This wire is sometimes red.
Red light in wall switch.
The red wire is for the light switch.
When you see a red wire in a 120 volt duplex outlet box it s usually because one of the outlets is operated by a wall switch while the other is always on.
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Or it could be the red wire is the wire going to the fixture and the black wires are the live wires.
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It could be there is or once was a three way switch in play.
This configuration sometimes called a half hot or split tab outlet is becoming increasingly popular so it s good to know how to wire it.
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When you see a red wire in a light switch box it can mean two things.
The black hot wire goes to the brass screw or into the hole in the back of the device on the same side as the brass screw.
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The green or bare copper ground wire if the device has one attaches to the green screw terminal on the switch or to the electrical box.
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We ll cover the easier scenario first.