Cavity wall insulation and electric wires.

[Helpahomer]

Do i need to conduit the 2.5mm new ring main cables if i am going to insulate the wall with 50mm multipurpose 'friction fit' thermal and acoustic insulation?

I have cable clipped the 2.5mm wire to the breeze blocks...

Cheers

 

[partpdoctor]

hi
probably not, it depends on how heavily it were to be loaded.

the old on site guide (waiting for new one) i think stated that you could run a ring as an M6 which meant basically "run it most anywhere, insulation included"
i hav not got my osg to hand but i am sure someone will be along to assist shortly

 

[pdcelec]

if it is twin and earth and the insulation completely surronds the cable, the 17th edition derates the cable by 50%

 

[Helpahomer]

It's will eventually be for a kitchen, with a kickpanel heater, boiler, dishwasher, under cupboard heating and ext fan running off it, plus all usual kitchen stuff light kettle etc...

Shall i conduit it anyway to be safe?

 

[Helpahomer]

if it is twin and earth and the insulation completely surronds the cable, the 17th edition derates the cable by 50%

How come? please explain, and does conduit solve this problem? and how?

 

[pdcelec]

conduit does help with this problem (heat dissipation). Note that by introducing conduit you maybe providing a bridge that is breaking the damp proofing