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Hello,

Ive got typical semi detached with suspended floor boards. Downstairs wiring mostly run underneath joists.
Im installing underfloor heating and converting whilst extending groundfloor so all will be solid concrete i.e. extension is solid floor, existing floor joist taken out so typical layers are hardcore/MOT, sand, DPC 4inch concrete. Then insulation 100mm, UFH pipes in 50mm screed.

Builder says that some of wiring can be put in the 4 inch concrete in conduit to channel across rooms.

From searches in the forums and online, its mentioned but how common is this? Is it part of Regs - building or wiring? Should it be plastic pipe or metal tray in the 4 inch concrete?

It seems like a convenient place to pull cables but should be be minimised i.e. last resort if you walls/ceiling are difficult to route?

Thank you
Regards

Is he a builder or a spark - if hes not a spark you need on site guidance AND who is going to sign it off?

Definitely NOT Tray It is not unusual in commercial premises to have conduit put down before the concrete is poured, (Not often in domestic) but you must decide where everything is going to go first, you can't just lay it and hope for the best, then there is capacity of conduit, you can only run a certain amount of cables, usually you would run "singles" not the usual twin and earth, you really need to consult an electrician.

Neelix wrote: ↑Thu Dec 23, 2021 7:30 am Is he a builder or a spark - if hes not a spark you need on site guidance AND who is going to sign it off?

he is the builder. yes, ill ask about signing it off and safety certificate, thanks