ASTM_B_231_-_B_231M_-_16.pdf

Designation:B231/B231M16Standard Specification forConcentric-Lay-Stranded Aluminum 1350 Conductors1This standard is issued under the fixed designation B231/B231M;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This specification covers aluminum 1350-H19(extrahard),1350-H16 or-H26(34hard),1350-H14 or-H24(12hard),and 1350-H142 or-H242(12hard),bare concentric-lay-stranded conductors constructed with a straight round centralwire surrounded by one or more layers of helically layed wires.The conductors are for general use for electrical purposes(Explanatory Note 1 and 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.1.2.1 For density,resistivity and temperature,the valuesstated in SI units are to be regarded as standard.NOTE1Prior to 1975,aluminum 1350 was designated as ECaluminum.NOTE2The aluminum and temper designations conform to ANSIStandard H35.1/H35.1M.Aluminum 1350 corresponds to Unified Num-bering System A91350 in accordance with Practice E527.NOTE3Sealed conductors that are intended to prevent longitudinalwater propagation and are further covered/insulated are also permittedwithin the guidelines of this specification.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: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 ConductorsB354 Terminology Relating to Uninsulated Metallic Electri-cal ConductorsB609/B609M Specification for Aluminum 1350 RoundWire,Annealed and Intermediate Tempers,for ElectricalPurposesB682 Specification for Metric Sizes of 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)2.3 ANSI Documents:3ANSI H35.1 American National StandardAlloy and TemperDesignation System for AluminumANSI H35.1MAmerican National Standard Alloy andTemper Designation Systems for Aluminum Metric2.4 NIST Document:4NBS Handbook 100Copper Wire Tables2.5 Aluminum Association Document:5Publication 50 Code Words for Overhead Aluminum Elec-trical Conductors3.Classification3.1 For the purpose of this specification,conductors areclassified as follows(Explanatory Note 1 and Note 2):3.1.1 Class AAFor bare conductors usually used in over-head lines.3.1.2 Class AFor conductors to be covered with weather-resistant materials,and for bare conductors where greaterflexibility than is afforded by ClassAAis required.Conductorsintended for further fabrication into tree wire or to be insulatedand laid helically with or around aluminum or ACSRmessengers,shall be regarded as Class A conductors withrespect to direction of lay only(see 7.4).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 Oct.1,2016.Published October 2016.Originallyapproved in 1948.Last previous edition approved in 2012 as B231/B231M 12.DOI:10.1520/B0231_B0231M-16.2For 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 W.43rd St.,4th Floor,New York,NY 10036.4Available from National Technical Information Service(NTIS),U.S.Depart-ment of Commerce,5285 Port Royal Rd.,Springfield,VA 22161.5Available from the Aluminum Association,Inc.,900 19th Street,NW,Suite300,Washington,DC 20006.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.3 Class BFor conductors to be insulated with variousmaterials such as rubber,paper,varnished cloth,and so forth,and for the conductors indicated under Class A where greaterflexibility is required.3.1.4 Classes C and DFor conductors where greaterflexibility is required than is provided by Class B conductors.4.Ordering Information4.1 Orders for material under this specification shall includethe following information:4.1.1 Quantity,4.1.2 Conductor size:square millimetres,if