Nema Publishes Ansi C84.1-2006, American National Standard For Electric Power Systems And Equipment-Voltage Ratings (60 Hertz)

ROSSLYN, VA, January 16, 2007-The National Electrical Manufacturers Association (NEMA) has published ANSI C84.1-2006, American National Standard for Electric Power Systems and Equipment-Voltage Ratings (60 Hertz).

This standard establishes nominal voltage ratings and operating tolerances for 60-hertz electric power systems above 100 volts. It also makes recommendations to other standardizing groups with respect to voltage ratings for equipment used on power systems and for utilization devices connected to such systems. ANSI C84.1-2006 includes preferred voltage ratings up to and including 1200 kV maximum system voltage.

In defining maximum system voltage, voltage transients and temporary overvoltages caused by abnormal system conditions such as faults, loads, and rejection are excluded. However, voltage transients and temporary overvoltages may affect equipment operating performance and may be considered in the individual product standards.

The standard was expanded to cover voltages from 230 kilovolts to 1200 kilovolts, and the requirements from the Institute of Electrical and Electronics Engineers, Inc., (IEEE) 1312, which covered these higher voltages, were incorporated into the C84.1 revision.

"This is a valuable standard for both electric utilities and electrical equipment manufacturers," said Daniel J. Ward, chairman of the Accredited Standards Committee on Preferred Voltage Ratings for AC Systems and Equipment, and principal engineer at Dominion Virginia Power. "My thanks go to the entire committee for undertaking the increased scope and delivering a much needed revision on schedule."

The contents and scope of ANSI C84.1-2006 may be downloaded free at NEMA's website at An electronic or hardcopy of the standard may be purchased for $56.00 by visiting NEMA's website, or by contacting IHS at (800) 854-7179 (within the U.S.), (303) 397-7956 (international), (303) 397-2740 (fax).

NEMA is the trade association of choice for the electrical manufacturing industry. 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, medical imaging, industrial, commercial, institutional, and residential applications. Domestic production of electrical products sold worldwide exceeds $120 billion. In addition to its headquarters in Rosslyn, Virginia, NEMA also has offices in Beijing, São Paulo, and Mexico City.


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