Wet niche luminaires supplied by a flexible cord or cable must have all exposed noncurrent carrying metal parts grounded by what type of equipment grounding conductor that is integral to the cord or cable?

Prepare for the Electrical Code 3 Exam. Practice with flashcards and multiple-choice questions, each with hints and explanations. Get ready and pass your exam!

Grounding through the equipment grounding conductor is required for any exposed noncurrent-carrying metal parts in a wet-location luminaire, and that conductor must be built into the flexible cord or cable. It has to be insulated copper because the insulation protects the copper path from moisture and abrasion inside the cord, ensuring the grounding path remains intact even in a wet environment. Bare copper inside a cord would be exposed to moisture and damage, which can compromise the grounding system. Aluminum or steel aren’t used for this internal grounding conductor in flexible cords because they don’t meet the same reliability and compatibility standards for grounding paths within flexible wiring. The insulated copper conductor provides a safe, continuous path for fault current to trip the protection device, reducing shock risk.