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.
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Electrical Troubleshooting Quiz - August 19, 2014
Find out why an in-service motor fails every few weeks and the number of motors tagged by the insulation resistance trending program has gone up tenfold.