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@Airhead
You can put it in the concrete yes. Going from the book, 16mm copper if it's protected by a sheath with no mechanical protection. 25mm if it's bare. 10mm is the minimum in a sheath and mechanically protected if you have pme supply. Any other type of supply could go down as small as 2.5mm. Probably best to opt for 16mm in a sheath under the concrete.