The portion of the bonding jumper that connects to a rod-type supplemental grounding electrode shall not be larger than 6 AWG copper.

• A. True
• B. False
• C. Not specified
• D. Depends

Answer: (A)

The bonding jumper that ties a rod-type supplemental grounding electrode into the building’s grounding system is restricted in size. It is not allowed to be larger than 6 AWG copper. This keeps the connection to the rod electrode practical and dependable in the field, while recognizing that the heavy fault-current path is provided by the main grounding conductor, not the small supplemental jumper. Using a larger conductor to connect to the rod doesn’t provide additional benefit for fault currents and can complicate installation and corrosion performance, so the code sets this maximum.