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NEMA Motors and Generators Standard Adds New Efficiency Test for Air-Over Motors

03/6/2017 4:00PMSign-up to receive press releases.

ROSSLYN, Va.—Today, the National Electrical Manufacturers Association (NEMA) released a new efficiency test method for air-over (AO) motors as part of its MG 1 Motors and Generators standard.

Part 34: Air-Over Motor Efficiency Test Method, covers AO motors that operate in and are cooled by the airstream of a fan or blower that is not supplied with the motor, and whose primary purpose is providing airflow to an application rather than the primary purpose of cooling the motor. There are three temperature test procedures recognized by the NEMA Motors and Generators (1MG) Technical Committee.

"AO motors require special procedures to reach an appropriate temperature. These test procedures replace the temperature test portion of the applicable efficiency test method," said Tim Schumann service manager of SEW-Eurodrive, Inc., and chair of 1MG.

NEMA MG 1-2016 is available in hard copy for $484 and as an electronic download at no cost on the NEMA website. For those who previously purchased a copy of NEMA MG 1-2016, click here to receive Part 34 as a download at no cost.


The National Electrical Manufacturers Association (NEMA) represents nearly 325 electrical equipment and medical imaging manufacturers that make safe, reliable, and efficient products and systems. Our combined industries account for 370,000 American jobs in more than 6,100 facilities covering every state. These industries produce $124 billion in shipments and $42 billion in exports of electrical equipment and medical imaging technologies per year.

Press contact:
Tracy Cullen


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