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Hello

I’ve been carrying out an EICR today and have come across a problem. The property is a small upstairs flat.

I’ve carried out dead tests which all came back good.. no problem on IR. There is some ‘green goo’ present in some switches but it all meggers fine.

The lighting is on a 6A 61009 rcbo 30ma serving 9 points.. including 12v fan.
It is a TNCS system and I have a ZE of 0.21.

When I tried to carry out ZS at a pendant the rcbo trips within about 2 seconds of the test starting. I then try to do an auto rcd test which won’t trip at 1 times. I’ve replaced the rcbo for a new one and still no joy. I’ve tried doing each test seperatly at 1x and 5x but it’s not tripping at all. The functional test on the rcbo works as it should.

I can’t seem to see what the problem could be? Has anyone come across anything like this before? Any help would be great as I am returning tomorrow to finish.
 

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