REG NASA-LLIS-0070-1992 Lessons Learned - 480 Volt Power Cable Connectors and Mating Tool Emergency Cut Off Device for the 480 Volt Power Cables.pdf

1、Lessons Learned Entry: 0070Lesson Info:a71 Lesson Number: 0070a71 Lesson Date: 1992-04-22a71 Submitting Organization: KSCa71 Submitted by: David PenningtonSubject: 480 Volt Power Cable Connectors and Mating Tool; Emergency Cut Off Device for the 480 Volt Power Cables Description of Driving Event: Du

2、ring routine operation of the portable purge unit (PPU), the 480 volt power cable connectors exploded and melted, causing the unit to shut down. The explosion was caused when the connectors overheated multi-point contact band caused the solder to melt, destroying the connectors Integrity. It is conf

3、irmed that the force of the explosion could seriously injure or kill personnel within a 50 radius.Lesson(s) Learned: 1. An overheated 480 volt/400 AMP power cable connector exploded and then burst into flames.2. The power cable connectors used to provide power to the portable purge unit (PPU) requir

4、e an excessive amount of force to mate them to the receptacles.3. During an explosion and fire of a 480 volt power cable connector, employees were not provided with a means to remove power from the cables.Recommendation(s): 1. Remove from service all similar connectors; dismantle and examine each fo

5、r evidence of debilitating anomalies and replace defective connectors.2. Design a special tool so that mating forces are applied uniformly with a reasonable amount of force.3. Install a method of disconnecting power to the 400 amp cable connectors provided for the portable purge unit (PPU) power cab

6、les.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): N/AAdditional Key Phrase(s): a71 Energya71 Hardwarea71 Packaging Handling Storagea71 Parts Materials & ProcessesAdditional Info: Approval Info: a71 Approval Date: 1994-06-02a71 Approval Name: James G. Klinea71 Approval Organization: KSC/HEIa71 Approval Phone Number: 407-867-7614Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-