What is the minimum size for grounding conductors?

The minimum size for grounding conductors is determined by the ampacity of the service. For services with a capacity of 100 amps or less, the National Electrical Code (NEC) specifies that the grounding conductor must be at least 8 AWG copper. This size provides adequate safety and protection against electrical faults, ensuring that the grounding system can effectively carry any fault current back to the ground. Using a conductor that is too small could result in overheating and potential fire hazards during fault conditions.

This requirement is part of broader safety measures designed to protect people, equipment, and property from electrical disturbances. By adhering to these guidelines, electrical installations can maintain compliance with the NEC, thereby enhancing safety standards within residential and commercial electrical systems. The other options mentioned do not meet the specific criteria outlined in the NEC for grounding conductors in relation to service capacity.