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Wiring a Dimmer Switch for New Lights

How to make the Electrical Connections when Wiring a Dimmer Switch: Dimmer Switch for Additional Light Fixtures, Electrical Power for the Dimmer Switch, Locating Power for a New Dimmer Switch.

Dimmer Switch Wiring

Electrical Question: How can I wire the new dimmer switch for the pendant lights using only the two wires in the existing box?


This electrical question came from: Bob, a Handyman from Waterford, Wisconsin.
See more about Home Wiring for Wisconsin

Additional Comments: Have used this website before, it is very helpful.

Dave’s Reply:
Thanks for your Home Electrical question Bob.

Dimmer Switch Wiring Wiring Connections

Application:  Dimmer Switch
Skill Level: Beginner to Intermediate.
Tools Required: Basic Electricians Pouch Hand Tools and Voltage Tester.
Estimated Time: Depends on personal level experience and ability to work with tools.
Precaution: Identify the light circuit, turn it OFF and  Tag it with a Note before working with the dimmer switch wiring.
Materials: Make sure the replacement dimmer switch has the same amperage and voltage rating as the original switch, and is fully compatible with the electrical circuit, the light fixture and the type of light bulbs being used. The dimmer switch must be rated for the  amount of watts that will be controlled.

How to make the Electrical Wire Connections When Wiring a Dimmer Switch

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Frequently Asked Questions and Comments

Questions about Wiring a Dimmer Switch for New Lights

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  1. Alex says:

    Hi Dave,
    Just installed Qty 10 dimmable LEDs in my kitchen GU10s 4W, Now my wife wants me to dim them and I have looked at LED dimmers on the net. I see you need to replace the second two way switch with a slave, but the slave only has two wires? How does my existing wiring correspond with that ie Red common or live, Blue = L1 and Yellow = L2

    Many thanks

  2. Dan Rubin says:

    I am wiring my basement to have a 3way dimmer switch. Can I use two 3 way dimmer switches to control the same set of lights?

    • Dave Rongey says:

      Hi Dan,
      Yes. Two 3way dimmers may be wired to control a set of lights. Depending on the brand of switches you select, the switches will be wired as a Master and Slave configuration, or the conventional dual 3way switch configuration.
      Thanks for sharing your dimmer switch project with us,


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