort. Light intensity is measured in units called foot candles. A foot candle is equal to the amount of light a candle casts on an object one foot away. See Figure. 31-8. Ten foot candles (10 fc) equals the amount of light that ten candles throw on a surface one foot away. In the metric system, the standard unit of illumination is the lux (lx). One lux is equal to 0.093 fc. To convert foot candles to lux, multiply by 10.764. See Fig. 31-9. Types of Lighting The three basic types of lighting are general lighting, specific lighting, and decorative lighting. SPECIFIC LIGHTING: Light directed to a specific area or  located to support a particular  task is known as specific, local, or task lighting. See Fig. 31-11. Specific lighting helps in performing such tasks as reading, sewing, shaving, computer work, and home theater viewing. it also adds to the general lighting level. Track lighting and portable lamps provide sources of specif ic indoor   lighting.

GENERAL LIGHTING: General lighting provides overall illumination and radiates a comfortable level of brightness for an entire room. See Fig. 31-10. General lighting replaces sunlight and is provided primarily with chandeliers, ceiling or wall-mounted fixtures, and track lights. To avoid contrast and glare, general lighting should be diffused through the use of fixtures that totally hide the light source or that spread light through panels. Close spacing of hanging fixtures also creates diffuse lighting. Another solution is to use adjustable fixtures so that the light can be directed away from eye contact. W here possible, daylight should be included as a part of the general lighting plan during daylight hours. If adequate window light is not available, the use of skylights should be considered. The intensity of general lighting should between 5 and 10 fc (54 to 108lx). A higher level of general lighting should be used in the service area and bathrooms. Many general lighting fixtures can also be used for decorative lighting by a connection to dimmer switches.

DECORATIVE LIGHTING: Bright lights are stimulating, while low levels of light are quieting. Decorative lighting is used to create atmosphere and interest. Indoor decorative lights are often directed on plants, bookshelves, pictures, wall textures, fireplaces, or any architectural feature worthy of emphasis. Some decorative lighting can be used as general lighting through the use of  dimmer switches. Outdoor decorative lighting can be most dramatic. Exterior structural and landscape features can be accented by wellplaced lights. Outdoor lighting is used to light and accent wall textures, trees, shrubs, architectural features, pools, fountains, and sculptures. See Fig. 31-12. Outdoor lighting is especially needed to provide a safe view of  stairs, walks, and driveways. Remember to

conceal light sources and don't over light. use waterproof devices and an automatic timing device to turn lights on and off.

Light Distribution Light from any artificial source can be distributed (dispersed or directed) in five different ways: direct, indirect, semi=direct, semi-indirect, and diffused. See Fig. 31-13. Direct light shines directly on an object from a light source. Indirect light is reflected from surfaces. Semi direct light shines mainly down as direct light, but a small portion of it is directed upward as indirect light. Semi-indirect light is mostly reflected, but some light shines directly. Diffused light is spread evenly in all directions with the light source (bulb) not visible. Reflection  All objects absorb and reflect light. Some white surfaces reflect 94 percent of the light that strikes them. Some black surfaces reflect only 2 percent. The remainder of the light is absorbed. All surfaces in a room act as a secondary source of light when light is reflected. Refer again to Fig. 31-10. Excessive reflection causes glare. Glare can be eliminated from this secondary source by using matte (dull) finish surfaces and by avoiding exposed light bulbs. Eliminating excessive glare is essential in designing adequate lighting. Structural Light Fixtures Light fixtures are either portable plug-in lamps or structural fixtures. Structural fixtures are wired and built into a building hard-wired. These must therefore be shown on electrical plans and specifications. Structured fixtures may be located on ceilings, on interior and exterior walls, and on the grounds around the building. Different light patterns are produced, depending upon the type of light fixture. Figure 31-14 illustrates the types of structural light fixtures described in the following paragraphs.  

1.00 Soffit lighting is used to direct more light to wall surfaces and to horizontal surfaces, such as kitchen and bath countertops, wall desks, music centers, and computer centers. 2.00

Cove lighting directs light (usually fluorescent) onto ceiling surfaces and indirectly reflects light into the center of a room. The soffit should hide the fixture from view from any position in the room.

3.00 Valance lighting directs light upward to the ceiling and down over the wall or window treatment. Valance faceboards can be flat, scalloped, notched, perforated, papered, upholstered, painted, or trimmed with molding. 4.00 Cornice lighting directs all light downward. It is similar to soffit lighting. except cornice lights are totally exposed at the bottom. Wall Fixtures Wall fixtures are used as a source of general lighting, as well as decorative lighting when attached to a dimmer switch. Wall spotlights or fluorescent fixtures may also be used as task lighting. Wall spotlights for accents, diffusing fixtures for general lighting, and sconces are used extensively on walls. See Fig. 31-15. Vanity lights and fluorescent tube lights are also used on walls as task lighting.

DESIGN COMPUTATION Design Analysis where necessary shall be included on the drawing or may be submitted on separate sheets of uniform size paper, shall show: 1. Illumination design computations and tabulated lighting levels in lux for critical areas in institutional, industrial, recreational and commercial buildings. Provide lighting fixture schedule.

Example: 

General Description and  Application Symbol (1)

Item Number (2)

General Description (3)

Specification Description

Lamp and Power Data

Manufacturer

Typical  Application (4)

Type (5)

Quantity x w/ lamp (6)

Lamp Holder (7)

Supply Volts (8)

Watts per fix and Catalog Number Series (9)

Notes (11)

(10)

1. Legend used 2. Item Number  3. Standard description. Example: Surface-mounted two lamp-40 watts, 230 VAC Industrial-type fluorescent lighting fixture with diffuser with spring loaded lamp holder and high pf energy saving ballast. 4. Where fixture will be mostly likely to be used 5. Ballast type: Electronic or Electromagnetic 6. Lighting Fixture Quantity 7. Type of lamp holder: Twistlock type or Spring type. 8. Voltage requirement 9. Number of lamp times lamp wattage 10. Supplier description and catalog number (if available) 11. Other particular items (dimensions and Gauge size). For Gauge Size use the f ollowing table for reference Table 1: Gauge Size 

Imperial Gauge 10.00 12.00 14.00 16.00 18.00 20.00 22.00 24.00 26.00

Imperial in mm 3.25 2.64 2.03 1.63 1.22 0.91 0.71 0.56 0.46

Metric sheet mm 3.00 2.50 2.00 1.50 1.20 0.90 0.70 0.60 0.50

2. Feed lines and protective devices of motors, electrical equipments and appliances indicating types and ratings. 3. Size of branch circuit wires, feeders, sub-feeders and busbars including protective devices. 4. Size and type of service entrance wires, raceways and equipment. In designing building load. It is essential to consider the simultaneity factor (demand factor) to determine the energy consumption of the building. Use the following table: A p p ro x im ate Valu es fo r s im u ltan eity fac to rs to c o n s u m er s

Office Building 0.80-0.90 0.20-0.40 0.70-0.90 0.80-1.0 0.80-1.0 0.60-0.75 0.50-0.70

System Lighting Outlets HVAC Heating Refrigeration Kitchens Elevators Hoisting Equipment Others Total

0.30-0.40 0.70-0.80

Dem an d Valu es fo r ro u g h es tim atin g

Load

Industr ial

Hospitals

Residentials

Type of Structure

0.95 0.10 0.80-1.0 0.80-1.0 0.90-1.0 0.60-0.75 0.30-0.90 0.80-0.90 0.35-0.45 0.30-0.70

0.70-0.90 0.10-0.20

0.70-0.90 0.10-0.25

0.80-1.0 0.90-1.0 0.60-0.60 0.80-1.0

0.80-1.0 0.90-1.0 0.60-0.80 0.60-0.70

Office Buildings Hospitals Laboratories (including cages) Housing Retail (department stores, etc) Computer Labs Commercial Kitchen

0.30-0.60 0.30-0.60

0.60-0.85 0.60-0.80

(in 2

W/m 50 - 100 120 - 50  100 - 350

Note: * in W per unit ** in W per Diner

 

4-6* 50 - 60 400 - 800 400 - 700**

Depth below site surface for buried conn ections (according to DIN 18012 Europ ean Standard) 

Land Surface 35 - 60 cm

note (for encoding): minimum spacing for meter center (fig 8.18,pg 342) minimum spacing for mvsg (fig 8.19,pg 343) proper installation requirement for indoor oil immerse type xformer (fig 8.22,pg 345) minimum spacing for xformer (fig 8.3,pg 346)

50 - 100 cm

communications supply gas supply 60 - 100 cm

60 - 80 cm high voltage supply

district heat supply 120 - 150 cm water supply

5. Settings / ratings of overcurrent devices. For items 2 to 5 consider the following: a. The maximum allowable voltage drop per wire. Table 2: Maximum Allowable voltage drops (percent) 

Portion of Distribution System

For Lighting and Power Load

For Electrical Heating

For Power Only

1

1

2

1

1

3

3

1

3

5

3

8

Service Entrance to panelboard Feeder to distribution center  Branch circuit to connected load Overall maximum voltage drop

b. Size and installation of wire b.1 See Single Family Dwelling computation below for proper wire sizing. Use the following guidelines: o

b.1.1 The allowable ampacity of conductors is reduced at ambient temperatures higher than 88 F (NEC Wire Ampacity Table 2), and also when more than 3 conductors are installed in the raceway. Sample: o

Two Sets of 120/208-volt, 3Ø, four wire distribution system feeders are installed in a common conduit that passes through a boiler room with a maximum ambient temperature of 102 F. The demand o

current of Feeder 1 is calculated to be 100A, and that for Feeder 2 is 50A. Determine the feeder sizes based on 90 C copper wires (cables), and select the common conduit size. Assume selected feeders are type THHN copper.  Answer:

There are four wires in each set of feeders, or eight for Feeders 1 and 2. Theoretically, the neutral conductor may not carry any current if the load is balanced between Phases A, B, and C. However, recent design practices have to treat the neutral conductor as a current-carrying conductor, due to the third harmonics of inductive loads such as PC and electronic appliances. From NEC Table 3, a correcting (derating) factor of 0.7 must be applied. o

o

The ambient temperature in the boiler room is 102 F; thus, a correction (derating) factor of 0.91 nuts be applied for the 90 C rated wires (cable) (see NEC Table 2). The overall derating factor for ampacity is 0.70 x 0.91 = 0.637; thus, Feeder 1 must be selected for 100A / 0.637 = 157A, and Feeder 2 must be selected for 50A / 0.637 = 78.5A. From NEC Table 1, Feeder 1 must be a minimum size of 1/0 AWG, which is rated for 170A under normal condition, and Feeder 2 must be a minimum size of No. 4 AWG. From NEC Table 5 No. 1/0 THHN cable has 0.1893 sq.in. of cross-sectional area, and that for No. 4 cable is 0.0845 sq.in. The total cross-sectional area of all the cables is: [{(4) x 0.1893} + {(4) x 0.0845}] = 1.160 sq.in. Based on the maximum 40% fill rule, the conduit must have a minimum cross-sectional area of 1.160 / 40 percent or 2.9 sq.in. From NEC Table 4 a 1 1/2 inch conduit has a cross-sectional area of 2.04 sq.in. Thus, the next larger size 2-inch conduit having a cross-sectional area of 3.36 sq.in must be used. b.1.2 The installation of wires (or cables) in raceway is strictly regulated. Generally, no more than 40% of the cross sectional area of the raceway can be filled with wires or cables. The limitation is necessary for 2 reasons: I. To prevent excessive heat build-up. even a fire.

