ASTM_B_779_-_14.pdf

Designation:B77914Standard Specification forShaped Wire Compact Concentric-Lay-Stranded AluminumConductors,Steel-Reinforced(ACSR/TW)1This standard is issued under the fixed designation B779;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,steel-reinforced(ACSR/TW)and its component wires for use as overheadelectrical conductors(Explanatory Note 1 and Note 2).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.NOTE1ACSR/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 round steel wire(s)surrounded by two or more layers of trapezoidal aluminum 1350-H19wires.Different strandings of the same size of conductor are identified bytype,which is the approximate ratio of steel area to aluminum areaexpressed in percent(Table 1,Table 2 and Table 3).For the purpose of thisspecification,the sizes listed in Table 1 and Table 2 are tabulated on thebasis of the finished conductor having an area or outside diameter equal tothat of specific sizes of standard ACSR so as to facilitate conductorselection.NOTE2The aluminum and temper designations conform to ANSIStandard H 35.1.Aluminum 1350 corresponds to Unified NumberingSystem(UNS)A91350 in accordance with Practice E527.2.Referenced Documents2.1 ASTM Standards:2B230/B230M Specification for Aluminum 1350H19 Wirefor Electrical PurposesB232/B232M Specification for Concentric-Lay-StrandedAluminum Conductors,Coated-Steel Reinforced(ACSR)B263 Test Method for Determination of Cross-SectionalArea of Stranded ConductorsB354 Terminology Relating to Uninsulated Metallic Electri-cal ConductorsB498/B498M Specification for Zinc-Coated(Galvanized)Steel Core Wire for Use in Overhead Electrical Conduc-torsB500/B500M Specification for Metallic Coated or Alumi-num Clad Stranded Steel Core for Use in OverheadElectrical ConductorsB502 Specification for Aluminum-Clad Steel Core Wire forUse in Overhead Electrical Aluminum ConductorsB549 Specification for Concentric-Lay-Stranded AluminumConductors,Aluminum-Clad Steel Reinforced for Use inOverhead Electrical ConductorsB606 Specification for High-Strength Zinc-Coated(Galva-nized)Steel Core Wire for Aluminum and Aluminum-Alloy Conductors,Steel ReinforcedB802/B802M Specification for Zinc5%Aluminum-Mischmetal Alloy-Coated Steel Core Wire for AluminumConductors,Steel Reinforced(ACSR)B803 Specification for High-Strength Zinc5%Aluminum-Mischmetal Alloy-Coated Steel Core Wire for Use inOverhead Electrical ConductorsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE527 Practice for Numbering Metals and Alloys in theUnified Numbering System(UNS)2.2 Other Documents:ANSI H35.1 American National Standard Alloy and TemperDesignation Systems for Aluminum3NBS Handbook 100 Copper Wire Tables of the NationalBureau of Standards43.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 ACSR/TW covered by this specification has five typesof coated core wire and one type of aluminum-clad core wirewhich are designated by abbreviations as follows(ExplanatoryNote 2 and Note 8):3.1.2 ACSR/TW/AW2ACSR/TW using aluminum-cladsteel wire,normal strength(Specification B502).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 April 1,2014.Published April 2014.Originallyapproved in 1987.Last previous edition approved in 2012 as B779 12.DOI:10.1520/B0779-14.2For 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 Technical Information Service(NTIS),5285 PortRoyal Rd.,Springfield,VA 22161,http:/www.ntis.gov.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.3 ACSR/TW/AW3ACSR/TW using aluminum-cladsteel wire,high strength(Specification B502).3.1.4 ACSR/TW/GA2ACSR/TW using Class A zinc-coated steel wire(Specification B498/B498M).3.1.5 ACSR/TW/GC2ACSR/TW using Class C zinc-coated steel wire(Specification B498/B498M).3.1.6 ACSR/TW/GA3ACSR/TW using high-strength,zinc-coated steel wire(Specification