Safe and easy to install for the Do-it-Yourselfer. Factory wired and completely assembled. Suitable for use with aluminum or copper wire. Unique cover design allows cord to be used when door is closed. 120 volt. 6-1/8 in x 5-3/8 in x 4-3/4 in TT-30R NEMA receptacle. NEMA 3R weatherproof enclosure.