Please, what is the correct method of installing a 2.5mm2 ring main cable under a bedroom floor?
The floor void is 150mm deep with timber joists on 400mm centres. Underneath is a 12mm plasterboard ceiling. The void is mostly filled with fibre glass insulation, hence my concern about thermal insulation in close proximity to the cable.
Possibilities seem to be:
- Lay it flat on the plasterboard
- Pin it to the side of a joist with Tower clips - but if so how deeply down the joist? Does a 50mm clearance below the floor (which the clearance specified for cable passing through a joist to avoid nail penetration) have to be allowed?
- Run it in mini-trunking or some other type of conduit?
- Some other way? Going round the room above floor level is not a practical proposition.
In any case what would be considered the normal method if the fibre glass were not present?
TIA for help & advice.