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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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Q: Why are both white and black hot?
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