1、Designation: B 174 02 (Reapproved 2007)e1Standard Specification forBunch-Stranded Copper Conductors for ElectricalConductors1This standard is issued under the fixed designation B 174; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision,
2、 the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.e1NOTETable 1 was editorially corre
3、cted in March 2007.1. Scope1.1 This specification covers bare bunch-stranded conduc-tors made from round copper wires, either uncoated or coatedwith tin, lead, or lead-alloy for use as electrical conductors(Explanatory Note 1 and Explanatory Note 2).1.2 Coated wires shall include only those wires wi
4、th fin-ished diameters and densities substantially equal to the respec-tive diameters and densities of uncoated wires.1.3 The values stated in inch-pound or SI units are to beregarded separately as standard. Each system shall be usedindependently of the other. Combining values form the twosystems ma
5、y result in nonconformance with the specification.For conductor sizes designated by AWG or kcmil, the require-ments in SI units have been numerically converted fromcorresponding values, stated or derived, in inch-pound units.For conductor sizes designated by SI units only, the require-ments are stat
6、ed or derived in SI units.2. Referenced Documents2.1 The following documents of the issue in effect at thetime of reference form a part of this specification to the extentreferenced herein:2.2 ASTM Standards:2B3 Specification for Soft or Annealed Copper WireB33 Specification for Tinned Soft or Annea
7、led CopperWire for Electrical PurposesB 172 Specification for Rope-Lay-Stranded Copper Con-ductors Having Bunch-Stranded Members, for ElectricalConductorsB 189 Specification for Lead-Coated and Lead-Alloy-Coated Soft Copper Wire for Electrical PurposesB 263 Test Method for Determination of Cross-Sec
8、tionalArea of Stranded ConductorsB 354 Terminology Relating to Uninsulated Metallic Elec-trical Conductors2.3 American National Standard:ANSI C42.35 Definitions of Electrical Terms33. Classification3.1 For the purpose of this specification bunch-strandedconductors are classified as shown in Table 1.
9、4. Ordering Information4.1 Orders for material under this specification shall includethe following information:4.1.1 Quantity of each size and class,4.1.2 Conductor size: circular-mil area or AWG (see 7.1),4.1.3 Class (Section 3 and Table 2),4.1.4 Whether coated or uncoated; if coated, designate typ
10、eof coating (see 11.1),4.1.5 Maximum length of lay (see 6.3),4.1.6 Whether separator is required (see 7.2),4.1.7 Package size (see section 15.1),4.1.8 Special package marking, if required (Section 14), and4.1.9 Place of inspection (Section 13).5. Joints5.1 Necessary joints in wires shall be made in
11、accordancewith accepted commercial practice.5.2 Joints shall be so constructed and so disposed through-out the conductor that the diameter or configuration of thecompleted conductor is not substantially affected, and so thatthe flexibility of the completed conductor is not adverselyaffected.6. Lay6.
12、1 Conductors of the same size and description furnishedon one order shall have the same lay.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 app
13、roved March 15, 2007. Published April 2007. Originallyapproved in 1941. Last previous edition approved in 2002 as B 174 02.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, re
14、fer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United Sta
15、tes.6.2 The direction of lay shall be at the option of themanufacturer unless otherwise specified.6.3 Unless otherwise specified by the purchaser, the lengthof lay of bare or coated bunch-stranded conductors shallconform to the requirements of Column B of Table 2.6.4 When specified, for construction
16、s other than those listedin Footnote A of Table 2, the length of lay shall conform to therequirements of Column A of Table 2.6.5 Conductors of an intermediate nominal area in circularmils shall conform to the requirements for length of lay of thenext smaller conductor.7. Construction7.1 The area of
