1、Designation: B779 18Standard 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 o
2、f 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
3、-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 onl
4、yand are not considered standard.NOTE 1ACSR/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-H19wire
5、s. 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 th
6、e finished conductor having an area or outside diameter equal tothat of specific sizes of standard ACSR so as to facilitate conductorselection.NOTE 2The aluminum and temper designations conform to ANSIStandard H 35.1. Aluminum 1350 corresponds to Unified NumberingSystem (UNS) A91350 in accordance wi
7、th 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 Tec
8、hnicalBarriers to Trade (TBT) Committee.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 Cro
9、ss-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
10、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 Specificat
11、ion 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
12、% Aluminum-Mischmetal Alloy-Coated Steel Core Wire for Use inOverhead Electrical 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 Allo
13、ys in theUnified Numbering System (UNS)2.2 Other Documents:ANSI H35.1 American National StandardAlloy and TemperDesignation Systems for Aluminum3NBS Handbook 100 Copper Wire Tables of the NationalBureau of Standards41This specification is under the jurisdiction of ASTM Committee B01 onElectrical Con
14、ductors and is the direct responsibility of Subcommittee B01.07 onConductors of Light Metals.Current edition approved March 1, 2018. Published March 2018. Originallyapproved in 1987. Last previous edition approved in 2014 as B779 14. DOI:10.1520/B0779-18.2For referenced ASTM standards, visit the AST
15、M 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
16、, 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 StatesThis international standard was developed
17、 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.1TABLE1ConstructionRequi
18、rementsforShapedWireCompactConcentric-Lay-StrandedAluminumConductors,CoatedSteelReinforcedSizetoHaveAreaEqualtoACSR,ClassAACodeWordAACSR/TWConductorSizeSizeandStrandingofACSRwithEqualAreaNumberofAluminumWiresNumberofLayersSteelCoreStrandingMassperUnitLength,Blb/1000ftRatedStrength, 1000lbCNominal Ou
19、tsideDiameter,Ein.kcmilDTypekcmilStrandingNumberofWiresDiameter,in.MerlinTW336.46336.418/114210.13673658.60.63FlickerTW477.013477.024/718270.094061317.20.78HawkTW477.016477.026/718270.105365519.40.79ParakeetTW556.513556.524/718270.101571520.00.84DoveTW556.516556.526/720270.113876522.60.85KingbirdTW6
20、36.03636.036/127310.132964613.50.85RookTW636.013636.024/718270.108581622.90.89GrosbeakTW636.016636.026/720270.121687425.40.91TernTW795.07795.045/717270.088689221.00.96PuffinFTW795.010F795.022/718270.1108F97525.90.98CondorTW795.013795.054/720270.1213102128.20.99DrakeTW795.016795.026/720270.1360109231
21、.81.01PhoenixTW954.05954.042/730370.0837102923.71.05RailTW954.07954.045/732370.0971107525.91.06CardinalTW954.013954.054/720270.1329122633.51.08SnowbirdTW1033.551033.542/730370.0871111525.71.09OrtolanTW1033.571033.545/732370.1010116528.11.10CurlewTW1033.5131033.554/721270.1383132736.31.13AvocetTW1113
