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Thread: Auxiliary Electrode

  1. #1
    Join Date
    Jun 2018
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    Richmond, VA
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    Auxiliary Electrode

    My question is from the following video : https://www.youtube.com/watch?v=YuDqXFvRv94

    if you have two electrodes at two different points that are bonded together and when lighting strikes, because of the voltage gradient you will have 100's and 1000's of volts between these two points which is highly dangerous.
    But doesn't the same thing apply where you have ground rod at one point and water pipes, building frames/concrete bars at a different point all bonded together ? Wont there be a huge potential between those two points ?

  2. #2
    Join Date
    Dec 2007
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    NE Nebraska
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    37,056
    Quote Originally Posted by mrkc949 View Post
    My question is from the following video : https://www.youtube.com/watch?v=YuDqXFvRv94

    if you have two electrodes at two different points that are bonded together and when lighting strikes, because of the voltage gradient you will have 100's and 1000's of volts between these two points which is highly dangerous.
    But doesn't the same thing apply where you have ground rod at one point and water pipes, building frames/concrete bars at a different point all bonded together ? Wont there be a huge potential between those two points ?
    With a lightning strike there could be differences in impedance of the path to each "point" which can create significant differences in potential between those points. That potential is only there during the lightning incident though and there is always large potential gradients around the area involved.

    For under 1000 volt applications - and with solid bonding the impedance is not significant enough to cause any noticeable differences in potential.
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