Photovoltaic DC systems that are grounded have to be connected to a grounding electrode system in accordance with which NEC section?

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Grounded PV systems are treated as separately derived systems, so when they are connected to earth, they must be bonded to the building’s grounding electrode system. This creates a single, low-impedance path for fault currents and helps ensure that exposed conductive parts remain at a safe potential relative to earth. The NEC provision that covers this bonding for separately derived systems specifically requires that the PV system’s grounding electrode conductor be connected to the grounding electrode system of the structure, tying the PV setup into the building’s earth reference and protective-grounding network. The other sections address different grounding scenarios or general equipment grounding concepts, but they do not establish this direct bonding to the building’s grounding electrode system for a separately derived PV system.