HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
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
Latest Analysis
A small team of engineers has created a tackling dummy robot that's comparable to training with human players on the football field.
Several plastics and elastomers have come out recently for different parts of cars, as well as for multi-material medical devices and for onboard base station antenna components.
Work in embedding conductive materials into commercially available yarn could lead to energy textiles that store power for use.
A ball bearing developed for turbofan engines by FAG Aerospace of Germany and MTU Aero Engines could have other uses such as turbines, pumps, and gearbox stages.
Fifty-six-year-old Pasquale Russo has been doing metalwork for more than 30 years in a tiny southern Italy village. Many craftsmen like him brought with them fabrication skills when they came from the Old World to America.
More:Blogs|News
Design News Webinar Series
8/13/2015 11:00 a.m. California / 2:00 p.m. New York
6/25/2015 11:00 a.m. California / 2:00 p.m. New York
6/24/2015 11:00 a.m. California / 2:00 p.m. New York
9/10/2015 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.
Sep 14 - 18, Controlling Sensors Efficiently with MCUs
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 August 25-27:
Sponsored by MICROMO
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