All wires have resistances and impedances that creates loss that turns into heat and, if unabated, may cause the breakdown of the insulation material or

II. To permit the physical installation of wires. damage.

Wires in conduits must be pulled into the conduits by special tools. A clear space must be provided for the wires to be pulled in easily, without

b.1.3 When the raceway (conduit) is too long or contains too many bends, pull box must be installed at the location to facilitate the pulling of conductors into the raceway. I. For Angle or U Pull Box: For boxes where the conductors are pulled at an angle or in a "U" condition, the distance between each conduit entry inside the box, and the opposite wall of the box should not be less than six times the trade diameter of the largest conduit  , and the distance must be increased for additional conduit entries by the amount of the sum of the diameter of all other conduit entries on the same wall of the box . the distance between the conduit entries should not be less than six times the trade diameter of the largest raceway  .

L1

25mm

L2 40mm

25m

40mm

Sample: The 40mm diameter conduit is the largest therefore: L1 = 6 x 40mm + (25mm + 25mm) = 290 mm (minimum) L2 = 6 x 40mm + (25mm) = 265mm (minimum) D = 6 x 40mm = 240mm (minimum) where D = distance between raceway entries enclosing the same conductor 

II. For Straight Pull: In straight pulls, the length of the box should not be less than eight times the trade diameter of the largest conduit  . The depth of the box should be sufficient enough to permit installation of the largest lock nut and bushing of the conduit including the spacing between the adjacent conduit entries. 25mm dia

H 40mm

Sample: The 40mm diameter conduit is the largest therefore: L = 40mm x 8 = 320mm H = whatever height necessary to provide proper installation of the conduit locknuts and bushing within the enclosure.

L b.1.4 When the conductors need to be spliced, a junction box is required. No conductor is allowed to have splice within a raceway other than at the junction boxes or within equipment enclosures. b.2 with respect to voltage drop Use the f ollowing computation in determining the voltage drop CM = (25 x I x L) / Vdrop (based on NEC computation) where: CM = circular mil I = Full Load current (100%) L = Length (in feet) V drop = Voltage Drop (see table 2 for reference) Sample: Panelboard LP A @ 100% load: 117.76 Amperes Distance from Panelboard to EE room: 80 meters CM = (25 x I x L) / Vdrop where : I = 117.76 A L = 80m(100cm / m)(1 in / 2.54cm)(I ft / 12in) = 262.47feet V drop (set at 5%) = 240 x 0.05 = 12.0v CM = (25 x 117.76 x 262.47) / 12.0 = 64,392.64 CM 2  A = d finding d d = sq.rt (64392.64) = 253.76 = 253.76 CM (1in / 1000mils)(25.4mm/in) = 6.445 mm  A = 3.1416 x (6.445)2 / 4 2 2 safe  A = 32.63 mm  or 38 mm therefore Use 1 set of 3 #38mm2 and 1 #22mm2 THHN in 40Ø IMC NUMBER OF DISCONNECTING MEANS: The service disconnecting means for each set or for each sub-set of service entrance conductors shall consist of not more than six switches or six circuit breaker mounted in a single enclosure, in a group of separate enclosures, or on a switchboard. LOCATION: The service disconnecting means shall be installed either inside or outside of a building or other structure at a readily accessible location nearest to the point of entrance of the service entrance conductor. RATING: The service disconnecting means shall have a rating not less than the load to be carried. IN NO CASE SHALL THE RATING BE LOWER THAN SPECIFIED THROUGH: a. ONE CIRCUIT INSTALLATION - The service disconnecting means shall have a rating of not less than 15 amperes. b. TWO CIRCUIT INSTALLATION - The service disconnecting means shall have a rating of not less than 30 amperes. c. ONE FAMILY DWELLING - The service disconnecting means shall have a rating of not less than 100 amperes, 3 wire under either of the following conditions: 1. Where the initial computed loads is 10 KW or more: 2. Where the initial installations consist of six or more 2 wire branch circuit. d. ALL OTHERS - for all other installations the service disconnecting means shall have a rating of not less than 60 amperes. Note: 

- The service disconnecting means shall simultaneously disconnect all ungrounded conductors and shall be capable of being closed on a fault to or  greater than the maximum available short-circuit current. - The service entrance conductors shall have a short-circuit protective device in each underground conductors. - Fuses shall have an interrupting rating not less than the maximum available short circuit current in the circuit at their supply terminals. - Circuit Breakers shall be free to open in case the circuit is closed in the overload. Circuit Breakers shall have an interrupting rating no less than the maximum available short-circuit at its terminals. ELECTRICAL WIRING DESIGN OF A SINGLE FAMILY DWELLING Principles: 1. Secure the architectural plan of the building to be lighted. 2. Determine the loads and systems to be provided like air-conditioning units , electric range, washing machine and other appliances. 3. Determine the location and concentration of loads and specify the location of electrical devices, appliances and controls in the architectural plan., 4. Determine the number of branch circuits conductors to be provided. Compute their corresponding sizes basing from the known electrical loads. 5. Determine the number and rating of feeders for lightning and power. 6. Determine the rating and sizes of the service equipment and service entrance. 7. Draw the wiring diagram. Make the location plan. Write the specification and draw the symbols and legends used. 8. Estimate the cost of the project. LOADS AND SYSTEMS TO BE PROVIDED IN A SINGLE FAMILY DWELLING: Branch circuits and feeder calculations (Article 3.3 of P.E.C) 1. General Lightning Load: Read rule 3.3.1.2 (b) Use table 3.3.1.2 (b) 2. Small Appliances: Read rule 3.3.1.3 (b)  And rule 3.1.2.7 (b) 3. Cooking Range: Read rule 3.1.2.1 (b)  And rule 3.3.2.10 Use Table 3.3.2.10 4. Clothes Dryer: Read rule 3.3.2.9 Use table 3.3.2.9 5. Laundry Loads: Read rule 3.3.2.7 (b) Read rule 3.3.1.3 © 6. Water Pump (motor): Read article 6.6 Use table 6.6.12.2 Tables 6.6.12.3 Tables 6.6.12.4 7. Air Conditioning Units: Read article 6.7 Section 6.6.2 8. Permissible loads: Read rule 3.1.2.5 9. Fixed Appliances: Read rule 3.3.2.8 10. Standard sizes of overcurrent protections: Read rule 4.5.1.5 11. Feeder Neutral Load: Read rule 3.3.2.13 12. Sizes and ampacity of conductor  Use table 5.3.2.4 13. Sizes of Conduit: Use table 12.1.1.3 (a to c)

page 52 page 53 page 55 and rule 3.3.2.7 (a) page 57 page 48 page 45 page 58 page 59 page 57 page 58 for demand factor   page 57 page 55 pages 335-370; section 6.6.2 page 344 page 366 for single phase motors page 367 For two and three motor  page 366 page 371-380 same as motors page 47 page 57 page 151 page 58 page 182 page 678 to 680

SINGLE FAMILY DWELLING DESIGN Design a single family dwelling with the following electrical loads: small appliance load = 3000 watts 1 - 12 kw electric range 1 - 2.5 kw water heater  2 - 1Hp ACU 1 - 1/2 Hp ACU

Note: The area of the dwelling unit is 150 square meters

1 - 5kw washing machine Using conventional method (Area method), design the electrical system. Computations:  2

2

For General Lighting load (150m ) x (24 W/m ) For small appliance load compute load without electric range  Application of Demand Factors First 3000 at 100% demand factor Excess of 3000VA (6600-3000) at 35% Other Loads: Electric Range washing Machine Two 1 Hp air conditioning unit (2 x 8 x 230) water Heater One 1/2 Hp ACU (4.9 x 230) 25% of largest motor (0.25 x 8 x 230) Total Computed load with electric range

= =

3,600.00 3,000.00 6,600.00

= =

3,000.00 1,260.00 4,260.00

= = = = = =

8,000.00 5,000.00 3,680.00 2,500.00 1,127.00 460.00 25,027.00

Main Feeder full load current: IL = 25027 / 230 = 108.81 amperes For Main Feeder service entrance conductor: 2

Use 2 - 38mm  THW copper conductor (minimum) Use 125A , 250V, 2 pole Circuit Breaker, 300AF For Service neutral conductor: IN = 70% (108.81) = 78.17 amperes 2

Use 1 - 22mm THW copper conductor Size of Conduit: Use 32mm phase rigid steel conduit (RSC) Load Schedule Circuit No.

L.O.

1

10

2 3 4 5 6 7 8 9 10

10

C.O

8 8

Load Description

Switch

Power

Voltage

Current

Amp trip

Amp Frame

Circuit No.

Conductor

10 - 40 w Fluorescent Lamp

10

400w

230v

1.74

15

30

1

2.0 mm

8 - 40 watts 8 - 180 watts 8 - 180 watts 1 - 12kw Electric Range 1 - 5kw Washing Machine 1 Hp - ACU 1 Hp - ACU 1 Hp - ACU One 1/2Hp ACU

10

320w 1440w 1440w 12000w 5000w

230v 230v 230v 230v 230v 230v 230v 230v 230v

1.39 6.26 6.26 52.17 21.74 8.00 8.00 8.00 4.90

15 15 20 20 60 30 20 20 20

30 30 30 100 60 30 30 30 30

2 3 4 5 6 7 8 9 10

2.0 mm 2 3.5 mm 2 3.5 mm 2 14 mm 2 5.5 mm 2 3.5 mm 2 3.5 mm 2 3.5 mm 2 3.5. mm

Design the electrical system of a single family with one hundred sq meters (100 sq. m) and with the following connected loads: 2 small appliances at 1500 w each One 15 kw electric range One 4.5 kw electric range One 1.2kw washing machine One 5kw clothes dryer  Two 1.5Hp ACU One 3/4 Hp ACU Compute for the size of the feeder and the main circuit breaker  Computations: 

General Lightning Load (100sqm (24w / sqm) Small Appliance Load = 2(1500) total computed load without fixed appliances  Application of Demand factor: First 3000 w at 100% demand factor excess at 35% demand factor total computed load without fixed appliances Other load: One 15kw Electric range = 8 + 8(15-12)5% One 4.5kw oven = 4.5(80%) One 1.2kw washing machine One 5kw clothes dryer total computed load without ACU computed current, I = 22840 / 230 Two 1 1/2 Hp ACU = 2(10) One 3/4 Hp ACU Plus 25% of the full load current of highest motor total load current Maximum Ampacity of subfeeder circuit: I = 125% (128.7) + 25%(10) Therefore:

= =

2,400.00 3,000.00 5,400.00

= =

3,000.00 840.00 3,840.00

= = = =

9,200.00 3,600.00 1,200.00 5,000.00 22,840.00 99.30 20.0 A 6.90 A 2.50 101.80

=

=

163.38 A

= = = =

3,000.00 6,440.00 2,550.00 3,500.00 15,490.00

= =

67.22 A 84.00 A

2

Use: 2 - 60mm  THW Note: 125% is for safety allowance Subfeeder neutral conductor (line to line voltage 230): small appliance load electric range = 9200 (70%) oven = 3600 (70%) clothes dryer = 5000 (70%) total load Neutral current I = 15490 w / 230 v I = 67.22 (125%) 2

