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Understanding Metric or IEC Motors

IEC and NEMA motors are designed and built based on standards from different organizations, but are intended for the same purposes. NEMA, the National Electrical Manufacturers Association, is the industry authority on electrical equipment manufacturing in the USA. On the other hand, international standards are established by IEC, the International Electrotechnical Commission. One of the main differences between both organizations is that IEC uses the Metric System of Measurement, while NEMA standards are based on the Imperial system.

This article will provide an overview on how the technical specifications of IEC motors differ from those that follow NEMA standards. For a given application, it is generally possible to find suitable motors ...