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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
    Hi OMS. Your one are all valid considerations. 

    I wondered if for multi layer arrangements of ducts - in addition to right space between ducts and right backfill materials to be used - there where also particular considerations to carry out in terms of mechanical stresses. 

    For example, one duct could be buried at X m depth under carriageway, but in case of a multilayer arrangement (e.g.3 x 3) then the shallowest row of ducts should be deeper then X m? Hence my question about  typical arrangements..
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  • 0
    Hi OMS. Your one are all valid considerations. 

    I wondered if for multi layer arrangements of ducts - in addition to right space between ducts and right backfill materials to be used - there where also particular considerations to carry out in terms of mechanical stresses. 

    For example, one duct could be buried at X m depth under carriageway, but in case of a multilayer arrangement (e.g.3 x 3) then the shallowest row of ducts should be deeper then X m? Hence my question about  typical arrangements..
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