Discuss Main RCD Tripping & Not MCB in the Electrical Forum area at ElectriciansForums.net

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Happened to me many years ago changed board ,new board rcd protected tripped on connection , not touched any circuits . Found a socket fixing screw hard caught neutral when originally fitted. Worked fine before rcd fitted.
 
It looks correctly configured for me - all 7 circuits supplied from RCD - correct I would expect another RCD aswel, but is it really needed with only 7 circuits - not tried disconnecting all other circuits - sorry not got a pic

Yes it is needed, as it is at the moment it does not comply with the regulations.
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The fault I haven't come across before is the RCD tripping when touching the neutral conductors (for the ring main) to the neutral bar when all MCBs are off (the only equip. turned on is the 100A Main sw & 63A Main RCD)

IR Clear - >2000

As I said that is the normal symptom of a neutral to earth fault which is a very common occurrence.
These faults often go undetected until the CU is replaced and RCD protection added.

This is like getting blood from a stone, >2000 what? Ohms, kilohms or megohms?
And what did you test between, is that the same result L-N L-E and N-E?
 
If you had >2000Mohm between live conductors and earth it is unlikely the circuit would cause the RCD to trip!

A good example of why it is important to test an installation before replacing a consumer unit.
 
I think a photograph of the inside of this board is going to show a complete mess if it’s a diy.

If the board is diy, then I bet there’s other jobs been done in the house... shared neutrals between sockets and another circuit perhaps?
 
I think a photograph of the inside of this board is going to show a complete mess if it’s a diy.

If the board is diy, then I bet there’s other jobs been done in the house... shared neutrals between sockets and another circuit perhaps?
Borrowed neutrals would have no effect in this instance as there is just 1 RCD protecting the whole installation by the sounds of it.
 
Borrowed neutrals would have no effect in this instance as there is just 1 RCD protecting the whole installation by the sounds of it.

Yes. you're right. I misread.
He still could have used a split board, I think they go down to 3+3 with some brands, but for ease of use, RCBO's on every circuit.
 
Could the Neutrals for the socket circuits be mixed up with the socket circuit on the other side of the board? This would mean you are connecting 1 leg of each circuit into the rcd side that's tripping and causing an unbalanced load.
 
Could the Neutrals for the socket circuits be mixed up with the socket circuit on the other side of the board? This would mean you are connecting 1 leg of each circuit into the rcd side that's tripping and causing an unbalanced load.
OP are there 2 lighting circuits if yes could be he has got crossed Ns ie N for up stairs and down stairs crossed, try swapping the Ns over, let us know how you get on.
 

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