What is the minimum-size grounding electrode conductor for a ring-type electrode?

The minimum size for a grounding electrode conductor for a ring-type electrode is determined by the National Electrical Code (NEC) requirements, which aim to ensure safety and proper functionality of grounding systems.

In this case, the correct choice of 2 AWG copper reflects the NEC specifications, which indicate that for a ring-type electrode, a copper conductor must be of sufficient size to handle fault currents safely and ensure the integrity of the grounding system. A 2 AWG copper conductor is designed to provide an adequate path for electrical faults, minimizing the risk of fire or equipment damage.

The other options, while representing various sizes of copper conductors, do not meet the NEC requirements for ring-type electrodes, which necessitate the larger 2 AWG size to ensure effective grounding and bonding in electrical installations. This requirement is particularly critical in systems where enhanced grounding is essential for operational safety, making the selection of the appropriate size conductor fundamental.