REG NASA-LLIS-1577-2005 Lessons Learned - Uninterruptible Power Supply (UPS) Hazards.pdf

1、Lessons Learned Entry: 1577Lesson Info:a71 Lesson Number: 1577a71 Lesson Date: 2005-10-06a71 Submitting Organization: GSFCa71 Authored by: Lisa CutlerSubject: Uninterruptible Power Supply (UPS) Hazards Abstract: The UPS was in a room that must be accessed by others for reasons other than UPS maintai

2、nence. Personnel cannot be expected to be aware of the presence of dangerous high voltage. Description of Driving Event: An employee was pulling new electrical cables through a newly installed conduit from a UPS room to the electrical vault in another location. He noted several strands of copper wir

3、e on the floor and picked the aire up to dispose of it. A strand of the copper came in contact with the metal trough on the battery rack, designed to collect any fluids from the lead-acid battery cells. His wrist came in contact with the metal doorknob and formed an electrical circuit between the wi

4、re in contact with the trough and the grounded doorknob. Electrical shock was the result. There were no injuries as a result of this shock. Lesson(s) Learned: UPS areas must been identified by signage and racks must be covered. UPSs should be located in dedicated rooms to prevent the potential for e

5、xposure to personnel. Recommendation(s): Ensure appropriate warning signage at all UPS facility entrances & provide barriers over/on the racks to prevent inadvertent contact. UPS systems should be located in dedicated rooms to eliminate the potential for exposure to personnel performing activities u

6、nrelated to UPS operations/maintenance. Evidence of Recurrence Control Effectiveness: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/ADocuments Related to Lesson: N/AMission Directorate(s): a71 ScienceAdditional Key Phrase(s): a71 FacilitiesAdditional Info: Approval Info: a71 Approval Organization: GSFCProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-