1、Designation: B496 16Standard 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 length of lay of the outer layer shall not be less than8 nor more than 16 times the outside diameter of the completedconductor. The maximum len
9、gth of lay for compact conductorsAWG 2 (33.6 mm2) and smaller shall be 17.5 times the outsidediameter of the conductor.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 com
10、pact round concentric-lay-stranded conductors shall be as shown in Table 1.6.2 The starting 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.
11、7. Density7.1 For the purpose of calculating linear densities, crosssections, and so forth, the density of the copper shall be takenas 8.89 g/cm3(0.32117 lb/in.3) at 20C.8. Mass and Resistance8.1 The mass per unit length and dc electrical resistance ofa compact round conductor are greater than the t
12、otal of thesecharacteristics of the compressed wires composing the finished1This 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 April 1, 20
13、16. Published May 2016. Originallyapproved in 1969. Last previous edition approved in 2014 as B496 14. DOI:10.1520/B0496-16.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, r
14、efer 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 States1conductor, depending upon the lay. The standard increment ofmass per unit length and electrical resistance shall be taken a
15、s2 %. The nominal mass per unit length and dc resistance areshown in Table 1. When 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 (Explana
16、tory Note 3).8.3 For conductors to be used in covered or insulated wiresor cables, 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 c
17、onductorshall be not less than 98 % of the cross-sectional area asspecified in Column 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 speci
18、fied in 9.1 or may be calculatedfrom the measured dimensions of the sample under test. 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 no
19、t vary by more than +1 % and 2 % from the diameterspecified in Table 1.TABLE 1 Construction Requirements of Compact Round Concentric-Lay-Stranded Copper ConductorsConductor SizeNumber ofWiresNominal Compact ConductorDiameterNominal Mass,lb/1000 ftNominal Mass,kg/kmNominal DC Resistance at20Ccmil AWG
20、 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 . 456 61C0.999 25.4 2780 4140 0.0118 0.0386800 0
21、00 . 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 000 . 279 61C0.775 19.7 1700 2530 0.0192 0.063
22、0500 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 0.116250 000 . 127 37D0.520 13.2 772 1150 0.0423 0.
23、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 360 2 33.6 7 0.268 6.81 205 305 0.159 0.52141
24、 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 58 wire construction of the appropriate wire
25、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 0.89555 0.87960 0.86465 0.85070 0.83675 0.822
26、80 0.80985 0.79790 0.784B496 16211. Finish11.1 The conductor surface shall be smooth and free ofimperfections not consistent with the best commercial practice.12. Physical and Electrical Tests12.1 Tests for the physical and electrical properties of wirescomposing the conductors shall be made before
27、stranding inaccordance with Specification B3 (Explanatory Note 4 andNote 5).13. Requirements 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
28、for diameter tolerance. Theelongation requirement shall be the same as round wires 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 ofm
29、anufacture unless otherwise especially agreed upon betweenthe manufacturer and the 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 wit
30、h thisspecification.15. Packaging and Package Marking15.1 Package sizes for conductors 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,
31、kind of conductor, purchaseorder number, and any other marks required by the purchaseorder 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
32、, shall appear on theoutside of each package.16. Keywords16.1 compact copper conductor; compact round concentric-lay-stranded copper conductor; concentric-lay-stranded copperconductor; copper electrical conductor; electrical conductor;electrical conductorcopper; stranded copper conductorEXPLANATORY
33、NOTESNOTE 1In this specification only compact round concentric-lay-stranded conductor 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
34、 of terms relating to conductors, referenceshould be made to Terminology B354.NOTE 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
35、 a unit length of stranded conductor to that of a solidconductor of the same cross-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 strand
36、ing factors for each of the individual wires in theconductor, including the straight 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 p
37、ath of the wire.The derivation of the above as given in NBS Handbook 1003is basedon 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 individualcom
38、pacted wires will be altered by the deformation brought about bycompacting, unlaying, 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 fai
39、lure below the actualstrength of the conductor. Various means are available, such 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 c
40、onnection with any item mentionedin this standard. Users of this standard are expressly 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 resp
41、onsible technical committee and must be reviewed every five years andif not revised, 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 carefu
42、l consideration at a meeting of theresponsible technical committee, which you may 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,
43、 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. 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 AST
44、M website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ from National Technical Information Service (NTIS), 5301 ShawneeRd., Alexandria, VA 22312, http:/www.ntis.gov.B496 163
