3 Gang 2 Way Light Switch Wiring. They are wired so that operation of either switch will control the light. Here we have a two way switching system that utilises two single gang two-way switches and a three wire control, shown in the old.
These wires come from your home's main electrical panel (usually in the basement below) and provide power to your lighting.
That's different from three-way light switches, which you might find in large room or a room with several entrances, where the main light in I have a four-gang box with four light switches just inside my front door, and for the life of me, I couldn't figure out how he had wired all of those so that each.
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One of the most common areas for this is the top and bottom of stairs. When you have two standard switches (non electronic). They are wired so that operation of either switch will control the light(s).