When using Type NM cable a white wire is sometimes used as a traveler conductor for three-way and four-way switching and is required to be re-identified as an ungrounded conductor.

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This statement is true. According to the National Electrical Code, when a white wire is used as a traveler conductor for three-way and four-way switching, it must be re-identified as an ungrounded conductor with a different color or by other approved means such as marked with black or red electrical tape. This is to avoid confusion and ensure proper electrical connections are made.

When Using Type NM Cable a White Wire Is Sometimes