Please help. I have a basic understanding of electirics, but 5 Electricians
are stumped and I don't know where to go next. My mother in law heats her
house by 4 Night Storage Heaters, all of which are wired to a Economy 7
supply/fuse board, with no RCD just MCB. The largest of the Night Storage
Heaters began to fail and trip the MCD. To cut a long story short, she ended
up having a new one fitted. Unfortunately this new one also now trips the MCB.
The electricians have tried swapping the various supplies to the various
heaters around in the E7 fuse board and the same heater is tripping the
different MCB. It would be an obvious thing to consider that there is a fault
on the circuit between the board and the night storage heater. However, they
have now wired it into the day time board and it is not tripping. Has anyone
got any ideas as we need to get it wired back into the E7 circuit??

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