Which conductor size is designated as the single item bonding conductor in this standard?

• A. #4 AWG
• B. #5 AWG
• C. #6 AWG
• D. #8 AWG

Answer: (C)

Bonding is about ensuring all the metal parts of the installation share a continuous, low-impedance path to carry any fault current safely. The standard designates a specific size for the single item bonding conductor to guarantee this path is reliable under typical conditions, while also keeping installation practical.

That size is chosen because it’s large enough to handle the worst-case fault current the system might present, and still small enough to terminate easily with standard hardware. If the conductor were smaller, the bond could become high impedance during a fault, allowing voltage differences to develop between metal parts and potentially pose shock or equipment damage risks. If it were larger, it would meet the requirement but add unnecessary cost and physical difficulty without providing extra benefit for standard installations.

So the value specified by the standard—the one intended for the single item bonding conductor—is the one that balances electrical capability with practicality. To verify the exact gauge, check the standard’s bonding conductor sizing section.