1、Designation: B 496 04Standard Specification forCompact Round Concentric-Lay-Stranded CopperConductors1This standard is issued under the fixed designation B 496; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revis
2、ion. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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
3、 use 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 or SI units are to beregarded separately as standard. The values in each system
4、arenot exact equivalents; therefore, each system shall be usedindependently of the other. Combining values from the twosystems may result in nonconformance with the specification.1.2.1 For density, resistivity, and temperature, the valuesstated in SI units are to be regarded as standard.2. Reference
5、d Documents2.1 The following documents of the issue in effect on dateof material purchase form a part of this specification to theextent referenced herein:2.2 ASTM Standards:2B 3 Specification for Soft or Annealed Copper WireB 263 Test Method for Determination of Cross-SectionalArea of Stranded Cond
6、uctorsB 354 Terminology Relating to Uninsulated Metallic Elec-trical Conductors3. Ordering 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
7、.1.3 Packaging (Section 14), if required,3.1.4 Special package marking, and3.1.5 Place of inspection (Section 16).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
8、not be closertogether than 1 ft (300 mm) for conductor of 19 wires or lessor closer than 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 shall be not less than 8 nor more than16 ti
9、mes the outside diameter of the completed 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 compact round concentric-lay-stranded conductors shall be as shown in
10、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 1.7. Density7.1 For the purpose of calculating linear densities, cros
11、ssections, 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 total of thesecharacteristics of the compressed wires composing the
12、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 are1This specification is under the jurisdiction of ASTM Committee B01 onElectrical Conductors and is the direct
13、 responsibility of Subcommittee B01.04 onConductors of Copper and Copper Alloys.Current edition approved April 1, 2004. Published April 2004. Originallyapproved in 1969. Last previous edition approved in 2001 as B 496 01.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact
14、 ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.shown in Table 1. When th
15、e 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, di
16、rect 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 Column
17、 1 of Table 1.9.2 The manufacturer shall determine the cross-sectionalarea by Test Method B 263. 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 tes
18、t. 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. Finish11.
19、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 stranding inaccordance with Specification B 3
20、 (Explanatory Note 4 andNote 5).13. Requirements for Wires13.1 Before stranding and compacting the copper wire shallmeet all of the requirements of Specification B 3.13.2 Wire shaped before stranding shall meet the require-ments of Specification B 3, except for diameter tolerance. Theelongation requ
21、irement 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.TABLE 1 Construction Requirements of Compact Round Concentric-Lay-Stranded Copper ConductorsConductor SizeNumber ofW
22、iresCompact Conductor DiameterMass,lb/1000 ftMass,kg/kmDC Resistance at 20Ccmil AWG mm2in. mm V/1000 ft V/km1 000 000 . 507 61A1.060 26.9 3086 4590 0.0106 0.0347900 000 . 456 61A0.999 25.4 2780 4140 0.0118 0.0386800 000 . 405 61A0.938 23.8 2469 3680 0.0132 0.0433750 000 . 380 61A0.908 23.0 2316 3450
23、 0.0141 0.0462700 000 . 355 61A0.877 22.3 2160 3220 0.0151 0.0495650 000 . 329 61A0.845 21.4 2006 2990 0.0163 0.0535600 000 . 304 61A0.813 20.6 1850 2760 0.0176 0.0577550 000 . 279 61A0.775 19.7 1700 2530 0.0192 0.0630500 000 . 253 37B0.736 18.7 1542 2300 0.0212 0.0695450 000 . 228 37B0.700 17.8 139
24、0 2070 0.0235 0.0770400 000 . 203 37B0.659 16.7 1236 1840 0.0264 0.0865350 000 . 177 37B0.616 15.7 1080 1610 0.0302 0.0990300 000 . 152 37B0.570 14.5 925 1380 0.0353 0.116250 000 . 127 37B0.520 13.2 772 1150 0.0423 0.139211 600 4/0 107 19C0.475 12.1 653 972 0.0500 0.164167 800 3/0 85.0 19C0.423 10.8
25、 518 771 0.0630 0.206133 100 2/0 67.4 19C0.376 9.57 411 611 0.0795 0.261105 600 1/0 53.5 19C0.336 8.55 326 485 0.100 0.32883 690 1 42.4 19C0.299 7.60 259 385 0.126 0.41366 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 0.4
26、03 1.3216 510 8 8.37 7 0.134 3.40 51.0 75.9 0.641 2.10A58 wires minimum.B35 wires minimum.C18 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 0.91
27、150 0.89555 0.87960 0.86465 0.85070 0.83675 0.82280 0.80985 0.79790 0.784B49604214. Inspection14.1 All tests and inspection shall be made at the place ofmanufacture unless otherwise especially agreed upon betweenthe manufacturer and the purchaser at the time of purchase. Themanufacturer shall afford
28、 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 conductors shall be agreed upon bythe manufacturer and the purchaser i
29、n 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 purchaseorder shall be marked on a tag attached to the end of thecond
30、uctor 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 conductor; compact round concentric-lay-stranded copper conductor; co
31、ncentric-lay-stranded copperconductor; copper electrical conductor; electrical conductor;electrical conductorcopper; stranded copper conductorEXPLANATORY NOTESNOTE 1In this specification only compact round concentric-lay-stranded conductor constructions are specifically designated. Construc-tions no
32、t 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 B 354.NOTE 3The increment of mass or electrical resistance of a completed
33、concentric-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-sectional area or of a stranded conductor withinfinite length
34、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 straight core wire, if any (for which the strandingfactor is unity).
35、The stranding factor, mind, for any given wire in aconcentric-lay-stranded conductor is:mind5 = 1 1 9.8696/n2!where n = (length of lay)/diameter of helical path of the wire.The derivation of the above as given in NBS Handbook 1003is based onround wire constructions which are applicable to compacted
36、wire con-structions.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, unlaying, and straightening for test.NOTE 5To test stranded condu
37、ctors for tensile strength successfullyas a 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 as compres-sion sleeves, split sleeves, and preformed grips
38、, 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 expressly advised that determination of the validity of any suc
39、h 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 revised, either reapproved or withdrawn. Your comments are invite
40、d 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 attend. If you feel that your comments have not received a
41、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 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 ASTM website(www.astm.org).3Available from the National Technical Information Service, 5285 Port RoyalRoad, Springfield, VA 22161.B496043
