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A Simple Approach to Duty Ratings of AC Machines

  • August 2021
  • Number of views: 832
  • Article rating: No rating

Matthew Conville, P.E.
EASA Technical Support Specialist

When we consider putting a machine into service, we must consider the duty rating of the machine. If we do not, there is a good chance that the machine being placed into service will have thermal degradation of the windings. Not every application is created equal. For example, a crane motor doesn’t need the same duty rating as a punch press motor that runs continuously, even though they may have the same horsepower ratings. Likewise, a chop saw motor wouldn’t need to have the same duty rating as a pump motor where the pump is operated continuously.

Topics discussed are:

  • NEMA MG1-1.40 and IEC 60034-1, 4
  • Turndown ratio
  • "S" ratings
  • Questions to consider

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