Higher voltage: NEMA expands standard to cover 230-1,200 V


Rosslyn, VA —The new upper limit is 1,200 V for National Electrical Manufacturers Association 's newly revised standard, (NEMA) ANSI C84.1-2006 , American National Standard for Electric Power Systems and Equipment—Voltage Ratings (60 Hz).

Revisions established nominal voltage ratings and operating tolerances for 60-Hz electric power systems above 100 V and expanded to cover voltages from 230-1,200 kV. Requirements from the Institute of Electrical and Electronics Engineers Inc ., (IEEE) 1312, covering these higher voltages, were incorporated. 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 1,200 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.

'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.' Click here to download the contents and scope of ANSI C84.1-2006 for free at NEMA's Website.

Control Engineering Daily News Desk
Edited by Mark T. Hoske , editor in chief

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