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MCB keeps tripping in new 10 way Schneider unit

Postby Spence1412 » Sun Sep 26, 2021 1:23 pm

Just installed a new 10 way Schneider unit.
All ok apart from downstairs ring.
The circuit tests ok.
A mains powered radio and one table lamp work but any more than that and mcb trips.
I have unplugged all appliances and plugged them back in one by one but they all cause tripping.
If there was a short then the radio and lamp wouldn't work would they.
Very confused.
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Postby Mr White » Sun Sep 26, 2021 8:19 pm

You said
Spence1412 wrote: The circuit tests ok.

What is "OK" and who tested it? and what was it tested with?

Picture of what trips would help.
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Postby chriscba » Sun Oct 03, 2021 8:36 pm

Swap the rings over to see if the fault moves to a different circuit.
Then if it has, you have an over sensitive MCB.
So you can change it
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Postby ericmark » Thu Oct 07, 2021 4:12 pm

I have a feeling it is not a MCB tripping but a RCBO or RCD?

I would guess wrong neutral, but as @Mr White says, who tested the circuits to show OK and how?

There should be an installation certificate showing test results, and either a compliance or completion certificate.
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