Connect the L (line) side of the tester to the photovoltaic cell string's P (positive) side. Measure the insulation resistance at the P-side terminal and check for any signs of degradation. The exact procedure is described in the following sections. It usually signifies damaged cable sheathing, moisture ingress in junction boxes, or a compromised module backsheet. In case your inverter displays an earth fault (E34 Insulation), be aware that an isolation error is a severe risk which can result in fire or electric shock.
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