ASTM_B_978_-_B_978M_-_14.pdf

Designation:B978/B978M14Standard Specification forConcentric-Lay-Stranded Aluminum Conductors,CompositeReinforced(ACCR)1This standard is issued under the fixed designation B978/B978M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers concentric-lay-stranded con-ductors made from round aluminum-zirconium alloy wires andan aluminum matrix composite(AMC)core wire(s)for use asoverhead electrical conductors(Explanatory Note 1 and Ex-planatory Note 2).1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.2.Referenced Documents2.1 The following documents form a part of this specifica-tion to the extent referenced herein:2.2 ASTM Standards:2B263 Test Method for Determination of Cross-SectionalArea of Stranded ConductorsB354 Terminology Relating to Uninsulated Metallic Electri-cal ConductorsB682 Specification for Metric Sizes of Electrical ConductorsB941 Specification for Heat Resistant Aluminum-ZirconiumAlloy Wire for Electrical PurposesB976 Specification for Fiber Reinforced Aluminum MatrixComposite(AMC)Core Wire for Aluminum Conductors,Composite Reinforced(ACCR)E29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications2.3 NIST Document:3NBS Handbook 100 Copper Wire Tables2.4 Aluminum Association Documents:4Publication 50 Code Words for Overhead Aluminum Elec-trical ConductorsAluminum Association Guideline A Method of Stress-StrainTesting of Aluminum Conductors and ACSR and a TestMethod for Determining the Long Time Creep of Alumi-num Conductors in Overhead Lines3.Terminology3.1 Acronyms:3.1.1 ACCRaluminum conductor,composite reinforced3.1.2 AMCaluminum matrix composite3.1.3 Al-Zraluminum zirconium4.Ordering Information4.1 Orders for material under this specification shall includethe following information:4.1.1 Quantity of each size,stranding,and class,4.1.2 Conductor size,area(Section 8 and Table 1 and Table2),4.1.3 Number of wires,aluminum-zirconium alloy andAMC(see Table 1 and Table 2),4.1.4 Type of AMC core wires(see 5.3),4.1.5 Direction of lay of outer layer of aluminum-zirconiumalloy wires if other than right-hand(see 7.2),4.1.6 Special tension test,if desired(see 14.3),4.1.7 Place of inspection(Section 16),4.1.8 Package size and type(see 17.1),4.1.9 Heavy wood lagging,if required(see 17.3),and4.1.10 Special package marking,if required(see 17.4).5.Requirement for Wires5.1 Tests for mechanical and electrical properties ofaluminum-zirconium alloy and core wires shall be made beforestranding.5.2 Before stranding,the aluminum-zirconium alloy wireused shall meet the requirements of Specification B941.1This 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.DOI:10.1520/B0978_B0978M-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 National Institute of Standards and Technology(NIST),100Bureau Dr.,Stop 1070,Gaithersburg,MD 20899-1070,http:/www.nist.gov.4Available from Aluminum Association,Inc.,1525 Wilson Blvd.,Suite 600,Arlington,VA 22209,http:/www.aluminum.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.3 Before stranding,theAMC core wire used shall meet therequirements of Specification B976.6.Joints6.1 Electric-butt welds,cold-pressure welds,and electric-butt,cold-upset welds in the finished individual aluminum-zirconium alloy wires composing the conductor may be madeduring the stranding process.No weld shall occur within 50 ft15 m of any weld in the completed conductor(ExplanatoryNote 3).6.2 There shall be no joints of any kind made in the finishedAMC core wires.7.Lay7.1 The length of lay of the various layers of wires in aconductor shall conform to Table 3(see Explanatory Note 4).These are expressed in values of lay ratio.7.2 The direction of lay of the outside layer of aluminum-zirconium alloy wires shall be right hand unless otherwisespecified in the purchase order.The direction of lay of thealuminum-zirconium alloy wires shall be reversed in succes-sive layers.7.3 The direction of lay of the core wires shall preferably beunidirectional in successive layers.Use of core wires reversedTABLE 1 Construction