I learned when a teenager that you need to make sure the power is OFF! OFF! OFF! before messing with high-voltage, high-current circuits. I saw a large screwdr

I learned when a teenager that you need to make sure the power is OFF! OFF! OFF! before messing with high-voltage, high-current circuits. I saw a large screwdriver shaft blown in half when my father thought the power was cut. I have managed to avoid getting any significant shocks in the thirty years since.