What is the difference between IEC motors and NEMA motors?
The most obvious mechanical difference is that NEMA motors are defined in inch units and IEC are defined in metric units.
Beyond that, NEMA motors offer a wider range of motor enclosures (not common in the IEC designs) such as open-drip proof motors used in many compressor and fan applications.
IEC motors are commonly made with either finned cast aluminum or iron frames, while NEMA motors are made with finned cast frames and rolled steel frame housings. There are only slight differences in frame sizes based on shaft height. The shaft diameters and lengths are different between NEMA and IEC, as well as the mounting base dimensions and mounting hole spacing.
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