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A Van de Graaff generator is an electrostatic generator which uses a moving belt to accumulate very high amounts of electrical potential on a hollow metal globe on the top of the stand.  It was invented by American physicist Robert J. Van de Graaff in 1929.  Wiki
Explanation: Charges are delivered to the upper dome of the Van de Graaff generator by a belt that's run by a motor.  The speed of the belt (and the width of the belt) is what limits the current.  In this case the belt physically can't deliver enough charges per second to be harmful.

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