17、cross section, and the number and diameterof wires for a variety of strand constructions in general use areshown in Table 1.7.2 If a separator is required to be furnished with theconductor, it shall be at the option of the manufacturer unlessotherwise specified by the purchaser as to requirements fo
18、r thekind and thickness of material and its application details.8. Physical and Electrical Tests8.1 Tests for the electrical properties of wires composingconductors made from soft or annealed copper wire, bare orcoated, shall be made before stranding.8.2 Tests for the physical properties of soft or
19、annealedcopper wire, bare or coated, may be made upon the wiresbefore stranding or upon wires removed from the completedstranded conductors, but need not be made upon both. Careshall be taken to avoid mechanical injury and stretching whenremoving wires from the conductor for the purpose of testing.8
20、.3 The physical properties of wire when tested beforestranding shall conform to the applicable requirements of 11.1.8.4 The physical properties of wires removed from thecompleted stranded conductor shall be permitted to vary fromthe applicable requirements of 11.1 by the following amounts(Explanator
21、y Note 3):8.4.1 Average of Results Obtained on All Wires TestedThepercent minimum elongation may be reduced by the value of5 % from the values required for unstranded wires as specifiedby Specifications B 3, B 33, or B 189, as applicable. Forexample, where the unstranded wire specification requiresm
22、inimum elongation of 30 %, wire of that material removedfrom Specification B 174 stranded conductor shall meet aminimum elongation value of 25 %, a value 5 % reduction.8.4.2 Results Obtained on Individual WiresThe percentminimum elongation may be reduced by the value of 15 %from the values required
23、for unstranded wires as specified bySpecifications B 3, B 33, or B 189, as applicable. For example,where the unstranded wire specification requires minimumTABLE 1 Classification and Construction Requirements of Bunch-Stranded ConductorsAArea ofCross SectionSize,AWGClassification, Size, and Minimum N
24、umber of WiresClass I Class J Class K Class L Class M Class O Class P Class QWireDiameter0.0201 in.(0.511 mm)No. 24 AWGWireDiameter0.0126 in.(0.320 mm)No. 28 AWGWireDiameter0.0100 in.(0.254 mm)No. 30 AWGWireDiameter0.0080 in.(0.203 mm)No. 32 AWGWireDiameter0.0063 in.(0.160 mm)No. 34 AWGWireDiameter0
25、.0050 in.(0.127 mm)No. 36 AWGWireDiameter0.0040 in.(0.102 mm)No. 38 AWGWireDiameter0.0031 in.(0.079 mm)No. 40AWGcmil mm220 820 10.5 7 52 . . . . . . .16 510 8.37 8 41 . . . . . . .13 090 6.63 9 33 . . . . . . .10 380 5.26 10 26 65 104 165 . . . .6 530 3.31 12 . 41 65 104 . . . .4 110 2.08 14 . 26 41
26、 65 104 . . .2 580 1.31 16 . 16 26 41 65 104 165 .1 620 0.821 18 . 10 16 26 41 65 104 1651 020 0.517 20 . 7 10B16 26 41 65 104640 0.324 22 . . 7 . 19 . . .404 0.205 24 . . . 7 . 19 . .253 0.128 26 . . . . 7 . . .159 0.0806 28 . . . . . . . .Editorially corrected.AThe constructions shown in this tabl
27、e are typical of those used in the industry. It is not intended that this table preclude other constructions which may be desirablefor specific applications. The constructions shown provide for a finished, non-covered, stranded conductor approximately of the area indicated. When specified by thepurc
28、haser, the number or size of wires may be increased to provide additional area to compensate for draw-down during subsequent processing.BAs an alternate to the construction shown for No. 20 AWG, Class K; for hook-up wire construction may consist of 8 wires 0.0100 in. (0.254 mm) diameter around 1wire
29、 of 0.0142 in. (0.361 mm) diameter.TABLE 2 Maximum Length of Lay for Bunch-StrandedConductorsArea ofCross SectionSize,AWGMaximum Length of LayNominalDiameterColumnAColumnBcmil mm in. mm in. mm in. mm20 820 10.5 7 0.167 4.24 3.00 76.20 3.00 76.2016 510 8.37 8 0.149 3.78 2.75 69.85 2.75 69.8513 090 6.
