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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
Parents
  • 0
    No, getting out more is overrated, I love such knowledge.


    It also makes my mind wander to other related subjects. For example, London Underground's use of -210 and +420v, giving a total between 'simultaneously accessible parts' of 630v, just below the 650 cut off you mentioned (that I'd forgotten/retconned to 1000v).. is that similarity mere chance, or a way of skirting a higher safety requirement?
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  • 0
    No, getting out more is overrated, I love such knowledge.


    It also makes my mind wander to other related subjects. For example, London Underground's use of -210 and +420v, giving a total between 'simultaneously accessible parts' of 630v, just below the 650 cut off you mentioned (that I'd forgotten/retconned to 1000v).. is that similarity mere chance, or a way of skirting a higher safety requirement?
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