EE WAS ENGAGED IN REPAIRING CIRCUIT BREAKER. WHEN PREPARING TO REINSTALL BREAKER, EE DID NOT WAIT FOR ESSROC PERSONNEL TO COMPLETELY DE-ENERGIZE THE EQUIPMENT. EE#2 REMOVED THE TIES SECURING THE FEED LINES AND ALLOWED THE ENERGIZED LINES TO FALL ON A METAL BRACKET CAUSING AN ELECTRICAL FAULT AND BURNING THE CONTRACTOR.