Good morning.
We have a feeder to a consumer unit that for the last 30cm of its route it goes into a metal stud wall partition.
This was not caught early so that we could use an earthed metal conduit for this length and the walls are all up. Done and dusted.
This practically means that the feeder needs an RCD protection in the beginning.
End of story since we cannot interfere with the wall now.
The problem is that the CU has an 30mA RCD incomer itself.
So the RCD we are going to install upstream will be in series with the RCD incomer of the CU.
Does BS7671 accept a time delay 30mA RCD for the feeder that goes within the wall partition?
If it would I could still have some kind of "discrimination" with the RCD downstream in the CU.
I have been looking through BS7671 to find a respective regulation but I could not find something.
My gut says that its unlikely that I can use a time delay RCD but I cannot substansiate this with a regulation.
Any help is more than welcome!
Cheers
