Don't know which sub-forum this topic belongs to so I'm sticking it in here. I'm currently at a temp job testing hot melt machines that powers from a 240v 3 phase source. Electrical safety was never really emphasized in engineering school. Is there a standard list of safety protocols or 'do and don't do' when handling high voltage equipment? For instance, the machine is chassis grounded. Is it safe to poke around while the machine is live?