PV cables through cellulose?

[Stratman]

Hi there!

 

Getting ready for roofing and in roof PV panels on our MBC build. PV installer says he'll run cables from the PV panels through laps in the roof felt, through the 400mm blown cellulose void between rafters (going in after) then through the vapour barrier below the rafters.

 

Do you have any thoughts about this as I am a bit worried about cables overheating and causing a fire. Is this an accepted approach to cabling?

[SimonD]

I'm not an electrician but my electrician was always reluctant to run cable through insulation like that. Instead all cabling was run in ducting installed through the insulation so there's at least some air gap between the cable and duct.

[Onoff]

Have a look here at 4.3.6. Gives the gist.

 

https://www.tlc-direct.co.uk/Book/4.3.6.htm