Commercial and industrial power receptacles 30 A, 250 V NEMA 6-30 2-pole/3-wire. Heavy-duty design and construction make Arrow Hart power devices ideal for any high amperage industrial or commercial power connectivity application.Flush receptacles feature heavy gauge galvanized steel mounting strap and glass-reinforced nylon bodyPatented lay-in terminals accept up to No 4 AWG wire. (Surface)Back features concentric knockouts and an adjustable cord clamp to allow wiring from back or bottom