Hi, was helping a friend out the other day & a new consumer was fitted with a 80 amp 30ma rcd controlling the whole flat.
He tested everything & all seemed to be fine, with the exception of when the neutral & earth was shorted out directly the RDC didn't trip, yet it tripped with the test meter & also via the RCD test button. So he thought it was a faulty rcd & changed it but still getting the same results.
The intake is a 1980's PME.
Any suggestions??
Thanks.