Culus Federal Spec. W-F-408e, Nema Fb-1 | Csa Certified to c22.2 #188, Ul Listed to 486c, Complies With Federal Specification W-S-610e | Ul 489,Federal Specifications Classification W-C375 | 2.9000 in X 2.9000 in X 2.6000 InSouthern Tier Electric Supply