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Buried ducts for medium voltage cables

vici
Hello everyone,


Is there any BS or IEC standard indicating typical configurations for multiple ducts buried in the ground? This is mainly in relation to medium voltage cables.


Specifically, I wondered if there was a standard giving guidance on typical arrangements used for multiple ducts to be laid in the ground (e.g ducts arrangement like 3 x 5 or 4 x 4) and backfilling material requirements (e.g. ducts surrounded by concrete or other back fill materials etc..). I am aware of all the minimum depths form the ground level, depending on the conditions (e.g. carriageways, footways, arable land etc..) but I wondered if there were also indications from BS or IEC documents for typical layouts / engineering solutions.


thank you
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  • 0
    Yes, the London underground  voltage is totally arbitrary, actually  the same 630v trains run off 750v where they share track with British rail, and there is a plan to uprate the Metropolitan line to 750V along the full length, as a 250-0-500 DC supply in any case to improve the ohmic loss situation and allow heavier loads on the same network with the same spacing of feed points.

    I think the proposal was to do the Met first, and then the rest a line at a time.


    Actually as heavier loads for vehicle chargers and so on become more common,  as well as considerations of distribution losses move up the environmetal agenda (remember all that Baryonic centre stuff in the last draft of the regs) I rather think we could do to have at least one  additional final distribution  tier  between 690/400 (that is not quite man enough for large loads, and limited to moderate  ranges) and the rather serious 11/7kV that comes with rather too much attendant risk, and the corresponding procedural restrictions about who can use it.

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  • 0
    Yes, the London underground  voltage is totally arbitrary, actually  the same 630v trains run off 750v where they share track with British rail, and there is a plan to uprate the Metropolitan line to 750V along the full length, as a 250-0-500 DC supply in any case to improve the ohmic loss situation and allow heavier loads on the same network with the same spacing of feed points.

    I think the proposal was to do the Met first, and then the rest a line at a time.


    Actually as heavier loads for vehicle chargers and so on become more common,  as well as considerations of distribution losses move up the environmetal agenda (remember all that Baryonic centre stuff in the last draft of the regs) I rather think we could do to have at least one  additional final distribution  tier  between 690/400 (that is not quite man enough for large loads, and limited to moderate  ranges) and the rather serious 11/7kV that comes with rather too much attendant risk, and the corresponding procedural restrictions about who can use it.

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