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PVC Cables running under reinforced concrete

Steven Gibson

Hi All,

I am looking for some advice.

We are looking at a heavy industrial unit where it is being proposed to run the cables to the equipment under the concrete slab in the ground (not ducted) backfilled then slab over the top. 

my question is can I run PVC cables in this area as it is technically under the building then entering into the space circa 5m.

I cant see anything in the regs. I would prefer to run in ducts to each but have been asked this question.

regards

Steven

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  • 0
    Steven Gibson said:
    We are looking at a heavy industrial unit

    I have run SWA (so armoured as Graham points out) from an intake in a garage on the boundary across the garden (so soft sand as Mike points out) and then under the kitchen floor, but this sounds rather different.

    I suppose that compliance is compliance irrespective of the load, but how heavy is this heavy industrial unit? What size are the cables?

  • 0 in reply to Chris Pearson
    Chris Pearson said:
    but this sounds rather different

    In terms of someone accidentally digging it up, yes ... but thinking about the hazards ... it's not like you could excavate to find the cable if there's a need to core and bring another service up through the slab, is it?

    I'm still on the side of needing 522.8.10 provisions ?

  • 0 in reply to gkenyon

    To mole under the finished building may be possible - though that rather depends on the peripheral foundations. In the event of a problem I still thing it will most likely be a case of abandon and re-route.

    Ducting at least going to a manhole at the outside edge of the building would make far more sense.

    Mike.

  • 0 in reply to mapj1
    mapj1 said:
    Ducting at least going to a manhole at the outside edge of the building would make far more sense.

    Agreed ... but then perhaps causes the problem (if the ducts can fill with water) of PVC being more susceptible to water-logging?

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