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I'm assuming you are talking about North American building wiring. Black should be hot. If the white is hot, it is open (disconnected) somewhere, or mis-wired. An open neutral can be energized by voltage feeding from a hot, through a load, such as a lamp, to the ungrounded neutral. More people are hurt or killed by open neutrals then by hot wires because they assume the neutral is 'cold' and neglect to take safety precautions. Of course, someone might have used a white for hot intentionally, either out of ignorance or just too lazy to getthe correct wire. Either way, if you are asking this question, you should have a qualified electrician have a look before someone gets hurt. IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS. If you do this work yourself, always turn off the power at the breaker box/fuse panel BEFORE you attempt to do any work AND always use a meter or voltage indicator

to insure the circuit is, in fact, de-energized.

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What is the red wire and what wire does it go with when there are three wires black red and white?

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Which is the hot wire if there are both black and red wires?

The hot wire could be either the black or red wire, as both are commonly used for hot wires in electrical wiring. It's important to use a voltage tester to determine which is carrying the current before working on the wires.


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If both the black and white wires are hot, it sounds like the wiring may have been done incorrectly. It's important to have a licensed electrician evaluate and correct the issue to ensure proper and safe wiring. Connecting a four-prong outlet with reversed hot wires can be a safety hazard and needs to be addressed by a professional.

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