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

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.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
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.
Big Data and IIoT value; Monitoring Big Data; Robotics safety standards and programming; Learning about PID
Motor specification guidelines; Understanding multivariable control; Improving a safety instrumented system; 2017 Engineers' Choice Award Winners
Selecting the best controller from several viewpoints; System integrator advice for the IIoT; TSN and real-time Ethernet; Questions to ask when selecting a VFD; Action items for an aging PLC/DCS
This digital report will explore several aspects of how IIoT will transform manufacturing in the coming years.
Motion control advances and solutions can help with machine control, automated control on assembly lines, integration of robotics and automation, and machine safety.
This article collection contains several articles on the Industrial Internet of Things (IIoT) and how it is transforming manufacturing.

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

Future of oil and gas projects; Reservoir models; The importance of SCADA to oil and gas
Big Data and bigger solutions; Tablet technologies; SCADA developments
SCADA at the junction, Managing risk through maintenance, Moving at the speed of data
Automation Engineer; Wood Group
System Integrator; Cross Integrated Systems Group
Jose S. Vasquez, Jr.
Fire & Life Safety Engineer; Technip USA Inc.
click me