1、Lessons Learned Entry: 0258Lesson Info:a71 Lesson Number: 0258a71 Lesson Date: 1994-01-20a71 Submitting Organization: LERCa71 Submitted by: S. PapellSubject: Electrical Ground - U-Ground Description of Driving Event: While mounting a tray inside an instrument rack, the bottom lip of the tray made co
2、ntact with the prongs of an electrical plug located below the tray. This contact caused electrical sparks which cut a hole in the tray, burned the paint off the tray, and ruined the plug.In order to preclude this electrical hazard from recurring, it is recommended that all U-Ground devices be instal
3、led with the ground in the top position. If mounted horizontally, the neutral prong should be in the top position.Lesson(s) Learned: U-Ground electrical devices can cause electrical hazards if not installed properly.Recommendation(s): Install U-Ground devices with the ground in top position. But, if
4、 the device is mounted horizontally, the neutral prong should be on top.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/AProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Mission Directorate(s): N/AAdditional Key Phrase(s): a71 EnergyAdditional Info: Approval Info: a71 Approval Date: 1994-06-15a71 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-,-,-