30、63 9 0.133 3.38 2.50 63.50 2.50 63.5010 380 5.26 10 0.118 3.00 2.50 63.50 2.50 63.506 530 3.31 12 0.093 2.36 2.00 50.80 2.00 50.804 110 2.08 14 0.074 1.88 2.00 50.80 1.75 44.452 580 1.31 16 0.059 1.50 2.00 50.80 1.50 38.101 620 0.821 18 0.047 1.19 2.00 50.80 1.25 31.751 020 0.517 20 0.037 0.94 2.00
31、50.80 1.00 25.40640 0.324 22 0.030 0.76 1.30 33.02 0.80 20.32404 0.205 24 0.024 0.61 1.20 30.48 0.70 17.78253 0.128 26 0.019 0.48 1.00 25.40 0.60 15.24159 0.0806 28 0.015 0.38 1.00 25.40 0.50 12.70B 174 02 (2007)e12elongation of 30 %, wire of that material removed fromSpecification B 174 stranded co
32、nductor shall meet a minimumelongation value of 15 %. If the reduction results in minimumelongation of less than 5 %, a minimum of 5 % shall apply.8.5 In the event that the requirements prescribed in 8.4.2 aremet, but those prescribed in 8.4.1 are not met, a retest shall bepermitted wherein all wire
33、s of a conductor of 100 wires or less,or 100 wires selected at random throughout a conductor ofmore than 100 wires shall be tested for the purpose of finaldetermination of conformance to 8.4.8.6 Elongation tests to determine compliance shall not bemade on the conductor as a unit.8.7 If a tinning, le
34、ad-coating, or lead-alloy-coating test isrequired, it shall be made on the wires prior to stranding.9. Density9.1 For the purpose of calculating mass, cross sections, etc.,the density of copper shall be taken as 8.89 g/cm3(0.32117lb/in.3) at 20C (Explanatory Note 4).10. Mass and Resistance10.1 The m
35、ass and electrical resistance of a unit length ofstranded conductor are a function of the length of lay. Theapproximate mass and electrical resistance may be determinedusing an increment of 2 %.11. Requirements for Wires11.1 The purchaser shall designate the type of wire and typeof coating, if any,
36、to be used in the conductor.11.1.1 Before stranding, uncoated wire shall meet the re-quirements of Specification B3.11.1.2 Before stranding, tinned wire shall meet the require-ments of Specification B33.11.1.3 Before stranding, lead-coated and lead-alloy coatedwire shall meet the requirements of Spe
37、cification B 189.11.2 These requirements shall not prohibit the manufactureof conductors from uncoated hard-drawn wires which areannealed after stranding.12. Variation in Area12.1 The calculated area of cross-section of a strandedconductor expressed in circular mils shall be the product of thesquare
38、 of the specified diameter in mils of the individual wirestimes the number of wires prescribed.NOTE 1The calculated area of such cables as may incorporate morethan one size of component wires should be the sum of the areas of thedifferent sizes of wires.12.2 The area of cross section of a completed
39、strandedconductor designated as an AWG size shall be not less than98 % of the area indicated in Column 1 of Table 1. The area ofcross section of a completed conductor not designated as anAWG size shall be not less than 98 % of a calculated value asprescribed in 12.1.12.3 The area of cross section of
40、 a conductor shall bedetermined by Test Method B 263. In applying this method, theincrement of linear density resulting from stranding shall be theapplicable value specified in Section 10.13. Inspection13.1 All tests and inspection shall be made at the place ofmanufacture unless otherwise especially
41、 agreed upon betweenthe manufacturer and the purchaser at the time of purchase. Themanufacturer shall afford the inspector representing the pur-chaser all reasonable facilities, to satisfy him that the materialis being furnished in accordance with this specification.14. Packaging and Package Marking
42、14.1 Package size for conductors shall be agreed uponbetween the manufacturer and the purchaser in the placing ofindividual orders.14.2 The conductors shall be protected against damage inordinary handling and shipping.14.3 The net mass, length (or lengths, if more than onelength is included in the p
43、ackage), size, kind of conductor,purchase order number, and any other marks required by thepurchase order shall be marked on a tag attached to the end ofthe conductor inside of the package. The same information,together with the manufacturers serial number (if any) and allshipping marks required by
44、the purchaser, shall appear on theoutside of each package.15. Keywords15.1 bunch-stranded copper conductors; copper electricalconductor; electrical conductor; electrical conductorcopper;stranded copper conductorB 174 02 (2007)e13EXPLANATORY NOTESNOTE 1In this specification only bunch-stranded conduc
45、tors aredesignated. Requirements for rope-lay-stranded conductors constructedwith bunch-stranded members will be found in Specification B 172.NOTE 2For definitions of terms relating to conductors, referenceshould be made to ANSI C42.35 and Terminology B 354.NOTE 3Wires removed from stranded conducto
46、rs and straightened fortests will have altered physical properties due to cold working of thematerial. The reduced elongation requirement for wires removed fromstranded conductors reflects this condition.NOTE 4The density of copper is in accordance with the InternationalAnnealed Copper Standard. The
47、 corresponding value at 0C is 8.90 g/cm3(0.32150 lb/in.3. Density calculations involving coated wire shouldconsider the variation of coated wire density from the density of uncoatedcopper wire. The relative affect of the coating density on the overall wiredensity becomes greater as wire diameters de
48、crease.B 174 02 (2007)e14ASTM 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 such patent rights, and the riskof infring
49、ement 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 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 attend. If you feel that your comments have not received a fair heari
