Exposed non-current-carrying metal parts of wet-niche luminaires supplied by flexible cord must be grounded by which type of equipment grounding conductor?

In this scenario, the requirement for grounding exposed non-current-carrying metal parts of wet-niche luminaires supplied by flexible cord is best met by using an insulated copper conductor. Insulated conductors are particularly important because they provide not only the necessary conductivity for grounding but also enhance safety by reducing the risk of accidental contact with the conductive material. This insulation helps prevent any electrical short circuits that might occur in a wet environment, which is crucial for safety in applications involving water and electricity.

Copper is often preferred in grounding applications due to its excellent conductivity, reliability, and resistance to corrosion, making it suitable for long-term applications. Insulating the copper conductor offers an added layer of protection, ensuring that there is no conductive path to ground unless a fault occurs, thus maintaining safety in case of a failure in the system.

Other choices, while potentially conductive, do not offer the same level of safety and reliability as insulated copper for this specific application. For example, bare copper lacks insulation, which can lead to dangerous situations in wet environments where contact with moisture can occur. Aluminum can also be less reliable in grounding applications due to potential issues with oxidation. Stainless steel, while strong and corrosion-resistant, does not have the same conductive properties as copper, making it less