The ground wire is connected to the light fixture lead and is pigtailed to the box, if it is metal. The cable run from the light fixture requires a 2-wire cable with ground. At the light fixture, completing the wiring is simply a matter of connecting the black and white circuit wires to the matching wire leads on the light fixture.
Once again, the white neutral wires are simply joined together, and the grounding wires are joined together with pigtails connecting the switch and to the box, if it is metal. However, at this second switch, the common screw terminal is connected to a black hot wire that leads onward to the light fixture. modern-day fans also have a separate blue wire that supplies power to the lights.
If the switch box is metal, it also must be pigtailed to the grounding wires. Step One: Bring the power supply in to one of the switch boxes (one hot, and one neutral), on a 14/2-wire cable. The grounding wire is connected both to the switch using a pigtail wire, and to the second cable run passing onward to the next switch. At this first switch, the black feed wire is connected to the common screw on the switch. This means that there is a black hot wire, a white neutral wire, and a bare copper grounding wire. At the first switch location, the feeder wire from the power source is a 2-wire cable with ground.The Spruce Home Improvement Review Board.
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