How to Install a Dimmer Switch

Adding dimmer switches is a simple, low-cost way to add sophisticated lighting to any room. Installing one requires very few tools. Here's how install a dimmer switch.

Difficulty: Moderately Challenging

Instructions

Things You'll Need:

• Dimmer switch
• Wire nuts
• Wire strippers
• Screwdriver
• Electrical tape
• Needlenose pliers
• Voltage tester

1. Turn off the power to the circuit you will be working on.

2. Unscrew the existing faceplate and light switch.

3. Pull the switch out of the box before disconnecting anything.

4. Use a voltage tester to double-check that the circuit is off.

5. Unscrew the wires from the terminals on the old switch by unscrewing them. Discard the old switch.

6. Use wire strippers to strip 3/8 of an inch of insulation off the ends of the wires.

7. Take one stripped wire on the dimmer switch and one from the wall box and, using needlenose pliers or your hands, twist the exposed parts together.

8. Tighten a wire nut over the wires.

9. Repeat the previous steps with the other wires.

10. Wrap electrical tape around the wire nuts on all wires and fold the wires back into the wall box.

11. Mount the dimmer switch by screwing it into place.

12. Screw on the dimmer switch faceplate with the switch in the Off position.

13. Turn the electrical circuit back on and test the dimmer switch to ensure it is working properly.

Tips & Warnings

• Dimmer switches need a custom faceplate. Check that it is included when you buy the switch.
• Always turn the power off before doing any electrical work.