What is the minimum size for a copper grounding conductor according to NEC?

The National Electrical Code (NEC) specifies the minimum size for a grounding conductor based on several factors, including the service size and the type of metal used for the grounding conductor. For copper grounding conductors, the minimum size required is typically No. 8 AWG, especially in residential and commercial applications where the service disconnect is rated up to 100 amps. This size provides sufficient current-carrying capacity to safely handle fault currents, ensuring effective fault clearing and reducing the risk of overheating or equipment damage.

When following proper grounding and bonding procedures, using the correct conductor size is critical for safety and compliance with local codes. It is essential to ensure that grounding conductors can adequately carry fault currents back to the source, which is a fundamental principle of electrical safety.