? . .If you don't know what that is, may god help you.........
Worked on an industrial construction project where the head electrician was an electrical professor from the University of Oregon. When one of his guys was sent to the hospital for a couple of months after grounding out 480 volts with his screwdriver because someone told
him the breaker was shut off, I was drafted onto the crew to help out with some low voltage stuff.
My first lesson from the professor -- "When it comes to electricity, never trust anyone, not even God!