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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.


Parents
  • 0
    Regarding the "medium" HV line arrangement - it depends on if it is a main line with three (lines) phases or a residential line with a single HV (phase line) which feeds the residual pole transformer (providing 2 phase)  protected by a link type fuse. 


    In the later case the HV is the highest cable on the pole followed lower down with the two (110 volt) phases then the ground followed by cable and phone lines. 


    By the way depending on the distance from the  house to the HV line it provides shielding against lightening strokes, which being the lightening capital of the USA, there is usually hundreds a month, somewhere around our county .


    When the trees come down (usually oaks) they stretch the Al cables and they sometime snap -- it has happened twice to us, when wind speeds exceeded 100 mph.


    Peter Brooks MIET

    Palm Bay Florida USA
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  • 0
    Regarding the "medium" HV line arrangement - it depends on if it is a main line with three (lines) phases or a residential line with a single HV (phase line) which feeds the residual pole transformer (providing 2 phase)  protected by a link type fuse. 


    In the later case the HV is the highest cable on the pole followed lower down with the two (110 volt) phases then the ground followed by cable and phone lines. 


    By the way depending on the distance from the  house to the HV line it provides shielding against lightening strokes, which being the lightening capital of the USA, there is usually hundreds a month, somewhere around our county .


    When the trees come down (usually oaks) they stretch the Al cables and they sometime snap -- it has happened twice to us, when wind speeds exceeded 100 mph.


    Peter Brooks MIET

    Palm Bay Florida USA
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