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Buried ducts for medium voltage cables

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
  • Former Community Member
    0 Former Community Member
    Did it not used to be that over 250 but below 1kv was considered medium voltage?


    Almost there, the last time the Regs defined Medium Voltage was in the yellow 14th of 1974 where it was: "Normally exceeding 250 Volts but not exceeding 650 Volts, whether between conductors or any conductor and earth."


    The last amendment of the 14th (Brown, 1976) only defines Extra-low and Low.


    Regards


    BOD (who really ought to get out more!)
Reply
  • Former Community Member
    0 Former Community Member
    Did it not used to be that over 250 but below 1kv was considered medium voltage?


    Almost there, the last time the Regs defined Medium Voltage was in the yellow 14th of 1974 where it was: "Normally exceeding 250 Volts but not exceeding 650 Volts, whether between conductors or any conductor and earth."


    The last amendment of the 14th (Brown, 1976) only defines Extra-low and Low.


    Regards


    BOD (who really ought to get out more!)
Children
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