NEMA releases two standards on A.C. power drive systems

Apr 15, 2005

NEMA, The National Electrical Manufacturers Association, has released two standards that are adaptations from IEC standards: ICS 61800-2-2005, Adjustable Speed Electrical Power Drive Systems, Part 2: General Requirements-Rating Specifications for Low Voltage Adjustable Frequency A.C. Power Drive Systems, and ICS 61800-4-2004, Adjustable Speed Electrical Power Drive Systems: Part 4: General Requirements-Rating Specifications for A.C. Power Drive Systems Above 1000 V A.C. and not Exceeding 35 kV.
Both documents contain amendments to identify those specifications in the original IEC standard that are not applicable in the United States. They also incorporates those additional requirements necessary to conform to the generally accepted wiring practices and rules for use of such equipment in the United States.
ICS 61800-2 addresses performance requirements only; safety requirements are contained in other documents. Both standards contain tutorial information and terminology to enable practical application of these devices. The standards specifically addresses line harmonics and motor considerations.

"This standard replaces material that was in other NEMA publications. It is important to align the subject matter in a uniform outline with the IEC standards, while maintaining the requirements pertinent to the use of these units in the U.S.," says Jim Armes, chairman of NEMA's Adjustable Speed Drives technical committee. "The national differences are the result of existing established practices."
ICS 61800-2 may be purchased for $105.00 by visiting; ICS 61800-4 may be purchased for $123.00 by visiting, or by contacting Global Engineering Documents at (800) 854-7179 (within the U.S.), (303) 397-7956 (international), or (303) 397-2740 (fax).
NEMA is the leading trade association in the United States representing the interests of electroindustry manufacturers.  Founded in 1926 and headquartered near Washington, D.C., its 400 member companies manufacture products used in the generation, transmission and distribution, control, and end-use of electricity.  Domestic shipments of electrical products within the NEMA scope exceed $100 billion.