1、Designation: B549 18Standard Specification forConcentric-Lay-Stranded Aluminum Conductors, Aluminum-Clad Steel Reinforced for Use in Overhead ElectricalConductors1This standard is issued under the fixed designation B549; the number immediately following the designation indicates the year oforiginal
2、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 concentric-lay-stranded con-ductors made f
3、rom round aluminum 1350-H19 (extra hard)aluminum wires and round aluminum-clad steel core wires foruse as overhead electrical conductors (Explanatory Note 1 andNote 2).1.2 The SI values of density and resistivity are to beregarded as standard. For all other properties the inch-poundunits are regarde
4、d as standard and the SI units may beapproximate.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
5、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 135
6、0H19 Wirefor Electrical PurposesB263 Test Method for Determination of Cross-SectionalArea of Stranded ConductorsB354 Terminology Relating to Uninsulated Metallic Electri-cal ConductorsB500/B500M Specification for Metallic Coated or Alumi-num Clad Stranded Steel Core for Use in OverheadElectrical Con
7、ductorsB502 Specification for Aluminum-Clad Steel Core Wire forUse in Overhead Electrical Aluminum ConductorsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications2.3 ANSI Standards:3ANSI C 42.100 Dictionary of Electrical and ElectronicsTermsANSI H 35.1 Am
8、erican National Standard Alloy and Tem-per Designation Systems for Aluminum2.4 Other Standard:NBS Handbook 100Copper Wire Tables of the NationalBureau of Standards43. Terminology3.1 Description of Terms Specific to This Standard3.1.1 ACSR covered by this specification has one type ofsteel core wire
9、which is designated by the following abbrevia-tion (Explanatory Note 2):3.1.1.1 ACSR/AWACSR using aluminum-clad steel wire(Explanatory Note 2).4. Classification4.1 For the purpose of this specification, conductors areclassified as follows (Explanatory Note 1 and Note 2):4.1.1 Class AAFor bare conduc
10、tors usually used in over-head lines. These conductors are used as follows:4.1.1.1 Conductors used for regular overhead line construc-tion and4.1.1.2 Conductors having a high ratio of mechanicalstrength to current-carrying capacity used for overhead groundwires and for extra-long span construction.4
11、.1.2 Class AFor conductors to be covered with weather-resistant (weatherproof) materials.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,
12、2018. Published March 2018. Originallyapproved in 1971. Last previous edition approved in 2013 as B549 13. DOI:10.1520/B0549-18.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume informatio
13、n, 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), 5301 ShawneeRd., Alexandria, VA 22312, http
14、:/www.ntis.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 theDevel
15、opment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.15. Ordering Information5.1 Orders for material under this specification shall includethe following information:5.1.1 Quantity of each size, stranding, and
16、 class,5.1.2 Conductor size: circular mil area or AWG of alumi-num wires (Section 9 and Table 1),5.1.3 Number of wires, aluminum, and aluminum-clad steel(Table 1),5.1.4 Direction of lay of outer layer of aluminum wires ifother than right-hand (see 8.2),5.1.5 Special tests, if required (see 15.3 and
17、15.5),5.1.6 Package size (see 17.1 and Explanatory Note 5),5.1.7 Special package marking, if required (Section 17),5.1.8 Lagging, if required (see 17.3), and5.1.9 Place of inspection (Section 16).6. Requirement for Wires6.1 Before stranding, the aluminum wires used shall meetall the requirements of
18、Specification B230/B230M.6.2 Before stranding, the aluminum-clad steel core wiresused shall meet all the requirements of Specification B502.7. Joints7.1 Electric-butt welds, cold-pressure welds, or electric-butt, cold-upset welds in the finished individual aluminumwires composing the conductor may b
19、e made during thestranding process. No weld shall occur within 50 ft (15 m) ofa weld in the same wire or in any other wire of the completedconductor (Explanatory Note 1).7.2 There shall be no joints of any kind made in the finishedaluminum-clad steel wires.8. Lay8.1 The length of lay of the various
20、layers of aluminumwires in a conductor shall conform to Table 2 (ExplanatoryNote 5). The length of lay of the various layers of aluminum-clad steel wires shall conform to Specification B500/B500M.The length of lay of the varous layers of mixed aluminum andaluminum-clad steel wires (AWAC) shall confo
