When you receive a shock it is because you are touching 2 (or more) points that have different potentials (current) electricity is very similar to water in that it always wants to be level if you touch a cable with 240v and the ground which is 0v you get a shock of 240v. If you touch a cable at 240v and 230v you’ll only get a 10v, this is why you don’t get a shock when hanging from a cable both points of contact have the same potential.
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