ASTM_B_246_-_15.pdf

Designation:B24615Standard Specification forTinned Hard-Drawn and Medium-Hard-Drawn Copper Wirefor Electrical Purposes1This standard is issued under the fixed designation B246;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This specification covers tinned hard-drawn andmedium-hard-drawn round copper wire for electrical purposes.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.1.2.1 ExceptionFor density,resistivity and temperature,the values stated in SI units are to be regarded as standard.1.3 This standard does not purport to address all of thesafety 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.For hazardstatement,see Sections 10 and 13.2.Referenced Documents2.1 The following documents of the issue in effect on thedate of material purchase form a part of this specification to theextent referenced herein:2.2 ASTM Standards:2B5 Specification for High Conductivity Tough-Pitch CopperRefinery ShapesB49 Specification for Copper Rod Drawing Stock for Elec-trical PurposesB170 Specification for Oxygen-Free Electrolytic CopperRefinery ShapesB193 Test Method for Resistivity of Electrical ConductorMaterials2.3 National Bureau of Standards:3NBS Handbook 100Copper Wire Tables3.Ordering Information3.1 Orders for material under this specification shall includethe following information:3.1.1 Quantity of each size,3.1.2 Wire size,diameter in inches(see 5.1 and Table 1),3.1.3 Type of copper,if special(see 4.2),3.1.4 Temper(see 7.1 and Table 1),3.1.5 Package size(see 18.1),3.1.6 Special package marking,if required,and3.1.7 Place of inspection(Section 16).4.Materials4.1 The tinned wire shall be made by coating hard-drawnand medium-hard-drawn copper wire with commercially puretin(see Note 1).For purposes of this specification,the tin shallbe considered commercially pure if the total of other elements,exclusive of copper,does not exceed 1%.Notwithstanding theprevious sentence,chemical analysis of the tin coating or of thetin used for coating shall not be required under this specifica-tion.Adequacy of the tin coating is ensured by the continuityof coating and adherence of coating requirements(Sections 9and 13,respectively).4.2 The copper 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 copper suitable for use.4.3 Copper bars of special qualities,forms,or types,as maybe agreed upon between the manufacturer and the purchaser,and which will conform to the requirements prescribed in thisspecification may also be used.5.Dimensions,Mass,and Permissible Variations5.1 The wire sizes shall be expressed as the diameter of thecoated wire in decimal fractions of an inch to the nearest0.0001 in.(0.001 mm)(Explanatory Note 5).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 1,2015.Published April 2015.Originallyapproved in 1951.Last previous edition approved in 2010 as B246 05(2010).DOI:10.1520/B0246-15.2For 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.3Available from National Technical Information Service(NTIS),5301 ShawneeRd.,Alexandria,VA 22312,http:/www.ntis.gov.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.2 The coated wire shall not vary from the specifieddiameter by more than+3%or 1%.5.3 Ten percent,but not less than five coils or spools(or all,if the lot is less than five)from any lot of wire shall be takennear each end and one near the middle.If any of these selectedcoils or spools fails to conform to the requirements prescribedin 5.2,all coils or spools shall be gaged in the mannerspecified.6.Workmanship,Finish,and Appearance6.1 The tin coating shall consist of a smooth continuouslayer,firmly adhering to the surface of the copper.6.2 The wire shall be free from all imperfections notconsistent with the best commercial practice.7.Tensile Properties7.1 The tinned wire shall conform to the requirements as totensile properties pre