Feedback: Enclosure standards don't correlate

The table "NEMA and IEC enclosure comparison" shown in "Enclose as Needed" (CE, p. 58, March 2006; www.controleng.com/archive) could be construed by readers as a direct one-to-one correlation and interchangeability from IEC IP [ingress protection] Code-rated enclosures to NEMA Type-rated enclosures. No such direct conversion is possible.

06/01/2006


The table "NEMA and IEC enclosure comparison" shown in "Enclose as Needed" ( CE , p. 58, March 2006; www.controleng.com/archive ) could be construed by readers as a direct one-to-one correlation and interchangeability from IEC IP [ingress protection] Code-rated enclosures to NEMA Type-rated enclosures. No such direct conversion is possible. Many electrical inspectors in the U.S. who apply the National Electrical Code (NEC) will not approve installations where an enclosure has only an IP Code rating with no NEMA Type rating.

IEC IP Code only addresses requirements for protection of people, ingress of solid objects, and ingress of water. Many other requirements covered by NEMA Type standards that are not covered in the IEC IP Code, include construction requirements; door and cover securement; corrosion resistance; effects of icing; gasket aging and oil resistance; and coolant effects.

NEMA Type designation specifies requirements for these additional performance protections. For this reason, the IEC enclosure IP Code designations cannot be converted to NEMA enclosure Type numbers.

NEMA Standards Publication, "A Brief Comparison of NEMA 250 and IEC 60529," provides additional information and is available for free download from NEMA at www.nema.org .

James R. Reizner is with Corporate Engineering; Power, Controls and Information Systems, The Procter & Gamble Co., www.pg.com





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