A four way switch has an extra common screw to bring the total number of screws up to four.
Three way light switch.
For example a long hallway or stairway might use a pair of three way.
Before proceeding make sure you are comfortable working with electrical wires and switches.
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Wiring a 3 way light switch.
Most common is the single pole switch the type used to control a light fixture from a single location the next most common is the three way switch which is commonly used to control a light fixture from two different locations.
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In a hallway or large room for example installing three way switches at both ends lets you turn the light fixture on or off from both locations.
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A three way wall switch is a common type of light switch that makes it possible to control a ceiling light or other electrical fixture from two different locations in a room.
A 3 way wall switch controls a common light or set of lights from two separate switch locations.
Four way circuits are just a tad different than three way circuits mostly since the light switch that you add in has to be a four way switch rather than just another three way switch.
Wall switches used to control ceiling light fixtures or other fixtures come in three types.
With a pair of 3 way switches either can make or break the connection that completes the circuit to the light.
Wiring a 3 way light switch is certainly more complicated than that of the more common single pole switch but you can figure it out if you follow our 3 way switch wiring diagram.
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