In standard 120 volt wiring the hot wire is black but it can also be red. If turning the switch off turns the wire off the red wire delivers power from the light.
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What is the red wire for. This configuration sometimes called a half hot or split tab outlet is becoming increasingly popular so its good to know how to wire it. How to replace an electrical outlet 0000. The red wire is for the light switch. Another is that the box is on a circuit three way switch loop. When you see a red wire in a light switch box it can mean two things. Red electrical wire indicates the secondary live wires in a 220 volt circuit used in some types of switch legs and in the interconnection between smoke detectors that are hard wired into the power system.
If the wire still is hot the wire is a hot wire that delivers electrical power to the branch circuit. You can connect a red wire to another red wire or to a black wire. One is that the outlet is a 240 volt one which requires an extra hot wire. A red wire in an electrical outlet often indicates a second positive live wire. In most cases you see a red wire in an outlet box only in special circumstances. Well cover the easier scenario first.
It could be there is or once was a three way switch in play. In most cases a red wire present in an electrical outlet means that a switch can operate the outlet. When you see a red wire in a 120 volt duplex outlet box its usually because one of the outlets is operated by a wall switch while the other is always on. Or it could be the red wire is the wire going to the fixture and the black wires are the live wires. A live black wire a green or copper ground wire and a neutral white wire. Generally electrical socket boxes come with three wires each of them colored differently.
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