RCCB as main switch? | Page 4 | on ElectriciansForums

Discuss RCCB as main switch? in the UK Electrical Forum area at ElectriciansForums.net

N

Noob2013

Hi all,

I have been to a property where the tails come out of the meter and into an RCCB which then feeds the main switch of the consumer unit. All circuits are protected by MCBs.

If I'm adding a new circuit, is it best put in an RCBO instead of an MCB?

Thanks
 
Yes you will need to RCBO it. If the main is time delayed you will achieve the required discrimination between the RCBO & the RCCB.

From the description , and without looking at it !
I would say that the installation is likely to be TT , hence the up front rcd ( probably an 100mA S type ) so why or how could it possibly be failing any regs if the new circuit was to be just installed on a new rcbo ( even then if needed ? ) , instead of a whole new board !?
 
It may well be one of these chuckle, and the OP is confused.
 

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From the description , and without looking at it !
I would say that the installation is likely to be TT , hence the up front rcd ( probably an 100mA S type ) so why or how could it possibly be failing any regs if the new circuit was to be just installed on a new rcbo ( even then if needed ? ) , instead of a whole new board !?

My point was the opposite. To not install a MCB but an RCBO.
 
My point was if he installs a new circuit to a board which has a RCD main switch (and doesn't need it) then in affect he will be making the existing circuits worse by adding to the problem of one RCD protecting the whole installation. I know it is not clear cut and is only my interpretation so I think a board change would ensure all the new work is compliant.
 

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