Cables through garage ceiling - fire break

[jono_h]

I have to bring a selection of cables through my garage ceiling - 3" of celotex and then plasterboard.

Is there a best practice method of doing this? Will running the cables through the insulation require some de-rating?

I had thought about running the cables through a piece of drainpipe or similar through the insulation, but if I then stuff it full of rockwool to maintain a fire rating it seems as bad as having it running straight through the insulation.

Thanks,

 

[ricicle]

Is there part of a dwelling above the garage ?

If the run is through a standard thickness of insulation board then I would not worry about de-rating too much unless you think that all the circuits will be running at full load all the time !

 

[jono_h]

Yes, bedroom above which is why I need to maintain the fire rating.

 

[Adam_151]

http://www.safelincs.co.uk/Small-Intumescent-Trunking-Pillows/?fGB=true

These are what are often used when containment passes through a fire break, stuffing it full of fibreglass is frowned upon

And around the outside of containment is sealed with something similar to this: http://www.powertools2u.co.uk/seala...ls2u&utm_medium=Froogle&utm_campaign=Shopping

Like Ricicle says thouygh...not sure I'd be two worried about a few lightly loaded twin and earths passing through a bit of cellotex though (I'd be temped to put a bit of sturdy plastic between the two though, so there is no chance of any damage to the cable sheath and insulation making the foil on the insulation live)

 

[jono_h]

Perfect, thank you.