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Replacing and Wiring Three Way Switches

How to wire three way switches with wiring connections and wiring diagrams.

Connections for Three Way Switches
Electrical Question: One of two three way switches which control several fixtures in my shop went out.

I bought two so I could replace both. Replaced one, circuit OK. Replaced second, circuit not work from that switch. Hooked up both as old switches were. So, one works, one does not. HELP!

This electrical question came from: James, from Marblehead, Massachusetts.

Dave The Electrician’s Reply:
Thanks for your electrical question James

How to Wire Three Way Light Switches

James, identifying the wiring of your three way switch configuration is the only way to understand the right wiring connections that will make your three way switches work.
Because there are more than one wiring configuration I have created this easy to understand guide that will help you get your three ways switches wired right and working. I know you will find it to be very helpful.

3 Way Switch Diagram

3 Way Switch Diagram

In response to the requests for this information, I have developed a comprehensive,step-by-step guide designed to walk you through the identification and wiring of your 3-way switches.

» You Can Avoid Costly Mistakes! «

Here's How to Do It:
Wire It Right with the help of my Illustrated Wiring Book
Great for any Home Wiring Project.

Complete Guide to Home Electrical Wiring

Perfect for Homeowners, Students,
Handyman, Handywomen, and Electricians
Includes:
Wiring GFCI Outlets
Wiring Home Electric Circuits
120 Volt and 240 Volt Outlet Circuits
Wiring Light Switches
Wiring 3-Wire and 4-Wire Electric Range
Wiring 3-Wire and 4-Wire Dryer Cord and Dryer Outlet
How to Troubleshoot and Repair Electrical Wiring
Wiring Methods for Upgrading Electrical Wiring
NEC Codes for Home Electrical Wiring
....and much more.

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Home Wiring Guide

ELECTRICAL SAFETY

Home Electrical Wiring and Electrical Repairs

Please Note:
Unless otherwise posted, please refer to the following Guidelines when working on Electrical Projects:

Skill Level:
Intermediate to Advanced - Electrical Repairs and Circuit Wiring is Best Performed by a Certified Electrician or Licensed Electrical Contractor.

Electrical Tools Required:
Basic Electricians Pouch of Hand Tools, a Voltage Tester and a Multi Meter.

Estimated Time:
Depends on personal level experience, ability to work with tools, work with electrical wiring, and the available access to the project area.

Precaution:
Identify the project circuit, turn it OFF and Tag it with a Note before working with the wiring.

Important:
Modifying existing electrical circuits or installing additional electrical wiring should be done according to local and National Electrical Codes, with a permit and be inspected.