May 4, 2010 - The National Electrical Manufacturers Association (NEMA) has published MG 1-2009 Motors and Generators. MG 1 is the definitive standard for practical information concerning performance, safety, testing, construction, and manufacture of alternating-current and direct-current motors and generators. The standard, which was last revised in 2007, is produced by NEMA’s Motor and Generator Section.MG 1 has been updated to include the latest in international motor efficiency requirements; the section revised the motor efficiency tables for 50 Hz products to reflect those of IEC IE Code as per IEC 60034-30.
Other significant changes include revised minimum insulation resistance; clarification of motor efficiency values; and the addition of sections on auxiliary devices, ratings tests, and performance for ac and dc motors. To increase the publication’s utility and readability, MG 1-2009 also includes a summary of changes for the current revision as well as the three previous editions, with color-coded lines throughout the document to mark affected sections. “NEMA members continually work to keep MG 1 updated for manufacturers and users of motors and generators to match changes in technology and the global marketplace,” said Roger Daugherty, PhD, of Baldor Electric Company, chair of the Motor & Generator Technical Committee.
“This latest revision represents significant industry expertise and time dedicated to the pursuit of standardization. We have also increased our efforts to mark technical modifications between revisions to assist readers with tracking the standard’s journey.”NEMA is the association of electrical and medical imaging equipment manufacturers.
Founded in 1926 and headquartered near Washington, D.C., its approximately 450 member companies manufacture products used in the generation, transmission and distribution, control, and end use of electricity. These products are used in utility, industrial, commercial, institutional, and residential applications. The association’s Medical Imaging & Technology Alliance (MITA) Division represents manufacturers of cutting-edge medical diagnostic imaging equipment including MRI, CT, x-ray, and ultrasound products.
Worldwide sales of NEMA-scope products exceed $120 billion. In addition to its headquarters in Rosslyn, Virginia, NEMA also has offices in Beijing and Mexico City.