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Apologies for headline trying grab attention

So can someone help on this scenario.

Plant room prob 7Mx7M square ish. Loads of HVAC, pumps etc as you would expect and a ring final circuit.

Socket been damaged somehow and went to replace socket.

After replacing socket just for peace of mind we test that circuit. IR ok elip ok polarity etc.

Test RCBO and with cables disconnected as per GN3 all ok.

Just testing further and left loop tester on high current and the RCBO did not trip unusual so we got out RCD tester and couldn't get the RCBO to trip from socket. Yet with cables disconnected works as should.

So what going on and ae replaced RCBO and same ?

But circuit looks ok all in tact all tests on circuit as expected.

So unplug everything thinking maybe some item plugged in causeing problem but NO joy still.

Anyone ?
 
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