This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: B8 − 11 (Reapproved 2017)
Standard Specification for
Concentric-Lay-Str Concentric-L ay-Stranded anded Copper Conduc Conductors, tors, Hard, Medium-Hard, or Soft1 This standard is issued under the fixed designation B8; the number immediately following the designation indicates the year of original adoption adopt ion or, in the case of revis revision, ion, the year of last revision. A number in parentheses parentheses indicates indicates the year of last reapproval. reapproval. A super superscrip scriptt epsilon (´) indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Sco Scope pe
2. Referenc Referenced ed Documents 2.1 ASTM Standards: 2 B1 Specifica B1 Specification tion for HardHard-Drawn Drawn Copper Wir Wiree B2 Specification B2 Specification for Medium-Hard-Drawn Copper Wire B3 Specification B3 Specification for Soft or Annealed Copper Wire B33 Specification B33 Specification for Tin-Coated Soft or Annealed Copper Wire for Electrical Purposes B172 Specification B172 Specification for Rope-Lay-Stranded Copper Conductors Having Bunch-Stranded Members, for Electrical Conductors B173 Specification B173 Specification for Rope-Lay-Stranded Copper Conductors Having Concentric-Stranded Members, for Electrical Conductors B174 Specification for Bunch-Stranded Copper Conductors B174 for Electric Electrical al Condu Conductors ctors B189 Specification B189 Specification for Lead-Coated and Lead-Alloy-Coated Soft Copper Wire for Electrical Purposes B193 Test Metho Method d for Resistiv Resistivity ity of Electri Electrical cal Condu Conductor ctor Materials B246 Specifi Specification cation for Tin Tinned ned HardHard-Drawn Drawn and Mediu MediummHard-Drawn Copper Wire for Electrical Purposes B263 Test Met Method hod for Det Determ ermina ination tion of Cro Crossss-Sec Section tional al Area of Stranded Conductors B354 Terminology B354 Terminology Relating to Uninsulated Metallic Electrical Conductors B787/B787M Spe Specific cificatio ation n for 19 Wi Wire re Comb Combinat ination ion Unilay-Stranded Copper Conductors for Subsequent Insulation
1.1 This specifi specification cation covers bare concen concentric-la tric-lay-str y-stranded anded conductors made from round copper wires, either uncoated or coated with tin, lead, or lead alloy for general use for electrical purposes. purpo ses. These condu conductors ctors shall be const constructed ructed with a central core surrounded by one or more layers of helically laid wires. NOTE 1—This specification also permits conductors for use as covered or insulated electrical conductors. NOTE 2—Sealed conductors, that are intended to prevent longitudinal water propagation and are further covered/insulated, are also permitted within the guidelines of this specification.
1.2 For the pur purpos poses es of thi thiss spe specific cificatio ation, n, con conduc ductor torss are classified as follows (Explanatory Note (Explanatory Note 1 and and Note Note 2) 2 ): 1.2.1 Class AA— For For bare conductors usually used in overhead lines. 1.2.2 Class A— For For conductors to be covered with weatherresistant (weather-proof), slow-burning materials, and for bare conductors where greater flexibility than is afforded by Class AA is required. 1.2.3 Class B— For For conductors to be insulated with various materials such as rubber, paper, varnished cloth, and so forth, and for the conductors indicated under Class A where greater flexibility is required. 1.2.4 Class C and Class D— For For conductors where greater flexibility is required than is provided by Class B conductors. 1.3 The SI values for density density are regarded as the standard. standard. Forr all ot Fo othe herr pr prop oper ertie ties, s, th thee in inch ch-p -pou ound nd va valu lues es ar aree to be regarded as standard and the SI units may be approximate. 1.4 This int intern ernati ationa onall sta standa ndard rd was dev develo eloped ped in acc accor or-dance with internationally recognized principles on standardizatio iza tion n es esta tabl blis ishe hed d in th thee De Decis cisio ion n on Pr Prin inci cipl ples es fo forr th thee Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Order Ordering ing Information Information 3.1 Order Orderss for material under this specification specification shall include the following information: 3.1.1 Quant Quantity ity of each size and class, 3.1.2 Conductor size: circular-mil area or AWG (Section 6 (Section 6), ), 3.1.3 Class (see (see 1.2 1.2 a and nd Table Table 1), 1), 3.1.4 Temper (see 13.2 (see 13.2)),
1
This specification specification is under the juris jurisdictio diction n of ASTM Committee B01 on Electrical Conductors Electrical Conductors and is the direc directt respo responsibil nsibility ity of Subc Subcommitt ommittee ee B01.04 B01.04 on on Conductors of Copper and Copper Alloys. Curren Cur rentt edi editio tion n app approv roved ed Apr April il 1, 201 2017. 7. Pub Publis lished hed Apr April il 201 2017. 7. Ori Origin ginall ally y approv app roved ed in 191 1915. 5. Las Lastt pre previo vious us edi edition tion app approve roved d in 201 2011 1 as B8 – 11 11.. DOI DOI:: 10.1520/B0008-11R17.