21、rm to Table 2.8.2 The direction of lay of the outside layer of wires shall beright hand unless otherwise specified in the purchase order. Thedirection of lay of the aluminum and aluminum-clad steel wiresshall be reversed in successive layers.8.3 In a conductor having multiple layers of aluminumwires
22、, the lay ratio of any aluminum layer shall not be greaterthan the lay ratio of the aluminum layer immediately beneathit. Similarly, in a conductor having multiple layers of alumi-num clad steel wires in the core, the lay ratio of an aluminumclad steel layer shall not be greater than the lay ratio o
23、f thealuminum clad steel layer immediately beneath it.9. Construction9.1 The number and diameter of aluminum and steel wiresand the areas of cross section of aluminum wires shall conformto the requirements prescribed in Table 1 and Fig. 1.9.2 Where compressed stranding is required in order toinsulat
24、e the conductor properly, one or more aluminum layersof any stranded conductor consisting of 7 wires or more may beslightly compressed, thereby reducing the outside diameter ofthe conductor by not more than 3 %, provided that the area ofcross section after compressing is in accordance with Section13
25、.10. Rated Strength of Conductor10.1 The rated strength of a completed conductor shall betaken as the aggregate strength of the aluminum andaluminum-clad steel components, calculated as follows. Thestrength contribution of the aluminum wires shall be taken asthe percentage, according to the number o
26、f layers of aluminumwires, indicated in Table 3, of the sum of the strengths of the1350-H19 wires, calculated from their specified nominal wirediameter and the appropriate specified minimum averagetensile strength given in Specification B230/B230M. Thestrength contribution of the aluminum-clad steel
27、 core wiresshall be taken as the percentage according to the number oflayers of aluminum-clad steel wires, indicated in Table 3,ofthesum of the strengths of the aluminum-clad steel wires, calcu-lated from their specified nominal wire diameter and theappropriate specified minimum stress at 1 % extens
28、ion given inSpecification B502.10.2 Rated strength and breaking strength values shall berounded to three significant figures, in the final value only, inaccordance with the rounding method of Practice E29.11. Density11.1 For the purpose of calculating mass, cross sections,etc., the density of alumin
29、um 1350 shall be taken as 2705kg/m3(0.0975 lb/in.3) at 20C (68F) (Explanatory Note 6).11.2 For the purpose of calculating mass, cross sections,etc., the density of aluminum-clad steel wire shall be taken as6590 kg/m3(0.2381 lb/in.3) at 20C (68F).12. Mass and Electrical Resistance12.1 The mass and el
30、ectrical resistance of a unit length ofstranded conductor are a function of the length of lay. Theapproximate mass and electrical resistance may be determinedusing the standard increments shown in Table 4. When greateraccuracy is desired, the increment based on the specific lay ofthe conductor may b
31、e calculated (Explanatory Note 7).12.2 In the calculation of the electrical resistance of acompleted conductor, the resistivity of the aluminum-clad steelcore wire shall be taken as 0.08480mm2/m (51.01cmil/ft)at 20C (68F).13. Variation in Area13.1 The area of cross section of the aluminum wires of a
32、conductor shall be not less than 98 % of the area specified.Unless otherwise specified by the purchaser, the manufacturermay have the option of determining the cross-sectional area byeither of the following methods, except that in case of questionregarding area compliance, the method in 13.1.2 shall
33、 be used:13.1.1 The area of cross section may be determined bycalculations from diameter measurements, expressed to fourdecimal places, of the component aluminum wires at any pointwhen measured perpendicularly to their axes.B549 182TABLE1ConstructionRequirementsofConcentric-Lay-StrandedAluminumCondu
34、ctors,Aluminum-CladSteelReinforcedACodeNameBConductorSizeClassCStrandingConductorRatedStrengthConductorMassperUnitLengthCross-sectionalAreaUsingOnlyAluminumStrandWiresApproximateCross-sectionalAreaIncludingNominalAluminumAreainAWStrandWiresDAluminumAluminum-CladSteelNum-berofWiresNominalDiameterNum-
35、berofWiresNominalDiameter(1000lbf)kNlb/1000ftkg/kmcmilmm2cmilmm2in.mmin.mmThrasher/AW2312000117123243001178AA760.17444.43190.08142.0755.324624723679Kiwi/AW2167000109821761001103AA720.17354.4170.11572.9449.121822623366Bluebird/AW2156000109221731001101AA840.16024.07190.09612.4459.026224373627Chukar/AW
