Your plant has long had an insulation resistance trending program for all critical motors and for most other motors above 20HP. With this program, motors that develop signs of insulation deterioration get replaced while they are still reliable. Very rarely does a motor actually fail while in service. That is, until about six months ago. Now it seems an in-service motor fails every few weeks. Not only that, the number of motors tagged by the insulation resistance trending program has gone up ...

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