Which grounding electrode conductor size requires protection from physical damage when installed?

The necessity for protection from physical damage for a grounding electrode conductor is dictated by its size and the specific requirements outlined in the National Electrical Code (NEC). In this context, conductors that are smaller in size may be more vulnerable to damage when installed in locations where they could be exposed to physical impacts or environmental factors.

A grounding electrode conductor that is 6 AWG requires physical protection because it falls within a size category where safety measures are recommended to prevent damage. The NEC indicates that conductors sized 6 AWG and larger need to be safeguarded, especially if they are run in a manner that could subject them to potential physical harm. This protection mechanism helps ensure reliable electrical grounding and bonding, which is critical for the safety and functionality of electrical systems.

Larger conductors may not require the same level of protection because they are typically more robust and less susceptible to being damaged. Thus, when considering the established codes and safety practices, 6 AWG is rightly identified as the size that necessitates protective measures.