36、17800009021795200910AA840.14563.70190.08742.2249.422020132996Falcon/AW15900008061609800816AA540.17164.36190.10302.6253.023619602917Lapwing/AW15900008061601200811AA450.18804.7870.12533.1841.818617462598Parrot/AW15105007651528200774AA540.16724.25190.10032.5550.322418602768Nuthatch/AW151050076515205007
37、70AA450.18324.6570.12213.1039.717716582467Plover/AW14310007251448900734AA540.16284.14190.09772.4847.721217642625Bobolink/AW14310007251440200730AA450.17834.5370.11893.0237.616715702336Martin/AW13515006851367700693AA540.15824.02190.09492.4145.120116652478Dipper/AW13515006851360100689AA450.17334.4070.1
38、1552.9335.515814832207Pheasant/AW12720006451287700652AA540.15353.90190.09212.3442.418915682333Bittern/AW12720006451280600649AA450.16814.2770.11212.8533.414913962078Skylark/AW12720006451275400646AA360.18804.7810.18804.7825.711412721893Grackle/AW11925006041206700611AA540.14863.77190.08922.2740.2179147
39、02188Bunting/AW11925006041201000609AA450.16284.1470.10852.7631.313913091948Finch/AW11130005641127800571AA540.14363.65190.08622.1937.516713732043Bluejay/AW11130005641120500568AA450.15734.0070.10492.6629.313012221819Curlew/AW10335005241046100530AA540.13833.5170.13833.5135.615812741896Ortolan/AW1033500
40、5241040000527AA450.15153.8570.10102.5727.112111341688Tanager/AW10335005241035800525AA360.16944.3010.16944.3021.19410331537Cardinal/AW954000483966100490AA540.13293.3870.13293.3832.914611771752Rail/AW954000483960400487AA450.14563.7070.09712.4725.411310471558Catbrid/AW954000483956600485AA360.16284.1410
41、.16284.1419.5879541420Canary/AW900000456911400462AA540.12913.2870.12913.2831.013811111653Ruddy/AW900000456906100459AA450.14143.5970.09432.4024.01079881470Mallary/AW795000403812700412AA300.16284.14190.09772.4837.116511601726Condor/AW795000403805000408AA540.12133.0870.12133.0827.81249801458Tern/AW7950
42、00403800400406AA450.13293.3870.08862.2521.5968721298Drake/AW795000403807600409AA260.17494.4470.13603.4530.513610411549Cuckoo/AW795000403805000408AA240.18204.6270.12133.0827.51229811460Coot/AW795000403797200404AA360.14863.7710.14863.7716.6747951183Redwing/AW715500363730900370AA300.15443.92190.09262.3
43、533.414910431552Starling/AW715500363727400369AA260.16594.2170.12903.2827.51229361393Stilt/AW715500363725000367AA240.17274.3970.11512.9224.81108831314Gannet/AW666600338676600343AA260.16014.0770.12453.1626.01168721298Flamingo/AW666600338675400342AA240.16674.2370.11112.8223.11038231225Egret/AW636000322
44、650200329AA300.14563.70190.08742.2229.91339281381Sooter/AW636000322650500330AA300.14563.7070.14563.7029.31309351391Grosbeak/AW636000322646100327AA260.15643.9770.12163.0924.81108321238Rook/AW636000322644000326AA240.16284.1470.10852.7622.0987851168B549 183TABLE1ContinuedCodeNameBConductorSizeClassCStr
45、andingConductorRatedStrengthConductorMassperUnitLengthCross-sectionalAreaUsingOnlyAluminumStrandWiresApproximateCross-sectionalAreaIncludingNominalAluminumAreainAWStrandWiresDAluminumAluminum-CladSteelNum-berofWiresNominalDiameterNum-berofWiresNominalDiameter(1000lbf)kNlb/1000ftkg/kmcmilmm2cmilmm2in
46、.mmin.mmSwift/AW636000322637700323AA360.13293.3810.13293.3813.661636946Kingbird/AW636000322639400324AA180.18804.7810.18804.7815.0676761006Teal/AW605000307618400313AA300.14203.61190.08522.1628.51278831314WoodDuck/AW605000307618800314AA300.14203.6170.14203.6128.41268891323Squab/AW605000307614600311AA2
47、60.15253.8770.11863.0123.61057911177Peacock/AW605000307612700310AA240.15884.0370.10592.6921.0937471112Eagle/AW556500282569700289AA300.13623.4670.13623.4626.81198181217Dove/AW556500282564800286AA260.14633.7270.11382.8921.9977281083Parakeet/AW556500282564000286AA240.15233.8770.10152.5819.3866871022Osp
48、ray/AW556500282559000283AA180.17584.4710.17584.4713.259591880Hen/AW477000242487900247AA300.12613.2070.12613.2023.41047011043Hawk/AW477000242484600246AA260.13543.4470.10532.6818.984624929Flicker/AW477000242483000245AA240.14103.5870.09402.3916.774589877Pelican/AW477000242479600243AA180.16284.1410.1628
49、4.1411.551507755Lark/AW397500201406000206AA300.11512.9270.11512.9219.687584869Ibis/AW397500201403300204AA260.12363.1470.09612.4415.870520774Brant/AW397500201403000204AA240.12873.2770.08582.1814.163491731Chickadee/AW397500201399200202AA180.14863.7710.14863.779.844422628Oriole/AW336400170343700174AA300.10592.6970.10592.6916.774495737Linnet/AW336400170341300173AA260.11372.8970.08842.2513.560440655Merlin/AW336400170337800171AA180.13673.4710.13673.478.538357531Ostrich/AW300000152304800154AA260.10742.7370.08352.1212.154392583Partridge/AW266800135271200137AA260.10132.577
