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Installing a Three-Way Switch

Project Overview

Installing a Three-Way Switch

Three-way switches can be a little confusing because, unlike a standard switch, they have three screw terminals and do not have ON-OFF markings. Three-way switches are always installed in pairs and are used to control a set of lights from two separate locations. One of the screw terminals is darker than the others. This is the common screw terminal. Before disconnecting a three-way switch, always label the wire that is connected to the common screw terminal. It must be reconnected to the common screw terminal on the new switch. The two lighter-coloured screw terminals are called the traveller screw terminals. They are interchangeable so there is no need to label the wires attached to them.

2 Steps

  1. Turn Off Power
  2. Connect the Remaining Wires
Turn Off Power

Step 1

Turn Off Power

Safety alert: always turn off power at the main service panel before attempting switch repairs or replacement. Connect the common wire to the dark common screw terminal on the new switch. On most three-way switches, the common screw terminal is copper (or it may be labelled with the word COMMON stamped on the back of the switch).

Connect the Remaining Wires

Step 2

Connect the Remaining Wires

Connect the remaining wires to the brass or silver "traveller" terminals. These wires can be connected to either screw terminal. Carefully tuck the wires into the box. Remount the switch, and attach the cover plate. Restore the power at the main service panel.

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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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