MIL-C-3884A, MILITARY SPECIFICATION CORD, ELECTRICAL (SHORT LAY) (5 NOV 1970)., This specification covers 2-, 3-, and 4-conductor, extra flexible electrical cords in which all conductors under the same jacket are of the same AWG wire size. The cord insulation is styrene butadiene rubber (SBR), and the jacket is SBR or polychloroprene. These cords are suitable at low temperatures (-55c), and are for use in applications where severe flexing is a major consideration.