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NASA-LLIS-0564
Lessons Learned –
Year: 1997
Abstract: Description of Driving Event:
An electrical mishap occurred on January 30, 1997, at the Water Deluge Pumping Substation 202 at the Cryogenic Transfer Area at the Stennis Space Center (SSC). Electrical Technicians were working under a Troubleshooting Incident Report (TIR) and standard operating procedures as required. The troubleshooting was necessary to determine why the "Run" indicating lights for Deluge Pumps No. 2 and No. 3 (of four) were reversed from actual pump operation.
While attempting to also check Pump No. 4, the mishap occurred when the technician jumpered terminals at a field wiring terminal block in the rear of the north switchgear section, believing they were the "Pump No. 4 Run" contact. An electric arc caused second degree burns on the hands and third degree burns to the left index finger of the technician. The arc occurred because the two terminals were a 480 VAC tap from the switchgear incoming bus. When the terminals were shorted with the jumper, fault current flowed, and the electric arc formed as the circuit was interrupted.
An electrical mishap occurred on January 30, 1997, at the Water Deluge Pumping Substation 202 at the Cryogenic Transfer Area at the Stennis Space Center (SSC). Electrical Technicians were working under a Troubleshooting Incident Report (TIR) and standard operating procedures as required. The troubleshooting was necessary to determine why the "Run" indicating lights for Deluge Pumps No. 2 and No. 3 (of four) were reversed from actual pump operation.
While attempting to also check Pump No. 4, the mishap occurred when the technician jumpered terminals at a field wiring terminal block in the rear of the north switchgear section, believing they were the "Pump No. 4 Run" contact. An electric arc caused second degree burns on the hands and third degree burns to the left index finger of the technician. The arc occurred because the two terminals were a 480 VAC tap from the switchgear incoming bus. When the terminals were shorted with the jumper, fault current flowed, and the electric arc formed as the circuit was interrupted.
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T16:26:41Z | |
| date available | 2017-09-04T16:26:41Z | |
| date copyright | 09/10/1997 | |
| date issued | 1997 | |
| identifier other | UBCEQCAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/89919 | |
| description abstract | Description of Driving Event: An electrical mishap occurred on January 30, 1997, at the Water Deluge Pumping Substation 202 at the Cryogenic Transfer Area at the Stennis Space Center (SSC). Electrical Technicians were working under a Troubleshooting Incident Report (TIR) and standard operating procedures as required. The troubleshooting was necessary to determine why the "Run" indicating lights for Deluge Pumps No. 2 and No. 3 (of four) were reversed from actual pump operation. While attempting to also check Pump No. 4, the mishap occurred when the technician jumpered terminals at a field wiring terminal block in the rear of the north switchgear section, believing they were the "Pump No. 4 Run" contact. An electric arc caused second degree burns on the hands and third degree burns to the left index finger of the technician. The arc occurred because the two terminals were a 480 VAC tap from the switchgear incoming bus. When the terminals were shorted with the jumper, fault current flowed, and the electric arc formed as the circuit was interrupted. | |
| language | English | |
| title | NASA-LLIS-0564 | num |
| title | Lessons Learned – | en |
| type | standard | |
| page | 3 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1997 | |
| contenttype | fulltext |