3 Way Light Switch Common Wire. Traveler wires are interchangeable on each switch. The black line wire connects to the common terminal of the first 3 way switch.
In this diagram the incoming hot wire attaches to the first switch s common dark colored terminal. Traveler wires are interchangeable on each switch. The common terminal of the second 3 way switch connects to the light fixture s.
A 3 way switch allows you to turn a light on or off from two different switches.
Install a 3 wire cable from the first switch box to the light fixture s box. The two hot wires of three wire cable connect to a pair of brass colored traveler terminals on each switch. If there is a bare ground wire attach that to the ground lug of the switch. Leave 8 10 inches 20 3 25 4 cm of wire inside each of the boxes before cutting the cable to facilitate easy splicing and connection to the switch and fixture.
