an electrical wiring system for use in an ac electrical power distribution circuit including a plurality of ac electric power transmitting wires having termination ends disposed within a device box . the system includes a plug connector device configured to terminate the plurality of ac electric power transmitting wires . the system additionally includes an electrical wiring device including at least one ac electric circuit element and at least one electrical interface operatively coupled to the at least one circuit element . the electrical wiring device also includes a receptacle , wherein the receptacle is configured to receive the plug connector device such that electrical continuity is established between the ac electric circuit element and the plurality of ac electric power transmitting wires when the plug connector device is inserted into the receptacle .