2 For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at
[email protected]. For Annual Book of ASTM Standards volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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B8 − 11 (2017) TABLE 1 Construction Requirements of Concentric-Lay-Stranded Copper Conductors Area of Cross-Section, cmil
Size, American Wire Gage
Class AA Number of Wires
Diameter of Wires, mils
Class BA
Class A Number of Wires
Diameter of Wires, mils
Class C
Class D
Number of Diameter of Number of Diameter of Number of Diameter of Wires Wires, mils Wires Wires, mils Wires Wires, mils
* 5 0 0 0 00 0 ... .. . ... 1 69 1 7 2 .0 21 7 1 5 1 .8 2 71 1 3 5. 8 2 71 1 3 5 .8 4 5 00 00 0 . .. ... .. . 16 9 1 6 3 .2 21 7 1 4 4. 0 27 1 1 2 8 .9 27 1 12 8. 9 4 0 00 00 0 . .. ... .. . 16 9 1 5 3 .8 21 7 1 3 5. 8 27 1 1 2 1 .5 27 1 12 1. 5 3 5 00 00 0 . .. ... .. . 12 7 1 6 6 .0 16 9 1 4 3. 9 21 7 1 2 7 .0 27 1 113.6 * 3 0 0 0 00 0 ... .. . ... 1 27 1 5 3 .7 16 9 1 3 3 .2 2 17 117.6 2 71 1 0 5 .2 * 2 5 0 0 00 0 ... .. . ... 91 16 5. 7 1 27 1 4 0 .3 1 69 1 2 1 .6 2 17 1 0 7 .3 * 2 0 0 0 00 0 ... .. . ... 91 14 8. 2 1 27 1 2 5 .5 1 69 1 0 8 .8 2 17 9 6 .0 1 9 00 00 0 . .. ... .. . 91 14 4. 5 12 7 12 2. 3 1 69 1 0 6. 0 2 17 9 3 .6 1 8 00 00 0 . .. ... .. . 91 14 0. 6 12 7 119.1 1 69 1 0 3. 2 2 17 9 1 .1 * 1 7 5 0 00 0 ... .. . ... 91 13 8. 7 1 27 117.4 1 69 1 0 1 .8 2 17 8 9 .8 1 7 00 00 0 . .. ... .. . 91 13 6. 7 12 7 115.7 1 69 1 0 0. 3 2 17 8 8 .5 1 6 00 00 0 . .. ... .. . 91 13 2. 6 12 7 112.2 1 69 9 7 .3 21 7 8 5. 9 * 1 5 0 0 00 0 ... .. . ... 61 15 6. 8 91 1 2 8 .4 127 1 0 8 .7 169 9 4. 2 1 4 00 00 0 . .. ... .. . 61 15 1. 5 91 1 2 4 .0 1 27 1 0 5 .0 16 9 9 1. 0 1 3 00 00 0 . .. ... .. . 61 14 6. 0 91 119.5 1 27 1 0 1 .2 16 9 8 7. 7 * 1 2 5 0 00 0 ... .. . ... 61 14 3. 1 91 117.2 127 9 9 .2 16 9 8 6 .0 1 2 00 00 0 . .. ... .. . 61 14 0. 3 91 114.8 1 27 9 7. 2 16 9 8 4. 3 1 1 00 00 0 . .. ... .. . 61 13 4. 3 91 1 0 9 .9 1 27 9 3. 1 16 9 8 0. 7 * 1 0 0 0 00 0 ... 37 1 6 4 .4 61 1 2 8 .0 61 1 2 8 .0 91 1 0 4. 8 12 7 8 8 .7 90 0 00 0 ... 37 1 5 6 .0 61 1 2 1 .5 61 1 2 1 .5 91 9 9 .4 1 27 8 4 .2 * 80 0 0 00 ... 37 1 4 7. 0 61 114.5 61 114.5 91 9 3 .8 12 7 7 9. 4 * 75 0 0 00 ... 37 1 4 2. 4 61 110.9 61 110.9 91 9 0 .8 12 7 7 6. 8 * 70 0 0 00 ... 37 1 3 7. 5 61 1 0 7 .1 61 1 0 7. 1 91 8 7 .7 12 7 7 4. 2 65 0 00 0 ... 37 1 3 2 .5 61 1 0 3 .2 61 1 0 3 .2 91 8 4 .5 1 27 7 1 .5 * 60 0 0 00 ... 37 1 2 7. 3 37 1 2 7 .3 61 9 9. 2 91 8 1. 2 12 7 6 8 .7 55 0 00 0 ... 37 1 2 1 .9 37 1 2 1 .9 61 9 5. 0 91 7 7 .7 12 7 6 5. 8 * 50 0 0 00 ... 19 1 6 2. 2 37 116.2 37 116.2 61 9 0 .5 91 7 4 .1 45 0 00 0 ... 19 1 5 3 .9 37 110.3 37 110.3 61 8 5 .9 91 7 0. 3 * 40 0 0 00 ... 19 1 4 5. 1 19 1 4 5 .1 37 1 0 4. 0 61 8 1 .0 91 6 6 .3 * 35 0 0 00 ... 12 1 7 0. 8 19 1 3 5 .7 37 9 7. 3 61 7 5. 7 91 6 2 .0 * 30 0 0 00 ... 12 1 5 8. 1 19 1 2 5 .7 37 9 0. 0 61 7 0. 1 91 5 7 .4 * 25 0 0 00 ... 12 1 4 4. 3 19 114.7 37 8 2. 2 61 6 4. 0 91 5 2 .4 *211 600 0 00 0 7 1 7 3 .9 7 1 7 3 .9 19 1 0 5 .5 37 7 5 .6 61 5 8. 9 * 16 7 8 00 0 00 00 7 1 5 4 .8 7 1 5 4 .8 19 9 4 .0 37 6 7 .3 61 5 2 .4 * 13 3 1 00 00 7 1 3 7 .9 7 1 3 7 .9 19 8 3 .7 37 6 0 .0 61 4 6 .7 * 10 5 6 00 0 7 12 2. 8 7 1 2 2. 8 19 7 4 .5 37 5 3 .4 61 4 1. 6 * 83 690 1 3B 1 6 7 .0 7 1 0 9 .3 19 6 6. 4 37 4 7 .6 61 3 7 .0 * 66 360 2 3B 1 4 8 .7 7 9 7 .4 7 9 7 .4 19 5 9. 1 37 4 2. 4 * 52 620 3 3B 1 3 2 .5 7 8 6 .7 7 8 6 .7 19 5 2. 6 37 3 7. 7 * 41 740 4 3B 118.0 7 7 7 .2 7 7 7 .2 19 4 6. 9 37 3 3. 6 * 33 090 5 ... ... . .. .. . 7 6 8. 8 19 4 1 .7 37 2 9 .9 * 26 240 6 ... ... . .. .. . 7 6 1. 2 19 3 7 .2 37 2 6 .6 * 20 820 7 ... ... . .. .. . 7 5 4. 5 19 3 3 .1 37 2 3 .7 * 16 510 8 ... ... . .. .. . 7 4 8. 6 19 2 9 .5 37 2 1 .1 * 13 090 9 ... ... . .. .. . 7 4 3. 2 19 2 6 .2 37 1 8 .8 * 10 380 10 . .. . .. .. . ... 7 3 8 .5 19 2 3 .4 37 1 6. 7 * 6 530 12 ... ... . .. .. . 7 3 0. 5 19 1 8 .5 37 1 3 .3 *4 110 14 ... .. . . .. .. . 7 2 4. 2 19 1 4 .7 37 1 0 .5 * 2 580 16 ... ... . .. .. . 7 1 9. 2 19 11.7 . .. ... * 1 620 18 ... ... . .. .. . 7 1 5. 2 19 9. 2 . .. .. . * 1 020 20 ... ... . .. .. . 7 1 2. 1 19 7. 3 . .. .. . * 6 40 22 22 .. . . .. .. . .. . 7 9 .6 19 5 .8 . .. ... * 4 04 24 24 .. . . .. .. . .. . 7 7 .6 19 4 .6 . .. ... * The sizes of conductors that have been marked with an asterisk provide for one or more schedules of preferred series, and are commonly used in the industry. The sizes not marked are given simply as a matter of reference and it is suggested that their use be discouraged. A B
For unidirectional/unilay constructions the number of wires shown are minimum requirements. Although Althou gh Class AA conduc conductors tors having three strand strands s do not confor conform m to the constr construction uction requirements requirements of 1.1, 1.1 , they are listed in this table for convenience.
