What is the maximum interval for grounding and bonding non current-carrying metal parts?

• A. 6 ft
• B. 8 ft
• C. 10 ft
• D. 12 ft

Answer: (C)

Grounding and bonding non-current-carrying metal parts is about creating a continuous, low-impedance path to the source so that any fault current can quickly flow and trip protective devices, while keeping exposed metal at the same potential. To make that path reliable across an installation, bonded points must be spaced no more than a certain distance. The maximum interval of ten feet ensures that, even if a bond somewhere in the system were damaged, nearby bonded connections are still close enough to provide an effective fault path and keep metal parts at a safe, common potential. The other distances would either be too permissive to guarantee a reliable fault current path or overly restrictive for typical installations.