Adding RCD Protection to This Consumer Unit

[Jupiter01]

I would like to add RCD protection to this garage consumer unit. It’s a sub main that is running off the Henley block and not connected into the main CU.

I can’t find any RCBO’s for this make. I have come across these RCD’s

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Perhaps it would be easiest to replace the Mains Switch with an RCD?

Thanks in advance.

 

[chivers67]

May as well replace the whole unit for £30 to £40.

 

[sparkwright]

Firstly, if it is a submain taken from the Henley block, there should be a switch fuse unit ot mini consumer unit at the house end.

HOPEFULLY you have this.

If you have this, there may be RCD protection here, or there may not be.

 

[Jupiter01]

May as well replace the whole unit for £30 to £40.

Adapting this could save me some redecoration.

 

[chivers67]

Good point, Can you post a photo of where it splits Jupiter?

 

[chivers67]

In a garage?

 

[chivers67]

Adapting this could save me some redecoration.

in a garage?

 

[Jupiter01]

in a garage?

It’s a garage converted to living space and this unit has been plastered around.

 

[Taylortwocities]

Photo please.

I would like to add RCD protection to this garage consumer unit. It’s a sub main that is running off the Henley block and not connected into the main CU.



Perhaps it would be easiest to replace the Mains Switch with an RCD?

Thanks in advance.

Yes, if there’s no RCD protection at the source end.
Also, at the source end there should be a switch fuse. Is there? What value fuse?

 

[JohnD]

Adapting this could save me some redecoration.

If the new one is slightly larger you won't see the join.

 

[Jupiter01]

Photo please.

Yes, if there’s no RCD protection at the source end.
Also, at the source end there should be a switch fuse. Is there? What value fuse?

There is the 100 amp cut out fuse but that's for the incoming supply as I understand it. If I switch off the main consumer unit using the main switch, the garage continues to have power. There is no isolator switch in the meter box but as it happens, this is due to be installed. I am guessing once this isolator is in place, I could isolate here and then replace the main switch in the garage with the suggested RCD or alternatively, replace the garage CU. Are both these options valid?

Also, if I wanted to do this before the mains isolator switch is fitted, I assume its a case of DNO coming out to pull the fuse and then reconnecting it?

Thanks for your help.

 

[Taylortwocities]

This sounds all sorts of wrong.
from your description (this is why I ask for photos) the trail looks like this
incoming supply fuse > meter tail > Henley block
then two connections to henley
1 > to house cu
2 > cable to garage

questions
what sort of cable connects the garage to the Henley block?
where is the fuse protecting the garage cable ?
where is the isolating switch for the garage cable?

 

[ericmark]

I agree with @Taylortwocities your description seems as if no overload protection for the supply cable into the garage, so ringing alarm bells.

However thinking how my own home was, with an integral garage where the power from the DNO fuse to the garage CU was shorter than the power to house CU both under a meter long, we could be getting the wrong end of the stick.

So photos please.

 

[EFLImpudence]

Surely the MCBs in the garage are the overload protection for the cable - if compliant.

 

[Taylortwocities]

Let’s play devils advocate. Suppose the cable to the garage is T&E and just buried in the ground.
Along comes Monty Don snd chops the cable with his shiny spade.
The cable is protected by the 100A service fuse….not by anything in the garage CU.