cable. The two standard types of machines are the squirrel cage, with square steel bars, and the abra-sive grit type. abRasiON ResisTaNCe - The ability of a wire or cable jacket to resist surface wear. aC - Abbreviation for alternating current. See alter-nating current. Also abbreviated as ac. aCCeleRaTeD liFe TesT - A test in which a cable