How many volts of energy can a human body survive?
It is not the voltage that is of danger to humans, but the amount of current that will pass through the body as a result. Read on...
Under conditions of very low current, a person can easily withstand tens or hundreds of thousands of volts with relatively little discomfort. The images you see of children holding the large globe of a van de Graaf generator while their hair stands on end is proof of this.
This is because in these situations, the amount of available charge, and as a result the amount of current passing through the body is very low, and no damage to tissue results
However, when a large supply of charge is available, and as a result, larger currents can pass through the body, the damage to tissue and organs can be severe.
Check out this document for more detail:
or for something a little deeper, tyr this one:
As you see in this papers, as little as 0.01 amp causes involuntary muscle spasms, while ventricular fibrillation can result from as little as 0.030 amp!