For grounded PV DC systems, bonding to the grounding electrode system is performed in accordance with which NEC section?

• A. 250.166
• B. 250.122
• C. 690.41
• D. 250.169

Answer: (A)

Bonding to the grounding electrode system in grounded PV DC installations is governed by the section that specifically requires photovoltaic equipment to be bonded to the grounding electrode system. This ensures a single, low-impedance path to earth for any fault currents and establishes a common ground reference for all metallic parts of the PV installation. That explicit requirement is found in 250.166, which covers bonding of photovoltaic equipment to the grounding electrode system.

Other sections address related but different aspects, such as general equipment bonding or bonding within the PV system itself, rather than the direct bonding of PV equipment to the grounding electrode system.