HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Blogs
Guest Blogs

Design Decisions: Choosing the Correct NEMA Enclosure

Page 1 / 2 Next >
View Comments: Newest First|Oldest First|Threaded View
William K.
User Rank
Platinum
Selecting a Nema enclosure
William K.   12/4/2013 11:35:16 PM
NO RATINGS
Both Hoffman and Rittal include good informationin their catalogs, at least they used to include it.

And I can easily imagine the aluminum of some types of buttons corroding away in justa few weeks of gulf salt spray. The problem is that not everybody advertises their non-corroding controls, and they do cost a lot more initially. 

Ann R. Thryft
User Rank
Blogger
Re: Good info
Ann R. Thryft   12/3/2013 12:03:04 PM
NO RATINGS
I agree, thanks for this excellent overview of NEMA enclosures.



Amclaussen
User Rank
Platinum
Heavily damaged panels.
Amclaussen   12/2/2013 12:36:58 PM
NO RATINGS
Probably, the worst panels I have seen ever, were at a couple of offshore platforms in Campeche Bay.  The panel components had suffered a terrible corrosion damage because of the marine atmosphere, but even worse: the pushbuttons had disintegrated completely, probably from UV light damage from the sun.  Selectors were completely stuck and couldn't be rotated at all.  All these damage was inflicted in less than two years of ambient exposition.

Those panels were to house the igniton system of the platform flare burner. Inside, we found that the ignition coil was too lightly constructed, and the manufacturer had placed a sticker (that was brown colored from oveheating) stating a Duty Cycle of only 30%, so that it required a cooling rest period after only two minutes of operation. I doubt the manufacturer did ANY calculations on temperatures inside the panel, that was a NEMA-7 Explosion-proof box, about 24" side square box.

Call that a completely "Monkeyish" design and execution.

naperlou
User Rank
Blogger
Good info
naperlou   12/2/2013 11:04:30 AM
NO RATINGS
Pat, thanks for the clearly written article.  This is an area I see often neglected. 

Partner Zone
More Blogs from Guest Blogs
FPGAs are the glue logic in today's systems, but what they glue together are a variety of diverse sub-systems with different interface requirements.
What should be the perception of a product’s real-world performance with regard to the published spec sheet? While it is easy to assume that the product will operate according to spec, what variables should be considered, and is that a designer obligation or a customer responsibility? Or both?
Procurement actually means well. There is no question that procurement can do a better job of phrasing their questions or making connections between engineering’s goals and the processes underway. And if you are using the right deciphering code, the result can live up to -- or surpass -- your expectations.
Internal combustion engines are ruling power generation applications even today, and improvising them to churn out every slice of power is still an area of research for the engineering community.
If you are interested in adding FPGA technology to you engineering toolkit, grab some free tools and an evaluation kit and get started on your own FPGA project. It never hurts to expand your engineering toolbox, and FPGAs are only going to become more popular over the next few years.
Design News Webinar Series
12/11/2014 8:00 a.m. California / 11:00 a.m. New York
12/10/2014 8:00 a.m. California / 11:00 a.m. New York
11/19/2014 11:00 a.m. California / 2:00 p.m. New York
2/25/2015 11:00 a.m. California / 2:00 p.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Jan 26 - 30, IPv6 for Micros – Hands-On
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  67


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Last Archived Class
Sponsored by Stratasys
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2015 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service