Seperate RCD enclosure

[leep82]

Ive recently been out to look at a kitchen refurb, where a split load mem memera 200 consumer unit is installed. The ring final circuit supplying the kitchen has 30mA RCD protection, no issues here. My issue is the oven supply. The OCPD is a 32a cartridge fuse which is on the non RCD side of the consumer unit.

The proposed work would involve the reposition of the old oven supply, utilising it for a new induction hob. This would involve chasing out into a wall and obviously the need for RCD protection. Im unsure due to the age of the board as to whether RCBO’s are available. With this in mind i suggested a seperate enclosure adjacent to the consumer unit to house a 63a DP RCD.

I would still be relying on the cartridge fuse for overcurrent protection in this setup, would it be better to install an RCBO in the enclosure? Just seems pointless to me.
Secondly does the enclosure need to be of metal construction? The consumer unit is of plastic construction and the suggestion of a new one to overcome the issues raised was pretty much flat refused.

 

[KEV 1 N]

There....just found these, brand new!! Bargain, only 8 left!

 

[Octopus]

I would be talking to the client about changing the CU - the board is obsolete and spares are pretty much all 2nd hand.

These conversations are difficult ........... but often a sensible course of action.

 

[leep82]

I would be talking to the client about changing the CU - the board is obsolete and spares are pretty much all 2nd hand.

These conversations are difficult ........... but often a sensible course of action.

Totally agree and it was brought up, however i can only recommend.

 

[Midwest]

Eaton do a compatible rcd field kit for Memera 2000 CU (Eaton MR30 rcd pod). They can be attached to a ALB 321 MCB.

It ain't cheap £100ish, and a big on the tall side. So if the wiring inside the CU is not tidy, you'll struggle to fit it.

 

[leep82]

Eaton do a compatible rcd field kit for Memera 2000 CU (Eaton MR30 rcd pod). They can be attached to a ALB 321 MCB.

It ain't cheap £100ish, and a big on the tall side. So if the wiring inside the CU is not tidy, you'll struggle to fit it.

That is an issue unfortunately as its a bit of a rats nest in the CU

 

[Midwest]

That is an issue unfortunately as its a bit of a rats nest in the CU

Done it successfully a couple of times, last one however I was presented with same issue of untidy wiring.

Incidentally, I faced a similar predicament recently. I posted here and as well as the advice you've been given, others suggested placing hob mcb on RCD protected side of the CU. Which is what I did.

 

[leep82]

Done it successfully a couple of times, last one however I was presented with same issue of untidy wiring.

Incidentally, I faced a similar predicament recently. I posted here and as well as the advice you've been given, others suggested placing hob mcb on RCD protected side of the CU. Which is what I did.

Unfortunately no spare ways in the RCD side of CU

 

[telectrix]

Unfortunately no spare ways in the RCD side of CU

you could possibly make a spare way on RCD side by altering the busbars.

 

[leep82]

Another issue on this job is that sockets are required for integrated appliances. I would normally position in an adjacent cupboard however i dont have that luxury with how the new kitchen is going to be installed. I have from left to right a fridge/freezer, washing machine and oven. The customer does not want FCU’s above worktop as that is the current setup and the worktops just look cluttered. Was maybe thinking off a bank of switches for all appliances but even then im unsure as to whether i have the space behind to fit a socket. Any other suggestions....??

 

[Midwest]

Extend the flexes (within reason) of the appliances to a socket in next available floor unit or some might suggest flex outlets behind the appliances to your grid switches.