A three way light switch is different than a traditional single pole light switch as it contains an extra screw to connect an extra wire.
Three pole light switch.
That s because the three way switch is used in conjunction with another three way switch to power a single light fixture and turning the light fixture on and off may require different lever positions.
This is known as the common screw and it s usually black instead of brass or silver.
Three pole or three way switches are used to control one or more lights or fixtures from multiple locations such as the top and bottom of a flight of stairs.
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With a pair of 3 way switches either can make or break the connection that completes the circuit to the light.
If you have a split outlet follow the same 3 way switch troubleshooting as with a light fixture except you will need to determine which outlet is always on.
Single pole and three pole switches look the same when installed but are used for different purposes.
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Wiring a 3 way light switch.
Whereas a single pole switch has on and off markings a three way switch doesn t.
The three way switch is a variation of the standard single pole switch which controls a light only from one location.
Closer inspection reveals that while a single pole switch has two terminals a three.
After disconnecting all the wires from the switches and from the switched outlet s turn the power on and test the wiring at the outlet.
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Three way switches control a light fixture from two locations in a room.
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.
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.
For example a long hallway or stairway might use a pair of three way.