1、Designation: B174 10 (Reapproved 2015)Standard Specification forBunch-Stranded Copper Conductors for ElectricalConductors1This standard is issued under the fixed designation B174; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、 year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope1.1 This specification cove
3、rs 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 with fin-ished diameters and densities substantially equ
4、al to the respec-tive diameters and densities of uncoated wires.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independently of the other. Combini
5、ngvalues from the two systems may result in non-conformancewith the standard.1.3.1 For conductor sizes designated by AWG or kcmil, therequirements in SI units have been numerically converted fromcorresponding values, stated or derived, in inch-pound units.For conductor sizes designated by SI units o
6、nly, the require-ments are stated 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 Specifi
7、cation for Tin-Coated Soft or Annealed CopperWire for Electrical PurposesB172 Specification for Rope-Lay-Stranded Copper Conduc-tors Having Bunch-Stranded Members, for Electrical Con-ductorsB189 Specification for Lead-Coated and Lead-Alloy-CoatedSoft Copper Wire for Electrical PurposesB193 Test Meth
8、od for Resistivity of Electrical ConductorMaterialsB263 Test Method for Determination of Cross-SectionalArea of Stranded ConductorsB354 Terminology Relating to Uninsulated Metallic Electri-cal Conductors2.3 American National Standard:ANSI C42.35 Definitions of Electrical Terms33. Classification3.1 F
9、or the purpose of this specification bunch-strandedconductors are classified as shown in Tables 1 and 2.4. 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
10、(see 7.1),4.1.3 Class (Section 3 and Table 3),4.1.4 Whether coated or uncoated; if coated, designate typeof 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 14.1),4.1.8 Special package marking, if required (Section
11、 14), and4.1.9 Place of inspection (Section 13).5. Joints5.1 Necessary joints in wires shall be made in 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 substan
12、tially affected, and so thatthe flexibility of the completed conductor is not adverselyaffected.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
13、 approved April 1, 2015. Published April 2015. Originallyapproved in 1941. Last previous edition approved in 2010 as B174 10. DOI:10.1520/B0174-10R15.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStand
14、ards volume information, refer 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.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken,
15、 PA 19428-2959. United States16. Lay6.1 Conductors of the same size and description furnishedon one order shall have the same lay.6.2 The direction of lay shall be at the option of themanufacturer unless otherwise specified.TABLE 1 A Classification and Construction Requirements of Bunch-Stranded Con
16、ductorsAClass I Bunch Stranded ConductorsArea ofCross SectionClassification,Size,andMinimumNumberof WiresUncoated Copper Coated CopperSize,AWGClass INominalWireDiameter0.0201 In.(0.511 mm)Nominal dcresistance20CMaximum dcresistance20CNominal dcresistance20CMaximum dcresistance20CNominal dcresistance
17、20CMaximum dcresistance20CNominal dcresistance20CMaximum dcresistance20Ccmil mm 24 AWG ohm/kft ohm/kft ohm/km ohm/km ohm/kft ohm/kft ohm/km ohm/km20820 10.5 7 52 0.508 0.518 1.67 1.70 0.528 0.539 1.73 1.7716510 8.37 8 41 0.641 0.654 2.10 2.14 0.666 0.679 2.19 2.2313090 6.63 9 33 0.808 0.824 2.65 2.7
18、0 0.840 0.857 2.76 2.8110380 5.26 10 26 1.02 1.04 3.34 3.41 1.06 1.08 3.48 3.55TABLE1BClassification and Construction Requirements of Bunch-Stranded ConductorsClass J Bunch Stranded ConductorsAArea ofCross SectionClassification,Size,andMinimumNumberof WiresUncoated Copper Coated CopperSize,AWGClass
19、JNominalWireDiameter0.0126 In.(0.320 mm)Nominaldcresistance20CMaximumdcresistance20CNominaldcresistance20CMaximumdcresistance20CNominaldcresistance20CMaximumdcresistance20CNominaldcresistance20CMaximumdcresistance20Ccmil mm 28 AWG ohm/kft ohm/kft ohm/km ohm/km ohm/kft ohm/kft ohm/km ohm/km10380 5.26
20、 10 65 1.02 1.04 3.34 3.41 1.08 1.10 3.54 3.616530 3.31 12 41 1.62 1.65 5.31 5.42 1.72 1.75 5.64 5.764110 2.08 14 26 2.57 2.62 8.44 8.61 2.73 2.79 8.96 9.142580 1.31 16 16 4.10 4.18 13.5 13.7 4.35 4.44 14.3 14.61620 0.821 18 10 6.53 6.66 21.4 21.9 6.94 7.07 22.8 23.21020 0.517 20 7 10.4 10.6 34.0 34
21、.7 11.0 11.2 36.1 36.8TABLE1CClassification and Construction Requirements of Bunch-Stranded ConductorsClass K Bunch Stranded ConductorsAArea ofCross SectionClassification,Size,andMinimumNumberof WiresUncoated Copper Coated CopperSize,AWGClass KNominalWireDiameter0.0100 In.(0.254 mm)Nominaldcresistan
22、ce20CMaximumdcresistance20CNominaldcresistance20CMaximumdcresistance20CNominaldcresistance20CMaximumdcresistance20CNominaldcresistance20CMaximumdcresistance20Ccmil mm 30 AWG ohm/kft ohm/kft ohm/km ohm/km ohm/kft ohm/kft ohm/km ohm/km10380 5.26 10 104 1.02 1.04 3.35 3.41 1.09 1.12 3.58 3.656530 3.31
23、12 65 1.62 1.65 5.31 5.42 1.74 1.77 5.71 5.824110 2.08 14 41 2.57 2.62 8.43 8.60 2.76 2.82 9.06 9.242580 1.31 16 26 4.10 4.18 13.5 13.7 4.40 4.49 14.4 14.71620 0.821 18 16 6.53 6.66 21.4 21.9 7.01 7.15 23.0 23.51020 0.517 20 10B10.4 10.6 34.1 34.8 11.1 11.4 36.4 37.1640 0.324 22 7 16.5 16.9 54.1 55.
