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Should be fine as long as the conduit is well packed with plaster so it can't move
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For maximum strength I'd want around 5mm of plaster above that.
I expect most plasterers would skim over it anyway without any short-term issues, but if the plaster is only ~2mm thick it'll be prone to cracking there.
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Being very honest, that needs to be deeper. I agree with @JonoMarshall that 5mm is fine, a bit more would be even better.
I don't know how much of the theory you know but cables in walls run in permitted zones, and the protection should come from mechanical protection (conduit or capping) plus a 30 mA RCD on your ring main. I believe there is no minimum depth under the regs, but there is a maximum (50mm) - this makes sense because you could just run conduit over the wall. I mean, it would look shit, but you could.
I'm presuming you already know about extending ring mains, not to run a spur off a spur etc.
I think you're using oval conduit there(not sure?), if so it's OK but trunking with a clip on cover is much easier as you can run the cables then pop the cover on afterwards. I'm deeply unsure about the screws (how do you avoid the cables?) through the conduit but if you're thinking about capping anyway that style of trunking could be an alternative.
I am not an electrician (so usual pinch of salt on my advice) and you should get this worked checked by one and a minor works cert issued, but I feel your pain as I'm currently in the middle of moving five 2 gang sockets and installing two new ones because architects...
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rhowe
JonoMarshall
Fox
@hugo7
I'm adding two sockets in a room. The whole room will be reskimmed.
Right now I'm chasing in a channel to run the cables in conduit.
How deep does the conduit need to be?
Currently it is maybe 1mm below the existing surface. No idea how to photograph this but here is a pic.
Any quick answers appreciated as I only have a small window of time left for the messy work before everyone gets home.
(the reason for running them through conduit was general Internet research showed this as the best belt and braces approach)
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