Which conduit for mains cable in a concrete slab?

[RRRRRR]

Hi- I'm burying a through-run of about 2m of a rings main in a concrete slab before Jabfloor insulating the floor and screeding over. (Basically I think it will be easier than chanelling out the underside of the Jabfloor for it, on top of concrete slab).

Is something like plastic flexible 15mm conduit OK for this? Or is say 22mm easier/ better.....OK?

Any help gratefully received. Thanks!

 

[Spark123]

Personally I'd opt for earthed 20mm metal conduit or SWA

 

[Taylortwocities]

Getting two lengths of 2.5mm² t&E is still tight in 20mm conduit.

I'd suggest 25mm and I agree steel conduit would be preferable unless you can sink it good and deep. You have to consider folk drilling into the floor in the future for door stops/new stud walls, etc etc