Use:

2 - 60mm  THW copper conductor  2 1 - 30mm  THW co er conductor  conduit size: 1 - 40mm dia Rigid Steel Conductor (RMC) Size of Circuit Breaker : Use 175A / 200AF, 250, 2 pole Wiring Design Computation for Feeder (6-dwelleing units) 2

2

General Lighting = 6 (100m ) (24 w/m ) Small Appliance load = 6 (2)(1500) Computed Load for gen lighting & small appliance  Application of demand factor: First 3000w at 100% demand factor Excess at 35% demand factor Net computed load Other Loads 6 - 15kw E.R = 21 + (15-12)(5%)(21) 6 - 4.5 kw oven = 6(4.5)(0.43) 6 - 5 kw clothes dryer = 6(5)(70%) 6 - 1.2 kw washing machine Computed load without A.C.U Current I = 77250 w / 230v 6 - 1.5 Hp ACU = 2(6)(10) 6 - 3/4 Hp ACU = 6(6.9) plus 25% of full load current of highest motor of the 6 units = (lo)(25%) feeder load current minimum ampacity of circuit conductor  I = 125% (499.17) + 25%(10) number of conductor size available = 626.46 / 2

= = =

14,400.00 18,000.00 32,400.00

= =

3,000.00 10,290.00 13,290.00

= = = = =

24,150.00 11,610.00 21,000.00 7,200.00 77,250.00

= = =

335.87 120.00 1.40

=

2.50 499.17

=

626.46

=

313.23

=

18,000.00

= =

3,000.00 5,250.00

= = = =

16,905.00 8,127.00 14,700.00 47,982.00 208.60

= = =

200.00 6.02 206.02

2

use 4 - 200mm  THW (2 conductors in parallel) minimum ampacity of feeder neutral conductor  IN = 313.23(70%) = 219.26A  Another computation for feeder neutral: small appliance load = 6(2)(1500) application of demand factor  first 3000 w at 100% demand factor excess at 35% demand factor 35%(18000-3000) other loads: electric range = 24150 (70%) oven = 11610 (70%) clothes dryer = 21000 (70%) total neutral current feeder neutral current = 47982 / 230 application of demand factor: 200A at 100% demand factor excess at 70% demand factor = 8.6(70%) feeder neutral current for safety allowance IN = 125%(206.02) = 257.52

128.70 A

Poles

Conduit

2

2

15mm phase RSC

2

2 2 2 2 2 2 2 2 2

15mm phase RSC 15mm phase RSC 15mm phase RSC 20mm phase RSC 15mm phase RSC 15mm phase RSC 15mm phase RSC 15mm phase RSC 15mm phase RSC

Therefore: 2

use : 4 - 200mm  THW copper conductor  2 1 - 125mm  THW copper conductor  conduit : use 2 - 80mm dia RSC Maximum ampacity of feeder circuit overcurrent protective device: use 600AT / 1000AF, 250V circuit breaker  Note : Washing machine may be included in small appliance load, however, washing machine is not included in other loads to reduce size of conductor.

DESIGN OF COMMERCIAL BUILDING Less than 400 sq. ft - Provide at least 1 convenience outlet for every 20 ft (6 meters). First 400 sq. ft or 37 sq. m----------------------------------------------4 convenience outlet  Additional 400 sq. ft------------------------------------------------------2 convenience outlet Fraction--------------------------------------------------------------------2 convenience outlet LOAD SCHEDULES Panel Board LPA

Ckt. No.

Circuit Breaker Rating

Load Description

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

F 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50

T 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15

P 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2

100w 10 8 8 8 8 8 5 9

16

50

15

2

10

17

50

15

2

Spare

18 19 20 21

50 50 50 50

15 15 15 15

2 2 2 2

Spare Spare Spare Space

40w

4

Switches S1 4

1 3

S2 1 1 1 1 1 1

S3

hase Current B 4.35 3.48

S3w

3.48 3.48 3.89 3.91

1 3 2 4

5.16 4.78

1 1

4.35 3.48

12 8 8

BC

3.48 3.48

12 11 10 8

C

5.16 3.48

3 2

3.48

1

1

2 - 3.5

4.35 10

Stub out

10

Stub out Stub out Stub out Stub out

10 10 34.27

Total 

No., type and size of wire Diameter of 2 RSC ( TW / mm ) 2 - 3.5 15 2 - 3.5 15 2 - 3.5 15 2 - 3.5 15 2 - 3.5 15 2 - 3.5 15 2 - 3.5 15 2 - 3.5 15 2 - 3.5 15 2 - 3.5 15 2 - 3.5 15 2 - 3.5 15 2 - 3.5 15 2 - 3.5 15 2 - 3.5 15

34.73

34.79

C

BC

15

Panel Board LPB

Ckt. No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Circuit Breaker Rating F 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50

T 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15

Load Description P 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2

100w 10 9 6 9 9 12 10 9 8 10 10 10 Spare Spare Spare Space

40w

Switches S1

S2

S3

hase Current B 4.4 3.9

S3w 7

1 1

1

1 1 2 1

2 2

2.6 3.9

1 1 1 1

3.9 5.2 4.4 4.4 3.5 4.4

1 1 1

4.4 4.4 10 10 10 27.1

Total 

24.4

27.9

Panel Board LPC 

Ckt. No.

Circuit Breaker Rating

Load Description

Phase Current

F

T

P

C.O 180 VA

AB

1 2 3 4 5 6 7

50 50 50 50 50 50 50

15 15 15 15 15 15 15

2 2 2 2 2 2 2

6 6 6 6 7 7 6

4.70 4.70

8

50

15

2

Spare

10.00

9 10

50 50

15 15

2 2

Spare Space

CA

BC

No., type and size of wire ( Diameter of 2 RSC TW / mm ) 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5

4.70 4.70 5.48 5.48 4.70

Stub Out Stub Out

10.00 Total 

24.10

15 15 15 15 15 15 15

19.40

10.96

Panel Board LPD

Ckt. No. 1 2 3 4 5 6 7 8

Circuit Breaker Rating

Load Description

Phase Current

F

T

P

C.O 180 VA

AB

50 50 50 50 50 50 50 50

15 15 15 15 15 15 15 15

2 2 2 2 2 2 2 2

7 6 6 6 6 6 Spare Spare

5.48 4.70

CA

BC

No., type and size of wire ( Diameter of RSC TW / mm 2) 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 Stub Out Stub Out

4.70 4.70 4.70 4.70 10.00 Total 

20.18

10.00 19.40

CA

15 15 15 15 15 15

9.40

Panel Board PPA

Ckt. No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

Circuit Breaker Rating

Load Description

T

P

C.O 180 VA

AB

50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50

20 20 20 20 20 30 20 20 20 20 20 30 20 20 30 20 30 20 20 20 20

2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 2 2 2 2

1 - HP ACU 1 - HP ACU 1 - HP ACU 1 - HP ACU 1.5 - HP ACU 1 - HP ACU 1 - HP ACU 1 - HP ACU 1 - HP ACU 1 - HP ACU 1 - HP ACU 1.5 - HP ACU 1 - HP ACU 1 - HP ACU 1 - HP ACU 1 - HP ACU 3 - HP ACU Spare Spare Spare Spare

8.00 8.00

Total 

.,

Phase Current

F

BC

3Ø

8.00 8.00 10.00 8.00 8.00 8.00 8.00 8.00 8.00 10.00 8.00 8.00 10.00 8.00 9.60 10.00 10.00 10.00 58.00

10.00 60.00

56.00

9.60

2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 Stub out Stub out Stub out Stub out

Diameter of RSC 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15

No., type and size of wire Diameter of RSC ( TW / mm 2) 2 - 3.5 15 2 - 3.5 15 2 - 3.5 15 2 - 3.5 15 2 - 3.5 15 2 - 3.5 15 2 - 3.5 15 2 - 3.5 15 2 - 3.5 15 2 - 3.5 15 2 - 3.5 15 2 - 3.5 15 Stub out Stub out Stub out

Panel Board PPB

Circuit Breaker Rating

Ckt. No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

Load Description

Phase Current

F

T

P

C.O 180 VA

AB

50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50

30 30 30 30 30 30 20 20 30 30 20 20 30 20 20 20 20 30 30 30 30

2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2

1.5 - HP ACU 1.5 - HP ACU 2 - HP ACU 2 - HP ACU 1.5 - HP ACU 1.5 - HP ACU 1 - HP ACU 1 - HP ACU 1.5 - HP ACU 1.5 - HP ACU 1 - HP ACU 1 - HP ACU 2 - HP ACU 1 - HP ACU 1 - HP ACU 1 - HP ACU 1 - HP ACU Spare Spare Spare Spare

10.00 10.00

Total 

CA

BC

No., type and size of wire ( Diameter of 2 RSC TW / mm ) 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 2 - 3.5 Stub out Stub out Stub out Stub out

12.00 12.00 10.00 10.00 8.00 8.00 10.00 10.00 8.00 8.00 12.00 8.00 8.00 8.00 8.00 10.00 10.00 10.00 100.00

10.00 54.00

15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15

46.00

Main Distribution Panel MDP 

Panel

Ckt. No. 1 2 3 4 5 6 7 8

Phase Current

No., type and size of wire

Designation

AB

CA

BC

3Ø

(mm )

Diameter of RSC

LPA LPB LPC LPD PPA PPB Spare Spare

34.27 26.52 24.10 20.18 58.00 66.00 0.00 0.00 229.07

34.79 27.83 10.96 9.40 56.00 64.00 0.00 0.00 202.98

34.73 24.35 19.40 19.40 60.00 70.00 0.00 0.00 227.88

0.00 0.00 0.00 0.00 9.60 0.00 0.00 0.00 9.60

3 - 22 - TW 3 - 14 - THW 3 - 14 - THW 3 - 14 - TW 3 - 38 - THW 3 - 50 - THW

28 25 25 25 32 40

Total 

2

Computations I 3ØE  Allowance 20% MATCC Use :

= 9.6 + 1.73(229.01) = 1.20 (406.26) = 406.26 + 1.73(0.25)(12)

= 406.26 A = 487.50 A = 411.45

If exceeds 267 A initial load, 50% Allowance

2

3 - 325 mm  THW (435 / 411.45 A) RS and 80mmØ 2 50mmØ 6 - 100 mm  THW (220 / 205.73A) 2 40mmØ 9 - 50mm  THW 145 / 137A

MROFCCPD = 30 + 1.73(229.01-12) + 9.6 = 415.47A (1.2) = 498 A Use : 500 AT / 600AF, 3P, ACB Type LA Panel Board LPA

No., type and size of wire

Design Computation

(mm 2)

