> the established threshold above which safety to humans starts to be a factor Specifically, 50 volts is approximately the threshold above which electricity ca

> the established threshold above which safety to humans starts to be a factor Specifically, 50 volts is approximately the threshold above which electricity can pass through the skin and shock you. Lower voltages will only shock humans if they have a way to bypass some of the skin, like wounds or tight-fitting metal jewelry. Otherwise, the resistance of skin is high enough to prevent the flow of electricity. That's why you can touch both terminals of a 12V car battery at the same time and almost certainly not be shocked.