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You need some ferrite beads, look up Enphase ferrite beads on Google and it will explain where they are to be fitted. The beads are available on Ebay, and they are not expensive.

I have not been there when the DNO's operatives have turned up, I am based about 40 miles from the property and they do not give a time when they can get there. I believe from Norman that they have tested at the incomer next to the meter at his property and they have tested at the transformer...

The PV system is on a barn that is 25metres away from the house and thirty away from the domestic incomer and consumer unit, the inverter has been shut down for a while now until this problem is sorted out. I have also isolated the PV cables coming off the roof. Besides that if there was leakage...

His being Norman, Warwick being his electrician The PV was totally isolated for testing, the inverter initially detected the fault and gave it as a missing earth connection.

Yes, his electrician did check the continuity of the earthing conductor. The main switch was off and we still got voltage on the neutral and this is why we called in the DNO. He did have a "proper spark" with a 2391 test and inspect qualification and he was using a Kewtech KT64 tester that had...

The Ze test is testing the external earth fault loop impedance of the installation. A Ze test cannot be carried out when there is voltage showing on the neutral, the tester will pick up the problem and not let the test go ahead.