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EPS Underfloor insulation and elec cables

  • 23-05-2011 3:55pm
    #1
    creedp
    Registered Users, Registered Users 2 Posts: 5,963 ✭✭✭


    A quick question. I have 150mm of EPS insulation on the floor with a electric cable running under it for the electric induction hob which will be on a central island. I have looked in a number of threads and it seems that cabling needs to be run in a conduit if in contact with blown eps bead insulation in a cavity as the bonding agent reacts with the plastic covering the cabling and damages the insulation. Does the same apply with silver eps insulation in board form? Should I insist that this cable is run in a conduit?

    Builder doesn't know and said he will check with electrician but I would like an independent opinion if possible?

    Thanks


Comments

  • #2
    pegasus1
    Registered Users, Registered Users 2 Posts: 1,490 ✭✭✭pegasus1


    As an Electrician i would say you need to run the cable in a conduit, the cable should not be more than 45% of the volume in the conduit to allow for dissipation of heat, to be on the safe side. get the builder to chase a channel in the floor for it..


  • #3
    Carlow52
    Closed Accounts Posts: 2,389 ✭✭✭Carlow52


    pegasus1 wrote: »
    As an Electrician i would say you need to run the cable in a conduit, the cable should not be more than 45% of the volume in the conduit to allow for dissipation of heat, to be on the safe side. get the builder to chase a channel in the floor for it..

    +1 here with duct properly sealed where it comes up through eps


  • #4
    creedp
    Registered Users, Registered Users 2 Posts: 5,963 ✭✭✭creedp


    Carlow52 wrote: »
    +1 here with duct properly sealed where it comes up through eps

    Thanks for the advice Pegasus1 and Carlow52. Will pass that requirement on.

    2 further Q: is chasing the floor to aid with heat disipation or to stop compromising the insulation with the conduit? Secondly, is properly sealing the duct where it comes through the eps about filling the hole in the eps with expanding foam or that the actual conduit should be sealed with silicone?

    Thanks


  • #5
    Carlow52
    Closed Accounts Posts: 2,389 ✭✭✭Carlow52


    dont seal the conduit with silicone, it will come up through eps and the floor screed,
    the chasing is to make it easier to lay insulation


  • #6
    creedp
    Registered Users, Registered Users 2 Posts: 5,963 ✭✭✭creedp


    Carlow52 wrote: »
    dont seal the conduit with silicone, it will come up through eps and the floor screed,
    the chasing is to make it easier to lay insulation

    That's great. I had a look at the 2nd fix plumbing work and noticed that none of the pipes were chased ewhich will make it very difficult to lay the insulation in these areas. Is this the norm with plumbing pipes?

    On the cable front I had a look last night and despite I asking for the cable to be placd in a conduit I found that all the insulation had been laid (150mm of EPS plus 50mm of PIR) without this being done. Is this a 'deal breaker'? Would the fact that the cable is for an induction hob which has a high rating make this even more important than say if the cable for for a light? Should I insist that the insulation be taken up for the conduit to be fitted? I so tired of getting work redone that hasn't met with spec or instruction that at this point Im ready to throw my hat at it. However, if it compromises the insulation in a significant way I will once more insist that insulation is taken up and job done as requested.


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