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That was my understanding of the regs.
The conduit is retained against the wall with screws and a few dabs of adhesive around and inbetween.
I'm now regretting the adhesive given the section that has come proud of the wall. I'll have a look at it once bedtime is over.
@bluehuw -
as painter I'd want that 10mm below the existing level
The room is getting skimmed by a plasterer first. My understanding is that'll be c.3mm
Overall I'm thinking about ripping it all out and using capping instead. My hope was that the conduit would make things easier and also allow for say a CAT cable in case we ever wanted to run a line down the garden. The location of the second socket was planned so that a hole through the wall comes out in a descreate but practial spot.
As that conduit isn't retained I'd want some more depth of plaster to hold it in place properly.
Based on my outdated knowledge, prescribed zones count for cables less than 50mm depth so these count as prescribed but are installed correctly as horizontal from the appliance (socket)