How Do I Wire A 3 Way Switch. A three-way switch is built and wired a little differently than a conventional single-pole light switch. The common is usually connected to the black screw (should be marked common) on the switch box.
3 way wiring - neutral required at switches ... (Fannie Hunter) Please make sure you are not jamming wires into a small box. 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. A three-way switch is built and wired a little differently than a conventional single-pole light switch.
A three-way switch is designed to work in tandem with another three-way switch to allow you to control a fixture from two different locations.
The common is usually connected to the black screw (should be marked common) on the switch box.
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In normal three-way wiring, you use the traveler terminals to connect the switches and the common terminals for the power source and fixture. I have LED lights installed in the fixtures. Sign up for eletters today and get the latest how-to from Fine Homebuilding.