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

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 V.

03/01/2007


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 V. 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 V maximum system voltage. In defining maximum system voltage, transients and temporary overvoltages caused by abnormal system conditions such as faults, loads, and rejection are excluded. However, 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.”

www.nema.org/stds/c84-1.cfm





No comments
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by...
The System Integrator Giants program lists the top 100 system integrators among companies listed in CFE Media's Global System Integrator Database.
Each year, a panel of Control Engineering and Plant Engineering editors and industry expert judges select the System Integrator of the Year Award winners in three categories.
This eGuide illustrates solutions, applications and benefits of machine vision systems.
Learn how to increase device reliability in harsh environments and decrease unplanned system downtime.
This eGuide contains a series of articles and videos that considers theoretical and practical; immediate needs and a look into the future.
Additive manufacturing benefits; HMI and sensor tips; System integrator advice; Innovations from the industry
Robotic safety, collaboration, standards; DCS migration tips; IT/OT convergence; 2017 Control Engineering Salary and Career Survey
Integrated mobility; Artificial intelligence; Predictive motion control; Sensors and control system inputs; Asset Management; Cybersecurity
Featured articles highlight technologies that enable the Industrial Internet of Things, IIoT-related products and strategies to get data more easily to the user.
This article collection contains several articles on how automation and controls are helping human-machine interface (HMI) hardware and software advance.
This digital report will explore several aspects of how IIoT will transform manufacturing in the coming years.

Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

Infrastructure for natural gas expansion; Artificial lift methods; Disruptive technology and fugitive gas emissions
Mobility as the means to offshore innovation; Preventing another Deepwater Horizon; ROVs as subsea robots; SCADA and the radio spectrum
Future of oil and gas projects; Reservoir models; The importance of SCADA to oil and gas
Automation Engineer; Wood Group
System Integrator; Cross Integrated Systems Group
Jose S. Vasquez, Jr.
Fire & Life Safety Engineer; Technip USA Inc.
This course focuses on climate analysis, appropriateness of cooling system selection, and combining cooling systems.
This course will help identify and reveal electrical hazards and identify the solutions to implementing and maintaining a safe work environment.
This course explains how maintaining power and communication systems through emergency power-generation systems is critical.
click me