SWA set in concrete? w/pic

Discussion in 'Electrics UK' started by Multiplex, 6 Jul 2005.

  1. Multiplex

    Multiplex

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    I've got an SWA cable being put down under my patio, which happens to be quite low and needs to be built up on a bed of concrete, with a sand/cement mix going on top.

    I've already found a previous post that mentioned concrete has corrosive type effects on SWA cable, so I'm just wondering how to do this? If it's not okay to lay SWA in a concrete mix, is it okay to lay SWA within a sand/cement mix instead?

    [​IMG]

    The picture shows the SWA coming out in a mix of stones. This is where the concrete bed was going to be poured over.

    Thanks,

    Simon.
     
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  3. mingmong

    mingmong

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    Why not run the swa in a length of pvc conduit? then if needs be you can remove/replace the cable.
    ;)
     
  4. Multiplex

    Multiplex

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    Because the cable comes up vertically and PVC conduit cannot bend very easily.

    I need a proper reply please regarding concrete and SWA.

    Simon.
     
  5. breezer

    breezer

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    yes it does

    i thought it was a reasonable reply.

    as i said plastic conduit bends very easily, only thing is, dont think yor cable will fit easily down a20mm conduit

    try push fit waste pipe instead
     
  6. Multiplex

    Multiplex

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    Fair enough...will give it a go then!

    Simon.
     
  7. mapj1

    mapj1

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    Any exposed sections you might worry about could just be tape wrapped. (gaffer tape or similar) Mind you, I'm not aware of SWA and cement, even with strong lime mortars, having any deleterious effect.
     
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  9. mingmong

    mingmong

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    Sorry if my answer did not live up to your expectations Simon :cry:

    Maybe some planning "before the job" and you might not have to resort to getting "proper" replies!!!! :)
     
  10. Multiplex

    Multiplex

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    Found some flexible 20mm conduit. Here's the finished job, before the concrete goes down:

    [​IMG]

    Simon.
     
  11. pdcelec

    pdcelec

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    God help the bloke who comes to dig out the concrete in twenty years time
     
  12. mapj1

    mapj1

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    He'll see the box on the wall, and lift that slab first. Not really a problem as the cable route is visible.
     
  13. ryanj

    ryanj

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    I don't see why you couldn't have just kept it buried until it needs to rise to the wall.

    And I can't see any warning tape near the top of the cable, unless you've been neat with it's burial.
     
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