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Multiple pilot cables in one duct

vici
Hi everyone,


I wondered if there are any issues in installing more than one pilot cable in a duct and I would like to seek advice on standards and good practice to follow. Pilot cables in questions are of copper type, for 11kV circuits.

I'd be tempted to think about criticalities in cable pulling, but I wondered if there are additional considerations to add.


Thank you

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  • Former Community Member
    0 Former Community Member
    It's not that unusual to see the protection scheme pilot wires installed in a common duct (usually with a small separation (say 300mm) from the MV cable group. After all, we don't really have any trouble with running multiple pilot cores within the same cable sheath/screen.


    Provided the cabling is adequately robust, and is designed for protection schemes (ie typical 2kV voltage withstand and enhanced insulation at the HV termination cubicles, the I wouldn't have any issues about running a group of pilots together for say line diff protection, or fail to trip signalling. The pilots are generally monitored as part of the trip supervision scheme anyway.


    Obviously, all the practical arrangements for drawing several cables into a duct will need to be followed. The last one I specified had a "square" duct with multiple sub ducts present so I could easily arrange installation of a multicore pair and triple cable in some of the sub ducts as well as optic fibre for other elements of the protection scheme


    Regards


    OMS
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  • Former Community Member
    0 Former Community Member
    It's not that unusual to see the protection scheme pilot wires installed in a common duct (usually with a small separation (say 300mm) from the MV cable group. After all, we don't really have any trouble with running multiple pilot cores within the same cable sheath/screen.


    Provided the cabling is adequately robust, and is designed for protection schemes (ie typical 2kV voltage withstand and enhanced insulation at the HV termination cubicles, the I wouldn't have any issues about running a group of pilots together for say line diff protection, or fail to trip signalling. The pilots are generally monitored as part of the trip supervision scheme anyway.


    Obviously, all the practical arrangements for drawing several cables into a duct will need to be followed. The last one I specified had a "square" duct with multiple sub ducts present so I could easily arrange installation of a multicore pair and triple cable in some of the sub ducts as well as optic fibre for other elements of the protection scheme


    Regards


    OMS
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