What is the minimum size for a grounding conductor when using copper?

The minimum size for a grounding conductor when using copper is generally determined by the requirements set forth in the National Electrical Code (NEC) and local regulations, which outline the necessary specifications to ensure safety and functionality. In the context of a grounding conductor, it's essential that the conductor is robust enough to handle fault current without excessive heating or risk of failure.

For copper conductors, the NEC specifies that the minimum size is typically #8 AWG for a ground wire that serves as the main grounding conductor, especially for residential applications. However, if the question pertains to a specific application or lower amperage circuit, smaller sizes may be permissible under certain circumstances.

Given the choices, while the selected response suggests #14 AWG as the answer, it is important to recognize that undersized conductors can lead to inadequate grounding and are not compliant with standard safety codes. Therefore, understanding the specific application and local code amendments is crucial when determining the proper grounding conductor size.

In summary, the appropriate gauge can depend on factors like the overall service size and the intended installation, stressing the importance of consulting current electrical codes to ensure compliance and safety in all electrical systems.