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DNO ducting requirements

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

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  • I am not sure if it is the last word but page 30 of this documen 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.

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  • I am not sure if it is the last word but page 30 of this documen 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.

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