22、.051113.042/730370.0904120127.51.13BluejayTW1113.071113.045/733370.1049125430.31.14FinchTW1113.0131113.054/19383190.0862142939.11.19OxbirdTW1192.551192.542/730370.0936128629.51.17BuntingTW1192.571192.545/733370.1085134332.41.18GrackleTW1192.5131192.554/19383190.0892153041.91.22ScissortailTW1272.0512
23、72.042/730370.0967137231.41.20BitternTW1272.071272.045/735370.1121143334.61.22PheasantTW1272.0131272.054/19393190.0921163244.11.26DipperTW1351.571351.545/735370.1155152236.71.26MartinTW1351.5131351.554/19393190.0949173446.81.30BobolinkTW1431.071431.045/736370.1189161338.91.29PloverTW1431.0131431.054
24、/19393190.0977183649.61.34LapwingTW1590.071590.045/736370.1253179242.21.36FalconTW1590.0131590.054/19423190.1030204055.11.41ChukarTW1780.081780.084/19373190.0874206350.71.45BluebirdTW2156.082156.084/19644190.0961251561.11.61ACodewordsshowninthiscolumnareobtainedfromSpecificationB1006.Theyareprovided
25、forinformationonly.BMassperunitlengthisbasedonClassAzinc-coatedsteel.Toconverttokg/km,multiplythelb/1000ftvalue1.4887.CRatedstrengthswerecalculatedinaccordancewith9.1usingsteelstressesat1%forClassAcoatinginaccordancewithSpecificationB498/B498M(1kip=1000lbf=4.448kN).DToconvertthediameter(inches)tomm,
26、multiplytheinchvalue25.4.EToconvertfromkcmiltomm2area,multiplythekcmilvalue5.06710-4.FFor795kcmilType10(PuffinACSRTW)conductortheindicated0.1108in.steelwiresizedoesnotcorrespondwiththeconcentricroundwire795kcmil22/7PuffinACSRconductor.Theroundwireconstructionutilizesa0.1056”diametersteelcorewire.The
27、industryaccepteddimensionforthePuffinACSRTWsteelwireis0.1108in.TechnicallythisrenderstheconstructionasaType11conductor.Theconductormass,ratedstrengthanddiametervaluescorrespondtothe0.1108in.diametersteelcore.B779 182TABLE2ConstructionRequirementsforShapedWireCompactConcentric-Lay-StrandedAluminumCon
28、ductors,CoatedSteelReinforcedSizedtoHaveDiameterEqualtoACSR,ClassAACodeWordAACSR/TWConductorSizeSizeandStrandingofACSRwithEqualDiameterNumberofAluminumWiresNumberofLayersSteelCoreStrandingMassperUnitLength,Clb/1000ftRatedStrength, 1000lbDNominal OutsideDiameter,in.EkcmilBTypekcmilBStrandingNumberofW
29、iresDiameter,in.EMonongahela/TW405.16336.418/114210.152044110.20.68Mohawk/TW571.713477.024/718270.103073520.60.85Calumet/TW565.316477.026/720270.114677622.90.86Mystic/TW666.613556.524/720270.111185624.00.91Oswego/TW664.816556.526/720270.124491326.60.93Maumee/TW768.213636.024/720270.119598827.70.98Wa
30、bash/TW762.816636.026/720270.1331104730.50.99Nechako/TW768.93636.036/127310.152078516.40.93Kettle/TW957.27795.045/732370.0973107926.01.06Fraser/TW946.710795.022/735370.1154114229.61.08Columbia/TW966.213795.054/721270.1338124134.01.09Suwannee/TW959.616795.026/722270.1493131837.01.11Cheyenne/TW1168.15
31、954.042/730370.0926126028.91.16Genesee/TW1158.07954.045/733370.1078130831.61.17Hudson/TW1158.413954.054/725270.1467148939.61.20Catawba/TW1272.051033.542/730370.0967137231.41.20Nelson/TW1257.171033.545/735370.1115141734.21.21Yukon/TW1233.6131033.554/7383190.0910158642.91.25Truckee/TW1372.551113.042/7
32、30370.1004148133.41.25Mackenzie/TW1359.771113.045/736370.1159153036.91.26Thames/TW1334.6131113.054/19393190.0944171346.31.29St.Croix/TW1467.851192.542/733370.1041158535.81.29Miramichi/TW1455.371192.545/736370.1200164039.21.30Merrimack/TW1433.6131192.554/19393190.0978184049.71.34Platte/TW1569.051272.