24、2 17.7 18.1 58.1 59.2AThe constructions shown in these tables are typical of those used in the industry. It is intended that these tables preclude other constructions which may be desirablefor specific applications. The constructions shown provide for a finished stranded conductor approximately of t
25、he area indicated. When specified by the purchaser, thenumber or sizes of wire may be increased to provide additional area to compensate for draw-down during subsequent processing.BAs an alternate to the construction shown for 20AWG, Class K; for hook-up wire construction may consist of 8 wires 0.01
26、00 in. (0.254 mm) diameter around wire of 0.0142in. (0.361 mm) diameter.B174 10 (2015)26.3 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 3.6.4 When specified, for constructions other tha
27、n those listedin Footnote A of Tables 1 and 2, the length of lay shall conformto the requirements of Column A of Table 3.6.5 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 cros
28、s section, and the number and diameterof wires for a variety of strand constructions in general use areshown in Tables 1 and 2.7.2 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
29、 for 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
30、or 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 testin
31、g.8.3 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(Explana
32、tory 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 B3, B33,orB189, as applicable. Forexample, where the unstranded wire specification requiresmin
33、imum elongation of 30 %, wire of that material removedfrom Specification B174 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 for
34、 unstranded wires as specified bySpecifications B3, B33,orB189, as applicable. For example,TABLE 2 Classification and Construction Requirements of Bunch-Stranded ConductorsClass L, M, O, P and Q Bunch StrandedConductorsAArea ofCross SectionClassification,Size, andMinimum Numberof WiresUncoated Coppe
35、r Coated CopperSize,AWGClass L Class M Class O Class P Class Q Nominaldcresistance20CMaximumdcresistance20CNominaldcresistance20CMaximumdcresistance20CNominaldcresistance20CMaximumdcresistance20CNominaldcresistance20CMaximumdcresistance20CNominalWireDiameter0.0080 In.(0.511mm)NominalWireDiameter0.00
36、63 In.(0.320mm)NominalWireDiameter0.0050 In.(0.254mm)NominalWireDiameter0.0040 In.(0.320mm)NominalWireDiameter0.0031 In.(0.254mm)cmil mm 32 AWG 34 AWG 36 AWG 38 AWG 40 AWG ohm/kft ohm/kft ohm/km ohm/km ohm/kft ohm/kft ohm/km ohm/km10380 5.26 10 165 . . . . 1.02 1.04 3.34 3.41 1.09 1.12 3.58 3.656530
37、 3.31 12 104 . . . . 1.62 1.65 5.31 5.42 1.74 1.77 5.71 5.824110 2.08 14 65 104 . . . 2.57 2.62 8.43 8.60 2.76 2.82 9.06 9.242580 1.31 16 41 65 104 165 . 4.10 4.18 13.5 13.7 4.40 4.49 14.4 14.71620 0.821 18 26 41 65 104 165 6.53 6.66 21.4 21.9 7.00 7.15 23.0 23.41020 0.517 20 16 26 41 65 104 10.4 10
38、.6 34.1 34.8 11.1 11.4 36.4 37.1640 0.324 22 . 19 . . . 16.5 16.9 54.1 55.2 17.7 18.1 58.1 59.2404 0.205 24 7 . 19 . . 26.2 26.7 86.0 87.7 28.1 28.7 92.2 94.0253 0.128 26 . 7 . . . 41.8 42.6 137 140 44.9 45.8 147 150AThe constructions shown in this table are typical of those used in the industry. It
39、 is intended that this table preclude other constructions which may be desirable for specificapplications. The constructions shown provide for a finished stranded conductor approximately of the area indicated. When specified by the purchaser, the number or sizesof wire may be increased to provide ad
40、ditional area to compensate for draw-down during subsequent processing.TABLE 3 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
41、 3.78 2.75 69.85 2.75 69.8513 090 6.63 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
42、31.751 020 0.517 20 0.037 0.94 2.00 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 12.70B174 10 (2015)3where the unstranded wire specification requires min
43、imumelongation of 30 %, wire of that material removed fromSpecification B174 stranded conductor 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
44、, but those prescribed in 8.4.1 are not met, a retest shall bepermitted wherein all wires 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
45、to determine compliance shall not bemade on the conductor as a unit.8.7 If a tinning, lead-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
46、8.89 g/cm3(0.32117lb/in.3) at 20C (Explanatory Note 4).10. Mass and Resistance10.1 The mass and electrical resistance of a unit length ofstranded conductor are a function of the length of lay (Explana-tory Note 6).10.2 The maximum electrical resistance of a unit length ofstranded conductor shall not
47、 exceed 2 %over the nominal DCresistance shown in Tables 1 and 2 (Explanatory Note 5). Whenthe DC resistance is measured at other than 20C, it is to becorrected by using the multiplying factor given in Table 4.10.3 For conductors to be used in covered or insulated wiresor cables, direct current (DC)
48、 resistance measurements shall beused instead of the method outlined in Section 12, to determinecompliance with this specification.11. Requirements for Wires11.1 The purchaser shall designate the type of wire and typeof coating, if any, to be used in the conductor.11.1.1 Before stranding, uncoated w
49、ire 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 Specification B189.11.2 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 of the sp
