Faulty MK 80amp RCBO ?

[markymark2406]

Was this installation designed ?

6mm 3 core swa backed up at the board in the property by a 20amp 30ma RCBO
~~snip~~
we also have a 32amp ring circuit for a couple of other sockets which run a projector and what ever else

Is it a 32 amp ring because it has a 32 amp MCB or RCBO in the summer house CU ?

I am thinking an error in the wiring. If you plug something else such in to the socket where the projector was plugged in does that trip the RCBO ? If it does there is a wiring error. Probably a neutral in the wrong bus bar.

The 3 core swa is terminated in s galv box below the MK board it then is wired into the double pole main swit of the board then the live goes through to the RCBO rated at 80amp 30ma then through that to the bus bar on the bottom which in turn feeds the local mcbs one being a 32amp ring circuit.
The neutral goes through the double pole main switch then wired into the neutral bar at the top of the DB a neutral from the RCBO goes to the neutral bar as well

 

[bernardgreen]

The neutral goes through the double pole main switch then wired into the neutral bar at the top of the DB a neutral from the RCBO goes to the neutral bar as well

That sounds like only the Live is going through the RCBO. In which case it is no wonder the RCBO is tripping.

HINT the RCBO compares the current flowing along the Neutral with the current flowing along the Live. Hence there has to be a Neutral IN and a Neutral OUT connected to the RCBO

 

[AndyPRK]

Post a pic if the inside of the SH Cu to resolve thus quickly

 

[JohnW2]

That sounds like only the Live is going through the RCBO. In which case it is no wonder the RCBO is tripping. ... HINT the RCBO compares the current flowing along the Neutral with the current flowing along the Live. Hence there has to be a Neutral IN and a Neutral OUT connected to the RCBO

That would be true. However, as others have suggested, I suspect that most/all these "RCBOs" we're hearing about are RCDs and/or MCBs - have you come across an "80A 30mA RCBO" in a consumer unit?

Kind Regards, John

 

[bernardgreen]

... if that final statement relates to the supply side of the RCD (just as the first part of the sentence presumably relates to the supply side of the main switch), then there's no indication of any idiocy, is there?

If there is a second Neutral bar that the RCBO feeds then it might be correctly wired.


Until the OP posts a picture it is nigh on impossible to diagnose the problem.

 

[JohnW2]

... if that final statement relates to the supply side of the RCD (just as the first part of the sentence presumably relates to the supply side of the main switch), then there's no indication of any idiocy, is there?

If there is a second Neutral bar that the RCBO feeds then it might be correctly wired.

Yes, but as I said, the OP could have been talking about the supply side of the device (quite probably a DP RCD, not an RCBO) - in which case, again, it might be correctly wired.

Until the OP posts a picture it is nigh on impossible to diagnose the problem.

Quite so. Speculative accusations of 'idiocy' are certainly not justified on the basis of the limited 'hard facts' that we have!

Kind Regards, John

 

[EFLImpudence]

I did write a long explanation but there are so many variations with what has been said it was pointless.

I feel confident, though, in saying it is wired wrongly.

 

[AndyPRK]

I don't think it's wired correctly either lol


Are both rcd neutrals connected to the same neutral block?