33、042/733370.1074169338.21.33Potomac/TW1557.471272.045/736370.1241175541.91.35RioGrande/TW1533.3131272.054/19393190.1012196853.21.38Schuylkill/TW1657.471351.545/736370.1280186844.01.39Pecos/TW1622.0131351.554/19393190.1064210757.51.42PeeDee/TW1758.671431.045/737370.1319198246.71.43James/TW1730.6131431
34、.054/19393190.1075222159.41.47Athabaska/TW1949.671590.045/742370.1392219951.91.50Cumberland/TW1926.9131590.054/19423190.1133247165.31.55Powder/TW2153.881780.084/19644190.0961249861.11.60Santee/TW2627.382156.084/19644190.1062304874.51.76ACodewordsshowninthiscolumnareobtainedfromSpecificationB1006.The
35、yareprovidedforinformationonly.BToconvertfromkcmiltomm2area,multiplythekcmilvaluex5.067x10-4.CMassperunitlengthisbasedonClassAzinc-coatedsteel.Toconverttokg/km,multiplythelb/1000ftvaluex1.4887.DRatedstrengthwascalculatedinaccordancewith9.1usingsteelstressesat1%forClassAcoatinginaccordancewithSpecifi
36、cationB498/B498M(1kip=1000lbf=4.445kN).EToconvertthediameter(inches)tomm,multiplytheinchvaluex25.4.B779 1833. 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 d
37、esignated by abbreviations as follows (ExplanatoryNote 2 and Note 8):3.1.2 ACSR/TW/AW2ACSR/TW using aluminum-cladsteel wire, normal strength (Specification B502).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-coa
38、ted 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 B606).3.1.7 ACSR/TW/MA2ACSR/TW using Class A zinc-5 %aluminum-mischmetal alloy-coated
39、steel core wire (Specifica-tion B802/B802M).3.1.8 ACSR/TW/MA3ACSR/TW using high-strengthzinc-5 % mischmetal alloy-coated steel core wire (Specifica-tion B803).4. Ordering Information4.1 Orders for material under this specification shall includethe following information:4.1.1 Quantity of each size,4.
40、1.2 Conductor size: kcmil area and diameter,4.1.3 Conductor type and number of wires, aluminum andsteel (Tables 1-3),4.1.4 Type of steel core wire and if zinc or Zen % -MMalloy coated, Class (A or C) of coating (see 5.2),4.1.5 Special tension test, if required (see 9.2),4.1.6 Place of inspection (Se
41、ction 15),4.1.7 Package size and type (see 16.1),4.1.8 Special package markings, if required (Section 16),and4.1.9 Heavy wood lagging, if required (see 16.3).5. Requirement for Wires5.1 Before stranding, the trapezoidal aluminum wires (seeTerminology B354) shall conform to the requirements ofSpecifi
42、cation B230/B230M except for shape and diametertolerance. The tensile strength and elongation requirements oftrapezoidal wires shall be the same as for round wires of equalarea. The area tolerances shall be such that the finishedconductor conforms to Section 12.5.2 Before stranding, the steel core w
43、ire shall meet therequirements of Specifications B498/B498M, B502, B606,B802/B802M,orB803, whichever is applicable.5.3 Following stranding, the steel core shall meet therequirements of Specification B500/B500M.6. Joints6.1 Electric-butt welds, electric-butt cold-upset welds, orcold-pressure welds ma
44、y 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 conductor(Explanatory Note 3).6.2 There shall be no joints made in the finished steel wires.7. Lay7.1 The preferred lay of the outside layer of aluminum w
45、iresof shaped wire compact aluminum conductors, steel-reinforced, having a steel core of 7 or 19 wires and havingmultiple layers of aluminum wires, is 11 times the outsidediameter of the conductor but the lay shall not be less than 10nor more than 13 times that diameter (Explanatory Note 4).7.2 The
46、preferred lay of the layer immediately beneath theoutside layer of aluminum wires is 13 times the outsidediameter of such layer but the lay shall be not less than 10 normore than 16 times that diameter.7.3 The lay of the inner layers of aluminum wires shall benot less than 10 nor more than 17 times
47、the outside diameter ofsuch layer.7.4 The preferred lay of the steel core shall be as set forth bySpecification B500/B500M.7.5 The direction of lay of the outside layer of aluminumwires shall be right-hand.7.6 The direction of lay of the aluminum and steel wiresshall be reversed in successive layers
48、.7.7 For the purpose of this specification the lay factor is thelength of lay of a given layer divided by its outside diameter.7.8 In a conductor having multiple layers of aluminumwires, the lay ratio of any aluminum layer shall not be greaterthan the lay ratio of the aluminum layer immediately bene
49、athit. Similarly, in a conductor having multiple layers of steelwires in the core, the lay ratio of a steel layer shall not begreater than the lay ratio of the steel layer immediately beneathit.8. Construction8.1 The nominal aluminum cross-sectional area, conductortype, the nominal number of aluminum wires, the number ofTABLE 3 Construction Requirements for Shaped Wire Compact Concentric-Lay Stranded Aluminum Conductors Coated, SteelReinforcedACSR/TW ConductorSizeNumber ofAluminum WiresNumberof LayersSteel Core StrandingMass per UnitLength, lb/1000 ftRated Stre
