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The only time that the white wire needs to be re identified is when it becomes a "hot' current carrying conductor. It should be done in three and four way switching, good electricians will but with DIY home owners it usually doesn't happen. Another location it is mandatory to do is on 240 volt heating when using a two wire, black and white cable. The white must be identified as "hot" to ground. This is becoming less of a problem as wire manufactures are producing two wire red and black cables just for electric baseboard heating loads.

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Q: Is it code to re-identify the white when wiring a 3 or 4 way switches?
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