This 3 way switch wiring diagram shows how to wire the switches and the light when the power is coming to the light switch. If you have any problems with these switches it may be best to call an electrician.
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Three way switch circuit diagram. The diagrams below show the conventional wiring for 3 way switches. Wires consisting of a line a load a neutral a pair of travelers and two 3 way switches. Pick the diagram that is most like the scenario you are in and see if you can wire your switch. A 3 wire nm connects the traveler terminals of the first and second 3 way switch together. See alternate 3 way switch wiring configuration for another way 3 way switches may be wired. If you are trying to troubleshoot a 3 way switch operation you will need to identify the function of each wire.
Take a closer look at a 3 way switch wiring diagram. Three wire cable runs between the switches and 2 wire cable runs to the light. The black and red wires between sw1 and sw2 are connected to the traveler terminals. In this diagram the incoming hot wire attaches to the first switchs common dark colored terminal. All three way switch and 2 way switch wiring diagrams have the same basic components. 3 way switch wiring diagram.
Unfortunately not all 3 way switches are wired the conventional way. The black line wire connects to the common terminal of the first 3 way switch. Wiring diagram 3 way switch with light at the end in this diagram the electrical source is at the first switch and the light is located at the end of the circuit. Traveler wires are interchangeable on each switch. The two hot wires of three wire cable connect to a pair of brass colored traveler terminals on each switch. This might seem intimidating but it does not have to be.
In the 1st diagram below a 2 wire nm cable supplies power from the panel to the first switch box. With these diagrams below it will take the guess work out of wiring.
Gallery of Three Way Switch Circuit Diagram
