1、Designation: B496 14Standard Specification forCompact Round Concentric-Lay-Stranded CopperConductors1This standard is issued under the fixed designation B496; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revisio
2、n. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers bare compact roundconcentric-lay-stranded conductors made from uncoated roundcopper wires for general us
3、e for electrical purposes. Theseconductors shall be constructed with a central core surroundedby one or more layers of helically laid compacted wires(Explanatory Note 1 and Note 2).1.2 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematic
4、alconversions to SI units that are provided for information onlyand are not considered standard.1.2.1 For density, resistivity, and temperature, the valuesstated in SI units are to be regarded as standard.2. Referenced Documents2.1 The following documents of the issue in effect on dateof material pu
5、rchase form a part of this specification to theextent referenced herein:2.2 ASTM Standards:2B3 Specification for Soft or Annealed Copper WireB263 Test Method for Determination of Cross-SectionalArea of Stranded ConductorsB354 Terminology Relating to Uninsulated Metallic Electri-cal Conductors3. Orde
6、ring Information3.1 Orders for material under this specification shall includethe following information:3.1.1 Quantity of each size (Table 1),3.1.2 Conductor size; circular-mil area or AWG, (Section 6and Table 1),3.1.3 Packaging (Section 15), if required,3.1.4 Special package marking, and3.1.5 Place
7、 of inspection (Section 14).4. Joints4.1 Welds and brazes may be made in rods or in wires priorto final drawing.4.2 Welds and brazes may be made in the individual rounddrawn wires for compact conductors, but shall not be closertogether than 1 ft (300 mm) for conductor of 19 wires or lessor closer th
8、an 1 ft (300 mm) in a layer for conductor of morethan 19 wires.4.3 No joint nor splice shall be made in a compact-strandedconductor as a whole.5. Lay5.1 The lay length of the wires shall not be less than 8 normore than 16 times the outside diameter of the finishedconductor. The maximum length of lay
9、 for compact conductorsAWG 2 (33.6 mm2) and smaller shall be 17.5 times the outsidediameter of that layer. For conductors of 37 wires or more, thisrequirement shall apply to the wires of the outer two layers.The lay of the layers other than the outer two layers shall be atthe option of the manufactu
10、rer, unless otherwise agreed upon.5.2 The direction of lay of the outer layer shall be left-hand,and it shall be reversed in successive layers, unidirectional, orunilay.6. Construction6.1 The construction of the compact round concentric-lay-stranded conductors shall be as shown in Table 1.6.2 The st
11、arting round copper wires used in the fabricationof the compact round conductor shall be of such diameter as toproduce a finished conductor having a nominal cross-sectionalarea and diameter as prescribed in Table 1.7. Density7.1 For the purpose of calculating linear densities, crosssections, and so
12、forth, the density of the copper shall be takenas 8.89 g/cm3(0.32117 lb/in.3) at 20C.1This specification is under the jurisdiction of ASTM Committee B01 onElectrical Conductors and is the direct responsibility of Subcommittee B01.04 onConductors of Copper and Copper Alloys.Current edition approved A
13、pril 1, 2014. Published April 2014. Originallyapproved in 1969. Last previous edition approved in 2013 as B496 13a. DOI:10.1520/B0496-14.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume i
14、nformation, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States18. Mass and Resistance8.1 The mass per unit length and dc electrical resistance ofa compact round conductor ar
15、e greater than the total of thesecharacteristics of the compressed wires composing the finishedconductor, depending upon the lay. The standard increment ofmass per unit length and electrical resistance shall be taken as2 %. The nominal mass per unit length and dc resistance areshown in Table 1. When
