Carl, I think the main reason to keep one hand in a pocket while working
around high voltage is to avoid an electrical path from both arms through the
heart, as well as limiting the ways one can get shocked. If one hand is
grounded and the other hand touches high voltage then the path through the
body goes right through the heart muscle increasing the risk of heart
failure. If the current went through one hand to ground through your leg at
least it wouldn't go through your heart muscle increasing your chances of
survival.
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