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Microshocks from induced voltage

MG
Has anyone ever come across the requirement to earth a section of metallic fence to mitigate micro-shocks that may be induced by an overhead transmission line? I have looked online but there is no methodology or guidance value listed other than just "earth the fence".


Any info would be useful.


Thanks

Mike
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    We could argue that there may be an element of induction here, if a nearby conductor is carrying a heavy current. However I agree that capacitive coupling is probably the main factor.


    This reminds me of the days when I worked for the CEGB. Some one told me that ordinary neon mains tester screwdrivers were useless when one worked on a grid site; they glowed on anything metal that they touched. I tried it and sure enough this was the case - even when touched onto metal earthing strip going straight into the ground. I presume this is because a human body can capacitively couple to a high tension source just like anything metal, and the mains tester provides a path to earth in this case.


    Fluorescent tubes in buildings associated with high tension supplies often glow dimly in the dark when they are not switched on.
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  • 0
    We could argue that there may be an element of induction here, if a nearby conductor is carrying a heavy current. However I agree that capacitive coupling is probably the main factor.


    This reminds me of the days when I worked for the CEGB. Some one told me that ordinary neon mains tester screwdrivers were useless when one worked on a grid site; they glowed on anything metal that they touched. I tried it and sure enough this was the case - even when touched onto metal earthing strip going straight into the ground. I presume this is because a human body can capacitively couple to a high tension source just like anything metal, and the mains tester provides a path to earth in this case.


    Fluorescent tubes in buildings associated with high tension supplies often glow dimly in the dark when they are not switched on.
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