How Do You Wire A Three Way Light Switch. If you are trying to understand how a set of switches are wired in your house, using an ohmmeter or a continuity detector is the only way to reverse-engineer what the electrician has done (make sure you turn the power off at the fuse. You will need Three-way light switches control a light from two locations, such as from both ends of a staircase or hallway.
We must mark both ends with black electrician tape to warn that this is intermittently hot.
Controlling a light with three or more.
How do three way switches work? You can wire a three-way switch circuit several ways, but all of them require special cables and switches. If you are trying to understand how a set of switches are wired in your house, using an ohmmeter or a continuity detector is the only way to reverse-engineer what the electrician has done (make sure you turn the power off at the fuse.
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