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Cables through garage ceiling - fire break

Discussion in 'Electrics UK' started by jono_h, 29 Dec 2010.

  1. jono_h

    jono_h

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    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,
     
  2. ricicle

    ricicle

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    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 !
     
  3. jono_h

    jono_h

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    Yes, bedroom above which is why I need to maintain the fire rating.
     
  4. Adam_151

    Adam_151

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    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 :LOL:

    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)
     
  5. jono_h

    jono_h

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    Perfect, thank you.
     
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