If a white conductor in a Romex cable is connected to a traveler terminal on a three-way switch, it does not have to be re-identified because it is not 'hot' all the time.

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According to NEC (National Electrical Code) 2017, section 200.7(C)(2), all conductors that are not intended to be grounded or neutral conductors must be re-identified if they are used for a purpose other than their intended purpose. In this scenario, the white conductor in a Romex cable is intended to be a neutral conductor, and if it is used as a traveler, it must be re-identified with a color other than white, gray, or green to indicate its new function.

If a White Conductor in a Romex Cable Is Connected