Hi All
Due to a floor to roof window I have to route the ring main conduit down through 75mm of tiled wet underfloor heating screed and 100mm of celotex. To avoid derating, can I chase a channel in the slab and lay under the insulation? Only the slab is down.
Out of interest 17th edition states that derating is a problem if the route through insulation is 400mm or more, is that 400mm unbroken or 4 lots of 100mm? The reason I ask is, I have on the same ring, another patio door where I could go over it if I cant go under it.
Due to a floor to roof window I have to route the ring main conduit down through 75mm of tiled wet underfloor heating screed and 100mm of celotex. To avoid derating, can I chase a channel in the slab and lay under the insulation? Only the slab is down.
Out of interest 17th edition states that derating is a problem if the route through insulation is 400mm or more, is that 400mm unbroken or 4 lots of 100mm? The reason I ask is, I have on the same ring, another patio door where I could go over it if I cant go under it.