1、Designation: B496 13B496 13aStandard 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
2、 revision. 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 round concentric-lay-stranded conductors made from uncoated round copper wiresfor g
3、eneral use for electrical purposes. These conductors shall be constructed with a central core surrounded by one or more layersof helically laid compacted wires (Explanatory Note 1 and Note 2).1.2 The values stated in inch-pound or SI units are to be regarded separately as standard. The values given
4、in each system arenot exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systemsmay result in nonconformance with the specification.parentheses are mathematical conversions to SI units that are provided forinformation only and are not co
5、nsidered standard.1.2.1 For density, resistivity, and temperature, the values stated in SI units are to be regarded as standard.2. Referenced Documents2.1 The following documents of the issue in effect on date of material purchase form a part of this specification to the extentreferenced herein:2.2
6、ASTM Standards:2B3 Specification for Soft or Annealed Copper WireB263 Test Method for Determination of Cross-Sectional Area of Stranded ConductorsB354 Terminology Relating to Uninsulated Metallic Electrical Conductors3. Ordering Information3.1 Orders for material under this specification shall inclu
7、de the following information:3.1.1 Quantity of each size (Table 1),3.1.2 Conductor size; circular-mil area or AWG, (Section 6 and Table 1),3.1.3 Packaging (Section 15), if required,3.1.4 Special package marking, and3.1.5 Place of inspection (Section 14).4. Joints4.1 Welds and brazes may be made in r
8、ods or in wires prior to final drawing.4.2 Welds and brazes may be made in the individual round drawn wires for compact conductors, but shall not be closer togetherthan 1 ft (300 mm) for conductor of 19 wires or less or closer than 1 ft (300 mm) in a layer for conductor of more than 19 wires.4.3 No
9、joint nor splice shall be made in a compact-stranded conductor as a whole.5. Lay5.1 The lay length of every layerthe wires shall be not be less than 8 times nor more than 16 times the outside diameter of thecompleted conductor except that, for sizes 2 AWG finished conductor. The maximum length of la
10、y for compact conductors AWG1 This specification is under the jurisdiction of ASTM Committee B01 on Electrical Conductors and is the direct responsibility of Subcommittee B01.04 on Conductorsof Copper and Copper Alloys.Current edition approved April 1, 2013Oct. 1, 2013. Published April 2013October 2
11、013. Originally approved in 1969. Last previous edition approved in 20102013 asB496 10B496 13.1. DOI: 10.1520/B0496-13.10.1520/B0496-13A.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume in
12、formation, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately
13、 depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, P
14、A 19428-2959. United States12 (33.6 mm2) and smaller, the maximum lay length smaller shall be 17.5 times the outside diameter.diameter of that layer. Forconductors of 37 wires or more, this requirement shall apply to the wires of the outer two layers. The lay of the layers other thanthe outer two la
15、yers shall be at the option of the manufacturer, 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 condu
16、ctors shall be as shown in Table 1.6.2 The starting round copper wires used in the fabrication of the compact round conductor shall be of such diameter as toproduce a finished conductor having a nominal cross-sectional area and diameter as prescribed in Table 1.7. Density7.1 For the purpose of calcu
17、lating linear densities, cross sections, and so forth, the density of the copper shall be taken as 8.89g/cm3 (0.32117 lb/in.3) at 20C.8. Mass and Resistance8.1 The mass per unit length and dc electrical resistance of a compact round conductor are greater than the total of thesecharacteristics of the
18、 compressed wires composing the finished conductor, depending upon the lay. The standard increment of massper unit length and electrical resistance shall be taken as 2 %. The nominal mass per unit length and dc resistance are shown inTable 1. When the dc resistance is measured at other than 20C, it
19、shall be corrected by using the multiplying factors given in Table2.8.2 In cases where the lay is definitely known, the increment may be calculated if desired (Explanatory Note 3).8.3 For conductors to be used in covered or insulated wires or cables, direct current (DC) resistance measurement may be
20、 usedinstead of the method outlined in Section 9, to determine compliance with this specification.9. Variation in Area9.1 The cross-sectional area of the compact round conductor shall be not less than 98 % of the cross-sectional area as specifiedin Column 1 of Table 1.9.2 The manufacturer shall dete
21、rmine the cross-sectional area by Test Method B263. In applying this method, the increment inmass per unit length resulting from stranding may be the applicable value specified in 9.1 or may be calculated from the measureddimensions of the sample under test. In case of question regarding area compli
22、ance, the actual mass per unit length increment dueto stranding shall be calculated.TABLE 1 Construction Requirements of Compact Round Concentric-Lay-Stranded Copper ConductorsConductor Size Number ofWiresCompact Conductor Diameter Mass,lb/1000 ftMass,kg/kmDC Resistance at 20Ccmil AWG mm2 in. mm /10
23、00 ft /km1 000 000 . 507 61A 1.060 26.9 3086 4590 0.0106 0.0347900 000 . 456 61A 0.999 25.4 2780 4140 0.0118 0.0386800 000 . 405 61A 0.938 23.8 2469 3680 0.0132 0.0433750 000 . 380 61A 0.908 23.0 2316 3450 0.0141 0.0462700 000 . 355 61A 0.877 22.3 2160 3220 0.0151 0.0495650 000 . 329 61A 0.845 21.4
