The different voltages that flow through your body when ungrounded

     

This video gives an excellent demonstration of the differing voltages that flow through your body depending on how close you are to electrical interference. It also shows how you can earth yourself and send all these excess voltages out of your body and to ground, simply by taking your shoes off. Interestingly, you will also see how asphalt road surfaces are not a grounding environment because they act as an insulator, whereas concrete is a good earthing substrate.

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