1、Designation: B174 10 (Reapproved 2015)B174 17Standard 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 revisi
2、on, the 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 specificati
3、on covers bare bunch-stranded conductors made from round copper wires, either uncoated or coated with 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 finished diameters and densities substantial
4、ly equal to the respectivediameters and densities of uncoated wires.1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in eachsystem may not be exact equivalents; therefore, each system shall be used independently of the other. C
5、ombining values from thetwo systems may result in non-conformance with the standard.1.3.1 For conductor sizes designated by AWG or kcmil, the requirements in SI units have been numerically converted fromcorresponding values, stated or derived, in inch-pound units. For conductor sizes designated by S
6、I units only, the requirements arestated or derived in SI units.1.4 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendation
7、s issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 The following documents of the issue in effect at the time of reference form a part of this specification to the extentreferenced herein:2.2 ASTM Standards:2B3 Specification for Soft or Ann
8、ealed Copper WireB33 Specification for Tin-Coated Soft or Annealed Copper Wire for Electrical PurposesB172 Specification for Rope-Lay-Stranded Copper Conductors Having Bunch-Stranded Members, for Electrical ConductorsB189 Specification for Lead-Coated and Lead-Alloy-Coated Soft Copper Wire for Elect
9、rical PurposesB193 Test Method for Resistivity of Electrical Conductor MaterialsB263 Test Method for Determination of Cross-Sectional Area of Stranded ConductorsB354 Terminology Relating to Uninsulated Metallic Electrical Conductors2.3 American National Standard:ANSI C42.35 Definitions of Electrical
10、 Terms33. Classification3.1 For the purpose of this specification bunch-stranded conductors are classified as shown in Tables 1 and 2.1 This specification is under the jurisdiction of ASTM Committee B01 on Electrical Conductors and is the direct responsibility of Subcommittee B01.04 on Conductorsof
11、Copper and Copper Alloys.Current edition approved April 1, 2015April 1, 2017. Published April 2015April 2017. Originally approved in 1941. Last previous edition approved in 20102015 as B174 10. 10 (2015). DOI: 10.1520/B0174-10R15.10.1520/B0174-17.2 For referencedASTM standards, visit theASTM website
12、, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http
13、:/www.ansi.org.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 depict all changes accurately, ASTM recommends that users co
14、nsult 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, PA 19428-2959. United States1TABLE 1 A Classification and Cons
15、truction Requirements of Bunch-Stranded ConductorsA Class I Bunch Stranded ConductorsArea ofCross SectionClassification,Size,andMinimumNumberof WiresUncoated Copper Coated CopperSize,AWGClass INominalWireDiameter0.0201 In.(0.511 mm)Nominal dcresistance20CMaximum dcresistance20CNominal dcresistance20
16、CMaximum dcresistance20CNominal dcresistance20CMaximum 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
17、.19 2.2313090 6.63 9 33 0.808 0.824 2.65 2.70 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 3.55TABLE 1 B Classification and Construction Requirements of Bunch-Stranded ConductorsClass J Bunch Stranded ConductorsAArea ofCross SectionClassification,Size,andMinimumNumberof W
18、iresUncoated Copper Coated CopperSize,AWGClass JNominalWireDiameter0.0126 In.(0.320 mm)Nominaldcresistance20CMaximumdcresistance20CNominaldcresistance20CMaximumdcresistance20CNominaldcresistance20CMaximumdcresistance20CNominaldcresistance20CMaximumdcresistance20Ccmil mm 28 AWG ohm/kft ohm/kft ohm/km
19、 ohm/km ohm/kft ohm/kft ohm/km ohm/km10380 5.26 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
20、7.07 22.8 23.21020 0.517 20 7 10.4 10.6 34.0 34.7 11.0 11.2 36.1 36.8TABLE 1 C Classification and Construction Requirements of Bunch-Stranded ConductorsClass K Bunch Stranded ConductorsAArea ofCross SectionClassification,Size,andMinimumNumberof WiresUncoated Copper Coated CopperArea ofCross SectionC
21、lassification,Size,andinimumNumberof WiresUncoated Copper Coated CopperSize,AWGClass KNominalWireDiameter0.0100 In.(0.254 mm)Nominaldcresistance20CMaximumdcresistance20CNominaldcresistance20CMaximumdcresistance20CNominaldcresistance20CMaximumdcresistance20CNominaldcresistance20CMaximumdcresistance20
22、Ccmil 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 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 14.7162
23、0 0.821 18 16 6.53 6.66 21.4 21.9 7.01 7.15 23.0 23.51020 0.517 20 10B 10.4 10.6 34.1 34.8 11.1 11.4 36.4 37.1640 0.324 22 7 16.5 16.9 54.1 55.2 17.7 18.1 58.1 59.2A The constructions shown in these tables are typical of those used in the industry. It is intended that these tables preclude other con
24、structions which may be desirablefor specific applications. The constructions shown provide for a finished stranded conductor approximately of the area indicated. When specified by the purchaser, thenumber or sizes of wire may be increased to provide additional area to compensate for draw-down durin
25、g subsequent processing.BAs an alternate to the construction shown for 20AWG, Class K; for hook-up wire construction may consist of 8 wires 0.0100 in. (0.254 mm) diameter around wire of 0.0142in. (0.361 mm) diameter.B174 1724. Ordering Information4.1 Orders for material under this specification shal
26、l include the 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 3),4.1.4 Whether coated or uncoated; if coated, designate type of coating (see 11.1),4.1.5 Maximum length of lay (see 6.3),4.1.6 Whether
27、 separator is required (see 7.2),4.1.7 Package size (see section 14.1),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 accordance with accepted commercial practice.TABLE 2 Classification and Co
28、nstruction Requirements of Bunch-Stranded ConductorsClass L, M, O, P and Q Bunch StrandedConductorsAArea ofCross SectionClassification,Size, andMinimum Numberof WiresUncoated Copper Coated CopperSize,AWGClass L Class M Class O Class P Class Q Nominaldcresistance20CMaximumdcresistance20CNominaldcresi
29、stance20CMaximumdcresistance20CNominaldcresistance20CMaximumdcresistance20CNominaldcresistance20CMaximumdcresistance20CNominalWireDiameter0.0080 In.(0.511mm)NominalWireDiameter0.0063 In.(0.320mm)NominalWireDiameter0.0050 In.(0.254mm)NominalWireDiameter0.0040 In.(0.320mm)NominalWireDiameter0.0031 In.
