3 Wire Switch Wiring Diagram. How To Wire A 3 Way Switch. When wiring a 3-way switch circuit we will be using a 3-wire cable known as romex coming from the source such as the breaker box.
Connect the Line brown wire coming from the light together with the 3 CoreEarth cable black wire in to the L1 terminal of the two-way switch. Secure the white wire to the second wire with the same color using a wire nut. The black and red wires between SW1 and SW2 are connected to the traveler terminals.
All three switches are connected together by a three core and earth control cable.
A metal light switch must be earthed as seen below. In this video I will show you how to wire a three way switch the easy way. Interconnecting wire courses might be shown about where certain receptacles or components need to be on an usual circuit. Then a 4-wire cable going between the two 3-way switches and then a 3-wire cable going from the switches to the load.