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    REG NASA-LLIS-0210-1992 Lessons Learned - High Voltage Electric Circuits.pdf

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    REG NASA-LLIS-0210-1992 Lessons Learned - High Voltage Electric Circuits.pdf

    1、Lessons Learned Entry: 0210Lesson Info:a71 Lesson Number: 0210a71 Lesson Date: 1992-11-13a71 Submitting Organization: LERCa71 Submitted by: G. MichalsonSubject: High Voltage Electric Circuits Description of Driving Event: A qualified high voltage electrician was injured when he cut into a 34,500 vol

    2、t cable that was thought to have been de-energized. The cable was located in a cable tunnel in the substation. The primary cause of the accident was the misidentification of the power cable. This was attributed to the fact that two of the cables had their identifying tags interchanged. Because maint

    3、enance personnel felt that they had the right cable identified, there was no attempt to determine by sounding devices, spiking, etc. that the cable they were about to cut was energized. The cable had been previously isolated and no further switching was felt to be deemed necessary.Lesson(s) Learned:

    4、 Injury from electrical shock and/or hardware damage can result if a circuit is energized while working on it.Recommendation(s): Use an active means such as a multimeter, hot stick, sounding devices, spiking, etc., to make a positive check / verification of a circuits de-energized state before worki

    5、ng on it.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Industrial Operationsa71 Safety & Mission AssuranceAdditional Info: Approval Info: a71 Approval Date: 1993-11-18a71 Approval Name: Maria Havenhilla71 Approval Organization: LERC/EBASa71 Approval Phone Number: 216-977-1483Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-


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