INJURED REMEMBERED THAT AFTER REPLACING THE BREAKER, HE ONLY PUSHED THE BREAKER BACK ON THE STABS IN THE CABINET & DIDN'T SECURE IT. HE BORROWED A LONG SCREWDRIVER BECAUSE HIS INSULATED SCREWD RIVER WASN'T LONG ENOUGH. HE TIGHTENED THE UPPER RIGHT HOLDING SCREW & WENT TO TIGHTEN THE UPPER LEFT HOLDING SCREW & APPARENTLY TOUCHED THE SCREWDRIVER TO THE LEFT CONTACT & IT SHOCKED HIM.