Hannah77 Posted December 2 Share Posted December 2 Hi, I am running the lighting and ring circuits between external studs. The holes need to be positioned in the middle of the stud depth. I am installing insulation batts in the full depth of the stud so in theory the cables will be in the middle of 140mm insulation. If I routed the cable to the rear of the stud between each hole I would increase the length of wiring but then they would be only covered by insulation on one side and next to a ventilated cavity. The build up on the outside of the stud is 11mm OSB, membrane, studs and render board. Has anyone got any advise on experince with a similar set up? Not sure about how to work out de-rating. Link to comment Share on other sites More sharing options...
Hannah77 Posted December 3 Author Share Posted December 3 Pretty please! 😭 Link to comment Share on other sites More sharing options...
Mr Punter Posted December 3 Share Posted December 3 If you clip the cable to the stud it will help, as timber is not as insulative as insulation. I think this is only an issue if you have high loadings through the cables. In the past we had to use 4mm cable for power circuits but it seemed really OTT. Your sparky is the one responsible for this call. 1 Link to comment Share on other sites More sharing options...
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