Grounding electrodes made of galvanized RMC must meet which specification?

Grounding electrodes made of galvanized rigid metal conduit (RMC) must meet specific requirements outlined in the National Electrical Code (NEC). For RMC to be used effectively as a grounding electrode, it is crucial that it fulfills both criteria regarding diameter and length to ensure it functions adequately in establishing a grounding system.

The specifications indicate that a grounding electrode must be at least 3/4 inch in diameter and a minimum of 10 feet in length. This is to ensure that the grounding system maintains a low impedance path to ground, which is essential for safety and the effective operation of electrical systems. The diameter ensures structural integrity, while the length is required to provide proper conductivity and to meet the necessary grounding resistance values.

Each requirement is critical; thus, simply being at least 3/4 inch in diameter does not suffice by itself. The option suggesting only the diameter neglects the essential length criteria that is also mandated by the NEC. Therefore, the requirement encompasses both the diameter and length specification to ensure comprehensive compliance and safety in grounding practices.