1、Designation:B73813Standard Specification forFine-Wire Bunch-Stranded and Rope-Lay Bunch-StrandedCopper Conductors for Use as Electrical Conductors1This standard is issued under the fixed designation B738;the number immediately following the designation indicates the year oforiginal adoption or,in th
2、e case of revision,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.1.Scope1.1 This specification covers bare bunch-stranded and rope-lay bunch-stranded conductors made fr
3、om round copper wiresfiner than No.40 AWG with diameters less than 0.0031 in.(.078 mm),either coated or uncoated with tin or silver,for useas electrical conductors.(Explanatory Note 1).1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathema
4、ticalconversions to SI units that are provided for information onlyand are not considered standard.1.2.1 ExceptionsThe SI values for density and tempera-ture are to be regarded as standard.2.Referenced Documents2.1 ASTM Standards:2B33 Specification for Tin-Coated Soft or Annealed CopperWire for Elec
5、trical PurposesB49 Specification for Copper Rod Drawing Stock for Elec-trical PurposesB172 Specification for Rope-Lay-Stranded Copper Conduc-tors Having Bunch-Stranded Members,for Electrical Con-ductorsB174 Specification for Bunch-Stranded Copper Conductorsfor Electrical ConductorsB193 Test Method f
6、or Resistivity of Electrical ConductorMaterialsB258 Specification for Nominal Diameters and Cross-SectionalAreas ofAWG Sizes of Solid Round Wires Usedas Electrical ConductorsB298 Specification for Silver-Coated Soft or Annealed Cop-per WireB354 Terminology Relating to Uninsulated Metallic Electri-ca
7、l Conductors3.Classification3.1 For the purposes of this specification,the followingclassifications have been assigned(Explanatory Note 2):3.1.1 Type:3.1.1.1 Type BBunch-stranded conductors.3.1.1.2 Type RRope-lay bunch-stranded conductors.3.1.2 Class:3.1.2.1 Class RStranded conductors using wire 42
8、AWG(0.0025).3.1.2.2 Class SStranded conductors using wire 44 AWG(0.0020).3.1.2.3 Class TStranded conductors using wire 46 AWG(0.00157).3.1.2.4 Class UStranded conductors using wire 48 AWG(0.00124).3.1.2.5 Class VStranded conductors using wire 50 AWG(0.00099).3.2 Detailed information on Type B Conduc
9、tors is found inTable 1 and Table 2.Detailed information on Type R Conduc-tors is found in Table 3 and Table 2.4.Ordering Information4.1 Orders for materials under this specification shall in-clude the following information:4.1.1 Quantity of each size,class,and type,4.1.2 Conductor sizecircular-mil
10、area,dc resistance(7.1)or AWG(5.2.1),4.1.3 Class and type(Section 3),4.1.4 Whether coated or uncoated;if coated,designate typeof coating(6.1);if silver coated,the minimum thickness ofsilver(6.1.2),and whether tarnish protection is desired(11.3),4.1.5 Maximum length of lay(5.2.4),if required,4.1.6 Te
11、mper(6.2),4.1.7 Separators,if required(5.2.2),4.1.8 Package size(11.1),4.1.9 Special package marking,if required(Section 10),and4.1.10 Place of inspection(Section 9).4.2 In addition,Supplementary Requirements shall applyonly when specified by the purchaser in the inquiry,contract,orpurchase order fo
12、r direct procurement by agencies of the U.S.Government.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 approved April 1,2013.Published April 20
13、13.Originallyapproved in 1984.Last previous edition approved in 2008 as B738 03(2008).DOI:10.1520/B0738-13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards
14、Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.Materials and Manufacture5.1 The material shall be copper of such quality and puritythat the finished product shall have the properties and charac-
15、teristics described in this specification.Material meeting therequirements of Specification B49 is such a material.5.2 Construction:5.2.1 Cross-Sectional AreaThe cross-sectional area,number,and diameter of wires for a variety of strand construc-tions in general use are shown in Table 2.5.2.2 Separat
16、orsIf a separator is required to be furnishedwith the conductor,it shall be specified by the purchaser at thetime of the order as to the requirements for the kind andthickness of material and its application details.5.2.3 Joints:5.2.3.1 Necessary joints in wires shall be made in accor-dance with accepted commercial practice.5.2.3.2 Joints shall be so constructed and so disposedthroughout the conductor that the diameter or configuration ofthe completed conductor is not substantially affected,and