Diameter of RSC

AT

AF

10 (100) / 230 = 4.35A

2 - 3.5 - TW

15.00

15

50

2

8(100) / 230 = 3.48A

2 - 3.5 - TW

15.00

15

50

3

8(100) / 230 = 3.48A

2 - 3.5 - TW

15.00

15

50

4

8(100) / 230 = 3.48A

2 - 3.5 - TW

15.00

15

50

5

8(100) / 230 = 3.48A

2 - 3.5 - TW

15.00

15

50

I 3ØE = 1.73 (34.79) = 60.26A

6

8(100) / 230 = 3.48A

2 - 3.5 - TW

15.00

15

50

MAFCC = 1.25 (60.26) = 75.35A

7

5(100)/230 + 4(0.43) = 3.89

2 - 3.5 - TW

15.00

15

50

8

9(100) / 230 = 3.91A

2 - 3.5 - TW

15.00

15

50

9

12(0.43) = 5.16A

2 - 3.5 - TW

15.00

15

50

10

11(100) / 230 = 4.78A

2 - 3.5 - TW

15.00

15

50

11

10(100) / 230 = 4.35A

2 - 3.5 - TW

15.00

15

50

12

8(100) / 230 = 3.48A

2 - 3.5 - TW

15.00

15

50

I 3ØE = 1.73 (27.83) = 48.20 A

13

12(0.43) = 5.16A

2 - 3.5 - TW

15.00

15

50

MAFCC = 1.25 (48.20) = 60.25A

14

8(100) / 230 = 3.48A

2 - 3.5 - TW

15.00

15

50

15 16 17 18 19 20 21

8(100) / 230 = 3.49A 10(100) / 230 = 4.35A Spare = 10 Spare = 10 Spare = 10 Spare = 10 Space

2 - 3.5 - TW 2 - 3.5 - TW 2 - 3.5 - TW 2 - 3.5 - TW 2 - 3.5 - TW 2 - 3.5 - TW 2 - 3.5 - TW

15.00 15.00 Stub Out Stub Out Stub Out Stub Out

15 15

50 50

use : 3 - 22mm2 TW (70 / 60.25A) or 3 - 14mm   2 THW (65 / 60.25) MRCFCOPD : 70 AT / 100AF; 3P

No., type and size of wire

Diameter of RSC

AT

AF

15.00

15

50

I 3ØE = 1.73(20.18) = 34.95 MAFCC = 1.25 (34.95) = 43.69 A

Ckt. No.

Phase Current I

1

MAFCC : Minimum Ampacity of Feeder Current Conductor  : at 125% of Full Load Current MROFCOPD : Maximum Rating of Feeder Circuit Over Current Protective Device LPA

32 mm Ø RSC 25 mm Ø RSC

MRCFCOPD : 70 AT / 100AF; 3P, ACB Molded Case Type EB LPB RSOR: 32 mm Ø RSC 25 mm Ø RSC

LPC I 3ØE = 1.73(24.10) = 41.74 MAFCC = 1.25 (41.74) = 52.18A use : 3 - 14mm2 TW (55 / 52.18) A or  3 - 14mm2 THW (65 / 52.18) A MRCFCOPD : 50 AT / 50 AF, 3P, ACB Type EB

Panel Board LPB

Ckt. No.

Phase Current I

1

10(100) / 230 = 4.35A

(mm ) 2 - 3.5 - TW

2

9(100) / 230 = 3.91A

2 - 3.5 - TW

15.00

15

50

3

6(100) / 230 = 2.61A

2 - 3.5 - TW

15.00

15

50

4

9(100) / 230 = 3.91A

2 - 3.5 - TW

15.00

15

50

5

9(100) / 230 = 3.91A

2 - 3.5 - TW

15.00

15

50

6

12(100) / 230 = 5.22A

2 - 3.5 - TW

15.00

15

50

7

10(100) / 230 = 4.35A

2 - 3.5 - TW

15.00

15

50

8

9(100) / 230 = 3.91A

2 - 3.5 - TW

15.00

15

50

I 3ØE = 1.73(20.18) = 34.95

9

8(100) / 230 = 3.48A

2 - 3.5 - TW

15.00

15

50

MAFCC = 1.25 (34.95) = 43.69 A

10

10(100) / 230 = 4.35A

2 - 3.5 - TW

15.00

15

50

11

10(100) / 230 = 4.35A

2 - 3.5 - TW

15.00

15

50

12

10(100) / 230 = 4.35A

2 - 3.5 - TW

15.00

15

50

13 14 15 16

Spare = 10 Spare = 10 Spare = 10 Space

2 - 3.5 - TW 2 - 3.5 - TW 2 - 3.5 - TW 2 - 3.5 - TW

Stub Out Stub Out Stub Out Stub Out

No., type and size of wire

Diameter of RSC

AT

AF

15.00

15

50

2

RSOR:

use : 3 - 30mm2 TW (90 / 75.33A) or 3 - 22mm 2 THW (85 / 75.33A)

RSOR: 25 mm Ø RSC 25 mm Ø RCP

LPD RSOR:

use : 3 - 14mm2 TW (55 / 43.69) A or 3 - 8mm2 THW   (45 / 43.69) A

25 mm Ø RSC 25 mm Ø RSC

MRCFCOPD : 50 AT / 50 AF, 3P PPA RSOR:

use : 3 - 14mm2 TW (55 / 43.69) A or

25 mm Ø RSC

2

3 - 8mm   THW (45 / 43.69) A

25 mm Ø RSC

MRCFCOPD : 50 AT / 50 AF, 3P PPB I 3ØE = 1.73(70) = 121.4 A MAFCC = 121.24 + 0.25(1.73)(12) = 126.44A use : 3 - 60mm2 TW (135 / 126.44) A or  3 - 50mm2 THW (145 / 126.44) A

Panel Board LPC 

RSOR: 40 mm Ø RSC 40 mm Ø RCP

MRCFCOPD : 30 + 1.73(70 - 12) = 130.46A use : 125 AT / 225AF, 3P, ACB Type, Molded Case Type CA / CAB

Ckt. No.

Phase Current I

1

6(180) / 230 = 4.7A

(mm ) 2 - 3.5 - TW

2

6(180) / 230 = 4.7A

2 - 3.5 - TW

15.00

15

50

3

6(180) / 230 = 4.7A

2 - 3.5 - TW

15.00

15

50

4

6(180) / 230 = 4.7A

2 - 3.5 - TW

15.00

15

50

5

7(180) / 230 = 5.48A

2 - 3.5 - TW

15.00

15

50

6

7(180) / 230 = 5.48A

2 - 3.5 - TW

15.00

15

50

7

6(180) / 230 = 4.7A

2 - 3.5 - TW

15.00

15

50

8

Spare = 10

2 - 3.5 - TW

Stub Out

6 - 100 mm2 THW

50 mm Ø

9 10

Spare = 10 Space

2 - 3.5 - TW 2 - 3.5 - TW

Stub Out Stub Out

9 - 50mm 2 THW MROFCOPD : 30 + 1.73(229.01- 12) + 9.6 = 415.47A x 1.2 = 498.57A use: 500 AT / 600AF, 3P, ACB Type LA

40 mm Ø

2

MPB - Main Panel Board I 3ØE = 9.6 + 1.73(229.01) = 406.26A Allowance 20% = 1.20 (406.26) = 487.5A MAFCC = 406.26 + 0.25(1.73)(12) = 411.45A or = 9.6 + 1.73(229.01 - 12) + 1.25(12)(1.73) = 411.25A use: 3 - 325 mm2 THW

RSOR: 80 mm Ø RSC

Panel Board LPD

No., type and size of wire

Ckt. No.

Phase Current I

(mm )

Diameter of RSC

AT

AF

1

7(180) / 230 = 5.48A

2 - 3.5 - TW

15.00

15

50

2

6(180) / 230 = 4.7A

2 - 3.5 - TW

15.00

15

50

3

6(180) / 230 = 4.7A

2 - 3.5 - TW

15.00

15

50

4

6(180) / 230 = 4.7A

2 - 3.5 - TW

15.00

15

50

5

6(180) / 230 = 4.7A

2 - 3.5 - TW

15.00

15

50

6

6(180) / 230 = 4.7A

2 - 3.5 - TW

15.00

15

50

7 8

Spare = 10 Spare = 10

2 - 3.5 - TW 2 - 3.5 - TW

Stub Out Stub Out

2

Panel Board PPA

Full Load

Ampere

Ampere

Current

Trip

Frame

Max Ampacity of Motor Br. Ckt. Conductor 

No, Type and Size of wire

Size of Conduit mmØ

1

1 HP = 8A

2.5(8) = 20

50

1.25(8) = 10

2 - 3.5 - TW

15

2

8

20

50

1.25(8) = 10

2 - 3.5 - TW

15

3

8

20

50

10.00

2 - 3.5 - TW

15

4

8

20

50

10.00

2 - 3.5 - TW

15

5

10

2.5(10)=25 or 30

50

1.25(10) = 12.5

2 - 3.5 - TW

15

6

8

20

50

10.00

2 - 3.5 - TW

15

7

8

20

50

10.00

2 - 3.5 - TW

15

8

8

20

50

10.00

2 - 3.5 - TW

15

9

8

20

50

10.00

2 - 3.5 - TW

15

50

10.00

2 - 3.5 - TW

15

50

10.00

2 - 3.5 - TW

15

2 - 3.5 - TW

15

Ckt. No.

10

8

11

8

20 20

12

10

30

50

12.50

13

8

20

50

10.00

2 - 3.5 - TW

15

14

8

20

50

10.00

2 - 3.5 - TW

15

15

10

30

50

12.50

2 - 3.5 - TW

15

16

8

20

50

10.00

2 - 3.5 - TW

15

17

9.6

2.5(9.6)=24 or 30

50

1.25(9.6) = 12

2 - 3.5 - TW

15

18

10

30

50

12.50

2 - 3.5 - TW

15

19

10

30

50

12.50

2 - 3.5 - TW

15

20 21

10 10

30 30

50 50

12.50 12.50

2 - 3.5 - TW 2 - 3.5 - TW

15 15

Full Load

Ampere

Ampere

Current

Trip

Frame

Max Ampacity of Motor Br. Ckt. Conductor 

No, Type and Size of wire

Size of Conduit mmØ

1

10

30

50

1.25(8) = 10

2 - 3.5 - TW

15

2

10

30

50

1.25(8) = 10

2 - 3.5 - TW

15

3

12

30

50

10.00

3 - 3.5 - TW

15

4

12

30

50

10.00

4 - 3.5 - TW

15

5

10

30

50

1.25(10) = 12.5

5 - 3.5 - TW

15

6 - 3.5 - TW

15

7 - 3.5 - TW

15

Panel Board PPB

Ckt. No.

