OK here goes (newbie to forums so please be gentle).
I have a split consumer unit with standard wiring setup. I have a MCB on the unprotected side (non RCCB side) and I have checked that it is connected to the unprotected neutral block. When I reset this MCB the RCCB trips! BUT not the MCB itself.
As this MCB is not on the RCCB side, why would this happen?
Do I have an earth leak on that MCB circuit?
Any help appreciated.
Thanks