16、 the dc resistance is measured at otherthan 20C, it shall be corrected by using the multiplying factorsgiven in Table 2.8.2 In cases where the lay is definitely known, the incrementmay be calculated if desired (Explanatory Note 3).8.3 For conductors to be used in covered or insulated wiresor cables,
17、 direct current (DC) resistance measurement may beused instead of the method outlined in Section 9, to determinecompliance with this specification.9. Variation in Area9.1 The cross-sectional area of the compact round conductorshall be not less than 98 % of the cross-sectional area asspecified in Col
18、umn 1 of Table 1.9.2 The manufacturer shall determine the cross-sectionalarea by Test Method B263. In applying this method, theincrement in mass per unit length resulting from stranding maybe the applicable value specified in 9.1 or may be calculatedfrom the measured dimensions of the sample under t
19、est. In caseof question regarding area compliance, the actual mass per unitlength increment due to stranding shall be calculated.10. Variation in Diameter10.1 The average diameter of the compact-round conductorshall not vary by more than +1 % and 2 % from the diameterspecified in Table 1.11. Finish1
20、1.1 The conductor surface shall be smooth and free ofimperfections not consistent with the best commercial practice.TABLE 1 Construction Requirements of Compact Round Concentric-Lay-Stranded Copper ConductorsConductor SizeNumber ofWiresNominal Compact ConductorDiameterNominal Mass,lb/1000 ftNominal
21、Mass,kg/kmNominal DC Resistance at20Ccmil AWG mm2in. mm /1000 ft /km1 500 000 . 760 91A,B1.299 33.0 4631 6892 0.00705 0.02311 250 000 . 633 91A,B1.184 30.1 3859 5743 0.00846 0.02781 100 000 . 557 91A,B1.112 28.2 3396 5054 0.00962 0.03161 000 000 . 507 61C1.060 26.9 3086 4590 0.0106 0.0347900 000 . 4
22、56 61C0.999 25.4 2780 4140 0.0118 0.0386800 000 . 405 61C0.938 23.8 2469 3680 0.0132 0.0433750 000 . 380 61C0.908 23.0 2316 3450 0.0141 0.0462700 000 . 355 61C0.877 22.3 2160 3220 0.0151 0.0495650 000 . 329 61C0.845 21.4 2006 2990 0.0163 0.0535600 000 . 304 61C0.813 20.6 1850 2760 0.0176 0.0577550 0
23、00 . 279 61C0.775 19.7 1700 2530 0.0192 0.0630500 000 . 253 37D0.736 18.7 1542 2300 0.0212 0.0695450 000 . 228 37D0.700 17.8 1390 2070 0.0235 0.0770400 000 . 203 37D0.659 16.7 1236 1840 0.0264 0.0865350 000 . 177 37D0.616 15.7 1080 1610 0.0302 0.0990300 000 . 152 37D0.570 14.5 925 1380 0.0353 0.1162
24、50 000 . 127 37D0.520 13.2 772 1150 0.0423 0.139211 600 4/0 107 19E0.475 12.1 653 972 0.0500 0.164167 800 3/0 85.0 19E0.423 10.8 518 771 0.0630 0.206133 100 2/0 67.4 19E0.376 9.57 411 611 0.0795 0.261105 600 1/0 53.5 19E0.336 8.55 326 485 0.100 0.32883 690 1 42.4 19E0.299 7.60 259 385 0.126 0.41366
25、360 2 33.6 7 0.268 6.81 205 305 0.159 0.52141 740 4 21.2 7 0.213 5.41 129 192 0.253 0.83026 240 6 13.3 7 0.169 4.29 80.9 121 0.403 1.3216 510 8 8.37 7 0.134 3.40 51.0 75.9 0.641 2.10A85 wires minimum.BAs agreed upon between the manufacturer and the customer, these sizes may be produced with a 61 to
26、58 wire construction of the appropriate wire size.C58 wires minimum.D35 wires minimum.E18 wires minimum.TABLE 2 Temperature Correction Factors for ConductorResistanceTemperature, CMultiplying Factor for Conversion to20C0 1.0855 1.06310 1.04115 1.02020 1.00025 0.98130 0.96235 0.94440 0.92745 0.91150
27、0.89555 0.87960 0.86465 0.85070 0.83675 0.82280 0.80985 0.79790 0.784B496 14212. Physical and Electrical Tests12.1 Tests for the physical and electrical properties of wirescomposing the conductors shall be made before stranding inaccordance with Specification B3 (Explanatory Note 4 andNote 5).13. Re
28、quirements for Wires13.1 Before stranding and compacting the copper wire shallmeet all of the requirements of Specification B3.13.2 Wire shaped before stranding shall meet the require-ments of Specification B3, except for diameter tolerance. Theelongation requirement shall be the same as round wires
