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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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    I am not aware of any formal guidance, but if electric shocks are being felt, then earthing the fence seems sensible.

    An all metal fence such as chainlink secured to metallic uprights will almost certainly be fortuitously earthed sufficiently to avoid shocks.

    A greater risk is dry wooden uprights with plain or barbed wire secured to them. The currents involved are minute and no elaborate precautions are required. An offcut of fencing wire twisted around the top two strands of the fence and with the loose end buried will normally suffice. The lower strands are generally a bit more earthy due to long grass and the supports being damp nearer the bottom.


    It might be prudent to investigate and ensure that the shocks are indeed due to capacitive* coupling from a grid line. Not for example diverted neutral currents or similar faults in a nearby LV consumers installation.


    *Often called "induction", but strictly speaking it is capacitive coupling.
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  • 0
    I am not aware of any formal guidance, but if electric shocks are being felt, then earthing the fence seems sensible.

    An all metal fence such as chainlink secured to metallic uprights will almost certainly be fortuitously earthed sufficiently to avoid shocks.

    A greater risk is dry wooden uprights with plain or barbed wire secured to them. The currents involved are minute and no elaborate precautions are required. An offcut of fencing wire twisted around the top two strands of the fence and with the loose end buried will normally suffice. The lower strands are generally a bit more earthy due to long grass and the supports being damp nearer the bottom.


    It might be prudent to investigate and ensure that the shocks are indeed due to capacitive* coupling from a grid line. Not for example diverted neutral currents or similar faults in a nearby LV consumers installation.


    *Often called "induction", but strictly speaking it is capacitive coupling.
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