6 7

8

20

50

10.00

8

8

20

50

10.00

8 - 3.5 - TW

15

9 - 3.5 - TW

15

9

8

20

50

10.00

10

8

20

50

10.00

10 - 3.5 - TW

15

11

8

20

50

10.00

11 - 3.5 - TW

15

12

10

30

50

12.50

12 - 3.5 - TW

15

13

8

20

50

10.00

13 - 3.5 - TW

15

14

8

20

50

10.00

14 - 3.5 - TW

15

15

10

30

50

12.50

15 - 3.5 - TW

15

16

8

20

50

10.00

16 - 3.5 - TW

15

17

9.6

2.5(9.6)=24 or 30

50

1.25(9.6) = 12

17 - 3.5 - TW

15

18

10

30

50

12.50

18 - 3.5 - TW

15

19

10

30

50

12.50

19 - 3.5 - TW

15

20 21

10 10

30 30

50 50

12.50 12.50

20 - 3.5 - TW 21 - 3.5 - TW

15 15

 A LPA Details B C  A

1 3 5

 A

2 4 6

1 3 5

LPB Details B C

B

C

LPC Details

1

2

3

4

5

6

7

8

2 4 6

7

8

7

8

9

10

9

10

11

12 11

13

14 13

9

12 LPD Details  A

14 15

16 15

17

18

19 20

B

C

1

2

3

4

5

6

7 8

PPA Details  A

B

PPB Details

C

 A

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

B

C

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

18

19

20

21

22

19 20 21

RISER D IAGRAM

PPB

LPD

LPB GND Service Drop 3Ø, 3 -wire 230V, 60 Hz

WG GND GND

PPA

LPC

LPA

MDP

M

Service KWHR Meter  (By others)

WIRE GUTTER

Riser : Single Line Diagram (Not to Scale) 2

Required Grounding conductor is N o. 50mm  THW 2

3# - 325mm  THW in 80mm Ø RSCP (ungrounded conductor) GROUNDING ELECTRODE CONDUCTOR FOR AC SYSTEM: Size of Largest Service 2

Minimum Size of grounding Conductor / Equipment:

Size of Grounding Electrode 2

Entrance Copper (mm )

Conductor Copper (mm )

38 or smaller  38 - 50 60 - 80 80 - 200 200 - 325 325 - 500

8 14 22 30 50 60

Rating of Over Current Protective Device

Size of mm  copper 

15 20 30 40 60 100 200 400 600 800 1000 1200 1600 2000 2500 3000 4000

2 3.5 5.5 5.5 5.5 8 14 30 38 50 60 80 100 125 200 200 250

2

Service Entrance Adequacy Standards Conductor Size Initial Load Service 2 (A) Switch (A) AWG mm  1 - 23 60 8 8 24 - 33 60 6 14 34 - 47 100 4 22 48 - 60 100 2 30 61 - 67 100 1 38 68 - 83 200 110 50 84 - 100 200 210 60 101 - 117 200 310 80 118 - 133 200 410 100 134 - 152 400 410 100 153 - 167 400 250 125 168 - 183 400 300 150 184 - 200 400 350 175 201 - 217 400 400 200 218 - 267 400 500 250

2

50mm

SOLID NEUTRAL COPPER BAR 2

No. 38mm  Bare Copper wire / insulated UNGROUNDED CONDUCTOR

GROUNDING CONNECTOR

MDP

DESIGN OF AN INDUSTRIAL PLANT Maximum Number of Outlets Required: Manufacturing Spaces 6 Storage Spaces 6 Offices 8 For every 40 watts fluorescent lamp, the input power (high power factor ballast) 52 watts For every 40 watts fluorescent lamp, the current drawn by the ballast is 0.43 current For ordinary 20 watts fluorescent lamp, the current drawn by the ballast is 0.23 current For every convenience outlet (duplex), the power is 180 volt amp Note: Provide at least one spare branch circuit for every five branch circuits. Maximum Ampacity of Motor (Branch circuit conductor) 1.25 Full Load current For Fused-Motors 3 Full Load current Maximum Ampere rating of the Motor Circuit Breaker  2.5 Full Load current That is for 1Ø and 3Ø motors with Full Load current less than 30 amperes Maximum Ampere rating of the Motor Circuit Breaker  2 Full Load current That is f or 3Ø motors with Full Load current more than 30 amperes Note: Feeder conductors / branch circuit conductors for lighting, small appliance and similar loads shall be loaded not more than 80 of their ampacities. 1 = 1.25 0.8 … … … … … … … … … … … … … … … … … … … … … … . … … … … … … … … … … . . . … … … . .. … … … . .

… … … … … … … … … … … … … … … … … … … … … … . … … … … … … … … … … . . . … … … . .. … … … . .

… … … … … … … … … … … … … … … … … … … … … … . … … … … … … … … … … . . . … … … . .. … … … . .

 

… … … … … … … … … … … . . .… … … … … . .

… … … … … … … … … … … . . . … … … … … . .

… … … … … … … … … … … . . . … … … … … . .

… … … … … … … … … … … . . . … … … … … … … … … . . … … … . . .… . . … …

… … … … … … … … … … … … … … … … … … … … … … . .… … … … … … .

… … … … … … … … … . .. … … … … … … … … … … … … … … … … … … … … … .… … … … … … … … … … …

 

 

… … … … … . .. … … … . .… … … . . … … … … … … … … … … … … … … … …

… … … … … … … … … … … … … … … … … … … … … … … … … … … … . .

LOAD SCHEDULE FOR PANEL BOARD LP 

Ckt. No.

LOAD DESCRIPTION

Volts

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Duplex Convenient Outlet Duplex Convenient Outlet Duplex Convenient Outlet Duplex Convenient Outlet Duplex Convenient Outlet Duplex Convenient Outlet Freezer (5 1/4 HP each) Freezer (5 1/4 HP each) Fluorescent Lamps Fluorescent Lamps Freezer (5 1/4 HP each) Freezer (5 1/4 HP each) Fluorescent Lamps Fluorescent Lamps Fluorescent Lamp 24 I.L. Fluorescent Lamp 32 I.L. 2 Fluorescent Lamp Spare Spare Spare

230 230 230 230 230 230 230 230 230 230 230 230 230 230 230 230 230 230 230 230

Ckt. No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Size of Homerun 2

Wire (mm ) 2 - 3.5 TW 2 - 3.5 TW 2 - 3.5 TW 2 - 3.5 TW 2 - 3.5 TW 2 - 3.5 TW 2 - 3.5 TW 2 - 3.5 TW 2 - 3.5 TW 2 - 3.5 TW 2 - 3.5 TW 2 - 3.5 TW 2 - 3.5 TW 2 - 3.5 TW 2 - 3.5 TW 2 - 3.5 TW 2 - 3.5 TW 2 - 3.5 TW 2 - 3.5 TW 2 - 3.5 TW

Lighting Outlet

Convenience Outlet

Switch

8 8 7 6 6 6 5 5 18 14

2 6 5 5

12 11 18 18 11

2 7 8 6 5

Maximum Ampacity of the Feeder Current = 1.25 (1.73)(largest phase current) = 1.25(1.73)(53.37) = 115.546 Amperes

Conduit (mm) 15Ø RSC 15Ø RSC 15Ø RSC 15Ø RSC 15Ø RSC 15Ø RSC 15Ø RSC 15Ø RSC 15Ø RSC 15Ø RSC 15Ø RSC 15Ø RSC 15Ø RSC 15Ø RSC 15Ø RSC 15Ø RSC 15Ø RSC 15Ø RSC 15Ø RSC 15Ø RSC

VA / Circuit                                        

1,440.00 1,440.00 1,260.00 1,080.00 1,080.00 1,080.00 3,335.00 3,335.00 936.00 728.00 3,335.00 3,335.00 624.00 624.00 1,448.00 1,764.00 1,144.00 2,300.00 2,300.00 2,300.00

Ampere Load 6.26 6.26 5.48 4.70 4.70 4.70 14.50 14.50 4.07 3.16 14.50 14.50 2.71 2.71 6.30 7.67 4.97 10.00 10.00 10.00 Total

Load Per Phase  AB 6.26 6.26

CA

Circuit Breaker  BC

5.48 4.70 4.70 4.70 14.50 14.50 4.07 3.16 14.5 14.5 2.71 2.71 6.30 7.67 4.97 10.00

46.94

10 10 51.38

AT 20 20 20 20 20 20 30 30 20 20 30 30 20 20 20 20 20 20 20 20

AP 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50

Pole 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2

53.37

therefore use: - 3 - 38mm2 THW (Ampacity = 125A) - 32 mmØ RSCP - 125AT / 200AF, 3P, 250V

LOAD SCHEDULE FOR PANEL BOARD PPA

Ckt. No.

LOAD DESCRIPTION

Volts

Phase

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

 ACU, 1HP Silent Cutter, 5HP  ACU, 1.5 Hp  ACU, 1.5 Hp  ACU, 2 Hp  ACU, 2 Hp Stuffing Machine, 7.5 Hp Grinder, 10 Hp Chiller compressor, 3 Hp Seamer, 1.5 Hp Mince Master, 13 Kw Vacuum sealer, 1/2 Hp Bandsaw, 1 Hp Linker & Air comp, 2 - 1/3 Hp Plastic sealer, 2 - 300w Silent Cutter, 5HP Spare Spare

230 230 230 230 230 230 230 230 230 230 230 230 230 230 230 230 230 230

1 1 1 1 1 1 3 3 3 3 3 3 1 1 1 1 1 1

VA per circuit 1,840.00 6,440.00 2,300.00 2,300.00 2,760.00 2,760.00 8,764.00 10,755.00 3,585.00 1,992.00 19,121.00 7,970.00 1,840.00 1,656.00 600.00 6,400.00 2,300.00 2,300.00

Load Per Phase

 Ampere per circuit

 AB 8 28

8 28 10 10 12 12 22 27 9 5 48 2 8 7.2 2.6 28 10 10

CA

BC

Circuit Breaker  3Ø

10 10 12 12 22 27 9 5 48 2 8 7.2 2.6 28 10 10

Total

51.2

50.6

 Ampere per circuit

 AB

CA

44

AT 20 70 30 30 30 30 50 70 20 20 100 20 20 20 20 70 30 30

AP 50 50 50 50 50 50 50 100 50 50 100 50 50 50 50 100 50 50

Size of Homerun Pole 2 2 2 2 2 2 3 3 3 3 3 3 2 2 2 2 2 2

2 Wire (mm ) Conduit (mm) 2 - 3.5 TW 15Ø RSC 2 - 8.0 TW 20Ø RSC 2 - 3.5 TW 15Ø RSC 2 - 3.5 TW 15Ø RSC 2 - 3.5 TW 15Ø RSC 2 - 3.5 TW 15Ø RSC 3 - 5.5 TW 15Ø RSC 3 - 8.0 TW 20Ø RSC 3 - 3.5 TW 15Ø RSC 3 - 3.5 TW 15Ø RSC 3 - 22 TW 25Ø RSC 3 - 3.5 TW 15Ø RSC 2 - 3.5 TW 15Ø RSC 2 - 3.5 TW 15Ø RSC 2 - 3.5 TW 15Ø RSC 2 - 8.0 TW 20Ø RSC 2 - 3.5 TW 15Ø RSC 2 - 3.5 TW 15Ø RSC

Pole 3 3 2 2 2 2 2 2 2 2 2 2 2 2

2 Wire (mm ) Conduit (mm) 3 - 3.5 TW 15Ø RSCP 3 - 3.5 TW 15Ø RSCP 2 - 8.0 TW 20Ø RSCP 2 - 5.5 TW 15Ø RSCP 2 - 3.5 TW 15Ø RSCP 2 - 5.5 TW 15Ø RSCP 2 - 5.5 TW 15Ø RSCP 2 - 5.5 TW 15Ø RSCP 2 - 3.5 TW 15Ø RSCP 2 - 3.5 TW 15Ø RSCP 2 - 8.0 TW 20Ø RSCP 2 - 3.5 TW 15Ø RSCP 2 - 3.5 TW 15Ø RSCP 2 - 3.5 TW 15Ø RSCP

113

Minimum Ampacity of the Motor Feeder Conductor  = I3Ø + 1.73(largest phase current) + 0.25 (largest full load current) = 113 + 1.73(51.2) + 0.25(48) = 213.68 Amperes Wire: Use  3- 100mm2 THW Conduit: Use 50mmØ RSCP Maximum ampere rating of the Feeder Circuit Breaker: = Rating of largest C.B. + Full Load line current of the other motors = 100 + (113 - 48) + 1.73(51.2) = 253.68 Amperes Use: 250 AT / 400AF LOAD SCHEDULE FOR PANEL BOARD PPB

Ckt. No.