3.1.5 Whethe Whetherr coated or unco uncoated; ated; if coated, designate type of coating (see 13.1 and and 13.2 13.2), ),
3.1.11 3.1.1 1 Place of inspection inspection (see Section 14 Section 14). ).
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B8 − 11 (2017) TABLE 2 Minimum Distance Between Joints in the Completed Conductor Number of Wires in Conductor 3 7 12 19 2 0 to 3 6 3 7 to 6 0 61 and ov er A
Hard or Medium-Hard
S o ft
Class AA
Class A
Class B
Class C
Class D
All Classes
none permitted none permitted 5 0 ft 5 0 ft 5 0 ft
. .. 50 ft 5 0 ft 5 0 ft 50 f t 2 5 ft 5 ft
.. . 50 ft .. . 5 0 ft 5 0 ft 2 5 ft 5 ft
. .. . .. . .. 5 0 ft 5 0 ft 2 5 ft 5 ft
.. . .. . .. . .. . .. . 2 5 ft 5 ft
1 ft 1 ft 1 ft 1 ft 1 ft in a layerA 1 ft in a layerA 1 ft in a layerA
...
Except as indica indicated, ted, the limita limitations tions apply to closen closeness ess of joints throughout throughout the comple completed ted conductor. conductor.
brazes may be made in the finished individual wires composing the conductor, but shall not be closer together than prescribed in Table in Table 2. 2. 5. La Lay y 5.1 For Class AA conducto conductors rs composed of less than seven wires, the preferred lay is 11 times the outside diameter of the completed conductor, but shall be not less than 8 nor more than 14 times this diameter. 5.2 For Class AA conductor conductorss composed of seven wires or more, the preferred lay of a layer of wires is 13.5 times the outside diameter of that layer, but shall be not less than 10 nor more than 16 times this diameter. 5.3 For all other classes classes the lay of a layer of wires shall be not less than 8 nor more than 16 times the outside diameter of that layer, except that for conductors composed of 37 wires or more, this requirement shall apply only to the two outer layers. The lay of the layers other than the two outer layers shall be at the option of the manufacturer, unless otherwise agreed upon. 5.3.1 5.3 .1 For conducto conductors rs to be use used d in cov covere ered d or ins insula ulated ted wires or cables, the lay length shall be not less than 8 nor more than 16 times the outer diameter of the finished conductor. For conductors of 37 wires or more, this requirement shall apply to the wires in the outer two layers. The lay of the layers other than th an th thee tw two o ou oute terr la laye yers rs sh shal alll be at th thee op opti tion on of th thee manufacturer, unless otherwise agreed upon. 5.4 Oth Other er lay layss for special special pur purpos poses es sha shall ll be fur furnis nished hed by special agreement between the manufacturer and the purchaser (Explanatory Note (Explanatory Note 3) 3). 5.5 The direction direction of lay of the outer layer shall be left-hand, left-hand, and for conductors having a nominal cross-sectional area larger than No. 8 AWG, shall be reversed in successive layers, unless otherwise specified by the purchaser. 5.5.1 5.5 .1 For conducto conductors rs to be use used d in cov covere ered d or ins insula ulated ted wires or cables, the direction of lay of the outer layer shall be leftt ha lef hand nd an and d sh shall all be re reve vers rsed ed in su succe ccess ssiv ivee la laye yers rs,, unidirectional, or unilay, unless otherwise agreed upon.
