To create lights that operate with two separate switches, the electrician uses two special pieces of equipment in the circuit:. A normal switch has two terminals that are either connected or disconnected. A three-way switch has three terminalsand the switch connects the first terminal to either the second or the third terminal, as shown here:. In this diagram, a normal piece of wire comes from the fuse panel to the first three-way switch.
If you are adding wiring for a three way light switch then use the 3 wire control system.
These diagrams illustrate how to wire a pair of three-way light switches in three different situations. Three-way light switches control a light from two locations, such as from both ends of a staircase or hallway. A three-way switch is built and wired a little differently than a conventional single-pole light switch.
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