Wire Diagram 3 Way Switch. Pick the diagram that is most like the scenario you are in and see if you can wire your switch. In the above 3 way switch wiring diagram at each switch the black wire gets connected to the copper or black screw.
A 3 wire nm connects the traveler terminals of the first and second 3 way switch together. 3 way switch wiring diagram. Take a closer look at a 3 way switch wiring diagram.
Wiring diagrams for 3 way switches 3 way switch diagram 2 above shows the electricity source starting at the fixture.
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. The white wire of the cable going to the switch is attached to the black line in the fixture box using a wire nut. Traveler wires are interchangeable on each switch. In this diagram the incoming hot wire attaches to the first switch s common dark colored terminal.
