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Why, when birds sit on transmission lines or current wires doesn’t get shock? 
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It’s true that if birds touch the single one line (phase or neutral) they don’t get electrical shock… if birds touch 2 lines than the circuit is closed and they get electrical shock. so if a human touch single one line (phase) then he doesn’t get shock if he is in the air (not touching – standing on the ground if he is standing on the ground then touching the line (phase) he will get a shock because the ground on what we standing is like line (ground bed – like neutral) । and in the most of electric lines the neutral is grounded. So that means that human who touch the line closes the circuit between phase and neutral. 
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