How to Replace an Electrical Outlet - dummies If the receptacle is wired to the end of a series of receptacles, it usually has only two wires, and possibly a third ground wire. If it isn’t the last receptacle, two additional wires may be connected to it in order to carry current to the next receptacle. Just rewire the new receptacle the Electrical Wiring · Electronics Safety Lesson Wiring Diagrams to Add a New Receptacle Outlet - Do-it Wiring a New Outlet to a Light Fixture. This circuit diagram shows the wiring for a new receptacle outlet connected at an existing light fixture where the source hot is at the ceiling box. A switch loop with an available neutral wire is used to control the light which complies with NEC 2011 requirements.