To illustrate the wiring of these 3 way switches switch boxes and fixture boxes are not shown but are obviously required for every application. Wiring a 3 way light switch.
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In this wiring the source is at sw1 and 3 wire cable runs between each switch and the ceiling fan.
3 way switch wiring diagram power at switch. Two three way switches control one light with the electric power coming through the first switch flowing to the second switch and then to the light fixture. Take a closer look at a 3 way switch wiring diagram. These diagrams illustrate how to wire a pair of three way light switches in three different situations.
Regardless of what 3 way switch wiring diagram you re following you ll need to use a 3 wire cable to connect the two 3 way light switches. Pick the diagram that is most like the scenario you are in and see if you can wire your switch. Traveler wires are interchangeable.
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 black line wire connects to the common terminal of the first 3 way switch. With a pair of 3 way switches either can make or break the connection that completes the circuit to the light.
All three way switch and 2 way switch wiring diagrams have the same basic components. This might seem intimidating but it does not have to be. The ground wire goes through both switch boxes and the ceiling light box and it is connected at all junctions except the light with a pigtail short piece of wire and wire connector.
The travelers actually pass the electricity between the two 3 way switches as well as the 4 way switches shown in the 4 way switching wiring diagrams. With these diagrams below it will take the guess work out of wiring. 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.
Typical 3 way switch wiring nm cable. Wires consisting of a line a load a neutral a pair of travelers and two 3 way switches. Run new cable romex between the 3 way switches.
3 way switch wiring diagram. A three way switch is built and wired a little differently than a conventional single pole light switch. Three way light switches control a light from two locations such as from both ends of a staircase or hallway.
If you are trying to troubleshoot a 3 way switch operation you will need to identify the function of each wire. In the 1st diagram below a 2 wire nm cable supplies power from the panel to the first switch box. A 3 wire nm connects the traveler terminals of the first and second 3 way switch together.
Here a ceiling fan with a light kit is controlled with two 3 way switches. Ceiling fan 3 way switch wiring. This is the same arrangement as the second diagram on this page with a fan in place of the light fixture.
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