What is the minimum size for a grounding electrode conductor for a 100-amp service according to the NEC?

The minimum size for a grounding electrode conductor for a 100-amp service is established in the National Electrical Code (NEC). For a 100-amp service, the NEC specifies that the grounding electrode conductor should be at least #8 AWG copper or #6 AWG aluminum.

Choosing #8 AWG copper or #6 AWG aluminum as the appropriate sizes ensures sufficient conductivity and safety for grounding. Copper has better conductivity compared to aluminum, which is why it can be sized smaller. These sizes are appropriate to handle potential fault currents and provide adequate grounding, which is critical for protecting both people and property from electrical hazards.

Other choices do not meet the NEC requirements for a grounding electrode conductor in terms of sufficient size for safety and effectiveness in a 100-amp service context.