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
In order to keep in line with safety protocols, industrial networks need to be filtered in a semantic way so that only information related to diagnostics is flowing back to the vendor and that any communications that could be used for remote machine operations are suppressed.
While people may talk about the procurement process, the procurement discipline actually encompasses a number of different processes. They include spend analysis, supplier relationship management, and contract management, just to name a few.
As the Industrial Internet of Things and machine-to-machine communications movements gain speed, some companies are asking themselves, “Wait. How much information do we really want to flow in and out of our premises? Aren’t we supposed to be doubling down on cyber security?”
To carry out the program, Boeing built five custom carriages using a custom, upgraded pneumatic rod lock system developed by Advanced Machine & Engineering Co.
Extruded aluminum continues to gain traction as a mainstream OEM choice for designing, engineering, and producing component parts. The alloy and the technique have marched aggressively through the awareness and understanding phases and are now solidly in adoption territory.
Design News Webinar Series
5/21/2015 11:00 a.m. California / 2:00 p.m. New York
5/7/2015 11:00 a.m. California / 2:00 p.m. New York
3/31/2015 11:00 a.m. California / 2:00 p.m. New York
6/11/2015 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.
Jun 8 - 12, Everything You Ever Wanted to Know about Filters
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6 |  7


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.
Next Course June 2nd-4th:
Sponsored by Proto Labs
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