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    ASTM B778-14

    Standard Specification for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors (AAC/TW)

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    1. Scope

    1.1 This specification covers shaped wire compact concentric-lay-stranded aluminum conductor (AAC/TW) and its component wires for use as overhead electrical conductors (Explanatory Note 1 and Note 2).

    1.2 The values stated in inch-pound units are to be regarded as the standard with the exception of temperature and resistivity. The SI equivalents of inch-pound units may be approximate.

    Note 1—AAC/TW is designed to increase the aluminum area for a given diameter of conductor by the use of trapezoidally shaped wires (TW). The conductors consist of a central core of one round aluminum wire or a seven-strand compact round core surrounded by two or more layers of trapezoidal aluminum 1350-H19 wires. For the purposes of this specification, the sizes listed are tabulated on the basis of the finished conductor having an area equal to that of specific sizes of standard AAC (Table 1) or in fixed diameter increments (Table 2) so as to facilitate conductor selection.
    Note 2—The aluminum and temper designations conform to ANSI Standard H 35.1. Aluminum 1350 corresponds to Unified Numbering System (UNS) A91350 in accordance with Practice E527.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    B230/B230M Specification for Aluminum 1350H19 Wire for Electrical Purposes

    B263 Test Method for Determination of Cross-Sectional Area of Stranded Conductors

    B354 Terminology Relating to Uninsulated Metallic Electrical Conductors

    E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

    E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)

    Other Documents

    ANSI H35.1 American National Standard Alloy and Temper Designation Systems for Aluminum Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.

    NBS Handbook 100 Copper Wire Tables Available from National Institute of Standards and Technology (NIST), 100 Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070, http://www.nist.gov.

    ICS Code

    ICS Number Code 29.240.20 (Power transmission and distribution lines)

    UNSPSC Code

    UNSPSC Code 26121500(Electrical wire)

    Referencing This Standard
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    DOI: 10.1520/B0778-14

    Citation Format

    ASTM B778-14, Standard Specification for Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors (AAC/TW), ASTM International, West Conshohocken, PA, 2014, www.astm.org

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