24、2006 2990 0.0163 0.0535600 000 . 304 61A 0.813 20.6 1850 2760 0.0176 0.0577550 000 . 279 61A 0.775 19.7 1700 2530 0.0192 0.0630500 000 . 253 37B 0.736 18.7 1542 2300 0.0212 0.0695450 000 . 228 37B 0.700 17.8 1390 2070 0.0235 0.0770400 000 . 203 37B 0.659 16.7 1236 1840 0.0264 0.0865350 000 . 177 37B
25、 0.616 15.7 1080 1610 0.0302 0.0990300 000 . 152 37B 0.570 14.5 925 1380 0.0353 0.116250 000 . 127 37B 0.520 13.2 772 1150 0.0423 0.139211 600 4/0 107 19C 0.475 12.1 653 972 0.0500 0.164167 800 3/0 85.0 19C 0.423 10.8 518 771 0.0630 0.206133 100 2/0 67.4 19C 0.376 9.57 411 611 0.0795 0.261105 600 1/
26、0 53.5 19C 0.336 8.55 326 485 0.100 0.32883 690 1 42.4 19C 0.299 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 0.403 1.3216 510 8 8.37 7 0.134 3.40 51.0 75.9 0.641 2.10A 58 wires minimum.B 35 wi
27、res minimum.C 18 wires minimum.B496 13a210. Variation in Diameter10.1 The average diameter of the compact-round conductor shall not vary by more than +1 % and 2 % from the diameterspecified in Table 1.11. Finish11.1 The conductor surface shall be smooth and free of imperfections not consistent with
28、the best commercial practice.12. Physical and Electrical Tests12.1 Tests for the physical and electrical properties of wires composing the conductors shall be made before stranding inaccordance with Specification B3 (Explanatory Note 4 and Note 5).13. Requirements for Wires13.1 Before stranding and
29、compacting the copper wire shall meet all of the requirements of Specification B3.13.2 Wire shaped before stranding shall meet the requirements of Specification B3, except for diameter tolerance. Theelongation requirement shall be the same as round wires of equal nominal area. The area tolerance for
30、 shaped wires shall be suchthat the finished conductor conforms to Section 10 of this specification.14. Inspection14.1 All tests and inspection shall be made at the place of manufacture unless otherwise especially agreed upon between themanufacturer and the purchaser at the time of purchase. The man
31、ufacturer shall afford the inspector representing the purchaser allreasonable facilities, without charge, to satisfy him that the material is being furnished in accordance with this specification.15. Packaging and Package Marking15.1 Package sizes for conductors shall be agreed upon by the manufactu
32、rer and the purchaser in the placing of individualorders.15.2 The conductors shall be protected against damage in ordinary handling and shipping.15.3 The net mass, length, size, kind of conductor, purchase order number, and any other marks required by the purchase ordershall be marked on a tag attac
33、hed to the end of the conductor inside of the package. The same information, together with themanufacturers serial number (if any) and all shipping marks required by the purchaser, shall appear on the outside of eachpackage.16. Keywords16.1 compact copper conductor; compact round concentric-lay-stra
34、nded copper conductor; concentric-lay-stranded copperconductor; copper electrical conductor; electrical conductor; electrical conductorcopper; stranded copper conductorTABLE 2 Temperature Correction Factors for ConductorResistanceTemperature, C Multiplying Factor for Conversion to20C0 1.0855 1.06310
35、 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 0.82280 0.80985 0.79790 0.784B496 13a3EXPLANATORY NOTESNOTE 1In this specification only compact round concentric-lay-stranded conductor constructions are specifically designated. Constructions no
36、t includedin this specification should be specifically agreed upon between the manufacturer and the purchaser when placing the order.NOTE 2For definitions of terms relating to conductors, reference should be made to Terminology B354.NOTE 3The increment of mass or electrical resistance of a completed
37、 concentric-lay-stranded conductor, k, in percent, is:k 5100m 21!where m is the stranding factor, and is the ratio of the mass or electrical resistance of a unit length of stranded conductor to that of a solid conductorof the same cross-sectional area or of a stranded conductor with infinite length
38、of lay, that is, all wires parallel to the conductor axis. The stranding factorm for the completed stranded conductor is the numerical average of the stranding factors for each of the individual wires in the conductor, including thestraight core wire, if any (for which the stranding factor is unity)
39、. The stranding factor, mind, for any given wire in a concentric-lay-stranded conductoris: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 1003 is based on round wire constructions which are applicable to compacted
40、wireconstructions.NOTE 4Individual wires are not to be unlaid from compact round conductors for testing purposes. The physical properties of the individual compactedwires will be altered by the deformation brought about by compacting, unlaying, and straightening for test.NOTE 5To test stranded condu
41、ctors for tensile strength successfully as a unit requires adequate means of gripping the ends of the test specimen withoutcausing damage that may result in failure below the actual strength of the conductor. Various means are available, such as compression sleeves, splitsleeves, and preformed grips
42、, but ordinary jaws or clamping 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 su
43、ch 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
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45、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
46、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/).3 Available from National Technical Information Service (NTIS), 5301 Shawnee Rd., Alexandria, VA 22312, http:/www.ntis.gov.B496 13a4
