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How to Wire Three Way Switches Part 2

3Way Switch Wiring Diagrams

3Way Switch Diagrams #4, #6 and #6

wiring-a-3-way-switch Summary: Continuing on with wiring three way switches, these next three wiring diagrams in this series will help you identify three more possibilities for wiring the power feed and the switch wiring that leads to the light fixture.

Understanding 3 Way Switches


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The name "three-way" can be a somewhat misleading because there are only two switches that are used to turn on and off one or more light fixtures from two locations.

An electrician may understand that a three way switch is actually a single pole, double throw switch. What this means is that a three way switch has a common terminal which toggles power from the other two terminals.

A three way switch is unlike a single pole light switch because it does not have an ON or OFF position, and you will not see the ON and OFF markings on a three way switch.

Where are Three Way Switches most commonly used?

Examples where three way switches are found in residential homes:

Hallway Lighting
Install 3way switches at each end of the hallway.

Stairway Lighting
Install 3way switches at the upstairs and downstairs locations.

Garage lighting
Install a 3way switch in the garage, and inside the house.


3-Way Switch Wiring
3-Way Switching provides switching from two locations
3-way switch wiring diagram #4

3-Way Switch Wiring Diagram #4 above, shows the electric circuit source power starting at the lower 3-way switch.

3-way switch wiring diagram #5

3-Way Switch Wiring Diagram #5 above, shows the electric circuit source power starting at the light fixture box, and the switch wiring leads out to the two 3way light switches.


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Wiring 3-Way Switches
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Frequently Asked Questions

More about Wiring 3way Switches


How To Fix 3Way Light Switch Wiring

How to Get Your 3Way Light Switches Working: The Most Common Problems with 3Way Switches and How to Fix Them.


How Can I Light Up a Dark Hallway at Night for my Child?

I have a 6 year old who is terrified to walk down the dark hallway at night to get to the bathroom. I wanted to switch out the 3-way switch for a 3-way dimmer switch so I can leave the light on but dimmed so the whole hallway is illuminated.


How Can I Have a Light Switch that Has a Light In the Switch?

I have a ceiling light in my bathroom with two 3way switches. I want to add some sort of a light Or lighted switch that would be on when the bathroom light is on, how can I wire this?


Wire Size when Wiring 3Way Switches

There are three switches in a 3 gang box, do I need the 12/3 wire: Electrical Question about Wiring 3-Way Switches.


Replacing a 3Way Switch with a Time Switch

Converting a 3Way Switch to a Time Switch: Converting the wiring from two 3way switches to become a single timer control is accomplished by converting the wiring so that the power source of the hot and neutral are at the location where the timer will be installed.


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Learn more about Wiring 3way Switches