An intersystem bonding termination device mounted at the service disconnect means for a building is required to be connected to the grounding electrode conductors by what size conductor?

An intersystem bonding termination device mounted at the service disconnect means for a building is required to be connected to the grounding electrode conductors by what size conductor?

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

Answer: (A)

Bonding the intersystem termination device to the grounding electrode conductors must be done with a conductor large enough to provide a robust, low-impedance path. The code sets a minimum size of six AWG copper (with aluminum an equivalent of four AWG) for this bonding jumper. This minimum ensures the bond remains effective under fault conditions and is durable over time, helping maintain a common potential between the service equipment grounding system and the grounding electrode system. Using a smaller conductor would create a higher impedance path and could fail to properly establish that shared ground. You can use a larger copper conductor if desired, but the required minimum to meet the rule is six AWG copper.

Bonding the intersystem termination device to the grounding electrode conductors must be done with a conductor large enough to provide a robust, low-impedance path. The code sets a minimum size of six AWG copper (with aluminum an equivalent of four AWG) for this bonding jumper. This minimum ensures the bond remains effective under fault conditions and is durable over time, helping maintain a common potential between the service equipment grounding system and the grounding electrode system. Using a smaller conductor would create a higher impedance path and could fail to properly establish that shared ground. You can use a larger copper conductor if desired, but the required minimum to meet the rule is six AWG copper.