EE WAS ENGAGED IN REPAIRING A CIRCUIT BREAKER. WHEN PREPARING TO REINSTALL BREAKER, EE DID NOT WAIT FOR ESSROC PERSONNEL TO DE-ENERGIZE THE ELECTRICAL EQUIPMENT. EE REMOVED THE TIES SECURING THE FEED LINES AND ALLOWED THE ENERGIZED LINES TO FALL ON METAL BRACKET, CAUSING AN ELECTRICAL FAULT AND BURNING THE CONTRACTOR