What additional requirement should be met when using a white conductor that is not grounded?

When using a white conductor that is not grounded, labeling it distinctly is an important requirement to prevent confusion and ensure safety. White conductors are typically designated for neutral conductors in electrical systems. However, if a white conductor is being used for a different purpose—such as a phase conductor in a specific application—it must be clearly labeled to indicate its actual function in that context.

Labeling serves to inform anyone working with or around the electrical system that this conductor should not be assumed to only serve as a neutral, which could lead to dangerous situations. Lack of proper labeling can result in misuse, increasing the risk of electrical shock or short circuits.

In addition to labeling, the other options may not provide the necessary clarity or safety assurances. Being connected to another color, being within a specific gauge range, or being part of a specific circuit does not address the primary concern of identification and safety regarding the unique use of the white conductor.