Wiring For A Three Way Light Switch. Making them at the proper place is a little more difficult, but still within the capabilities of most homeowners, if someone shows them how. For starters, it doesn't have "OFF" and "ON" printed on the toggle.
Slide your mouse over it to see it change state (requires Javascript enabled) For choosing wire color for your circuit, see later in this page. 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. First of all we need to go over a little basic terminology on switches.
If one of the black (hot) wires does have power, then that is the wire for the "always on" plug.
Before you begin anything with a three-way, you must understand that in order for you to have a three-way circuit you must have three-way switches.
When working with three way switches.there is no left side wire or right side wire or top or bottom wire there is ONLY one constant. there is one screw The easiest way to eliminate the switch is to connect the common to one of the travelers. Follow Dominick as he shows you step by step how to get it right. Three-way switches are always used in pairs.