MK Consumer Units

[milliamp]

I was looking through the MK C/U design catalogue for a 100mA single module RCBO, when I found a picture of how to configure a board.
http://www.mkelectric.com/Documents/English/EN MK Catalogue/MK142-0610Aen_DOWNLOAD[1].pdf

I don't think I want to follow their designs!

Apart from that does anyone know if there is such a thing as a single module 100mA RCBO?

Thanks

 

[holmslaw]

..

 

[JohnW2]

Unlikely, 100mA rcd's are mostly used for main isolation of TT supplies because the regs call for dp isolation.

Such isolation can be achieved with a main switch. However, the OP was talking about RCBOs (for whatever reason!).

Kind Regards, John.

 

[JohnD]

you can make one with a MEM pod. you can make pretty well anything as they make a range of pods and a very big range of MCBs to fit them to.

 

[milliamp]

To satisfy John's curiosity, the reason behind the 100mA RCBO was for a feed to a detached garage. The supply is indeed TT and a new board with mainswitch is to be fitted.
The garage supply runs through the property in pvc/pvc and then out of the building in SWA, hence 100mA protection for this circuit, the other circuits will have 30mA RCBO protection.

 

[RF Lighting]

Why bother with the 100mA RCBO? Have you got money to burn or something?

A 100mA RCBO will not provide discrimination from the 30mA RCBO, so a fault in the garage would take out either device, and as 100mA does not offer protection against electric shock, it's no use for this either.

You need to either fit a 100mA type S RCD at the incommer and then local 30mA protection as required, or put a 30mA RCBO at the incommer to feed your new submains with no additional local RCD protection. The former being the better design.

 

[JohnW2]

To satisfy John's curiosity, the reason behind the 100mA RCBO was for a feed to a detached garage. The supply is indeed TT and a new board with mainswitch is to be fitted.
The garage supply runs through the property in pvc/pvc and then out of the building in SWA, hence 100mA protection for this circuit, the other circuits will have 30mA RCBO protection.

Thanks. If RF Lighting hadn't just beaten me to it, I would have responded very similarly to the way he just has (assuming that the feed to the grage is protected by an MCB).

Kind Regards, John.

 

[milliamp]

Thanks for pointing out the time delay RF, that detail was overlooked in my question, but not in the plan.
The set up is going to be as you have described, 100mA S type RCD, MCB (or RCBO, if it existed) for the garage and RCBO for the remaining circuits.

 

[ban-all-sheds]

To satisfy John's curiosity, the reason behind the 100mA RCBO was for a feed to a detached garage. The supply is indeed TT and a new board with mainswitch is to be fitted.
The garage supply runs through the property in pvc/pvc and then out of the building in SWA, hence 100mA protection for this circuit, the other circuits will have 30mA RCBO protection.

If the garage supply cable is concealed in walls or partitions at a depth of less than 50mm then 100mA protection is inadequate and you'll have wasted your money on an RCD.

If it is not so concealed, and 30mA protection is not required, then 100mA protection is pointless and you'll have wasted your money on an RCD.

You should have got somebody who knew what he was doing to do the design/