LOAD DESCRIPTION

Volts

Phase

1 2 3 4 5 6 7 8 9 10 11 12 13 14

Seamer, 1/2 Hp Seamer, 1/2 Hp Mixer, 5 Hp Silent Cutter, 3 Hp Freezer, 2 - 1/3 Hp Silent cutter, 3 Hp Grinder, 3 Hp Grinder, 3 Hp Slicer, 2 - 1/3 Hp Slicer, 2 - 1/3 Hp Mixer, 5 Hp Plastic Sealer, 2 - 300w Spare Spare

230 230 230 230 230 230 230 230 230 230 230 230 230 230

3 3 1 1 1 1 1 1 1 1 1 1 1 1

VA per circuit 1,992.00 1,992.00 6,440.00 3,910.00 1,656.00 3,910.00 3,910.00 3,910.00 1,656.00 1,656.00 6,440.00 600.00 2,300.00 2,300.00

5 5 28 17 7.2 17 17 17 7.2 7.2 28 26 10 10 Total

Load Per Phase BC

Circuit Breaker   3Ø 5 5

28 17 7.2 17 17 17 7.2 7.2 28 26.00

 

59.40

 

78.20

10 10.00   54.00

10.00

AT 20 20 70 50 20 50 50 50 20 20 70 20 20 20

AP 50 50 100 50 50 50 50 50 50 50 100 50 50 50

Size of Homerun

MAFCC = 10 + 1.73(59.4-28) + 1.25(1.73)(28) = 126.73 Amperes Use : 3 - 50mm2 THW, 145A / 126.73 A in 40mmØ RSCP MROFCOPD = 70 + 1.73(31.4) + 10 Use : 150 AT / 200AF, 3P, 250V C.B.

= =

10+1.73*(78.2)+0.25*28*1.73 157.396

= =

(10+1.73*78.20)*1.25+0.25*28*1.73 193.7175

SUMMARY OF LOADS MDP 

LOAD DESCRIPTION

Volts

Phase

Total VA

LP PPA PPB Meat Cutter  Meat Cutter 

230 230 230 230 230

3 3 3 3 3

 25,068.00  80,850.00  42,672.00  37,647.00  37,647.00

Load Per Phase  AB 46.94 51.20 59.40

     

Total

157.54

     

BC 51.38 50.60 54.80

     

156.78

CA 53.37 44.00 54.00

151.37

3Ø        

113.00 10.00 118.13 118.13

uit Breaker Rating AT 125 250 150 250 250

AF 200 400 200 400 400

Type and Size of wire

Pole 3 3 3 3 3

2

3 - 38mm  THW 2 3 - 100mm  THW 2 3 - 50mm  THW 2 3 - 60mm  THW 2 3 - 60mm  THW

Size of Conduit 30mmØ RSCP 50mmØ RSCP 40mmØ RSCP 40mmØ RSCP 40mmØ RSCP

359.26

Note : The Efficiency of the Meat Cutter is assumed to be 85% and the power factor is assumed to be 80% 32 (1000) Meat Cutter I FL = = 118.13 1.73 (230)(0.85)(0.8) MAFCC = 1.25(118.13) =147.66 Amperes Use : 3 - 60mm2 THW, (160A / 147.66A) in 40mmØ RSCP MROFCOPD = 2(118.12) = 236.26 Amperes Use : 250AT / 400AF, 3P 250V motor branch circuit breaker  MDP: Minimum Ampere = 1.73(157.54) + (359.26 - 118.13) + 1.25(118.13) = 662 Amperes Use : 2 sets of 3 - 250mm2 THW (750 / 622A), in 80mmØ RSCP Maximum ROFCOPD = 250 + (359.26 - 118.13) + 1.73(157.54) = 763.98 Amperes Use : = 800AT / 800Af, 3P 250V Main Feeder C.B. COMPUTATION 

PPA CKT. NO

 AMPERE TRIP, AT

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

2.5 x 8 = 20 A 2.5 x 28 = 70 A 2.5 x 10 = 25 A 2.5 x 10 = 25 A 2.5 x 12 = 30 A 2.5 x 12 = 30 A 2.5 x 22 = 55 A 2.5 x 27 = 67.5 A 2.5 x 9 = 22.5 A 2.5 x 5 = 12.5 A 2.5 x 48 = 96 A 2.5 x 2 = 5 A 2.5 x 8 = 20 A 2.5 x 7.2 = 18 A 2.5 x 2.6 = 6.5 A 2.5 x 28 = 70 A 2.5 x 10 = 25 A 2.5 x 10 = 25 A

NON ADJUSTABLE TRIP C.B

 A.F

 AMPERE TRIP (AT)

20 70 30 30 30 30 50 70 20 20 100 20 20 20 20 70 30 30

50 100 50 50 50 50 50 100 50 50 100 50 50 50 50 100 50 50

1.25 x 8 = 10 A 1.25 x 28 = 35 A 1.25 x 10 = 12.5 A 1.25 x 10 = 12.5 A 1.25 x 12 = 15 A 1.25 x 12 = 15 A 1.25 x 22 = 27.5 A 1.25 x 27 = 33.75 A 1.25 x 9 = 11.25 A 1.25 x 5 = 6.25 A 1.25 x 48 = 60 A 1.25 x 2 = 2.5 A 1.25 x 8 = 10 A 1.25 x 7.2 = 9 A 1.25 x 2.6 = 3.25 A 1.25 x 28 = 35 A 1.25 x 10 = 12.5 A 1.25 x 10 = 12.5 A

LP DETAILS  A

B

C

Wire Size (mm2) 2 - 3.5 TW 2 - 8 TW 2 - 3.5 TW 2 - 3.5 TW 2 - 3.5 TW 2 - 3.5 TW 3 - 5.5 TW 3 - 8.0 TW 3 - 3.5 TW 3 - 3.5 TW 3 - 22 TW 3 - 3.5 TW 2 - 3.5 TW 2 - 3.5 TW 2 - 3.5 TW 2 - 3.5 TW 2 - 3.5 TW 2 - 3.5 TW PPA DETAILS B C  A

Conduit (mm) Ø RSCP 15 20 15 15 15 15 15 20 15 15 25 15 15 15 15 15 15 15

Minimum Ampacity of the Feeder Conductor: = 1.25(1.73)(largest phase current) = 1.25(1.73)(53.37) = 115.546 Ampere Wire Use : 3 - 38mm2 THW (Ampacity = 125 A) Conduit Use : 32 mmØ RSCP Feeder Circuit Breaker for LP, use: 125 AT / 200AF, 3P, 250V Computation for AT 1.) 2.5 x 6.26 = 15.65………… 20 3.) 2.5 x 5.43 = 13 .7…………… 20 12.) 2.5 x 14.5 = 36.25………… 36.25 Note: Maximum no. of branch circuit in one panel board is 21.

 A

PPB DETAILS B C

250AT / 400 AF, 3P 250V 125 AT / 200 AF

1

2

1

2

3

4

3

4

5

6

5

6

7

8

7

8

9

10

11

12

13

14

15

16

17

18

9

19

10

11

12

13

14

15

16

17

18

1

2

3

4

5

6

7

8

9

10

11

12

13

14

20

COMPUTATION 

PPB

COMPUTATION

 AT

 AF

1 2 3 4 5 6 7 8 9 10 11 12 13 14

2.5 (5) = 12.5 2.5 (5) = 12.5 2.5 (28) = 70 2.5 (17) = 42.5 2.5 (7.2) = 18 2.5 (17) = 42.5 2.5 (17) = 42.5 2.5 (17) = 42.5 2.5 (7.2) = 18 2.5 (7.2) = 18 2.5 (28) = 70 2.5 (2.60 = 6.5 Spare = 10 Spare = 10

20 20 70 50 20 50 50 50 20 20 70 20 20 20

50 50 100 50 50 50 50 50 50 50 100 50 50 50

WIRE SIZE mm 1.25(5) = 6.25 1.25(5) = 6.25 1.25(28) = 35 1.25(17) = 21.25 1.25(7.2) = 9 1.25(17) = 21.25 1.25(17) = 21.25 1.25(17) = 21.25 1.25(7.2) = 9 1.25(7.2) = 9 1.25(28) = 35 1.25(2.6) = 3.25 1.25(10) = 12.5 1.25(10) = 12.5

2

2 - 3.5 TW 2 - 3.5 TW 2 - 8.0 TW 2 - 5.5 TW 2 - 3.5 TW 2 - 5.5 TW 2 - 5.5 TW 2 - 5.5 TW 2 - 3.5 TW 2 - 3.5 TW 2 - 8.0 TW 2 - 3.5 TW 2 - 3.5 TW 2 - 3.5 TW

MAFCC = 10 + 1.73(59.4 - 28) + 1.25(1.73)(28) = 126.73 Amperes Use : 3 - 50mm2 THW, 145 / 126.73A Conduit : 40 mmØ RSCP MROFCOPD = 70 + 1.73(59.4 - 28) + 10 = 134.39 Amperes Use : 150AT / 200AF, 3P 250V FCB

L RISER DIAGRAM

To 230V, 3Ø supply

2

2 sets of 3 - 250 mm  THW in 80mmØ RSCP for each set 2

3 - 60mm  40mmØ RSCP

M

250AT / 400 AF LP 250 AT / 400 AF 3P, 250V

PPA

PPB

MDP

125 AT / 200AF

150 AT / 200 AF, 3P, 250V

ELECTRICAL PLAN : Specification written on an Electrical Plan should indicate: 1. That the design is done in accordance with the Philippine Electrical Code (PEC) and all electrical works shall comply with the provisions of all authorities having jurisdiction on the use of electrical power. 2. The nature of the service including voltage, phase and frequency. 3. The type of approved wiring to be used in installing service entrance, feeders, subfeeders , branch circuit conductors, remote control system, fire protection, signal and communication system. 4. All other aspects and details that the designer and the owner would want to be done in the actual construction of the project. Example: 

