Commercial and industrial power receptacles 30 A, 125/250 V NEMA 14-30 3-pole/4-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 #4 AWG wireBack features concentric knockouts and an adjustable cord clamp to allow wiring from back or bottomFor replacement use in older homes with 3 wire range and dryer connection pointsHeavy-gauge galvanized steel mounting strap for corrosion resistanceFlush receptacles fit one- or two-gang enclosuresSurface receptacles have patented lay in terminals that accept up to #4 AWG wireSurface receptacle backs feature concentric knockouts and an adjustable cord clamp to allow wiring from back or bottom