When a white wire is used as a traveler conductor for three-way and four-way switching, it is required to be re-identified as an ungrounded conductor.

Question

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According to the National Electrical Code, when a white wire is used as a traveler conductor in a three-way or four-way switch circuit, it must be re-identified as an ungrounded (hot) conductor by using an appropriate color or marking, such as black, red, or blue tape. This is to avoid confusion and ensure proper wiring connections.

When a White Wire Is Used as a Traveler Conductor