conductor properly (strands in the outer layer having a larger diameter than those in the inner layers) the diameters shall be subject to a tolerance of 65 %, provided that the area of cross section after stranding is in accordance with Section 11 11.. 6.3 Where com compre presse ssed d str strand anding ing is req requir uired ed in ord order er to insulate insula te the con conduc ductor tor pro proper perly ly,, one or mor moree laye layers rs of any stra st rand nded ed co cond nduc ucto torr co cons nsist istin ing g of 7 wi wire ress or mo more re ma may y be slightly compressed, thereby reducing the outside diameter of the conductor to the nominal values shown in Table 3, 3, provided that the area of cross section after stranding is in accordance with Section 11 11.. 7. Physical and Electrical Tests Tests of Conductors Stranded of Soft Wires 7.1 Test estss for the elec electric trical al pro proper perties ties of wir wires es com compos posing ing conductors made from soft or annealed copper wire, bare or coated, shall be made before stranding. 7.2 Tests Tests for the phy physica sicall pro proper perties ties of sof softt or ann anneale ealed d copper copp er wi wire re,, ba bare re or co coate ated, d, ma may y be ma made de up upon on th thee wi wire ress before bef ore str strand anding ing or upo upon n wir wires es rem remove oved d fro from m the com comple plete te stranded conductor, but need not be made upon both. Care shall be taken to avoid mechanical injury to wire removed from the conductor for the purpose of testing. 7.3 The phy physica sicall pro proper perties ties of wir wiree whe when n tes tested ted bef before ore stranding shall conform to the applicable requirements of 13.2 of 13.2.. 7.4 Th 7.4 Thee ph phys ysica icall pr prop oper ertie tiess of wi wire ress re remo move ved d fr from om th thee completed stranded conductor shall be permitted to vary from the applicable requirements of 13.2 by 13.2 by the following amounts (Explanatory Note (Explanatory Note 4): 4): 7.4.1 Average of Results Obtained on All Wires Tested— The The minimum elongation required shall be reduced in numerical value 5 (for example, from 30 to 25 %) from the numerical requirements for the wire before stranding. 7.4.2 Results Obtained on Individual Wires— The The elongation of individual wires shall be reduced in numerical value 15 from the min minimu imum m req requir uireme ements nts bef before ore str strand anding ing (th (that at is, 10 in addition to the 5 allowed in 7.4.1) 7.4.1), but in no case shall the
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B8 − 11 (2017) TABLE 3 Diameters, Areas, and Mass of Concentric-Lay-Stranded Copper Conductors (Explanatory Note 8) 8) Nominal Conductor Diameter, in.A
Size of Conductor,
cmil cm il or AWG nu numb mber ers s
* 5 00 0 0 00 c m i l 4 50 0 0 0 0 c mi l 4 00 0 0 0 0 c mi l 3 50 0 0 0 0 c mi l * 3 00 0 0 00 c m i l * 2 50 0 0 00 c m i l * 2 00 0 0 00 c m i l 1 90 0 0 0 0 c mi l 1 80 0 0 0 0 c mi l * 1 75 0 0 00 c m i l 1 70 0 0 0 0 c mi l 1 60 0 0 0 0 c mi l * 1 50 0 0 00 c m i l 1 40 0 0 0 0 c mi l 1 30 0 0 0 0 c mi l * 1 25 0 0 00 c m i l 1 20 0 0 0 0 c mi l 1 10 0 0 0 0 c mi l * 1 00 0 0 00 c m i l 9 00 00 0 c m i l * 8 00 00 0 c m i l * 7 50 00 0 c m i l * 7 00 00 0 c m i l 6 50 00 0 c m i l * 6 00 00 0 c m i l 5 50 00 0 c m i l * 5 00 00 0 c m i l 4 50 00 0 c m i l * 4 00 00 0 c m i l * 3 50 00 0 c m i l * 3 00 00 0 c m i l * 2 50 00 0 c m i l * No. 0000 * No. 000 * No. 00 * No. 0 * No. 1, 3 wire * No. 1 * No. 2, 3 wire * No. 2 * No. 3, 3 wire * No. 3 * No. 4, 3 wire * No. 4 * No. 5 * No. 6 * No. 7 * No. 8 * No. 9 * No. 10 * No. 12 * No. 14 * No. 16 * No. 18 * No. 20 * No. 22 * No. 24
Concentric Strand
mm2
Class AA
Class A
Class B
2 53 0 22 8 0 20 3 0 17 7 0 1 52 0 1 27 0 1 01 0 963 912 887 861 801 760 709 659 633 608 557 507 456 4 05 3 80 3 55 329 3 04 279 2 53 228 2 03 1 77 1 52 1 27 1 07 8 5 .0 6 7. 4 5 3 .5 4 2. 4 4 2 .4 3 3. 6 3 3 .6 2 6. 7 2 6 .7 2 1. 2 2 1 .2 1 6 .8 1 3 .3 1 0 .6 8 .3 7 6 .6 3 5 .2 6 3 .3 1 2 .0 8 0 .8 2 3 0 .5 1 9 0 .5 1 9 0 .3 2 4 0 .2 0 5
.. . ... ... ... .. . .. . .. . .. . .. . . .. .. . .. . . .. .. . .. . . .. .. . .. . 1 .1 5 1 1 .0 9 2 1 .0 2 9 0 .9 9 7 0 .9 6 3 0 .9 2 8 0 .8 9 1 0 .8 5 3 0.811 0 .7 7 0 0 .7 2 6 0 .7 1 0 0 .6 5 7 0 .6 0 0 0 .5 2 2 0 .4 6 4 0. 41 4 0 .3 6 8 0 .3 6 0 . .. 0 .3 2 0 . .. 0 .2 8 5 . .. 0 .2 5 4 . .. . .. . .. . .. . .. . .. .. . .. . .. . .. . .. . .. . .. . .. .
2 .5 8 0 2 .4 4 8 2 .3 0 7 2 .1 5 8 1 .9 9 8 1 .8 2 3 1 .6 3 0 1 .5 9 0 1 .5 4 7 1 .5 2 6 1 .5 0 4 1 .4 5 9 1.411 1 .3 6 4 1 .3 1 4 1 .2 8 8 1 .2 6 3 1 .2 0 9 1. 15 2 1 .0 9 4 1 .0 3 1 0 .9 9 8 0 .9 6 4 0 .9 2 9 0 .8 9 1 0 .8 5 3 0 .8 1 3 0 .7 7 2 0 .7 2 6 0 .6 7 9 0 .6 2 9 0 .5 7 4 0 .5 2 2 0 .4 6 4 0. 41 4 0. 36 8 .. . 0. 32 8 .. . 0. 29 2 .. . 0. 26 0 .. . 0. 23 2 . .. . .. . .. . .. . .. ... ... ... . .. . .. . .. . .. . ..
