1、Designation:B786/B786M08(Reapproved 2013)1Standard Specification for19 Wire Combination Unilay-Stranded AluminumConductors for Subsequent Insulation1This standard is issued under the fixed designation B786/B786M;the number immediately following the designation indicates the yearof original adoption
2、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.1NOTEDesignation was corrected editorially in October 2013.1.Scope1.1 This specification cover
3、s bare combination unilay-stranded conductors made from round wires of aluminum 1350and 8000 series of aluminum alloys,for insulated conductorsfor electrical purposes.Aluminum 1350 wires in tempers-H19(extra hard),-H16 or-H26(34hard),-H14 or-H24(12hard),and-H142 or-H242(12hard)and 8000 series alumin
4、um alloyswires in tempers“0”and H1X or H2X are permitted.Theseconductors shall be constructed with a central core wiresurrounded by two layers of helically laid wires,resulting in anouter diameter equal to the compressed-stranded equivalentconductors.NOTE1For the purpose of this specification,combin
5、ation unilayconductor is defined as follows:a central core wire surrounded by a layerof six helically laid wires of the same diameter as the core wire with ahelically laid outer layer containing six smaller wires alternated betweensix wires of the same diameter as the wires in the layer underneath.B
6、othlayers have a common length and direction of lay(see Fig.1).1.1.1 For the purpose of this specification,normal conductorclassification(Class AA,A,B,C)is not applicable,as theseconductors are intended for subsequent insulation.The descrip-tive term combination unilay-stranded shall be used in plac
7、e ofconductor classification(Note 2 and Note 3).NOTE2Prior to 1975,aluminum 1350 was designated as ECaluminum.NOTE3The aluminum and temper designations conform to ANSIStandard H35.1.Aluminum 1350 corresponds to Unified NumberingSystem A91350 in accordance with Practice E527.Unified NumberingSystem a
8、lloy designations for 8000 Series aluminum alloys in accordancewith Practice E527 are listed in Table number 1 of Specification B800.1.2 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;ther
9、efore,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 of the issue in effect on dateof material purchase form a part of this specification to theextent referenced
10、 herein.2.2 ASTM Standards:2B193 Test Method for Resistivity of Electrical ConductorMaterialsB230/B230M Specification for Aluminum 1350H19 Wirefor Electrical PurposesB263 Test Method for Determination of Cross-SectionalArea of Stranded ConductorsB609/B609M Specification for Aluminum 1350 RoundWire,A
11、nnealed and Intermediate Tempers,for ElectricalPurposesB800 Specification for 8000 Series Aluminum Alloy Wirefor Electrical PurposesAnnealed and Intermediate Tem-persB801 Specification for Concentric-Lay-Stranded Conductorsof 8000 Series Aluminum Alloy for Subsequent Coveringor InsulationE29 Practic
12、e for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE527 Practice for Numbering Metals and Alloys in theUnified Numbering System(UNS)2.3 ANSI Standard:ANSI H35.1/H35.1(M)Alloy and Temper Designation Sys-tems for Aluminum31This specification is under the jurisdictio
13、n of ASTM Committee B01 onElectrical Conductors and is the direct responsibility of Subcommittee B01.07 onConductors of Light Metals.Current edition approved April 1,2013.Published April 2013.Originallyapproved in 1988.Last previous edition approved in 2008 as B786 08.DOI:10.1520/B0786_B0786M-08R13E
14、01.2For 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 American National Standards Institute(ANSI),25
15、W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 2.4 NIST Standard:NBS Handbook 10043.Ordering Information3.1 Orders for materials under this specification shall in-clude the follow
16、ing information:3.1.1 Conductor alloy,3.1.2 Quantity of each size,3.1.3 Conductor size:Circular-mil area or American WireGage,AWG(Section 6 and Table 1),3.1.4 Stranding(see Explanatory Note 1),3.1.5 Temper(see Section 11),3.1.6 Details of special-purpose lays,if required(see 5.2),3.1.7 When physical tests shall be made(see Sections 7 and8),3.1.8 Package size(see 16.1),3.1.9 Heavy wood lagging,if required(see 17.2),3.1.10 Special package marking,if required(Section 17),and3.1.11 Place of inspecti
