For grounding electrode conductors used in combined AC EGC and DC GEC for grounded PV systems, the AC equipment grounding conductor, sized according to the larger of 250.122 or 250.166, can serve as the DC grounding electrode conductor (690.47 (C) (3)).
While a separate grounding electrode system is still permitted to be installed for a PV array, per 690.47 (B), it is no longer required to be bonded to the premises grounding electrode system. In PV systems with string inverters, the equipment grounding conductor from the array terminates to the inverter's grounding bus bar.
Therefore, a separate grounding electrode system is no longer required for either grounded or ungrounded PV systems. However, some contractors, who had been accustomed to grounding the system at the inverter, still prefer to install a grounding electrode conductor at that point.
However, some contractors, who had been accustomed to grounding the system at the inverter, still prefer to install a grounding electrode conductor at that point. While this is permitted, per 690.47 (B), it is done only for grounding the PV equipment and not for grounding the PV system.
A quick review of the grounding electrode system requirements of Article 250 show that all electrical systems require a grounding electrode system. The size of the electrode system is a function of the
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A grounding electrode conductor is the conductor between a common single grounding point in the system and the grounding electrode. NEC section 690 requires that ungrounded
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