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Wiring diagram for a 3 way switch one of the many wiring diagrams showing different methods of wiring a three way switch circuit this electrical wiring diagram shows power into light switch box 1 wire to light from switch box 1 and from switch box 1 to three way light switch box 2. In the following diagram we show power entering switch 1 from switch 1 to the light and from the light to switch 2 in this case you will need a 3 wire from switch 1 to the light and the light to switch 2. Three way switches require a three wire cable the power wire the neutral wire and the traveller or switch wire the cable should also have a ground wire or a total of four wires in the cable the system also requires three way switches. 3 way switch wiring diagram take a closer look at a 3 way switch wiring diagram pick the diagram that is most like the scenario you are in and see if you can wire your switch. 3 way switch wiring variations additionally a 3 way switch wire diagram for dummies also with 3 way electrical switch including simple 3 way switch diagram as well as california 3 way switch diagram including 3 way switch diagram along with 3 way switch 2 lights together with 3 way switch troubleshooting also with