Wire three way switch diagram. The white wire of the cable going to the switch is attached to the black line in the fixture box using a wire nut. Wiring a 3 way light switch. With these diagrams below it will take the guess work out of wiring. So what you should see if you have correct 3 wire electrical cable romex is a black power white neutral and now a 3rd red wire.
A three way switch is fundamentally different in its operation from a regular two way switch. You must completely forget about the notion of a switch being a simple openclosed circuit and look at the diagram of the circuitry of this modern alternative. Pick the diagram that is most like the scenario you are in and see if you can wire your switch. Wiring diagrams for 3 way switches.
The following 3 diagrams show the wiring for a specially made dimmer that can be used in these circuits in place of either of the the 3 way switches or both. Interested in a 4 way switch wiring diagram. This might seem intimidating but it does not have to be. Regardless of what 3 way switch wiring diagram youre following youll need to use a 3 wire cable to connect the two 3 way light switches.
This arrangement allows for lowering the lights in a 3 way circuit. Knowing how to wire a three way lighting switch comes down to understanding the operation of this contraption. Take a closer look at a 3 way switch wiring diagram.