Ark-Gard® 2 receptacle incorporates three spring-loaded slide keys that prevent the receptacle face plate from being rotated until the ENP plug is fully inserted into the receptacle; to make the connection, the ENP plug is fully inserted, and the receptacle face moved inward by pushing the plug forward; the plug is then rotated, closing the circuit; as rotation begins, the plug becomes locked in the receptacle and cannot be accidentally disengaged; in making or breaking the circuit, any resulting electrical arc is confined in the factory sealed chamber.