How to get round stud wall insulation so its not ref method 103???

[bleach]

Hi people. ... New extension install, and the studs will be packed with 140mm of celotex! How would it stand if a 50mm gap was chased in the celotex all round the cable so as not to de-rate it ridiculously. (2.5mm ring circuits). Whats the standard procedure here...upsize the cable? Thanks in advance :cheesy::cheesy:

 

[Badged01]

Interesting question. If its not touching anything by 50mm all around does that classify it as in 'free-air', or is it no worst than being in conduit/trunking? How is it going to be supported?

 

[telectrix]

Interesting question. If its not touching anything by 50mm all around does that classify it as in 'free-air', or is it no worst than being in conduit/trunking? How is it going to be supported?

same as port vale..... very poorly.

 

[bleach]

Its passing through the studs so its not dropped from above so its supported by the stud holes.

 

[Octopus]

Fit a 20A MCB?

 

[telectrix]

or 4mm RFC

 

[terminator]

Agree with Murdoch, or as you say, use 4mm - I don't think the insulation value would change much by cutting a 50mm channel

 

[bleach]

Yeah agree, prob go for the 20amp mcb. Wall insulation thicknesses are surely going crazy!! What next 300mm celotex!:banghead: Thanks for the replys anyway.