1. Electric Shock and Death during Overhead Crane Entry Bell Installation Grave Accident Case in Manufacturing Sector 2010- 교육미디어 -1017

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3. When: May 7 (Wed.), 2008, 15:15 Where: No. 2 Ladle overhead crane rail of the mini mill, XX Steelwork located in Geumho-dong, Gwanyang-si Who: Victim, employee of XX Power Company, who was installing an entry bell at the overhead crane. Why: The victim was killed by electric shock when his hand came in contact with the live wire 220V switch connection terminals of the bell. Ⅰ Ⅰ Overview of Accident

4. Electric Shock and Death during Overhead Crane Entry Bell Installation Details of Accident On May 6 (Tue.), 2008, the victim was instructed to install an additional bell at No.2 ladle overhead crane of the mini mill in XX Steelwork. Entry bell: a bell installed at the overhead crane saddle; pressed when the overhead crane operator wishes to get into the crane to signal this to the crane driver. Need for an additional bell: an additional bell was required to enable operators to press the bell in the lower level; the additional bell connected with the existing bell. No. 2 ladle overhead crane: rated weight 150/40 tons, trolley bar power 6,600V (entry bell power 220V) At 11:00, the victim, Lee and Kwon turned off the ACB and locked it out in the power room within the overhead crane girder to prevent the overhead crane from starting. Ⅱ Ⅱ

5. Electric Shock and Death during Overhead Crane Entry Bell Installation Details of Accident Kwon returned to the office after locking the device out and the victim and Lee opened the existing entry bell cover placed at the overhead crane saddle and checked it to see if it was live and it was (220V). The entry bell cover was left open until the accident. At 15:12, the victim performed angle welding near the operating room entrance staircase to install a conduit pipe and headed to the overhead crane saddle. At 15:15 when Lee was walking around the overhead crane girder top to install a warning light, he found the victim lying on the ground and sent the victim to a hospital, but the victim died. When he was found, the victim was lying on the floor with his feet facing the rail and head facing the factory’s outer wall. Ⅱ Ⅱ

6. Electric Shock and Death during Overhead Crane Entry Bell Installation Details of Accident Ⅱ Ⅱ Accident situation Saddle Entry bell Ground trolley bar Rail

7. Electric Shock and Death during Overhead Crane Entry Bell Installation Details of Accident Ⅱ Ⅱ Power connection terminal of the entry bell switch Power connection terminal of the switch Entry bell Entry bell cover

8. Electric Shock and Death during Overhead Crane Entry Bell Installation Details of Accident Ⅱ Ⅱ Entry bell power supply wiring circuit breaker installed within the overhead crane operating room

9. Electric Shock and Death during Overhead Crane Entry Bell Installation Details of Accident Ⅱ Ⅱ Floor under the rail where the additional bell was to be installed

10. Electric Shock and Death during Overhead Crane Entry Bell Installation Details of Accident Reconstruction of electric shock accident The emergency room director of Sooncheon XX Hospital who conducted an autopsy on the victim’s body said that the victim’s coworkers had testified the victim had got an electric shock and the victim’s body had a trace of an electric shock at the index finger of his right hand. The contents of the autopsy report and the situations as clarified above shows that the victim’s right hand had contacted the switch power terminal while he was preparing to connect or connecting a cable to the existing entry bell. Ⅱ Ⅱ

11. Electric Shock and Death during Overhead Crane Entry Bell Installation Cause of Accident Failure to stop power supply Connecting the power supply cable of the additional entry bell should have been done after stopping the power supply to the existing bell. However, the work was done when the power supply was still on. Poor reaction when the risk factor was identified It was necessary to request the facility manager to stop the power supply after opening the bell cover and checking if the device is live with a detector and then checking again prior to starting work. However, the work continued when it was still live. The entry bell power supply circuit breaker was installed within the overhead crane operation room’s panel board. However, the panel board was locked and the victim was not able to turn off the circuit breaker. Ⅲ Ⅲ

12. Electric Shock and Death during Overhead Crane Entry Bell Installation Prevention of Accident Stop power supply Connecting the power supply cable of the additional entry bell should have been done after stopping the power supply to the existing bell. Prompt reaction when a risk factor is identified If a part is live and is likely to cause an electric shock, it is necessary to request the facility manager to stop the power supply and resume work after checking it again and ensuring it is not live when the facility manager’s confirmation is not available. Ⅳ Ⅳ

13. Electric Shock and Death during Overhead Crane Entry Bell Installation Prevention of Accident Clearly identify the section where the power supply should be stopped during the tool box meeting (TBM) (Recommendation) During the tool box meeting (TBM), potential risk with regard to electric shock were anticipated and turning off the power and posting safety signs were recommended. However, the actual power supply was stopped only at the operation part to prevent unwanted operation. When the power supply should be stopped due to a risk of electric shock, the precise section should be recorded in the safety minutes (safe operation report) and the power shut off at that section. Ⅳ Ⅳ

14. Electric Shock and Death during Overhead Crane Entry Bell Installation