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How to add a 4Way Switch


By Dave Rongey - Summary:

How to Add a 4Way Switch with Other Light Switches: I need help adding a 4-way switch in my home.

Wiring a 4Way Light Switch with 3Way Switches

Electrical Question: I need help adding a 4-way switch in my home.

This home electrical wiring question came from Gary, in Rumney, New Hampshire.

Dave’s Reply:
Thanks for your electric wiring question Gary.

Adding a 4Way Switch to Two 3Way Switches

Application: Wiring a 4-Way Light Switch.
Skill Level: Intermediate to Advanced – Best installed by a Licensed Electrician.
Tools Required: Basic Electricians Pouch Hand Tools and Power Tools for installing electrical wiring,  and Voltage Tester.
Estimated Time: Depends on personal level experience and ability to work with hand and power tools.
Precaution: Identify the lighting circuit, turn it OFF and  Tag it with a Note before working with the wiring.
Notice: Installing additional 3-way or 4-way switch wiring should be done according to local
and national electrical codes with a permit and be inspected.

Wiring a 4-Way Switch in with two 3-Way Switches

In some areas of the home we may need more than two light switches, especially in long hallways with multiple entryways. This is an example where one or more 4-way switches may be installed.

Diagrams and Instructions for Wiring a 4-Way Light Switch

4 Way Switch Wiringdiagrams
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3-Way Switch Wiring
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Wiring 3-Wire and 4-Wire Electric Range
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