two rcd's

[r.bartlett]

I have a 6 x consumer unit which is unprotected. I also have an old outdoor supply which has a 40a 30ma rcd.
I would like to know if I could add another 40a 30ma rcd to the feed to the consumer unit? (which I have from an old shower feed long removed)

Is that acceptable practice

 

[Steve]

no but testing it (with a tester) and then fitting it would be acceptable.

 

[RF Lighting]

40A is not big enough to supply a comsumer unit, and it would leave you with a single point of failure which is not allowed.

 

[ColJack]

40A is not big enough to supply a comsumer unit

how do you know? he might only have 3 lights and a kettle to run...

 

[RF Lighting]

OK then, depending on th rating of your cutout, it is highly likely that 40A is not big enough.

My other point still stands

 

[ColJack]

never disputed your other point, hence why I edited it out of the quote I made..

 

[Steve]

40A is not big enough to supply a comsumer unit

how do you know? he might only have 3 lights and a kettle to run...

er yeah, this was the basis of my saying it was acceptable . . . erm . . . (runs and hides)

 

[sparkyspike]

You'll be better off with RCBOs on a 6 way board (if your board is not an old Wylex one). Either that, or you will have to buy and fit a dual split load RCD board which will cost not quite as much, but will be much more difficult to fit than just changing the breakers.

You will also need to test the whole installation, provide a test certificate, and submit the work to building control.

 

[r.bartlett]

40A is not big enough to supply a comsumer unit, and it would leave you with a single point of failure which is not allowed.

I don't think a supply to a shed would be necessarily reliant on a single point of failure potential. It's not like I've got my granny stuffed in there

On the rating I agree a 63a would be more of the norm ..

 

[RF Lighting]

I thought you were attempting to RCD protect your existing CU with one RCD which you have spare.

If this is not the case then can you tell us what it is you are actually planning to do?

 

[ColJack]

you never mentioned it was a shed...