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Steel Clad Building and High Voltage Overhead Cables.

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There is a modern sheet steel clad building nearby. It has what appears to be plastic covered steel sheets as exterior walls. It is used as a Scout Hut and can probably accommodate about 80 people for events. Running overhead are three high Voltage cables that feed local transformers, including the scout hut transformer which is on a pole nearby. The scout hut has two earth electrodes which connect to a part of the building and earth it. Although they are quite close together so may not really count as two in function.


Theoretically what would happen if one of the H.V. overhead cables came adrift and fell onto the roof of the building regarding risks?


This is a theoretical question relating to a real building but with a serious intention.


Thanks,


Z.


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  • 0
    They will be almost always be earthed well enough that 6000 odd volts to ground will fire the earth fault relay - any gaps of a few mm or thin layers of paint/corrosion  will just flash.

    Downed bare HV cables onto hedges etc are normally dead soon after landing.

    Note however than the modern trend is to fit insulation covered cable  or over sleeving  when renewing/repairing  higher risk sections of 11kV line


    (example is 6.1.3 in THIS doc) note that

    Although the covered conductor used in CCC lines is not an insulated conductor, the covering does provide some measure of protection against serious electric shocks and burning. This feature of CCC shall be considered when constructing or refurbishing lines in high risk areas (refer to Section 6.2). For example, CCC shall be used for 11kV or 33kV lines in the vicinity of a recreational site (eg fishing site) if the alternatives of undergrounding or diverting are not viable and the danger cannot be adequately managed by the installation of warning notices.




     


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  • 0
    They will be almost always be earthed well enough that 6000 odd volts to ground will fire the earth fault relay - any gaps of a few mm or thin layers of paint/corrosion  will just flash.

    Downed bare HV cables onto hedges etc are normally dead soon after landing.

    Note however than the modern trend is to fit insulation covered cable  or over sleeving  when renewing/repairing  higher risk sections of 11kV line


    (example is 6.1.3 in THIS doc) note that

    Although the covered conductor used in CCC lines is not an insulated conductor, the covering does provide some measure of protection against serious electric shocks and burning. This feature of CCC shall be considered when constructing or refurbishing lines in high risk areas (refer to Section 6.2). For example, CCC shall be used for 11kV or 33kV lines in the vicinity of a recreational site (eg fishing site) if the alternatives of undergrounding or diverting are not viable and the danger cannot be adequately managed by the installation of warning notices.




     


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