1. Work hereunder shall comply with the latest edition of the Philippine Electrical Code, The National Building Code, Municipal or City ordinances, office of the Municipal or City Electrician, National Power Corporation and Meralco. 2. Type of service shall be 220/110V, 1 phase (single phase) , 3-wire system, 60 Hz and there shall be only one service drop to the building. 3. Method of wiring shall be in RMC for both exposed and embedded work with proper fittings and supports. In cases where concealed conduits wiring is impracticable to use metal molding may be applied. 4. All wall outlets shall be installed at the following heights above finished floor level, unless otherwise noted: a. Wall Switches 1.20 meters b. Convenience Outlet 0.30 meters c. Convenience outlet above counter 0.15 meters d. Night Light outlet 0.30 meters e. Air-conditioning outlet (to be determine by Engr. Or Arch-in-charge) f. Electrical clock outlet 2.75 meters g. Electrical interval timer outlet 2.50 meters h. Telephone Outlet 0.30 meters I. Vibrating bell outlet 0.30 meters  j. Call bell outlet 0.30 meters k. Fire alarm station outlet 1.50 meters l. Fire alarm bell outlet 2.75 meters m. Master Timer programmer outlet 1.00 meters n. Master timer programmer outlet 1.00 meters o. Bundy clock outlet 1.00 meters p. Chime bell outlet 2.50 meters q. Panelboard and safety switches 1.35 meters r. Service kilowatt-hour meter 1.60 meters 5. All materials and equipment shall be new and approved type for both location and purpose intended. 2 2 6. All lightning and convenience receptacle circuit shall be wired with not less than 2mm and 3.5mm copper respectively unless otherwise indicated on the plan. 7. Lightning and power panelboard shall be circuit breaker type, surfaced or flushed mounted or as indicated in plan. Door shall be provided with locked and grilled key. A line circuit directory card and holder shall be provided on face of door. 8. Whenever required and necessary, Pull boxes and junction boxes of proper sizes shall be installed at convenient and inconspicuous locations although such boxes are not shown on the plans nor mentioned in the specifications. 9. All outdoor installations shall be weatherproof type. 10. All electrical works shall be done under the direct and immediate supervision of a duly lic ensed Electrical Engineer. LEGEND / SYMBOLS: The Legend or Symbols shall show configurations and figures of devices and equipment used. Standard Electrical Symbols can be obtained from page 732 appendix of Philippine Electrical Code (PEC). LOCATION PLAN: Location or site plan. W ith proposed structures and owners land, drawn to appropriate metric scale shall show: 1. Bordering areas showing public or well-drawn streets. 2. Location of service drop, service equipment and nearest pole of the utility company furnishing electrical energy. 3.Clearance of the path or run of service drops and service entrance sites to adjacent existing or proposed structures. RISER DIAGRAM: Consist of the schematic diagram of service entrance, feeders and branch circuits. This indicates: 1. The number of branch circuits, the size of conductors, size of conduit and protection for each branch circuits. 2. The sizes of feeders, its conduit and feeders protection. 3. The type of service, size of service entrance conductor, conduit and main protection device. TITLE BLOCK: The Title Block or Nameplate of plans and drawings shall be a standard strip of 40mm high at the bottom of each sheet of the plan. Example: 

2.

1

Proposed Electrical Plan of a Single Family Dwelling Phase II, Palmera Subd., Q.C.

3 Ground and Second Floor Electrical Plan, Riser Diagram, Location Plan, Legend.

5

9 7

1. Constructors Logo : Name and address of constructors company 2. Name of Project. 3. Sheet Contents. 4. Name and Address of owner. Example: Felimon C. Sangcap 60 Dulong Ilog, Candaba  

Pampanga

5. Drawn By 6. Checked By 7. Designed By 8. Scale 9. Name of Professional Electrical Engineer  10. Registration No. 11. PTR No. 12. Res Cert No. 13. TIN No. 14 Sheet No. ELECTRICAL LIGHTNING AND POWER LAYOUT: Electrical layout for each floor of the building shall indicate the location of: 1. Location of lightning outlets. 2. Location of convenience outlet. 3. Location of switches with their corresponding symbols. 4. Location of special purposed outlets or fixed appliance with their corresponding symbols. 5. Location of outlets for Air Conditioning Units (ACU). 6. Location of Service Equipment and / or disconnecting means. 7. Location of Service kilowatt-hour meter. SCHEDULE OF LOADS AND COMPUTATION: Schedule of loads in tabulated form shall indicate: 1. Motor Loads: a. Motor as numbered or identified in power layout. b. Type of motor  c. HP / KW / KVA Rating d. Voltage Rating e. Full load current rating g. number of phases

6

4 8

10 11 12 13

14

2. Lightning Loads: a. Panel as numbered in the Riser Diagram b. Circuit designation number  c. number of lightning outlets in each circuit d. Number of switches in each circuit e. Number of convenience outlets f. Voltage of circuit g. Fuse rating or trip rating of circuit protective device 3. Other Loads: a. Designation number on plan b. description of load c. Classification of service duty d. Rating in kilovolt ampere (KVA) or kilowatt (KW) e. Phase loading indicating full load line current f. Voltage rating

ELECTRICAL ESTIMATION GUIDE: 1. Prepare paper, pencils, scale and rulers. Mark papers indicating the panel no., ckt. No and the location of the ckt. Run. 2. Study plans, drawings and specifications: 2.1 Coordinate with Civil, Mechanical and Architectural Estimators about the following: 2.1.1 height between floors 2.1.2 drop ceiling and ceiling supports 2.1.3 height between finished floors and ceilings 2.1.4 major beams and columns thru which conductors may not pass 2.1.5 other architectural / civil / mechanical / drawings indicating positions of lights, special outlets or aircon unit equipment. 2.2 Check and make a physical count of the following: 2.2.1 lighting fixture - no. of each type of fixture 2.2.2 convenience outlet duplex 2.2.3 special outlets 2.2.4 panel boards - make a complete description of each panel board. The description includes: a. main breaker ratings or lugs only b. no. of branches per ampere trip c. KAIC ratings 2.2.5 Other electrical equipment to be supplied by contractor  2.3 Study carefully the circuit runs and the riser diagram together with the schedule load. 3. Determine the approximate length of wire and conduct per circuit. 3.1 For the conduit - each ckt measure the length fromthe last outlet to the panel using the scale. The trace of the route must be followed as per drawings. 3.2 For the wire- measure the length between outlet and the length shall be multiplied by the number of wires. The sum of the products (length x the number of wires) shall be approximate length of the wire. 3.3 Sum up the total length of conduit per size and divide by 150 to get the no. of rolls. Round off and add 10%. 3.4 Sum up the total length of wire for each size and divide by 150 to get the no. of rolls. Round off and add 10%. 3.5 Set aside the papers and data temporarily. 4. Determine the approximate length of wire and conductor for the panel homerun to the main panel or main distribution panel. 4.1 Conduits - measure the length of the run. Check the shortest possible route and avoid obstructions. The total length divide by 3 and add 5%. 4.2 Conduits not embedded in concrete shall be firmly supported and fastened in place every 3.0m and within 0.91m of each outlet box or  cabinet. 4.3 Conduits shall have no more than four (4) 90 degrees bends in any run. When it becomes necessary to have more than 4 90 degrees bends, an intermediate pull box shall be installed to facilitate pulling of wires and cables. 4.4 Wire - multiply the length of conductor by the following constants: a. 2 for two wire single phase b. 3 for two wire single phase with neutral c. 3 for three wire 3-phase d. 4 for three phase, four wires 5. Boxes 5.1 Octagonal Boxes - provide one box for each lighting fixture. 5.2 Utility box 4" x 2" - provide one box for each switch; duplex outlet or special outlet (small). 5.3 Square box 4" - provide one box if the conduits terminating exceed 4 conduits or special big outlet. 5.4 Square box 4 11/16" - provide one box for 1 inch diameter conduits or for special purpose outlets. Also provide one box for multiple (6 or more) terminations. 5.5 Pull Boxes - provide one box for every 18 meters per conduits length depending upon the length of run. Other pull boxes may be designated by plans. Check with the designer / consultant about sizes. 6. Fittings 6.1 For PVC pipes 6.1.1 couplings - provide 1 coupling for every length plus 1 coupling for every termination. 6.1.2 elbows - provide 1 - 90 degrees elbow for every turn f or sizes of 32mm (1 1/44) and above. 6.1.3 cement - provide one can for every 10 lengths of conduit. 6.1.4 end bells - provide 1 for every terminations. 6.2 For RSC conduits 6.2.1 couplings - provide 1 additional coupling for every 5 lengths. 6.2.2.elbows - provide one 90 degrees elbow for every 90 degrees turn for sizes of 25mm (1") diameter above. 6.2.3 locknut and bushings - provide one pair for every termination. 6.3 For Electrical Metallic Tubing (EMT) 6.3.1 Couplings - 1 set screw coupling for every length. 6.3.2 Elbows - use on-site bended EMT. 6.3.3 Adapters with locknuts and bushing - for every termination is an adapter and 1 pair of locknut and bushing. 6.4 Straps - two (2) straps for every length of conduit. In sizes of 25 mm (1") diameter and above use clamps or screwed on clamps, especially for RSC or EMT conduits. 6.5.1 Wire trays / cable trays - check with the drawings and the consultant / designer. 6.5.2 Cable troughs / duets - check with drawings especially that the drawing may have specific sizes. 6.5 Every cable riser splicing shall be provided with pullbox and cable support (for exposed conduit provide clamps every 1.5m). 6.6 For every straight cable riser shall be provided with pullbox and cable support every four floors. 6.7 Pullbox shall be provided with cable support.

Conduit Riser  (refer to riser for size)

Pull Box 

Pullbox Ga#16 (size as required)

Hard rubber insulation  Anchor Bolt

Unistrut Channel Wires and cables (as per load schedule)

Cable Stopper (Typical) Pullbox Cover

Provision for padlocking

Junction Box 

To Lighting Fixture or Box

Flexible Metallic Conduit Strap

IMC or Flexible Metallic Conduit

Double Locknut and Bushing

Wire Nut Junction / Utility / Square or Pullbox 7. Other considerations. 7.1 For lighting fixtures - add 1 meter (multiply by number of wires per conduit) of wire for every termination or lighting fixture. Slab

Support Octagonal Box

Pipe** ** PVC if embedded, IMC or EMT if exposed Floor Elevation

Drop Height Ceiling Height = Ceiling Height + = As per Architect Specification consideration Flexible Metallic Conduit Additional 1 meter consideration

Lighting Fixture Mounting - As per Architecture Specification Height  Additional 1 meter   consideration per wire

Floor 

7.2 For convenience outlets a. Add 0.8 meter for every c.o. to the length of pipe and 1 meter of wire for every termination. b. Add 0.4 meter above the height of counters if the c.o. is above the counter in addition to the height of the counter. Also 1 meter of wire for every termination. Conven ience Outlet

 Add 1 meter consideration per wire Utility Box**

2

** For wires up to 5mm  only. Use Square Box if more than 5

 Add 0.8 meters  consideration Mounting = 0.3 meters (as per PEC) Height unless otherwise specified Floor 

Elbow Conven ience Outlet (Coun tertop) 

 Add 1 meter consideration per wire Utility Box** counter

consideration  Add 0.4 meters consideration

Mounting = 0.15 meters (as per PEC) Height unless otherwise specified

 Add 0.8 meters  consideration Countertop = As per Architectural Height Specification Floor 

floor 

Elbow Switches 

Slab

Ceiling 

Pipe** ** PVC if embedded, IMC or EMT if exposed Floor Elevation

Support Octagonal Box

Splice Drop = Floor Elevation minus Mounting Height Height

Utility Box Add 0.8 meter consideration Mounting = 1.3 meters (as per PEC) Height unless otherwise specified  Additional 1 meter   consideration per wire

Floor 

7.3 For homeruns terminating at panel boards, add 3 meters of wire (multiply by the nu mber of wires) for every circuit. Slab