30、(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 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
31、 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 10.6 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 . . 2
32、6.2 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 150A The constructions shown in this table are typical of those used in the industry. It is intended that this table preclude other constructions which may be desirable for specificapplications.The construct
33、ions 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 additional area to compensate for draw-down during subsequent processing.TABLE 3 Maximum Length of Lay for Bunch-StrandedC
34、onductorsArea ofCross Section Size,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 6.63 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 63.5
35、06 530 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 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 0.6
36、1 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 1735.2 Joints shall be so constructed and so disposed throughout the conductor that the diameter or configuration of the completedconductor is not substantially affected, and so tha
37、t the flexibility of the completed conductor is not adversely affected.6. Lay6.1 Conductors of the same size and description furnished on one order shall have the same lay.6.2 The direction of lay shall be at the option of the manufacturer unless otherwise specified.6.3 Unless otherwise specified by
38、 the purchaser, the length of lay of bare or coated bunch-stranded conductors shall conformto the requirements of Column B of Table 3.6.4 When specified, for constructions other than those listed in Footnote A of Tables 1 and 2, the length of lay shall conformto the requirements of Column A of Table
39、 3.6.5 Conductors of an intermediate nominal area in circular mils shall conform to the requirements for length of lay of the nextsmaller conductor.7. Construction7.1 The area of cross section, and the number and diameter of wires for a variety of strand constructions in general use areshown in Tabl
40、es 1 and 2.7.2 If a separator is required to be furnished with the conductor, it shall be at the option of the manufacturer unless otherwisespecified by the purchaser as to requirements for the kind and thickness of material and its application details.8. Physical and Electrical Tests8.1 Tests for t
41、he electrical properties of wires composing conductors made from soft or annealed copper wire, bare or coated,shall be made before stranding.8.2 Tests for the physical properties of soft or annealed copper wire, bare or coated, may be made upon the wires beforestranding or upon wires removed from th
42、e completed stranded conductors, but need not be made upon both. Care shall be takento avoid mechanical injury and stretching when removing wires from the conductor for the purpose of testing.8.3 The physical properties of wire when tested before stranding shall conform to the applicable requirement
43、s of 11.1.8.4 The physical properties of wires removed from the completed stranded conductor shall be permitted to vary from theapplicable requirements of 11.1 by the following amounts (Explanatory Note 3):8.4.1 Average of Results Obtained on All Wires TestedThe percent minimum elongation may be red
44、uced by the value of 5 %from the values required for unstranded wires as specified by Specifications B3, B33, or B189, as applicable. For example, wherethe unstranded wire specification requires minimum elongation of 30 %, wire of that material removed from Specification B174stranded conductor shall
45、 meet a minimum elongation value of 25 %, a value 5 % reduction.8.4.2 Results Obtained on Individual WiresThe percent minimum elongation may be reduced by the value of 15 % from thevalues required for unstranded wires as specified by Specifications B3, B33, or B189, as applicable. For example, where
46、 theunstranded wire specification requires minimum elongation of 30 %, wire of that material removed from Specification B174stranded conductor shall meet a minimum elongation value of 15 %. If the reduction results in minimum elongation of less than5 %, a minimum of 5 % shall apply.8.5 In the event
47、that the requirements prescribed in 8.4.2 are met, 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 of morethan 100 wires shall be tested for the purpose of final determ
48、ination of conformance to 8.4.8.6 Elongation tests to determine compliance shall not be made on the conductor as a unit.8.7 If a tinning, lead-coating, or lead-alloy-coating test is required, it shall be made on the wires prior to stranding.9. Density9.1 For the purpose of calculating mass, cross se
49、ctions, etc., the density of copper shall be taken as 8.89 g/cm3 (0.32117 lb/in.3)at 20C (Explanatory Note 4).10. Mass and Resistance10.1 The mass and electrical resistance of a unit length of stranded conductor are a function of the length of lay (ExplanatoryNote 6).10.2 The maximum electrical resistance of a unit length of stranded conductor shall not exceed 2 %over the nominal DCresistance shown in Tables 1 and 2 (Explanatory Note 5). When the DC resistance is measured at other than 20C, it is to becorrected by using the multiplying fac
