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DNO ducting requirements

Grumpy

I am in WPD area so the obvious answer is to ask them, I know. However I don't have time because in Cornwall it appears that a contractor is "stacked out" for months but will ring you on a Thursday saying they'll start on the following Monday. So, I am having extensive groundworks, new foul and storm drains all round the house and I thought I'd take the opportunity to throw in a new beefy submain to the garage. Hopefuly the SWA will arrive in time. The route of said submain would follow that of a new DNO supply to an annexe we hope to get planning for so it would seem to make sense to install a duct for the DNO. I'd be grateful for any pointers to the type of ducting and the depth that would be acceptable to WPD. The entire route is under a driveway/gravelled area. More to the point, will WPD accept a duct that has been previously installed? Many thanks.0

  • 0

    I am not sure if it is the last word but page 30 of this document  seems to suggest that

    "Rigiduct shall be used for LV and 11kV circuits, and “Emtelle” smooth walled uPVC type to BS EN50086-2-4: 1994 shall be used on 33, 66, 132 and 275kV circuits.All ducts shall be BLACK."

    Rigiduct is made by polypipe more on that here

    For their own works, I presume they'd be happy with similar installed by others to their own specs.  Much of that document relates to other voltages and other situations, and  I am amused to see that they are happy with up to 15 m of cable in ducts before de-rating.

    As you say, they are the final arbiter, but using their own documents as inspiration ought to be a good start.

    Mike.

  • 0

    That's brilliant Mike, thanks very much. Where did you unearth that? 

    I emailed WPD last night but I'm expecting the groundworks to be completed before I hear back so you've been a great help.

  • 0 in reply to Grumpy

    As it happens I do have shortcuts to some of the  technical pages of a few of the DNOs, as they tend to be not quite as similar as you may think, and sometimes they do move things around.  Ideally I'd still check in your position but it allows you to refine your question to
    " I'm intending to follow your own guidance in Company Directive  CA6A/7 Relating to the Installation of Underground Cables - see the link -
    is that OK?" rather than

    " I am not sure what to do.." and that may speed it  up a bit at their end.
    Mike.

  • 0

    Thanks for your help Mike. In fairness to WPD they have responded to both my email and application for new supply request today and have arranged a site visit for the end of the week. So hats off to them. The ducting requirements in their email where a little more specific than the document highlighted above so I'm going to wait for their pronouncements before proceeding further. Hopefully the groundworkers will still be here! Mind you, today they hit an underground spring so currently the hole for the treatment plant is a swimming pool.

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