The figure that I am familiar with for average skin resistance is 5000Ohms. Divide that into 120 V and you have 24mA.(Divide it into 50 V and you get a tingle of 1mA.) Current path determines whether or not it is lethal. Electricians working things "hot" know how to keep a relatively safe current path in the event of an inadvertent screw-up. Just because you see electricians working hot doesn't mean it isn't dangerous. But let's not lose focus on the flash hazards. Drawing an unexpected arc can do serious damage to your eyes, or startle you off your ladder!
