When the switch loop uses a white or gray conductor for circuits of 50 volts or more, the reidentification must be by a color other than white, gray, or green. Which of the following describes the method?

• A. Marking tape, painting, or other effective means of a color other than white, gray, or green
• B. Labeling with 'Ungrounded'
• C. Applying green paint
• D. Wrapping with black tape

Answer: (A)

When a white or gray conductor is used in a switch loop for circuits 50 volts or greater, it must be reidentified so it’s clear that this is not a neutral. The required approach is to apply a color marking—by tape, paint, or another effective method—in a color that is not white, gray, or green. This makes the conductor’s true purpose obvious at a glance and aligns with the color conventions that keep neutrals, grounds, and hots distinguishable.

Using a color other than white, gray, or green communicates that the conductor has been repurposed as a hot conductor, avoiding the confusion that would come from continuing to rely on the original white/gray color. Green is reserved for grounding, so painting or marking with green would be incorrect. Labeling with a plain text like “Ungrounded” doesn’t change the conductor’s color coding, so it doesn’t satisfy the reidentification requirement. Wrapping with black tape is a possible method of marking, but the standard description covers the general method of marking with any color other than the restricted ones, which is why the broad option is the best fit.