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Electrical Troubleshooting Quiz — August 1, 2017

Motor insulation failures will recur when the cause is not identified.

A Pareto analysis of downtime causes (as identified by repair technicians) revealed something that is puzzling to the plant engineer. The following three causes, when added up, comprise about 90% of failures:

  1. Loose connections in control cabinet.
  2. Motor insulation failure.
  3. Wiring problems.

The third one is a broad category, so the plant engineer spoke with a few technicians who selected this cause on their repair report sheet. They said the ma

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