What is the minimum size of an equipment grounding conductor required for a circuit protected by a 100-ampere automatic overcurrent device?

The minimum size of an equipment grounding conductor is determined by the American National Standards Institute (ANSI) and the National Electrical Code (NEC). For circuits protected by overcurrent devices rated at 100 amperes, the NEC provides specific table references that dictate the minimum conductor size for grounding.

According to NEC Table 250.122, when using an overcurrent protection rating of 100 amperes, the minimum size for a copper grounding conductor is indeed 8 AWG. This size ensures that the grounding system can safely handle any fault currents and provide adequate protection against electrical shock and fire hazards.

Additionally, the grounding conductor must be sufficient to handle potential fault conditions while ensuring that connections to grounding systems maintain safety. The choice of 8 AWG aligns with these safety principles, confirming it is the correct answer for equipment grounding requirements in this context.