A current-carrying wire in an electrical circuit, also called the grounded circuit wire, it serves as the return path for current, and is connected to ground at the service panel. In household electrical circuits the neutral wire is colored white or gray. Some circuits make use of the white or gray wire as a hot wire, when this is done it will be marked with black tape or paint to identify it as hot.
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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Electrical cable is available with 3 or 4 wires running through the sheathing. Cable with 3 wires is referred to with labels like 14/2 and 12/2, where the two represents the black and white, current carrying wires in the cable. The other wire, the ground wire, is ignored in this labeling. Cable with 4 wires is referred to as 14/3 or 12/3 cable. Here 3 wires carry electricity, the black, red and white. All household cable is available with 2 or 3 current carrying wires and one ground.
Another switch you may find in your home is a 4-way switch. These have four terminal screws and a fifth green one for a ground wire. Four-way switches are used between two 3-way switches to control lights from 3 or more locations. This can be handy if you have a large room with several entrances requiring light control from multiple locations.
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