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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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    There is nothing stopping you, regs wise, from burying a cable suited for direct burial, back filling with soft sand and all the rest, and then laying  tarmac or concrete or indeed building a wall over the top - DNOs do this all the time, but they expect their cables to outlast the buildings above, and while after a fashion it is "accessible with tools", this may - as others have alluded to above, mean some serious demolition, or more likely an abandon and re-route if there is ever a problem.

    Where cables emerge through the floor slab will need some sort of hockey stick shape of tubing to protect them during pour, and maybe a solid protective enclosure if the floor is the kind laid by cement mixer and 'elephants trunk', at least until the final skim and making good.

    Possible, and perfectly fine so long as that risk is accepted and understood by the folk who want to do it that way.

    Are there rebars in the floor and are they being earthed ?

    Mike

  • 0 in reply to mapj1
    mapj1 said:
    There is nothing stopping you, regs wise, from burying a cable suited for direct burial, back filling with soft sand and all the rest,

    Except, as others have pointed out, Regulation 522.8.10 of BS 7671 requires a cable buried in the ground to either have an earthed metallic armour or similar, suitable for use as a protective conductor, or alternatively use metallic containment, or be installed in a a conduit or duct with appropriate mechanical protection.

    mapj1 said:
    DNOs do this all the time

    Agreed, but that cabling is not within the scope of BS 7671.

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  • 0 in reply to mapj1
    mapj1 said:
    There is nothing stopping you, regs wise, from burying a cable suited for direct burial, back filling with soft sand and all the rest,

    Except, as others have pointed out, Regulation 522.8.10 of BS 7671 requires a cable buried in the ground to either have an earthed metallic armour or similar, suitable for use as a protective conductor, or alternatively use metallic containment, or be installed in a a conduit or duct with appropriate mechanical protection.

    mapj1 said:
    DNOs do this all the time

    Agreed, but that cabling is not within the scope of BS 7671.

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