2 .5 8 1 2 .4 4 8 2 .3 0 9 2 .1 5 9 1 .9 9 8 1 .8 2 4 1 .6 3 2 1 .5 9 0 1 .5 4 8 1 .5 2 6 1 .5 0 4 1 .4 5 9 1 .4 1 2 1 .3 6 4 1 .3 1 5 1 .2 8 9 1 .2 6 3 1 .2 0 9 1 .1 5 2 1. 09 4 1 .0 3 1 0 .9 9 8 0 .9 6 4 0. 92 9 0 .8 9 3 0. 85 5 0 .8 1 3 0. 77 2 0 .7 2 8 0 .6 8 1 0 .6 3 0 0 .5 7 5 0 .5 2 8 0 .4 7 0 0 .4 1 9 0. 37 3 ... 0 .3 3 2 ... 0 .2 9 2 ... 0 .2 6 0 ... 0 .2 3 2 0 .2 0 6 0 .1 8 4 0 .1 6 4 0 .1 4 6 0 .1 3 0 0.116 0 .0 9 1 5 0 .0 7 2 6 0 .0 5 7 6 0 .0 4 5 6 0 .0 3 6 3 0 .0 2 8 8 0 .0 2 2 8
Reverse Concentric Unilay ComCompressed pressedC Class B Diameter, in. Diameter, in. . .. ... ... ... . .. . .. 1 .5 8 3 1 .5 4 2 1 .5 0 2 1. 48 0 1 .4 5 9 1 .4 1 5 1. 37 0 1 .3 2 3 1 .2 7 5 1. 25 0 1 .2 2 5 1 .1 7 3 1.117 1 .0 6 0 1. 00 0 0. 96 8 0. 93 5 0 .9 0 1 0. 86 6 0 .8 2 9 0. 78 9 0 .7 4 9 0. 70 6 0. 66 1 0.611 0. 55 8 0 .5 1 2 0 .4 5 6 0 .4 0 5 0. 36 2 ... 0 .3 2 2 ... 0 .2 8 3 ... 0 .2 5 2 ... 0 .2 2 5 0 .2 0 0 0 .1 7 8 0 .1 5 9 0 .1 4 2 0 .1 2 6 0.113 0. 08 9 0. 07 1 ... ... ... ... ...
dc Resistance Resistance at 20°CB
Mass
. .. .. . .. . .. . . .. . .. 1 .5 3 3 1 .4 9 4 1 .4 5 4 1 .4 3 4 1 .4 1 3 1 .3 7 1 1 .3 2 7 1 .2 8 2 1 .2 3 6 1 .2 1 2 1 .1 8 7 1 .1 3 7 1 .0 8 4 1. 02 8 0 .9 6 9 0 .9 3 9 0 .9 0 7 0. 87 4 0 .8 4 0 0. 80 4 0 .7 6 6 0. 72 7 0 .6 8 5 0 .6 4 1 0 .5 9 4 0 .5 4 2 0 .4 9 8 0 .4 4 3 0 .3 9 5 0 .3 5 2 . .. 0. 31 3 . .. .. . . .. .. . . .. .. . ... ... ... ... ... . .. .. . .. . ... ... ... ... ...
Area, in.2 l b s /1 0 0 0 ft
3. 92 7 3 .5 3 4 3 .1 4 2 2 .7 4 9 2. 35 6 1. 96 3 1. 57 1 1 .4 9 2 1 .4 1 4 1 .3 7 4 1 .3 3 5 1 .2 5 7 1 .1 7 8 1 .1 0 0 1 .0 2 1 0 .9 8 1 7 0 .9 4 2 5 0 .8 6 3 9 0. 78 5 4 0 .7 0 6 9 0 .6 2 8 3 0 .5 8 9 0 0 .5 4 9 8 0 .5 1 0 5 0 .4 7 1 2 0 .4 3 2 0 0 .3 9 2 7 0 .3 5 3 4 0 .3 1 4 2 0 .2 7 4 9 0 .2 3 5 6 0 .1 9 6 3 0 .1 6 6 2 0 .1 3 1 8 0. 10 4 5 0 .0 8 2 8 9 0. 06 5 73 0 .0 6 5 7 3 0. 05 2 13 0 .0 5 2 1 3 0. 04 1 34 0 .0 4 1 3 4 0. 03 2 78 0 .0 3 2 7 8 0 .0 2 6 0 0 0 .0 2 0 6 2 0 .0 1 6 3 5 0 .0 1 2 9 7 0 .0 1 0 2 8 0 .0 0 8 1 5 5 0 .0 0 5 1 2 9 0 .0 0 3 2 2 5 0. 00 2 02 8 0. 00 1 27 6 0 .0 0 0 8 0 2 3 0 .0 0 0 5 0 6 7 0 .0 0 0 3 1 7 6
15 890 14 30 0 12 59 0 11 020 9 3 53 7 7 94 6 1 75 5 866 5 558 5 403 5 249 4 940 4 631 4 323 4 014 3 8 59 3 705 3 396 3 088 2 779 2 4 70 2 3 16 2 1 61 2 007 1 8 53 1 698 1 5 44 1 389 1 2 35 1 0 81 9 2 6 .3 7 7 1 .9 6 5 3. 1 5 1 8. 1 4 1 0 .9 3 2 5 .8 2 5 5 .9 2 5 8. 4 2 0 2 .9 2 0 4 .9 1 6 0 .9 1 6 2 .5 1 2 7 .6 1 2 8 .9 1 0 2. 2 8 1 .0 5 6 4 .2 8 5 0 .9 7 4 0 .4 2 3 2. 06 2 0 .1 6 1 2 .6 8 7 .9 7 4 5 .0 1 5 3 .1 5 4 1 .9 9 2 1 .2 4 9
k g/ k m
23 64 9 21 283 18 738 16 401 1 3 92 0 11 600 9 19 0 8 73 0 8 27 2 8 04 1 7 81 2 7 35 2 6 89 2 6 43 5 5 97 4 5 74 3 5 514 5 054 4 59 6 4 13 6 3 6 76 3 4 47 3 2 16 2 98 7 2 7 58 2 52 7 2 2 98 2 06 7 1 8 38 1 6 09 1 3 7 8. 6 1 1 4 8. 8 9 7 2 .0 7 7 1 .1 611.5 4 8 4 .9 3 8 0 .9 3 8 4 .6 3 0 1 .9 3 0 4. 9 2 3 9 .5 2 4 1. 9 1 8 9 .9 1 9 1. 8 1 5 2 .1 1 2 0 .6 3 9 5. 67 7 5. 86 6 0. 16 4 7. 72 3 0 .0 0 1 8 .8 7 11.868 7. 46 4 4. 69 4 2. 96 5 1. 85 9
Ω /1000 ft
0. 00 2 18 0 .0 0 2 4 2 0 .0 0 2 7 0 0 .0 0 3 0 8 0 .0 0 3 5 6 0 .0 0 4 2 7 0. 00 5 29 0. 00 5 57 0. 00 5 88 0 .0 0 6 0 4 0. 00 6 22 0. 00 6 61 0 .0 0 7 0 5 0. 00 7 56 0. 00 8 14 0. 00 8 46 0 .0 0 8 8 2 0 .0 0 9 6 2 0 .0 1 0 6 0.0118 0. 01 32 0. 01 41 0. 01 51 0 .0 1 6 3 0. 01 76 0 .0 1 9 2 0. 02 12 0 .0 2 3 5 0. 02 64 0. 03 02 0 .0 3 5 3 0 .0 4 2 3 0 .0 5 0 0 0 .0 6 3 0 0 .0 7 9 5 0 .1 0 0 0. 12 6 0 .1 2 6 0. 15 9 0 .1 5 9 0. 20 1 0 .2 0 1 0. 25 3 0 .2 5 3 0. 31 9 0 .4 0 3 0. 50 9 0. 64 0 0. 80 9 1. 02 1 .6 3 2 .5 8 4. 10 6. 54 1 0. 3 1 6. 4 2 6. 1
Ω /km
0 .0 0 7 1 5 0 .0 0 7 9 4 0 .0 0 8 8 6 0.0101 0. 0.0117 0. 0.0140 0. 0 . 01 7 4 0. 0.0183 0. 0.0193 0. 0 .0 1 9 8 0. 0.0204 0. 0.0217 0. 0 .0 2 3 1 0. 0.0248 0. 0.0267 0. 0 . 02 7 8 0. 0 . 02 8 9 0. 0 . 03 1 6 0. 0 .0 3 4 8 0 .0 3 8 7 0 .0 4 3 3 0 .0 4 6 2 0 .0 4 9 5 0 .0 5 3 5 0 .0 5 7 8 0 .0 6 3 0 0 .0 6 9 5 0 .0 7 7 1 0 .0 8 6 6 0 .0 9 9 1 0.116 0 .1 3 9 0. 16 4 0 .2 0 7 0 .2 6 1 0 .3 2 8 0. 41 3 0 .4 1 3 0. 52 2 0 .5 2 2 0. 65 9 0 .6 5 9 0. 83 0 0 .8 3 0 1. 05 1 .3 2 1. 67 2. 10 2. 65 3 .3 5 5. 35 8. 46 1 3. 45 2 1 .4 6 3 3 .8 5 3 .8 8 5 .6
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B8 − 11 (2017) Numb Nu mber er of Wi Wire res s in Co Cond nduc ucto torr 3 7 12 19 37 61 91 127 169 217 271
Fact Fa ctor or to Ca Calc lcul ulat ate e Conductor Diameter 2 .1 5 5 3 4 .1 5 5 5 7 9 11 13 15 17 19
