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Installing a Dimmer Switch

Project Overview

A dimmer switch is one of life's little conveniences that, once installed, you wonder how you ever got along without it. Not only can a dimmer create the perfect ambiance, it can also save you money by conserving energy. You can save on your energy bills simply by dimming lights when full lighting isn't necessary. Any standard single-pole wall switch is a good candidate for replacement with a dimmer switch - as long as there's ample room in its electrical box and the light it's controlling is dimmable.

Step 1

Turn Off Power

Turn off power to the circuit at the main service panel. Use a neon circuit tester to make sure the power is off. Connect the wire leads of the dimmer switch to the circuit wires using wire connectors. The switch leads are interchangeable and can be attached to either of the two circuit wires. If your dimmer switch happens to have a third (green) wire, this is a grounding lead; attach it to the grounded metal electrical box or the circuit's bare copper grounding wire.

Step 2

Dimmer Switches

A three-way dimmer has an additional wire lead. This "common" lead is connected to the common circuit wire. On a three-way switch, the common circuit wire is the one attached to the darkest (or copper) screw terminal on the old switch; it also may be labelled with the word COMMON on the switch itself. Only one of the pair of three-way switches may be a dimmer switch; both switches will turn the light fixture on and off, but only one can control its intensity.

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Project Details

Skill Level: Beginner

Time: 1 hour

Before you start, read this »

Due to differing conditions, tools, and individual skills, The Home Depot® assumes no responsibility for any damages, injuries suffered, or losses incurred as a result of attempting to replicate any of the home improvement ideas portrayed in this website Before beginning any home improvement project, review it thoroughly to ensure you or your contractor can finish the project and if any doubts or questions remain, consult local experts or authorities. Because codes and regulations vary greatly, you always should check with authorities to ensure that your project complies with all applicable local codes and regulations. Always read and observe all of the safety precautions provided by any tool or equipment manufacturer, and follow all accepted safety procedures.

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