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NASA-LLIS-2696
Lessons Learned – Substation Arc Flash Mishap
Year: 2010
Abstract: Abstract:
On Monday, September 24, 2007, at approximately 12:50 pm Central Daylight Time (CDT), a worker suffered second degree burns to the hands as a result of exposure to an electrical arc flash. The arc flash was caused by an electrical short while servicing a kilowatt-hour meter; located at Stennis Space Centers Test Complex Area Building 4400. Since Worker 1 was hospitalized for inpatient care within 30 days of the incident, the incident was classified as a Type B Mishap in accordance with NPR 8621.1B, reference NASA IRIS incident number 2007-267-00006.
The proximate (direct) causes leading to the mishap are listed below:
1. Meter Panel Assembly (MPA) being serviced by the worker was in an electrically energized state
2. Worker 1 opened MPA knife switches in preparation to review the kilowatt meter
3. Energized knife switch blades extended beyond plane of MPA cover opening
4. Worker 1 was not wearing leather protected, voltage rated gloves (PPE)
5. Worker 1 was not being monitored by another worker (i.e. buddy system)
6. Worker 1 placed metal MPA cover back onto the MPA enclosure
7. Metal MPA cover contacted the electrically energized knife switch blades causing electrical arc flash at MPA
On Monday, September 24, 2007, at approximately 12:50 pm Central Daylight Time (CDT), a worker suffered second degree burns to the hands as a result of exposure to an electrical arc flash. The arc flash was caused by an electrical short while servicing a kilowatt-hour meter; located at Stennis Space Centers Test Complex Area Building 4400. Since Worker 1 was hospitalized for inpatient care within 30 days of the incident, the incident was classified as a Type B Mishap in accordance with NPR 8621.1B, reference NASA IRIS incident number 2007-267-00006.
The proximate (direct) causes leading to the mishap are listed below:
1. Meter Panel Assembly (MPA) being serviced by the worker was in an electrically energized state
2. Worker 1 opened MPA knife switches in preparation to review the kilowatt meter
3. Energized knife switch blades extended beyond plane of MPA cover opening
4. Worker 1 was not wearing leather protected, voltage rated gloves (PPE)
5. Worker 1 was not being monitored by another worker (i.e. buddy system)
6. Worker 1 placed metal MPA cover back onto the MPA enclosure
7. Metal MPA cover contacted the electrically energized knife switch blades causing electrical arc flash at MPA
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T17:09:20Z | |
| date available | 2017-09-04T17:09:20Z | |
| date copyright | 06/11/2010 | |
| date issued | 2010 | |
| identifier other | YMQKSCAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/132824 | |
| description abstract | Abstract: On Monday, September 24, 2007, at approximately 12:50 pm Central Daylight Time (CDT), a worker suffered second degree burns to the hands as a result of exposure to an electrical arc flash. The arc flash was caused by an electrical short while servicing a kilowatt-hour meter; located at Stennis Space Centers Test Complex Area Building 4400. Since Worker 1 was hospitalized for inpatient care within 30 days of the incident, the incident was classified as a Type B Mishap in accordance with NPR 8621.1B, reference NASA IRIS incident number 2007-267-00006. The proximate (direct) causes leading to the mishap are listed below: 1. Meter Panel Assembly (MPA) being serviced by the worker was in an electrically energized state 2. Worker 1 opened MPA knife switches in preparation to review the kilowatt meter 3. Energized knife switch blades extended beyond plane of MPA cover opening 4. Worker 1 was not wearing leather protected, voltage rated gloves (PPE) 5. Worker 1 was not being monitored by another worker (i.e. buddy system) 6. Worker 1 placed metal MPA cover back onto the MPA enclosure 7. Metal MPA cover contacted the electrically energized knife switch blades causing electrical arc flash at MPA | |
| language | English | |
| title | NASA-LLIS-2696 | num |
| title | Lessons Learned – Substation Arc Flash Mishap | en |
| type | standard | |
| page | 3 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;2010 | |
| contenttype | fulltext |