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1.1 This specification covers concentric-lay-stranded conductors made from round aluminum 1350-H19 (extra hard) wires and round aluminum-alloy 6201-T81 (Hard: solution heat treated, cold worked and then artificially aged) core wires for use as overhead electrical conductors (Explanatory Note 1).

Note 1-Prior to 1975, aluminum 1350 was designated EC aluminum. Note 2-The aluminum, aluminum-alloy, and temper designations conform to ANSI H35.1(M). Aluminum 1350 and aluminum-alloy 6201 correspond to Unified Numbering System A91350 and A96201, respectively, in accordance with Practice E527. Note 3-This specification is the metric companion of Specification B524.