When it comes to wiring a 3 way switch, there are a few different configurations you can use depending on where the power source is located. One common setup is having the power come into one of the switches, known as power at switch. This arrangement can be a bit tricky to wire, but with the right diagram and instructions, you can easily tackle the project.
Power at switch means that the power source (usually a circuit breaker or fuse box) is connected to one of the switches in the circuit. This setup is often found in older homes and can be identified by the presence of only two wires (plus a ground) at each switch location.
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To wire a 3 way switch with power at the switch, you will need to connect the power source to the common terminal of one switch and the light fixture to the common terminal of the other switch. The travelers will then connect the two switches together, allowing you to control the light from both locations.
Start by turning off the power to the circuit at the breaker box. Then, remove the cover plates from both switches and test the wires to ensure the power is off. Next, connect the power source to the common terminal of the first switch using a wire nut. Connect the black wire from the light fixture to the common terminal of the second switch. Connect the white wires from the power source, light fixture, and ground wire together using a wire nut. Finally, connect the travelers (usually red and black wires) between the two switches.
Once all the connections are made, secure the switches back into the wall box and replace the cover plates. Turn the power back on at the breaker box and test the switches to ensure they are working correctly. If everything is wired properly, you should be able to turn the light on and off from both switch locations.
Wiring a 3 way switch with power at the switch can be a bit more complex than other configurations, but with the right diagram and a little patience, you can successfully complete the project. Remember to always turn off the power before working on any electrical wiring and double check your connections before turning the power back on.