Remember that most injuries associated with electric
shock are secondary -
that is, the real damage often occurs when the individual recoils from the
shock, jamming their hands into even worse places in the equipment - like
rotating assemblies. And then there's the innocent guy behind you, who gets
knocked into his equipment, when you jump back.
An obvious example of this is the the charge stored on the 'capacitor' of a CRT
(the capacitor being formed by the final anode coating inside the glass flare and
the coating on the outside) is not likely to be lethal for most people. But it will
you jump, you will then either drop the CRT (if you are carrying it) or jerk back
and break the CRT with whatever tool you are holding. And then the CRT
implodes, you get showered in glass....
-tony