ASTM_B_470_-_02_2017.pdf

Designation:B47002(Reapproved 2017)Standard Specification forBonded Copper Conductors for Use in Hookup Wires forElectronic Equipment1This standard is issued under the fixed designation B470;the number immediately following the designation indicates the year oforiginal adoption or,in the 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 stranded uninsulated bare,tin,or tin-lead alloy coated copper conductors in which wires in thestrand are metallically bonded together by the application ofheat or additional tin,or tin-lead alloy for use in hookup wirefor electronic equipment.1.2 The SI values for density and resistivity are to beregarded as standard.For all other properties,the inch-poundvalues are to be regarded as the standard and the SI units maybe approximate.1.3 The hazard caveat pertains only to Section 6 of thisspecification.This standard does not purport to address all ofthe safety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.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 WireB286 Specification for Copper Conductors for Use inHookup Wire for Electronic Equipment3.Ordering Information3.1 Orders for material under this specification shall includethe following information:3.1.1 Quantity of each size,material,construction,and type(see 4.1),3.1.2 Package size(see 8.1),3.1.3 Special package marking if required(Section 8),and3.1.4 Place of inspection(Section 7).4.Conductor Constructions4.1 Conductor constructions shall conform to the applicableconstructions of Specification B286,except that in addition thefollowing bondings may be specified:4.1.1 Type IBare copper,stranded,light bonding,4.1.2 Type IITin or tin-lead alloy coated copper,stranded,light bonding,or4.1.3 Type IIITin or tin-lead alloy coated copper,stranded,heavy bonding.5.General Requirements5.1 The conductors shall consist of tinned copper conform-ing to the product description,quality and specification re-quirements of Specification B286 and bare copper conformingto the product description,quality and specification require-ments of Specification B3.5.2 Flex LifeThe average of six flex tests specified in 6.1shall meet the minimum requirements of Table 1for theapplicable type and construction.5.3 Fraying,Types I and IIAfter performing the test in6.2,no separations of strands shall be visible to the unaided eye(normal spectacles excepted),from the cut end to the point ofbend nearest to that cut end.5.4 Mandrel Test,Type III Only(see Explanatory Note1)After performing the test specified in 6.3 no separation ofstrands shall be visible to the unaided eye(normal spectaclesexcepted).6.Test Methods6.1 Flex LifeThe testing equipment shall be designed andset up for operation so that steel mandrels shall be horizontaland so positioned that any vertical movement of the specimen1This 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 1,2017.Published April 2017.Originallyapproved in 1968.Last previous edition approved in 2012 as B470 02(2012).DOI:10.1520/B0470-02R17.2For 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 Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 is minimized.The conductor as clamped for test shall passthrough the vertical center line between the mandrels.6.1.1 The conductor shall be bent repeatedly in alternatingdirections in an arc of 60 on both sides of the vertical centerline of the mandrels,at a rate of 24 to 36 cpm,betweenmandrels of size and spacing specified in Table 2.Themandrels must