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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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    Peter Brooks:

    Personal observation here in my residual area: When tree branches are blown against the HV line it just arcs and the line remains active.


    Also squirrels when closing the circuit between the tree and the HV line just get fried and again the line stays active.




    Both effects are because most parts of the USA (outside of calif) use the distributed neutral on the HV side, so a fault to earth appears as a normal load to the supply.


    In the UK, any current flowing to the star point is fault current or leakage. (as mentioned upthread).


    The squirrel would still be dead however.

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  • 0

    Peter Brooks:

    Personal observation here in my residual area: When tree branches are blown against the HV line it just arcs and the line remains active.


    Also squirrels when closing the circuit between the tree and the HV line just get fried and again the line stays active.




    Both effects are because most parts of the USA (outside of calif) use the distributed neutral on the HV side, so a fault to earth appears as a normal load to the supply.


    In the UK, any current flowing to the star point is fault current or leakage. (as mentioned upthread).


    The squirrel would still be dead however.

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