Dimmer Switch Wiring Diagram: A Comprehensive Guide

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Single Pole Dimmer Switch Wiring Diagram Cadician's Blog

If you’re looking for a comprehensive guide to dimmer switch wiring diagram, you’ve come to the right place. Dimmer switches are a great way to control the lighting in your home, allowing you to adjust the brightness of a light to suit the specific needs of a room. But before you can use a dimmer switch, you need to wire it up correctly. To help you out, we’ve put together this step-by-step guide to wiring up a dimmer switch.

Step 1: Turn Off the Power

The first and most important step is to make sure that the power is turned off at the circuit breaker. If you don’t do this, you risk the chance of being electrocuted when working with the wiring. To be extra careful, you can also check the switch with a voltage tester to make sure that there is no power running through it.

Step 2: Remove the Existing Switch

Next, you’ll need to remove the existing switch. This is usually a simple process, as most switches are held in place with two screws. Once you’ve removed the switch, you’ll need to disconnect the wires. Make sure to label the wires so that you can reconnect them in the correct order.

Step 3: Connect the Dimmer Switch

Now it’s time to wire up the dimmer switch. First you’ll need to connect the black wire to the “line” terminal on the switch. Then, connect the white wire to the “neutral” terminal, and the green or bare wire to the “ground” terminal. Finally, connect the red wire to the “load” terminal. Once all the wires are connected, you’re ready to add the dimmer switch to the box.

Step 4: Test the Dimmer Switch

Before you turn the power back on, you’ll want to test the dimmer switch to make sure that it’s wired correctly. Connect the voltage tester to the dimmer switch and make sure that it’s reading the correct voltage. If everything looks good, you can turn the power back on and test the dimmer switch. It should be able to adjust the brightness of the light.


Wiring up a dimmer switch can be a complex process, but with a bit of patience and the right tools, you can do it yourself. Just make sure to turn off the power, disconnect the wires, and test the switch before turning the power back on. With the right dimmer switch wiring diagram, you can get your dimmer switch up and running in no time.