Grounding pigtails made with green insulated wires are also sold at home centers and hardware stores. A pigtail is a short length of wire that you install between the outlet terminal (or ground screw) and a group of circuit wires. Pigtail wires are easily created by cutting short lengths of scrap NM wire and stripping the ends. If there is more than one cable in the electrical box, use pigtails to connect the receptacle to the circuit wires. Never connect more than one wire to a single terminal.Another common method, called back wiring, uses self-clamping rear terminals. This method is usually avoided by professionals since such connections are notorious for coming loose. The safest way to connect wires is to use the outlet's side screw terminals, a procedure known as side wiring. A wire coming loose from an outlet can create a serious fire or shock hazard. The wire connections must be made carefully to ensure safety and proper operation.Before conducting the test, make sure your tester is working properly by first testing it on an outlet that you know is hot (energized) the tester should light up, indicating it is working. Before touching any wires in an electrical box, always test for power with a non-contact voltage tester to make sure the power is off.
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