What is the minimum size grounding electrode conductor required for a 200-amp service?

For a 200-amp service, the minimum size grounding electrode conductor is determined according to the National Electrical Code (NEC) regulations. The NEC specifies that for a service rating of 200 amps, the grounding electrode conductor should be at least #4 AWG copper. This size ensures that the conductor can handle potential fault currents safely and provide adequate grounding for the electrical system, protecting equipment and enhancing safety.

The requirements for grounding electrode conductors are based on factors such as the size of the electrical service and the type of material used for the conductor—copper, in this case. Choosing the correct size conductor is crucial in ensuring the grounding system is effective, as a larger size conductor can carry more current without overheating.

In comparison, smaller gauge sizes, such as #6 AWG copper or #8 AWG copper, do not meet the NEC requirements for a 200-amp service and would not provide sufficient safety. Using an inadequate size could lead to increased risk of electrical fires or equipment damage. While #2 AWG copper is larger than required, it is not the minimum size—#4 AWG copper would be the correct and adequate size for this specific service rating.