In the 1st diagram below a 2 wire nm cable supplies power from the panel to the first switch box. Typical 3 way switch wiring nm cable.
A three way switch is fundamentally different in its operation from a regular two way switch.
Basic 3 way switch wiring diagram. Wiring a 3 way light switch is certainly more complicated than that of the more common single pole switch but you can figure it out if you follow our 3 way switch wiring diagram. Basic 3 way switch diagram how to wire 3 way light switch step by step. Be sure to identify the electrical circuit correctly you ll be wiring into and turn off the.
Wires consisting of a line a load a neutral a pair of travelers and two 3 way switches. In this diagram the electrical source is at the first switch and the light is located at the end of the circuit. The diagram below will give you a good understanding of what this wiring consists of.
This might seem intimidating but it does not have to be. Knowing how to wire a three way lighting switch comes down to understanding the operation of this contraption. Wiring diagram 3 way switch with light at the end.
Traveler wires are interchangeable. Learn to make a 3 way switch diagram by using these free and printable examples of three way switch diagram in the following images. The first step in any electrical project is to make sure there is no power going to the circuit you plan to be working on.
Three wire cable runs between the switches and 2 wire cable runs to the light. To get started take a look at the first diagram below. Turn the power off at circuit breaker.
Pick the diagram that is most like the scenario you are in and see if you can wire your switch. Wiring a 3 way light switch. Because 3 wire with ground nonmetallic electrical cable such as romex contains a white wire the white wire can be painted or taped black to serve as an additional black hot wire when used as the connecting wire between two three way switches.
You must completely forget about the notion of a switch being a simple open closed circuit and look at the diagram of the circuitry of this modern alternative. The black line wire connects to the common terminal of the first 3 way switch. This wire diagram shows the wiring for source power into the first three way switch then 3 wire cable to the next 3 way light switch and then on to the light or light fixtures.
If you are trying to troubleshoot a 3 way switch operation you will need to identify the function of each wire. There are three basic ways three way switches may be set up to. Take a closer look at a 3 way switch wiring diagram.
With these diagrams below it will take the guess work out of wiring. A 3 wire nm connects the traveler terminals of the first and second 3 way switch together. All three way switch and 2 way switch wiring diagrams have the same basic components.
3 way switch wiring diagram. The black and red wires between sw1 and sw2 are connected to the traveler terminals. The basic 3 way switch wiring diagram this is the most common and the easiest wiring diagram to follow of any of the wiring diagrams for a 3 way switch circuit.
How 3 way switches are wired. With a pair of 3 way switches either can make or break the connection that completes the circuit to the light.