Array residual current detectionEither a) 30mA residual current detection between the inverter and the mains per 4.8.3.4, orb) monitoring for both continuous excessive residual current per 4.8.3.5.1 a) and excessive sudden changes per 4.8.3.5.1 b) Action on fault: shut down the inverter, disconnect from the mains, and indicate a fault in accordance with 13.9