ASTM_B_47_-_95a_2017.pdf

Designation:B4795a(Reapproved 2017)Standard Specification forCopper Trolley Wire1This standard is issued under the fixed designation B47;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers round and grooved hard-drawncopper and silver-bearing copper trolley wire.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 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 ASTM Standards:2B49 Specification for Copper Rod for Electrical PurposesB193 Test Method for Resistivity of Electrical ConductorMaterials3.Ordering Information3.1 Orders for material under this specification shall includethe following information:3.1.1 Quantity of each size and section,3.1.2 Wire size:diameter in inches(see 6.1 and Table 1)orarea in circular mils(see 10.1 and Fig.1),3.1.3 Shape of section(Section 1),3.1.4 Type of copper,if the addition of silver of 25 troyoz./short ton minimum,is required(see Section 4 and Explana-tory Note 1),3.1.5 Package size(see 18.3),3.1.6 Lagging,if required(see 18.1),3.1.7 Relation between vertical axis of grooved wire andaxis of reel(see 18.1),3.1.8 Size of arbor hole,if special(see 18.2),3.1.9 Special package marking,if required(see 18.4),and3.1.10 Place of inspection(Section 16).4.Materials and Manufacture4.1 The material shall be copper of such quality and puritythat the finished product shall have the properties and charac-teristics prescribed in this specification.NOTE1Specification B49 defines the materials suitable for use.4.2 Copper redraw rod of special qualities,forms,or types,as may be agreed upon between the manufacturer and thepurchaser,and that will conform to the requirements prescribedin this specification may also be used.4.3 Either oxygen-free or tough pitch copper may be sup-plied.Tests for oxygen content of the copper are not arequirement of this specification.ROUND WIRE5.Tensile Properties5.1 Round wire shall conform to the requirements as totensile properties specified in Table 1.5.2 Tests on a specimen of round wire containing a jointshall show at least 95%of the tensile strength specified inTable 1.Elongation tests shall not be made on specimenscontaining joints.5.3 Tension tests shall be made on representative samples.The elongation shall be determined as the permanent increasein length,due to the breaking of the wire in tension,measuredbetween gage marks placed originally 10 in.apart upon the testspecimen(Explanatory Note 2).The fracture shall be betweenthe gage marks and not closer than 1 in.to either gage mark.6.Dimensions and Permissible Variations6.1 The size of round trolley wire shall be expressed as thediameter of the wire in decimal fractions of an inch,to thenearest 0.1 mil(0.0001 in.).6.2 Wire shall be truly cylindrical in form.The diametershall not vary more than plus and minus 1%from thatspecified.1This specification is under the jurisdiction of ASTM Committee B01 onElectrical Conductors and is the direct responsibility of B01.04 on Conductors ofCopper and Copper Alloys.Current edition approved April 1,2017.April 2017.Originally approved in 1923to replace portions of B1.Last previous edition approved in 2012 as B47 95a(2012).DOI:10.1520/B0047-95AR17.2For 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 7.Twist Test7.1 For the purpose of determining and developing defectswhich may be prejudicial to the life of trolley wire,owing to itspeculiar service as compared to that of wire for other purposes,round wire shall be subjected to the twist test described in 7.2.Round wire that does not withstand at least 9 twists withoutbreaking shall not be considered satisfactory.7.2 Three twist tests shall be made on specimens 10 in.(254mm)in length between the holders of t