ASTM_B_778_-_19.pdf

Designation:B77819Standard Specification forShaped Wire Compact Concentric-Lay-Stranded AluminumConductors(AAC/TW)1This standard is issued under the fixed designation B778;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 shaped wire compactconcentric-lay-stranded aluminum conductor(AAC/TW)andits component wires for use as overhead electrical conductors(Explanatory Note 1 and Note 2).1.2 The values stated in inch-pound units are to be regardedas the standard with the exception of temperature and resistiv-ity.The SI equivalents of inch-pound units may be approxi-mate.NOTE1AAC/TW is designed to increase the aluminum area for agiven diameter of conductor by the use of trapezoidally shaped wires(TW).The conductors consist of a central core of one round aluminumwire or a seven-strand compact round core surrounded by two or morelayers of trapezoidal aluminum 1350-H19 wires.For the purposes of thisspecification,the sizes listed are tabulated on the basis of the finishedconductor having an area equal to that of specific sizes of standard AAC(Table 1)or in fixed diameter increments(Table 2)so as to facilitateconductor selection.NOTE2The aluminum and temper designations conform to ANSIStandard H 35.1.Aluminum 1350 corresponds to Unified NumberingSystem(UNS)A91350 in accordance with Practice E527.1.3 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 The following documents of the issue in effect on dateof material purchase form a part of this specification to theextent referenced herein.2.2 ASTM Standards:2B230/B230M Specification for Aluminum 1350H19 Wirefor Electrical PurposesB263 Test Method for Determination of Cross-SectionalArea of Stranded ConductorsB354 Terminology Relating to Uninsulated Metallic Electri-cal ConductorsB1006 Specification for Electrical Overhead ConductorCode Word NamesE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE527 Practice for Numbering Metals and Alloys in theUnified Numbering System(UNS)2.3 Other Documents:ANSI H35.1 American National Standard Alloy and TemperDesignation Systems for Aluminum3NBS Handbook 100 Copper Wire Tables43.Ordering Information3.1 Orders for material under this specification shall includethe following information:3.1.1 Quantity of each size,3.1.2 Conductor size:kcmil area and diameter(Table 1 andTable 2),3.1.3 Special tension test,if required(see 8.2),3.1.4 Place of inspection(Section 15),3.1.5 Package size and type(see 15.1),3.1.6 Special package markings,if required(Section 15),and3.1.7 Heavy wood lagging,if required(see 15.3).4.Requirement for Wires4.1 Before stranding,the trapezoidal aluminum wires shallconform to the requirements of Specification B230/B230Mexcept for shape and diameter tolerance.The tensile strengthand elongation requirements of trapezoidal wires shall be thesame as for round wires of equal area.The area tolerances shallbe such that the finished conductor conforms to Section 11.1This specification is under the jurisdiction of ASTM Committee B01 onElectrical Conductors and is the direct responsibility of Subcommittee B01.07 onConductors of Light Metals.Current edition approved March 1,2019.Published March 2019.Originallyapproved in 1987.Last previous edition approved in 2014 as B778 14.DOI:10.1520/B0778-19.2For 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 American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.4Available from National Institute of Standards and Technology(NIST),100Bureau Dr.,Stop 1070,Gaithersburg,MD 20899-1070,http:/www.nist.gov.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 5.Joints5.1 Electric-butt welds,electric-butt cold-upset welds,orcold-pressure welds may be made in the individual aluminumwires during the stranding process.No weld shall occur within50 ft(15 m)of any other weld in the completed