You must provide ground fault protection for DC photovoltaic (PV) arrays. But you don’t have to, if they are ground- or pole-mounted PV arrays with not more than two source circuits isolated from buildings. Also, Art. 690 requirements pertaining to DC PV circuits don’t apply to AC PV modules because AC PV modules don’t have a DC source or output circuit [690.6]. The ground-fault protection requirements for DC PV arrays depend upon whether they are grounded or ungrounded. ...

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