How To Wire A 3 Way Switch Wiring Diagram. These diagrams illustrate how to wire a pair of three-way light switches in three different situations. Three-way switches allow for controlling a light fixture from two separate locations, these are usually used at the In this diagram, the electrical source is at the first switch and the light is located at the end of the circuit.
Three-way switches are tricky to install, especially for DIYers who are replacing a bad switch.
Three-way switches allow you to control lights from two locations - from two doorways to a room, from the top and bottom of a stair, from house and garage, etc.
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Before proceeding, make sure you are comfortable working with. You can put your lights on a dimmer switch in no time. The wiring method will depend on whether your power goes to the switch first or the light first.