This AC WORKS brand inlet wiring device is a heavy-duty power input connection device. It is used for an industrial and commercial grade flange inlet. This inlet works with 10 AWG(American wire Gauge) copper wire and is commonly used for boats, RV's and small trailers or cabins, residential, transfer switch and generators. California Residents: See Proposition 65 Information Residential, Generator, Transfer Switch and cabin power inlet 30 Amp, 125 Volt Inlet NEMA L5-30P Power Inlet UL and C-UL certified 1-year limited warranty