Mine Safety and Health Administration Metal and Nonmetal Mine Safety and Health Report of Investigation: Surface Metal Mine (Mill). Fatal Electrical Accident, October 12, 2006. United Taconite, LLC, United Plant, Eveleth, St. Louis County, MN. Mine I.D. N

摘要

Andrew D. Reed, maintenance coordinator, age 24, was fatally injured on October 12, 2006, when an electrical short occurred in a ball mill starter circuit. Reed was troubleshooting an electrical problem in the motor ladder start-up sequence for the No. 4 ball mill electrical motors. An air-magnetic circuit breaker that provided over current protection to the circuit failed, resulting in a sustained arc-flash. The accident occurred because management failed to ensure that the air-magnetic circuit breaker provided over current protection for the electrical circuit. The failure to also provide circuit overload protection for the plants incoming power feed circuit also contributed to the accident.