If there are several ground wires, tie them all together with a short pieces of wire to connect to the terminal screws. There is no hole in the receptacle or switch for the ground wire, only a screw.
A two wire cable run from a light fixture to a switch on a wall. Its only function is to control the on and off state of the light. Underground Feed cable used to run electricity underground. The sheathing on this cable is thicker and more durable than the NM cable used for interior applications.
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If permitted, new electrical wiring may be run behind baseboards to serve a new wall receptacle, or to a switch and new ceiling light fixture. To pass the cable through the wall studs a notch is cut in the wood and a metal shield, sometimes called a nail guard, is fastened over the notch to protect the new wires from nail and screw punctures.
When running new wiring pay attention to the amp rating for the circuit you are extending. For a 15 amp circuit use 14 awg (american wire gauge) cable, for 20 amps use 12 awg, 30 amp: 10 awg, 40 amps: 8 awg, 50 to 60 amps: 6 awg. Most lighting and receptacle circuits will be 15 amps and make use of 14/2 or 14/3, but some of these circuits may also be 20 amps, so be sure of the rating and use the proper cable and devices for your project. Depending on the gauge and box depth, there is a limit to the number of wires allowed inside an outlet box. If adding new ones would force exceeding the limit it may be possible to add a junction box to the circuit.
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