7.7 If a tinnin tinning, g, lead-coating, lead-coating, or lead-a lead-alloy-c lloy-coating oating test is required, it shall be made on the wires prior to stranding. 8. Physical and Electrical Tests Tests of Conductors Stranded of Hard-Drawn or Medium-Hard-Drawn Wires 8.1 Tests for the physi physical cal and electrical properties properties of wires compos com posing ing con conduc ductor torss mad madee fro from m har hard-d d-draw rawn n or med medium ium-hard-drawn wires, uncoated or coated, shall be made before but not after stranding. 8.2 At the option of the purch purchaser aser,, tension and elongation tests on hard-drawn and medium-hard-drawn wires, uncoated or coated, before stranding may be waived, and the completed hard-drawn and medium-hard-drawn conductors may be tested as a unit. The breaking strength of the bare conductors so tested shall be at least 90 % of the total of the specified minimum breaki bre aking ng str streng engths ths of the com compon ponent ent wir wires. es. The max maximu imum m breaki bre aking ng str streng ength th of con conduc ductor torss mad madee fro from m med medium ium-ha -hardrddrawn wires, uncoated or coated, shall be not greater than the sum su m of th thee sp spec ecifie ified d ma maxi ximu mum m br brea eaki king ng st stre reng ngth thss of th thee compon com ponent ent wir wires. es. The min minimu imum m bre breaki aking ng stre strengt ngth h of wir wires es shall sha ll be cal calcula culated ted usi using ng spe specifi cified ed nom nomina inall diam diameter eterss and specified minimum tensile strengths. The maximum breaking strengths of wires shall be calculated using nominal diameters and spe specifie cified d max maximu imum m tens tensile ile str streng engths ths.. The fre freee len length gth between grips of the test specimen shall be not less than 24 in., and care shall be taken to ensure that the wires in the conductor are evenly gripped during the test (Explanatory Note 5) 5 ). 8.3 When requested requested by the purchaser purchaser at the time of placing the order, tension tests on hard-drawn and medium-hard-drawn wires, uncoated or coated, before stranding or as a unit may be waived and tests made on wires removed from the completed conductor. The test limits, based on a 10-in. gage length, for such tests shall be specified by the purchaser in the placing of individual orders (Explanatory Note 4) 4). 8.4 If a tinning test is required, required, it shall be made on the wires prior to stranding. 9. Densi Density ty
The approximate mass and electrical resistance may be determined using the standard increments shown in Table 4. 4. When greater accuracy is desired, the increment based on the specific lay of the conductor may be calculated (Explanatory Note 7). 7). 10.2 The maximum maximum electrical resistance resistance of a unit length of stranded conductor shall not exceed 2 % over the nominal dc resistance shown in Table in Table 3 (Explanatory 3 (Explanatory Note Note 8). 8). When the dc resistance is measured at other than 20°C, it is to be corrected by using the multiplying factor given in Table 5. 5. 10.3 For conductors conductors to be used in covered or insulated wires wires or cab cables, les, or twis twisted ted cab cable le ass assemb emblies lies,, dir direct ect cur curren rentt (dc (dc)) resista res istance nce meas measure uremen mentt may be use used d ins instead tead of the met method hod outline out lined d in Sec Section tion 11 11,, to det determ ermine ine com complia pliance nce wit with h this specification. For the purpose of this standard a cable is defined as either a single-conductor or multiple-conductor group comprised pri sed of ins insulat ulated ed or cov covered ered con conduc ductor tor(s) (s) and an ove overal ralll common covering or jacket. The multiple-conductor cable may contain contai n one or more bare condu conductors. ctors. The single single-cond -conductor uctor cable may or may not have an overall jacket layer. For the purpose of this standard, a twisted cable assembly is a grouping of individual single insulated cables, twisted together without an overall covering or jacket applied to the twisted assembly. The twisted assembly may contain one or more bare conductors. 11. Variation in Area 11.1 11 .1 The area of cross section of the compl completed eted conductor conductor shall be not less than 98 % of the area indicated in Column 1 of Table 1. of 1. Unless otherwise specified by the purchaser, the manufacturer may have the option of determining the crosssectional area by either of the following methods, except that in casee of que cas questio stion n reg regard arding ing are areaa com compli plianc ance, e, the meth method od of 11.1.2 shall be used.
