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Efficiency of Electric Motors LAP

Motor Efficiency

Eddy Current Dynamometer, rated 300 hp, 8000 rpm max speed, connected to 100 hp motor under test. 

Credit: Advanced Energy

The Efficiency of Electric Motors (EEM) laboratory accreditation program was originally developed at the request of the National Electrical Manufacturers Association (NEMA) to assist the electric motor industry in complying with the statutory requirements for electric motors in Section 431.36(a) of Title 10, Code of Federal Regulations (CFR) Part 431 (10 CFR Part 431). NVLAP coordinated the development of the EEM program with NEMA and the Department of Energy (DOE).

For information on the requirements of accreditation see NIST Handbook 150 which contains the general requirements for accreditation of laboratories. In addition, NIST Handbook 150-10 contains specific requirements for laboratories testing motors for energy efficiency.

Proficiency Testing Requirements

Section 7.7.2 of ISO/IEC 17025:2017 requires a laboratory “monitor its performance by comparison with results of other laboratories, where available and appropriate.” NVLAP is not aware of any widely available interlaboratory comparison for motor testing. Laboratories may choose to organize interlaboratory comparisons among themselves, but NVLAP does not require participation in interlaboratory comparison in the motors program. If an appropriate interlaboratory comparison becomes available, NVLAP may require participation and will notify all laboratories of requirements. 

Requirements Documents

References and Information



Created July 18, 2013, Updated March 29, 2024