29、 ofequal nominal area. The area tolerance for shaped wires shallbe such that the finished conductor conforms to Section 10 ofthis specification.14. Inspection14.1 All tests and inspection shall be made at the place ofmanufacture unless otherwise especially agreed upon betweenthe manufacturer and the
30、 purchaser at the time of purchase. Themanufacturer shall afford the inspector representing the pur-chaser all reasonable facilities, without charge, to satisfy himthat the material is being furnished in accordance with thisspecification.15. Packaging and Package Marking15.1 Package sizes for conduc
31、tors shall be agreed upon bythe manufacturer and the purchaser in the placing of individualorders.15.2 The conductors shall be protected against damage inordinary handling and shipping.15.3 The net mass, length, size, kind of conductor, purchaseorder number, and any other marks required by the purch
32、aseorder shall be marked on a tag attached to the end of theconductor inside of the package. The same information, to-gether with the manufacturers serial number (if any) and allshipping marks required by the purchaser, shall appear on theoutside of each package.16. Keywords16.1 compact copper condu
33、ctor; compact round concentric-lay-stranded copper conductor; concentric-lay-stranded copperconductor; copper electrical conductor; electrical conductor;electrical conductorcopper; stranded copper conductorEXPLANATORY NOTESNOTE 1In this specification only compact round concentric-lay-stranded conduc
34、tor constructions are specifically designated. Construc-tions not included in this specification should be specifically agreed uponbetween the manufacturer and the purchaser when placing the order.NOTE 2For definitions of terms relating to conductors, referenceshould be made to Terminology B354.NOTE
35、 3The increment of mass or electrical resistance of a completedconcentric-lay-stranded conductor, k, in percent, is:k 5 100 m 2 1!where m is the stranding factor, and is the ratio of the mass or electricalresistance of a unit length of stranded conductor to that of a solidconductor of the same cross
36、-sectional area or of a stranded conductor withinfinite length of lay, that is, all wires parallel to the conductor axis. Thestranding factor m for the completed stranded conductor is the numericalaverage of the stranding factors for each of the individual wires in theconductor, including the straig
37、ht core wire, if any (for which the strandingfactor is unity). The stranding factor, mind, for any given wire in aconcentric-lay-stranded conductor is:mind5 = 119.8696/n2!where n = (length of lay)/diameter of helical path of the wire.The derivation of the above as given in NBS Handbook 1003is basedo
38、n round wire constructions which are applicable to compacted wireconstructions.NOTE 4Individual wires are not to be unlaid from compact roundconductors for testing purposes. The physical properties of the individualcompacted wires will be altered by the deformation brought about bycompacting, unlayi
39、ng, and straightening for test.NOTE 5To test stranded conductors for tensile strength successfully asa unit requires adequate means of gripping the ends of the test specimenwithout causing damage that may result in failure below the actualstrength of the conductor. Various means are available, such
40、as compres-sion sleeves, split sleeves, and preformed grips, but ordinary jaws orclamping devices usually are not suitable.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expr
41、essly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revise
42、d, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may
43、attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United State
44、s. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).3Available from National Technical Information Service (NTIS), 5301 ShawneeRd., Alexandria, VA 22312, http:/www.ntis.gov.B496 143
