1、Designation: B779 14Standard 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 E527.2. 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 Str
8、anded 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 Overhea
9、dElectrical 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 Z
10、inc-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 A
11、lloy-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 Sta
12、ndardAlloy 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 co
13、re 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 responsibi
14、lity 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 A
15、STM 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
16、 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 States13.1.3 ACSR/TW/AW3ACSR/TW using aluminum-cladsteel wire, high strength (Speci
17、fication 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 B606).3.1.7 ACSR/TW/MA2A
18、CSR/TW using Class A zinc-5 %aluminum-mischmetal alloy-coated 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 i
19、ncludethe following information:4.1.1 Quantity of each size,4.1.2 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 Zn-5 % -MMalloy coated, Class (A or C) of coating (see 5.2),4.1.5 Special te
20、nsion test, if required (see 9.2),4.1.6 Place of inspection (Section 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 (s
21、eeTerminology B354) shall conform to the requirements ofSpecification 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 finishedconducto
22、r conforms to Section 12.TABLE 1 Construction Requirements for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Coated SteelReinforced Size to Have Area Equal to ACSR, Class AAACSR/TW ConductorSizeSize and Stranding of ACSRwith Equal AreaNumber ofAluminumWiresNumber ofLayersSteel Cor
23、e StrandingMass perUnitLength,Alb/1000 ftRatedStrength,1000 lbBNominalOutsideDiameter, in.kcmil Type kcmil StrandingNumber ofWiresDiameter,in.336.4 6 336.4 18/1 14 2 1 0.1367 365 8.6 0.63477.0 13 477.0 24/7 18 2 7 0.0940 613 17.2 0.78477.0 16 477.0 26/7 18 2 7 0.1053 655 19.4 0.79556.5 13 556.5 24/7
24、 18 2 7 0.1015 715 20.0 0.84556.5 16 556.5 26/7 20 2 7 0.1138 765 22.6 0.85636.0 3 636.0 36/1 27 3 1 0.1329 646 13.5 0.85636.0 13 636.0 24/7 18 2 7 0.1085 816 22.9 0.89636.0 16 636.0 26/7 20 2 7 0.1216 874 25.4 0.91795.0 7 795.0 45/7 17 2 7 0.0886 892 21.0 0.96795.0 10 795.0 22/7 18 2 7 0.1108 975 2
25、5.9 0.98795.0 13 795.0 54/7 20 2 7 0.1213 1021 28.2 0.99795.0 16 795.0 26/7 20 2 7 0.1360 1092 31.8 1.01954.0 5 954.0 42/7 30 3 7 0.0837 1029 23.7 1.05954.0 7 954.0 45/7 32 3 7 0.0971 1075 25.9 1.06954.0 13 954.0 54/7 20 2 7 0.1329 1226 33.5 1.081033.5 5 1033.5 42/7 30 3 7 0.0871 1115 25.7 1.091033.
26、5 7 1033.5 45/7 32 3 7 0.1010 1165 28.1 1.101033.5 13 1033.5 54/7 21 2 7 0.1363 1327 36.3 1.131113.0 5 1113.0 42/7 30 3 7 0.0904 1201 27.5 1.131113.0 7 1113.0 45/7 33 3 7 0.1049 1254 30.3 1.141113.0 13 1113.0 54/19 38 3 19 0.0862 1429 39.1 1.191192.5 5 1192.5 42/7 30 3 7 0.0936 1286 29.5 1.171192.5
27、7 1192.5 45/7 33 3 7 0.1085 1343 32.4 1.181192.5 13 1192.5 54/19 38 3 19 0.0892 1530 41.9 1.221272.0 5 1272.0 42/7 30 3 7 0.0967 1372 31.4 1.201272.0 7 1272.0 45/7 35 3 7 0.1121 1433 34.6 1.221272.0 13 1272.0 54/19 39 3 19 0.0921 1632 44.1 1.261351.5 7 1351.5 45/7 35 3 7 0.1155 1522 36.7 1.261351.5
28、13 1351.5 54/19 39 3 19 0.0949 1734 46.8 1.301431.0 7 1431.0 45/7 36 3 7 0.1189 1613 38.9 1.291431.0 13 1431.0 54/19 39 3 19 0.0977 1836 49.6 1.341590.0 7 1590.0 45/7 36 3 7 0.1253 1792 42.2 1.361590.0 13 1590.0 54/19 42 3 19 0.1030 2040 55.1 1.411780.0 8 1780.0 84/19 37 3 19 0.0874 2063 50.7 1.4521
29、56.0 8 2156.0 84/19 64 4 19 0.0961 2515 61.1 1.61AMass per unit length is based on Class A zinc-coated steel.BRated strengths were calculated in accordance with 9.1 using steel stresses at 1 % for Class A coating in accordance with Specification B498/B498M (1 kip = 1000lbf = 4.448 kN).B779 142TABLE2
30、ConstructionRequirementsforShapedWireCompactConcentric-Lay-StrandedAluminumConductors,CoatedSteelReinforcedSizedtoHaveDiameterEqualtoACSR,ClassAACodeWordAACSR/TWConductorSizeSizeandStrandingofACSRwithEqualDiameterNumberofAluminumWiresNumberofLayersSteelCoreStrandingMassperUnitLength,Clb/1000ftRatedS
31、trength, 1000lbDNominal OutsideDiameter,in.EkcmilBTypekcmilBStrandingNumberofWiresDiameter,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/TW664.816
32、556.526/720270.124491326.60.93Maumee/TW768.213636.024/720270.119598827.70.98Wabash/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/TW966.213795.054/721270.13381
33、24134.01.09Suwannee/TW959.616795.026/722270.1493131837.01.11Cheyenne/TW1168.15954.042/730370.0926126028.91.16Genesee/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.