TABLE 4 Standard Increments Due to Stranding Increment of
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B8 − 11 (2017) TABLE 5 Temperature Corrections Factor for Conductor Resistance Temperature, °C 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90
Multiplying Factor for Conversion Conver sion to 20°C 1 .0 8 5 1 .0 6 3 1 .0 4 1 1 .0 2 0 1 .0 0 0 0 .9 8 1 0 .9 6 2 0 .9 4 4 0 .9 2 7 0.911 0 .8 9 5 0 .8 7 9 0 .8 6 4 0 .8 5 0 0 .8 3 6 0 .8 2 2 0 .8 0 9 0 .7 9 7 0 .7 8 4
11. 1.1. 1.1 1 Th Thee ar area ea of cr cros osss se secti ction on of a co cond nduc ucto torr ma may y be determined by calculations from diameter measurements, expressed to four decimal places, of its component wires at any point when measured perpendicularly to their axes. 11. 1.1. 1.2 2 Th Thee ar area ea of cr cros osss se secti ction on of a co cond nduc ucto torr ma may y be determined by Test Method B263 Method B263.. In applying that method, the increment in mass resulting from stranding may be the applicable value specified in 10.1 or may be calculated from the measured component dimensions of the sample under test. In case of question regarding area compliance, the actual mass increment due to stranding shall be calculated. (Explanatory Note 7) 7) 12. Variation in Diameter 12.1 The average 12.1 average dia diamete meterr of the con conduc ductor tor shall vary by not more than +1 or −2 % from the nominal diameters specified in Table in Table 3. 3. 13. Requireme Requirements nts for Wires Wires 13.1 The purchaser purchaser shall designate designate the type of wire and the kind of coating, if any, to be used in the conductor. 13.2 Before stranding stranding,, the copper wire used shall meet all of the requirements of the following specifications of ASTM that are applicable to its type:
13.2.1 13.2.1 13.2.2 13.2. 2 13.2.3 13.2. 3 13.2.4 13.2. 4 13.2.5 13.2. 5 13.2.6 13.2. 6
Specification B3 Specification B3,, Specification Specific ation B33 B33,, Specification Specific ation B2 B2,, Specification Specific ation B1 B1,, Specification Specific ation B189 B189,, and Specification Specific ation B246 B246..
13.3 In concentric-lay-str concentric-lay-stranded anded conductors conductors the centra centrall core shall be made of wire of the same type and temper as the concentric concen tric layers layers,, unless otherwise specifi specified. ed. 14. Inspe Inspectio ction n 14.1 Unless otherwise otherwise specified in the contra contract ct or purch purchase ase order ord er,, the man manufa ufactur cturer er sha shall ll be res respon ponsib sible le for the per perfor for-mance of all inspection and test requirements specified. 14.2 All inspections inspections and tests shall shall be made at the place of manufacture unless otherwise especially agreed upon by the manufacturer and the purchaser at the time of purchase. 14.3 The manufacturer manufacturer shall af afford ford the inspec inspector tor representrepresenting the purch purchaser aser all reason reasonable able manufacturer’s manufacturer’s facilities to satisfy him that the material is being furnished in accordance with this specification. 15. Pack Packagin aging g and Pack Package age Marking Marking 15.1 Packag Packagee sizes for cond conductors uctors shall be agreed upon by the manufacturer and the purchaser in the placing of individual orders (Explanatory Notes 9 and 11) 11 ). 15.2 The conductors conductors shall be prote protected cted against damage in ordina ord inary ry han handlin dling g and shi shippi pping. ng. If hea heavy vy woo wood d lagg lagging ing is required, it shall be specified by the purchaser at the time of purchase. 15.3 The 15.3 The ne nett ma mass ss,, le leng ngth th (o (orr le leng ngth thss an and d nu numb mber er of lengths, if more than one length is included in the package), size, kind of conductor, purchase order number, and any other marks required by the purchase order shall be marked on a tag attached to the end of the conductor inside of the package. The samee inf sam inform ormatio ation, n, tog togeth ether er wit with h the man manufa ufactur cturer’ er’ss ser serial ial numb nu mber er (i (iff an any) y) an and d all sh ship ippi ping ng ma mark rkss re requ quir ired ed by th thee purchaser, shall appear on the outside of each package. 16. Keyw Keywords ords 16.1 concentric-lay-stranded copper copper conductors; conductors; concentriclay-stranded lay-strande d hard; copper condu conductors ctors;; copp copper er condu conductors ctors for electrical purposes; medium-hard; or soft copper conductors
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B8 − 11 (2017) TABLE 6 Sugges Suggested ted Package Lengt Lengths hs for Hard and Medium-Hard Medium-Hard Class AA Conductors Conductors A,B Size of Conductor, cmil or AWG numbers
Number of Wires
Nominal Shipping Unit
Approximate Dimensions of Suitable Reel
Approximate Length,, ft Length
Conductor Mass, lb
Mass per Wire, lb
Flange Diameter, in.
