Federal Specification a-a-50552, Nema/ansi Fb-1, Military Specification Number W-F-406d, W-F-406e, W-F-408d, W-S-610d | Csa c22.2 No. 40;Csa c22.2 No. 94;Csa c22.2 No. 94.1;Csa c22.2 No. 94.2;Ul 50;Ul 50e | Ul 514b, Ul File Number E148720, Us Federal Specification Number a-a-50553, Csa Certified, Nema/ansi Fb-1, Military Specification:w-F-406d, W-F-406e, W-F-408d, W-S-610d