Receptacle are provided with a safety-interlock system. Plugs cannot be inserted or removed unless the power switch is in the OFF position. The safety-interlock is designed to free both hands for insertion and removal of the plug. A cover interlock is provided to prevent entry to the enclosure while the operator is in the “ON” position. Uses standard Powertite ACP or CPH plugs for wide acceptability. Furnished with rugged cast aluminum housings.