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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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    strictly it is not a recognised term in the world of IEC harmonsied standards,

    but  in the USA ANSI C84.1 defines medium voltage (MV) as being “a class of nominal system voltages greater than 1,000 V and less than 100 kV.” IEEE 141 (the Red Book) references ANSI C84.1 in recognizing the same voltage levels as the  MV range.

    The standard MV distribution voltages used in the United States are 4,160 V, 12,470 V, 13,200 -13,800 V, 24,940 V, and 34,500 V  (phase to phase voltages) for four-wire systems and 69,000 V for three-wire systems.
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  • 0
    strictly it is not a recognised term in the world of IEC harmonsied standards,

    but  in the USA ANSI C84.1 defines medium voltage (MV) as being “a class of nominal system voltages greater than 1,000 V and less than 100 kV.” IEEE 141 (the Red Book) references ANSI C84.1 in recognizing the same voltage levels as the  MV range.

    The standard MV distribution voltages used in the United States are 4,160 V, 12,470 V, 13,200 -13,800 V, 24,940 V, and 34,500 V  (phase to phase voltages) for four-wire systems and 69,000 V for three-wire systems.
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