Different Wiring Diagrams For A 3 Way Switch. But a wall switch that allows this bit of magic is not a standard switch. Line voltage enters the light fixture outlet box.
Two three way switches can be connected to turn on/off a hallway light from either end of the hallway for example.
And a four-way is very different again.
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Three-way switches allow you to control lights or receptacles Four-way switches are very similar in design to three-ways and are used to control lights or receptacles from three or more switch locations. There is no way we can anticipate every situation and we do our best to inform of any risks for each job. Three-way switches allow for controlling a light fixture from two separate locations, these are usually used at the top and bottom of a flight of stairs or at two different entrances to a room.