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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??
 
With no power present , + trained same way staff
,could be a polarity issue ! ...eek
anything is possible with a 25metre r2 lead...

testing a dead circuit is easy, polarity would be a case of start at meter and work way back from point to point testing continuity

wouldnt surprise me if the meter has been changed recently though
 
Elsparko, really helpful mate. Testing on the E7 circuit revealed no faults. How does it works on the main unit when connected to that? Surely its the same circuit just wired into E7 MCB's. As posted the E7 MCB's work fine with the others night storage heaters in which ever MCB its placed into?
 
Elsparko, really helpful mate. Testing on the E7 circuit revealed no faults. How does it works on the main unit when connected to that? Surely its the same circuit just wired into E7 MCB's. As posted the E7 MCB's work fine with the others night storage heaters in which ever MCB its placed into?
im going to have to re-read your post again
 
Elsparko, really helpful mate. Testing on the E7 circuit revealed no faults. How does it works on the main unit when connected to that? Surely its the same circuit just wired into E7 MCB's. As posted the E7 MCB's work fine with the others night storage heaters in which ever MCB its placed into?

Based on what evidence? What tests? What results?
 
Its a new storage heater as the other one was old and it was thought that the problem was with the old heater. They haven't charged for the new heater as they want to fix the problem before they do. They are willing to return the old heater to avoid unnecessary expense as long as we can sort the problem. So in other words both heaters are tripping the E7 15amp MCB but not the normal board when connected to that.....

Hum .......... this puzzles me - the supplier of the new heater is suggesting you get somebody else to find the fault?

That is bizarre to say the least.
 
Sounds like dead testing shows nothing. What ideally needs to happen is to throw a test on it immediately after it trips this can be done during the day if the electrician is confident enough to energise the E7. One random try is to replace the isolator at the heater, you never know.
 

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