not me either, but my old instructor used to tell us about an aluminum rolling mill in his juristiction of which he had authority at the time. Electrician was screwing the 1900 blank cover back on to 277volt lighting j-box. shorted to ground. The ground-fault on the main had never been properly set so the main opened. Well this place needed an orderly shutdown. Equipment started fire and the whole place burnt to the ground.
Talk about sinking feeling. I imagine that one felt like falling into a bottomless pit.
