Tom Bishop, PE
EASA Senior Technical Support Specialist

Outside of North America, IEC motors are ubiquitous and if not repaired are typically replaced with IEC equipment in most applications. Comparatively, the IEC motor population in North America is continually increasing, and there are two frequent scenarios when replacing an IEC motor. The first is relatively straightforward: replacing the IEC motor with an equivalent IEC motor. The other scenario is to consider replacing the IEC design motor with a NEMA design motor.

The information in this article provides comparisons of key characteristics of IEC and NEMA motors to aid in evaluating the potential simplicity or complexity of the IEC to NEMA design conversion. Further, if desired, the information may be used to evaluate a potential NEMA to IEC motor conversion. For clarity and simplicity, all dimensions are given in millimeters. Except for the NEMA service factor (SF) and IEC duty types (S1 to S10), there are many more similarities than differences between the IEC and NEMA motor standards.

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Categories: Technical topics, AC motors, Design/theory/application, Miscellaneous, Nameplates, Standards

Tags: Nameplate Motor nameplate Motor design IEC NEMA

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