In switch loop wiring, the white or gray conductor is not allowed to be used as what?

In switch loop wiring, the white or gray conductor is specifically not allowed to be used as a return conductor to a switched outlet because this could create confusion regarding the wiring configuration. The standard practice dictates that white or gray conductors should be reserved primarily for neutral conductors. Using a white or gray conductor to carry switched current to an outlet could mislead anyone working on or inspecting the circuit, leading to potential safety hazards. This could result in an unsafe condition where someone might mistakenly perceive the conductor as a neutral, creating risks such as shock or circuit malfunction.

Using white or gray conductors as return paths in switch loops contradicts established wire color codes and undermines the clarity and safety standards designed to ensure systems are comprehensible and safe. Therefore, it is essential to follow this guideline for the integrity and safety of electrical systems.