3 Way Light Switch Common Wire. 3 install the first 3 way switch in the box with the hot wire attaching the hot wire to the common terminal of the switch. The common terminal of the second 3 way switch connects to the light fixture s.
3 way switches are useful for large rooms with multiple entrances but require a bit more wiring than a standard single pole switch. For example they can be arranged so that the feed cable runs to the first three way switch then to the light fixture box then to the second three way switch. 4 go to the other box without a hot wire.
Connect the ground wire to the green screw.
Traveler wires are interchangeable on each switch. Traveler wires are interchangeable on each switch. In this diagram the incoming hot wire attaches to the first switch s common dark colored terminal. Install a 3 wire cable from the first switch box to the light fixture s box.
