When there is no mobile home service equipment or disconnecting means, the primary protector grounding terminal or grounding electrode must be connected to the mobile home's metal frame or available grounding terminal with a copper conductor not smaller than what size?

• A. 10 AWG
• B. 12 AWG
• C. 14 AWG
• D. 8 AWG

Answer: (B)

When there’s no mobile home service equipment or disconnecting means, you still need a solid grounding path from the primary protector to the mobile home’s grounding system. Bonding the primary protector’s grounding terminal or grounding electrode to the metal frame or a grounding terminal with a copper conductor ensures fault and surge energy have a low-impedance route to ground, which helps protect occupants and equipment. The minimum size for that copper grounding conductor is 12 AWG. This size strikes a balance between safety and practicality, providing enough cross-sectional area to carry fault currents without overheating, while not being unnecessarily large. Using a smaller conductor, like 14 AWG, would be undersized for grounding and could fail under fault conditions, whereas larger conductors (8 or 10 AWG) would also work, but 12 AWG is the required minimum.