Traverse Width, in.
Drum Diameter, in.
5 00 00 0 4 00 00 0 3 50 00 0 3 50 00 0
c mi l c mi l c mi l c mi l
19 19 12 19B
3 5 50 4 4 50 3 2 00 5 10 0
55 1 0 55 1 0 34 8 0 5 5 10
290 290 290 290
54 54 48 54
32 32 24 32
32 32 24 32
3 00 00 0 3 00 00 0 2 50 00 0 2 50 00 0
c mi l c mi l c mi l c mi l
12 19B 12 19B
3 7 50 5 95 0 4 5 00 7 15 0
34 8 0 5 5 10 34 8 0 5 5 10
290 290 290 290
48 54 48 54
24 32 24 32
24 32 24 32
No. No. No. No.
0 00 0 0 00 00 0
7 7 7 7
31 00 39 0 0 4 95 0 62 5 0
2 03 0 2 03 0 2 0 30 2 03 0
29 0 2 90 290 29 0
42 42 42 42
24 24 24 24
30 30 30 30
No. No. No. No.
1 2 3 4
3 3 3 3
46 0 0 58 0 0 73 0 0 92 0 0
1170 1170 1170 1170
39 0 39 0 39 0 39 0
36 36 36 36
18 18 18 18
24 24 24 24
A
These package lengths are based on conductors furnished without joints or with a minimum of joints in the finished wires composing the completed conductor. These The se opt option ional al con constr struct uction ion (Cl (Class ass A) are inc includ luded ed as sug sugges gestio tions ns for use whe when n the pur purcha chase se ord order er spe specifi cifies es Cla Class ss A con constr struct uction ion for bar bare e har hard-d d-draw rawn n or medium-hard-drawn conductors. B
EXPLANATORY NOTES NOTE 1—In this specification only concentric-lay-stranded conductor constructionss are specifi construction specifically cally desig designated. nated. Requirements Requirements for certai certain n other construction constr uctionss will be found in Speci Specificatio fications ns B172, B172, B173, B173, B174, B174, and B787/B787M.. Conduc B787/B787M Conductor tor con constr struct uction ionss not inc includ luded ed in any of the these se specifications should be specifically agreed upon by the manufacturer and the purchaser when placing the order. NOTE 2—For 2—For defi definiti nitions ons of ter terms ms rela relatin ting g to con conduc ductor tors, s, ref refer er to Terminology B354 B354.. NOTE 3—Certain types of insulated conductors may require a shorter lay tha than n oth other er con conduc ductor tors. s. It is exp expect ected ed tha thatt spe special cial req requir uireme ements nts rega re gard rdin ing g le leng ngth th of la lay y wi will ll be sp spec ecifi ified ed by th thee pu purc rcha hase serr in su such ch instances. NOTE 4—Wires unlaid from conductors manifestly will have different physical and electrical properties from those of the wire when prepared for cabling, on account of the deformation brought about by laying and again straightenin straig htening g for test. NOTE 5—To test stranded conductors for tensile strength successfully as a un unit it re requ quir ires es an ad adeq equa uate te me mean anss of gr grip ippi ping ng th thee en ends ds of th thee tes testt specimen. Various means are available, such as a long tube or socket into
concentric-lay-stranded conductor, k , in percent, is calculated as follows: k 5 100 ~ m 2 1 ! where m is the lay factor, and is the ratio of the mass or electrical resi re sist stan ance ce of a un unit it len lengt gth h of st stra rand nded ed co cond nduc ucto torr to th that at of a so soli lid d conductor of the same cross-sectional area or of a stranded conductor with infinite length of lay, that is, all wires parallel to the conductor axis. The lay fac factor tor m for the com comple pleted ted str strand anded ed con conduc ductor tor is the numerical average of the lay factors for each of the individual wires in the conductor, including the straight core wire, if any (for which the lay factor is unity). The lay fac factor tor,, mind, for any giv given en wir wiree in a con concen centri tric-l c-layay-str strand anded ed conductor is m ind 5 = 1 1 ~ 9.8696/ n 2 ! where n = length of lay/diameter of helical path of wire. The derivation of the above is given in NBS Handbook 1003.
NOTE 8—The dc resistance, on a given construction, shall be calculated using the following formula:
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B8 − 11 (2017) resistance, and mass per unit length of the variou resistance, variouss const constructio ructions ns referred to in Table in Table 1. 1. NOTE 11—Be 11—Becau cause se of the pro prohib hibitio ition n of joi joints nts in har hard-d d-draw rawn n or medium-har mediu m-hard-dra d-drawn wn Class AA conductors of seven wires or less, it is necessary that the lengths of conductors specified in the purchase order be such as practicably may be furnished by the manufacturer. In general, the maximum practicable length of such conductors is determined by the mass of one of the component wires which can be placed on a spool or bobbin
in the stranding machine. It is suggested that consideration be given to standardizing package lengths of Class AA conductors as prescribed in Table 6, which which is bas based ed on a con consta stant nt mas masss for the ind indivi ividua duall wir wires es composing the conductor. To cooperate with the manufacturer in avoiding the accumulation of excessive amounts of scrap wire, it is suggested that package sizes permit ordinary variations of 610 % in package lengths, and tha thatt occ occasi asiona onall sho short rt len length gthss be per permit mitted ted,, suc such h pac packag kages es to be distinctly marked.
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