We had a comm system that had a ridiculous power level running through the long-run cables (miles through terrain) We were supposed to have a test set to know if the system was charged or not before we broke open a section to troubleshoot. Well we never seemed to have one or the thing was busted. so you would loosen the coupling then have two guys stand some 20 feet apart and yank the cable open. Blue lightening shooting into the sky. Pretty cool