Many times, one side of a power system will be intentionally connected to earth ground, and so the person touching a single wire is actually making contact between two points in the circuit (the wire and earth ground):
The ground symbol is that set of three horizontal bars of decreasing width located at the lower-left of ;
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:lang(fa) { direction: rtl; font-size: 100 the circuit shown, and also at the foot of the person being shocked. In real life the power system ground consists of some kind of metallic conductor buried deep in the ground for 0AErrPage making maximum contact with the earth. That conductor is electrically connected to an appropriate connection point on the circuit with thick wire.