ASTM_B_857_-_14.pdf

Designation:B85714Standard Specification forShaped Wire Compact Concentric-Lay-Stranded AluminumConductors,Coated-Steel Supported(ACSS/TW)1This standard is issued under the fixed designation B857;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 conductors,steel supported(ACSS/TW)for use as overhead electrical conductors(seeExplanatory Note 1).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 ExceptionsFor conductor sizes designated by AWGor kcmil sizes,the requirements in SI units are numericallyconverted from the corresponding requirements in inch-poundunits.For conductor sizes designated by SI units only,therequirements are stated or derived in SI units.For density,resistivity,and temperature,the values stated in SI units are tobe regarded as standard.1.3 ACSS/TW is designed to increase the aluminum area fora given diameter of conductor by the use of trapezoidal shapedwires(TW),or to reduce the diameter for a given area ofaluminum.The conductors consist of a central core of roundsteel wire(s)surrounded by two or more layers of trapezoidalaluminum 1350-0 wires.Different strandings of the same sizeof conductor are identified by type,which is the approximateratio of steel area to aluminum area expressed in percent(seeTable 1,Table 2,and Table 3).For the purpose of thisspecification,the sizes listed in Table 1 and Table 2 aretabulated on the basis of the finished conductor having an areaor outside diameter equal to that of specified sizes of standardACSR,ACSS,and ACSR/TW so as to facilitate conductorselection.2.Referenced Documents2.1 The following documents of the issue in effect on dateof material purchase form part of this specification to the extentreferenced herein:2.2 ASTM Standards:2B263 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 ReinforcedB609/B609M Specification for Aluminum 1350 RoundWire,Annealed and Intermediate Tempers,for ElectricalPurposesB802/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 ConductorsB856 Specification for Concentric-Lay-Stranded AluminumConductors,Coated Steel Supported(ACSS)B957 Specification for Extra-High-Strength and Ultra-High-Strength Zinc-Coated(Galvanized)Steel Core Wire forOverhead Electrical ConductorsB958 Specification for Extra-High-Strength and Ultra-High-Strength Class A Zinc5%Aluminum-Mischmetal Alloy-Coated Steel Core Wire for Use in Overhead ElectricalConductorsE29 Practice for Using Significant Digits in Test Data to1This 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 1995.Last previous edition approved in 2011 as B857 112.DOI:10.1520/B0857-14.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 TABLE 1 Construction Requirements for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors,Coated Steel SupportedANOTE1Sized to have area equal aluminum cross-sectional area to an ACSR or ACSS,Class AA conductor.ACSS/TWConductor SizeCode WordBSize and Strandingof ACSSwith Equal AluminumCross-Sectional AreaAluminumStrandingSteel CoreStrandingNominal MassACSS/TWACSS/TW Conductor Rated Strength(by type of steel core wire)NominalOutsideDiameterkcmilCTypekcmilStrandingNumberofAluminumWiresNumberofLay