If a separate grounding electrode is installed for communications equipment on a commercial building, the minimum size bonding jumper between the communications grounding electrode and the power grounding electrode system must not be less than which gauge copper?

• A. 8 AWG
• B. 6 AWG
• C. 4 AWG
• D. 2 AWG

Answer: (B)

When a separate grounding electrode is used for communications equipment, it must be bonded to the building’s main grounding electrode system to create a single, low-impedance path for fault currents and to equalize potentials. The minimum size for that bonding jumper is 6 AWG copper. This size ensures the bond can carry fault currents without overheating and maintains a reliable connection under fault conditions. Using a conductor smaller than 6 AWG would not meet the requirement, while larger sizes are allowed but not required.