Grounding electrode conductors 6 AWG and larger that are not exposed to physical damage can be run along the surface of the building construction without metal covering or protection.

• A. 4 AWG
• B. 6 AWG
• C. 8 AWG
• D. 10 AWG

Answer: (B)

Grounding electrode conductors routed on the exterior surface can be left unprotected when they are 6 AWG or larger and the path is not subject to physical damage. The idea is that larger-diameter conductors are less likely to be damaged and don’t need a metal covering or raceway along the building surface in non‑hazardous locations.

Among the given options, the size that fits this allowance is 6 AWG—the threshold size described. Smaller sizes (like 8 AWG and 10 AWG) would require protection, while a larger size such as 4 AWG would also meet the allowance, but the choice that represents the specified threshold is 6 AWG. Remember, if the run could be damaged, protection is required regardless of size.