Pipe** ** PVC if embedded, IMC or  EMT if exposed

Support Octagonal Box

Ceiling  Drop = Floor Elevation minus Mounting Height Height

Add 0.8 meter consideration Utility Box

Floor  Elevation

Mounting Height 2 = 0.45 m minimum distance from floor

Mounting = 1.8 meters from the center (as per PEC) Height unless otherwise specified Additional 3 meter  consideration per wire

Floor 

7.4 Provide an empty conduit for every spare circuit per panel. 7.5 Normally the electronic and communication circuits will be in separate sheets and have an ECE estimate. 7.6 Provide connector for every termination #6 up. 8. Summarize the list of materials as follows: 8.1 Conduits - total of each size / type 8.2 Fittings - total of each type size 8.3 Boxes - total for each type / size 8.4 Panels - per panel and lowest canvassed price. 8.5 Wires - total length for each wire size 8.6 Connectors - (solder less type) total termination of each size for wire size #6 AWG and above. 8.7 Tape - 1 roll PVC tape for 100 meters of wire plus 1 roll of rubber tape for every 200 meters of wire. 9. Costing: 9.1 get the unit cost for every item and deduct all discounts. 9.2 From the total cost add a 5% to 10% mark-up. 9.3 For all other materials like ducts, panels, transfer switches, safety switches, starters etc. - get the price from the fabricator net (less discounts) and add 5% mark-up. 10. Preparation of Bid or Asking Price 10.1 Materials Cost Conduits Fitting Boxes Wires and Wiring Devices Lighting Fixtures Safety Devices Service Entrance and Mains Others 10.2 Labor Cost (subject for interpretation) 10.2.1 If Materials are imported a. Labor Cost is 20% of sub-total A b. Supervision is 3% of Sub-total A c. Mark-up is 1.25% of Sub-total A 10.2.2 If the conduits and most materials are locally available a. Labor cost is 25% to 30% of sub-total A b. Supervision cost is 4% to 5% of subtotal A c. Mark-up cost is 2% of subtotal A 10.3 Contingencies - an allowance of 5% to 7% of the total cost of materials and labor. 10.4 Overhead - this includes the cost of transportation, office staff, tools and equipment depreciation, paper and office supplies, representation and insurance cost of money. '- normally 7% to 10% of the cost of materials is the cost of overhead. 10.5 Permits - shows the plans to the municipal electrical engineer or his assistant and request for an estimate, Add 5% to cover the exigencies. 10.6 a. the sum of the cost as computed is sections 10.1 to 10.5 is multiplied by 0.03 to get the contractors tax. b. Add the contractors tax to the sum of sections 10.1 to 10.5 and round-off. This will be your bid price. 11. Concrete encasement / Pipe Chase / Sleeve Sealant Details To compute for concrete encasement (same with block-outs) use the following: 11.1 Determine the size of the conduit to be embedded 11.2 Determine the length of the conduit to be embedded. 11.3 Obtain the volume of concrete to be used. Use the following spacing: 0.05 to 0.075m = Distance between the edge of the conduit to the edge of the concrete 0.05m = Distance between 2 conduit  A of Blockout = A of Box - (A of conduit x No. of conduits) V of Concrete encasement = Length of Pipe x A of Blockout

0.05m

Conduit size

Conduit size 0.05m Telephone Wires and Cable (Typical) Concrete Slab

A

25 mm Silicon Sealant or Intumescent putty "Specseal" or "Hilti"

Finished Floor Level

Note: Use Metallic Pipe for all Pipe Sleeves

Wires and Cables (Typical)

Fiberglass or Mineral Wool insulation PLAN

Silicon Sealant or   Intumescent Putty "Specseal" or "Hilti"

SECTION A

Electrical Pipe Chase or large openings through concrete walls and slabs Pipes

Concrete Slab

B

IMC Pipe (Typical) Fire Rated Mortar "Specseal" or "Hilti"

Finished Floor Level

Fire Rated Mortar "Specseal" or "Hilti" installed to a minimum of 115mm depth PLAN

115mm (min)

Electrical Pipe Chase or   large opening through concrete walls and slabs

SECTION B

C Concrete Slab Fiberglass or Mineral wool insulation Small opening through concrete wall or slab IMC Pipe (Typical)

Intumescent putty or sealant "Specseal" or Hilti" Intumescent Putty or Sealant "Specseal" or "Hilti" SECTION C PLAN 3

11.4 Obtain cost (use PhP 4000 / m  to determine cost. Ask civil group for update on price. Price contains both material and labor cost).

WIRING SCHEDULE:

1 PHASE, 2W+G

ITEM NO. C.B. TRIP S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S13

15 20 30 40 50 60 70 90 100 125 150 175 200

SET 1 1 1 1 1 1 1 1 1 1 1 1 1

WIRING SCHEDULE:

15 20 30 40 50 60 70 90 100 125 150 175 200 225 250 300 350 400 500 600 800 1000 1200 1600 2000 2500

SIZE (mm2) LINE G 2 2 3.5 3.5 5.5 5.5 8 5.5 14 8 22 8 22 8 30 8 38 14 60 22 80 22 100 30 125 30

RACEWAY SIZE (mm) METAL PVC 15 20 15 20 15 20 25 25 25 32 40 40 40 40 40 40 50 50 50 63 50 63 50 75 65 75

SIZE (mm2) LINE G 2 2 3.5 3.5 5.5 5.5 8 5.5 14 8 22 8 22 8 30 8 38 14 60 22 80 22 100 30 125 30 150 30 200 30 250 30 100 30 125 30 200 30 125 30 200 30 200 30 125 30 200 30 200 30 200 30

RACEWAY SIZE (mm) METAL PVC 15 20 15 20 15 20 25 25 25 32 32 40 32 40 40 40 50 50 50 63 65 63 65 75 80 75 80 90 90 90 100 110 65 75 80 75 90 90 80 75 90 90 90 90 80 75 90 90 90 90 90 90

3 PHASE, 3W+G

ITEM NO. C.B. TRIP T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22 T23 T24 T25 T26

CONDUCTORS QUANTITY LINE G 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1

SET 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 3 3 4 6 6 8 10

CONDUCTORS QUANTITY LINE G 3 1 3 1 3 1 3 1 3 1 3 1 3 1 3 1 3 1 3 1 3 1 3 1 3 1 3 1 3 1 3 1 3 1 3 1 3 1 3 1 3 1 3 1 3 1 3 1 3 1 3 1

NEC Table 1 In Raceway

Size

Copper  o

In Free Air  Aluminum

o

o

Copper o

o

Alum o

AWG & MCM 75 C 90 C 75 C 90 C 75 C 90 C 14 20 25 30 35 12 25 30 20 25 35 40 10 35 40 30 35 50 55 8 50 55 40 45 70 80 6 65 75 50 60 95 105 4 85 95 65 75 125 140 3 100 110 75 85 145 165 2 115 130 90 100 170 190 1 130 150 100 115 195 220 1/0 150 170 120 135 230 260 2/0 175 195 135 150 265 300 3/0 200 225 155 175 310 350 4/0 230 260 180 205 360 405 250 255 290 205 230 405 455 500 380 430 310 350 620 700 NEC Table 2 Ampacity Correction Factor  Ambient o o 0.94 0.94 0.94 0.96 0.94 0.96 88-95 F (31-35 C) o o 0.88 0.91 0.88 0.91 0.88 0.91 97-104 F (36-40 C) NEC Table 3 Correction Factor for more than 3 Conductors in raceway or cable Conductors 4-6 7-9 10 - 24 25 - 42 43 or more Factor 0.80 0.70 0.70* 0.60* 0.50* * includes effect of a load diversity of 50% NEC Table 4 Dimensions and internal areas of Electrical Metallic Tubing (EMT) and Conduit Sizes (inches) Internal Ø Area m2 1 1/2 1.610 2.040 2 2.067 3.360 2 1/3 2.469 4.790 3 3.068 7.380 3 1/2 3.548 9.900 4 4.026 12.720 NEC Table 5 Dimensions of several rubber and thermoplastic-covered conductors Types RFH-2, RH, Types TFN, THHN, Types TF, THW, TW RHH THWN Size AWG Approx. Approx. Approx. Approx. Approx. Approx. 2 2 MCM Ø (inches) Area m Ø (inches) Area m Ø (inches) Area m2 14 0.2040 0.0327 0.1310 0.0135 0.1050 0.0087 12 0.2210 0.0384 0.1480 0.0172 0.1220 0.0117 10 0.2420 0.0460 0.1680 0.0222 0.1530 0.0184 8 0.3280 0.8450 0.2450 0.0471 0.2180 0.0373 6 0.3970 0.1238 0.3230 0.0819 0.2570 0.0519 4 0.4520 0.1605 0.3720 0.1087 0.3280 0.0845 3 0.4810 0.1817 0.4010 0.1263 0.3560 0.0995

o

75 C 30 40 55 75 100 115 135 155 180 210 240 280 315 485

0.94 0.88

2 1 1/0 2/0 3/0 4/0

0.5130 0.5880 0.6290 0.6750 0.7270 0.7850

0.2061 0.4330 0.1473 0.2715 0.5080 0.2027 0.3107 0.5490 0.2367 0.3578 0.5958 0.2781 0.4151 0.6470 0.3288 0.4840 0.7050 0.3904 dimensions of RHH and RHW

0.3880 0.4500 0.4910 0.5370 0.5880 0.6460

0.1182 0.1590 0.1893 0.2265 0.2715 0.3278

NEC Table 6 Maximum no. of conductors in conduits or tubing for most building wire types (TW, XHHW, RHW, RHH, T Conduit or Tubing (Inch) AWG & MCM 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 14 9 15 25 44 60 99 142 12 7 12 19 35 47 78 111 10 5 9 15 26 36 60 85 8 2 4 7 12 17 28 40 6 1 3 5 9 13 21 30 4 1 2 4 7 9 16 22 3 1 1 3 6 8 13 19 2 1 1 3 5 7 11 16 1 1 1 3 5 8 12 1/0 1 1 3 4 7 10 2/0 1 1 2 3 6 8 3/0 1 1 1 3 5 7 4/0 1 1 2 4 6 250 1 1 1 3 4 300 1 1 1 3 4 350 1 1 1 2 3 500 1 1 1 3

3

inum o

90 C 35 40 60 80 110 130 150 175 205 235 275 315 355 545

0.96 0.91

, THW)

3

3 1/2

4

171 131 62 47 35 29 25 18 15 13 11 9 7 6 5 5

176 84 63 47 39 33 25 21 17 14 12 10 8 7 6

108 81 60 51 43 32 27 22 18 15 12 11 9 8

CIRCUIT BREAKER RATING AMPERE AMPERE TRIP FRAME 15 50 20 50 30 50 40 50 50 50 60 100 70 100 100 100 125 225 150 225 175 225 200 225 225 225 250 400 300 400 350 400 400 400 500 600 600 600 700 800 800 800 1000 1000 1200 1200 1600 1600 2000 2000 2500 3000 3000 3000 4000 4000

EMT/IMC mm Ø 15 20 25 32 40 50 65 80 90 100

CONDUIT PVC mm Ø 20 25 32 40 50 63 75 90 110

in Ø ½" 3/4" 1" 1-¼" 1-½" 2" 2-½" 3" 3-½" 4