3 Way Switch

3 Way Switch. In building wiring, multiway switching is the interconnection of two or more electrical switches to control an electrical load (often, but not always, lighting) from more than one location. While a three-way switch is very simple to many who visit Instructables.com, it is a mystery to many others.

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Three-way light switches control a light from two locations, such as from both ends of a staircase or hallway. In building wiring, multiway switching is the interconnection of two or more electrical switches to control an electrical load (often, but not always, lighting) from more than one location. Three-way switches often control one light fixture at both ends of a hallway.

Line voltage enters the light fixture outlet box.

You know the drill- one turns on the light, the other one will turn off but then the first one wont turn back on unless the other one is switched, etc.

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Wiring a 3-Way Switch

Three-way switches often control one light fixture at both ends of a hallway. It can also help to diagnose a three-way switch that does not work because someone wired the circuit incorrectly. This scene is repeated in hundreds. maybe thousands of homes every evening.