Mcb trips no load
- Thread starter gamo_77
- Start date
Fault on circuit probably
Photo
That is a RCBO so it’ll trip on a fault
to earth. How long ago was the CU fitted?
to earth. How long ago was the CU fitted?
Sounds like a large overload to me, possible cable damage shorting out somewhere. Rodents or similar.
I think the ring circuit needs to be removed from the RCBO and thoroughly tested by an electrician not a DIY option i'm afraid
I think the ring circuit needs to be removed from the RCBO and thoroughly tested by an electrician not a DIY option i'm afraid
did the spark who installed the cu give you a certificate? If so having this available for somebody investigating the issue might be helpful
Does it still trip the RCBO (the one with the 'TEST' button), if all of those MCB's are set to off/down?
I am assuming the spark from the area of the DNO fuse, must mean a L to E fault, rather than a lower current N to E fault, hence my suggesting turning all of those MCB's to the off position for a test.
Aside from your above problem, it seems there may be a poor connection at the DNO's fuse, hence the sparking you are reporting - so that needs investigating by the DNO.
I am assuming the spark from the area of the DNO fuse, must mean a L to E fault, rather than a lower current N to E fault, hence my suggesting turning all of those MCB's to the off position for a test.
Aside from your above problem, it seems there may be a poor connection at the DNO's fuse, hence the sparking you are reporting - so that needs investigating by the DNO.
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ASAP, I would suggest. Call them today on 105
Thanks for all the replies.
Called 105 and had someone out last night , degradation underneath fuse housing and earth connection. Stripped back and change to new . Still got mcb tripping but while power was down checked a few sockets , think one needs attention by a sparky so await him coming( looks like damp in socket as oxidation on some fittings and cable).
Called 105 and had someone out last night , degradation underneath fuse housing and earth connection. Stripped back and change to new . Still got mcb tripping but while power was down checked a few sockets , think one needs attention by a sparky so await him coming( looks like damp in socket as oxidation on some fittings and cable).
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They are all RCBOs.
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