Good point... Classic computer PSUs will often supply over 100A on the 5V line (that's only 500W, after all), and that is enough to melt jewellery, etc. High voltage, high current is, of course, the worst. A place I worked at had a very nice bench PSU that could output 0-300V, 0-10A (no, that's not a typo). It was very useful for sorting out SMPSUs, because you could set the current limiter low enough to prevent major damage if the chopper went short-circuit or whatever. But that PSU had enough power behind it to do serious damage to you if you weren't careful with it. When working on high voltages, I am torn between working alone (and not having someone to switch the power off if I do something stupid), and having somebody there to turn the power off in an emergency, who is, alas, more than likely to be the cause of said emergency. That sounds like about half mains voltage. It wasn't that one of the grounds was disconnected, and you got that voltage from the mains filters of all your hardware acting as capacitive dividers, was it? I've seen the same thing said about fire (a problem if you're stuck in a burning building, a great help when used for heating, cooking, running heat engines, etc), friction (normally regarded as a waste of energy, but without it, screws and nails would fall out, brakes wouldn't work, etc), electrcial resistance (again often thought of as a waste of energy, but without it, you could have no votlage differences, so electronics would be impossbile), etc. -tony