tbh i didnt think that was a regulation....is that only in the OSG or a GN and not in the 17th?
whatever the answer to my question it would seem sensible anyway so yes
taking into account a 45% space factor what is smallest (workable) width oval conduit for a single 2.5mm cable.
I guess this applies as the thermal conductivity of PVC would be less than that of burying directly in plaster
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