34、21Yukon/TW1233.6131033.554/7383190.0910158642.91.25Truckee/TW1372.551113.042/730370.1004148133.41.25Mackenzie/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
35、.30Merrimack/TW1433.6131192.554/19393190.0978184049.71.34Platte/TW1569.051272.042/733370.1074169338.21.33Potomac/TW1557.471272.045/736370.1241175541.91.35RioGrande/TW1533.3131272.054/19393190.1012196853.21.38Schuylkill/TW1657.471351.545/736370.1280186844.01.39Pecos/TW1622.0131351.554/19393190.106421
36、0757.51.42PeeDee/TW1758.671431.045/737370.1319198246.71.43James/TW1730.6131431.054/19393190.1075222159.41.47Athabaska/TW1949.671590.045/742370.1392219951.91.50Cumberland/TW1926.9131590.054/19423190.1133247165.31.55Powder/TW2153.881780.084/19644190.0961249861.11.60Santee/TW2627.382156.084/19644190.10
37、62304874.51.76ACodewordsshowninthiscolumnareobtainedfrom“Publication50,CodeWordsforOverheadAluminumElectricalConductors,”bytheAluminumAssociation.Theyareprovidedforinformationonly.BToconvertfromkcmiltomm2area,multiplythekcmilvaluex5.067x10-4.CMassperunitlengthisbasedonClassAzinc-coatedsteel.Toconver
38、ttokg/km,multiplythelb/1000ftvaluex1.4887.DRatedstrengthwascalculatedinaccordancewith9.1usingsteelstressesat1%forClassAcoatinginaccordancewithSpecificationB498/B498M(1kip=1000lbf=4.445kN).EToconvertthediameter(inches)tomm,multiplytheinchvaluex25.4.B779 1435.2 Before stranding, the steel core wire sh
39、all 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 may be m
40、ade 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 wiresof
41、 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 prefer
42、red 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 the ou
43、tside 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.7.7 F
44、or the purpose of this specification the lay factor is thelength of lay of a given layer divided by its outside diameter.8. Construction8.1 The nominal aluminum cross-sectional area, conductortype, the nominal number of aluminum wires, the number oflayers, the number and diameter of the steel core w
45、ire, the massper unit length, the rated strength and the outside diameter ofthe shaped wire compact concentric-lay-stranded aluminumconductors, steel-reinforced, shall be as shown in Tables 1-3.NOTE 3Exception to 8.1. Because the final design of a shaped wirecompact conductor is contingent on severa
46、l factors such as layer diameter,wire width and thickness, etc., the actual configuration of a given size mayvary between manufacturers. This might result in a slight variation in thenumber of wires from that shown in Tables 1-3, and also in the dimensionsof the individual wires (See Table 4).9. Rat
47、ed Strength of Conductor9.1 The rated strength of a conductor, as shown in Tables1-3, shall be taken as the aggregate strength of the aluminumand steel components calculated as follows: The strengthcontribution of the aluminum 1350-H19 wires shall be taken asthe percentage, indicated in Table 5 in a
48、ccordance with thenumber of aluminum layers, of the sum of the wire strengthscalculated from the specified diameter of the round wireshaving the same area as the trapezoidal wires used in themanufacture of the conductor, and the appropriate minimumaverage tensile strength given in Specification B230
49、/B230M.The strength contribution of the steel core wires shall be takenas the percentage, indicated in Table 5, of the sum of thestrengths of the steel wires calculated from their specifiednominal wire diameter and the appropriate specified minimumstress at 1 % extension given in Specifications B498/B498M,B502, B606, B802/B802M,orB803, whichever is applicable.9.1.1 The rated strengths of conductors calculated in accor-dance with 9.1 and 9.3, using ClassAzinc-coated steel wires inaccordance with Specification B498/B498M, are listed in Table1 and Table 2.9.2 Tests t
