Residential Grade. For rough use applications inside and outside the home. Rubber construction exposes no internal metal parts, cold tolerant materials. Triple combination screws, husk and module keyed for easy alignment during wiring. Beveled edge prevents snagging when dragged. Use with 18-3 to 12-3 cable. 2-pole, 3-wire. 15A/125V, NEMA (National Electrical Manufacturers Association) 5-15. Black. UL (Underwriter's Laboratories) listed. Self-displaying rack pack.