from the department...
IP vs NEMA ?
Engineering and workplace issues. topic
Posted by Mark Hill on 15 May, 2002 - 3:50 pm
Hi all;

Can someone point me to a site that explains and compares IP and NEMA ?

Mark Hill

Posted by Anonymous on 16 May, 2002 - 11:47 am
Try here "":http://ww

Posted by Craig Simon on 16 May, 2002 - 12:11 pm
Hoffman Enclosures has a great discription of these and what each entails. You can find this at "":http://www.ho

Hope this helps

Craig Simon

Posted by Mark Hill on 17 May, 2002 - 5:23 pm
Thanks mjv
Your second link ( is a keeper !!


Posted by wlmostia on 17 May, 2002 - 1:43 pm
There is not direct correspondence but the Hoffman Enclosure catalog gives a good explanation. Their web site has the information under standards - ratings and classifications at -

Bill Mostia::

William(Bill) L. Mostia, Jr. P.E.
Partner, LLC
Worldwide excellence in dependable automation

Posted by Ranjan Acharya on 16 May, 2002 - 3:10 pm
I am assuming that you are referring to IEC 60529 / IEC 529 - Ingress Protection standard for electrical enclosures and devices refer to NEMA 250 for purely North American version. Also referred to as EN 60529.

Enclosures and devices receive a two-digit code; the first digit specifies the protection against solid bodies and the second digit specifies protection against liquids.

NEMA 250 ratings exceed equivalent IP ratings since additional protection such as coolants, oil, corrosion and hail is often included in any NEMA rating conversion is always approximate and IP should not be converted to NEMA.

For example, NEMA 4 enclosures can be used indoors or outdoors and offer protection to persons using the cabinets against the (according to a web site I read) effects of: falling and windblown particles of dirt, precipitation and water directed under pressure. A NEMA 4 cabinet can also withstand the formation of ice. NEMA 4X extends NEMA 4 to include some protection from corrosion. Approximately equivalent to IP55/IP56/IP66 (depending on whose web site you read).

I never like comparing the two. The end-user should make up their mind and either use all IP or all NEMA. There is no good way of going back and forth, so you should not try. Different enclosure manufacturers list different IP equivalents for the same NEMA rating, depending on the phase of the moon I suppose.


Posted by Mark Hill on 17 May, 2002 - 1:48 pm
Thanks Ranjan;

My intention is to purchase enclosures manufactured in Europe that are rated IP. I'd like some idea of the NEMA equivalent. Not exact details, just approximations

The Hoffman link provided by Bill Mostia and Craig Simon ( "":http://www.ho ) provides useful information, but the link to
"":http:/ / provided by "Anonymous"
is a good place to see these comparisons.

Thanks All !!

Mark Hill

Posted by Charlie Hummel on 17 May, 2002 - 4:44 pm
Hoffman has a nice comparison in their catalog appendix. It is also on their web site.
then select "Ratings and Classifications" and it pulls up a 6 page pdf file.

Posted by Anonumous on 22 May, 2002 - 1:00 pm
I agree with others that, it is better not to compare IP vs NEMA ratings. You can check out the following links where both show different comparisons. I feel end user is the best judge.


"" ;:

Posted by Anonymous on 17 March, 2005 - 12:50 pm

Posted by Randy Marek on 4 January, 2007 - 12:08 am
There is no one-to-one comparison, that being said this is a real world problem. Here is a link to Phoenix terminal block site pdfs which gives some guide lines and the second link is to NEMA's "A Brief Comparison of NEMA 250 and IEC 60529". atings.pdf

The one place that I have a different opinion than the list is NEMA-4X. The Phoenix chart show IP66 which will definitely work, but IP66 is suitable for submersion. I use IP65 which will is suitable for water spray. The difference between the IP and NEMA test is the size of the nozzle and the flow rates. So if you review the NEMA's article you can make up your own mind.

Posted by fred on 25 June, 2008 - 11:27 pm
Hi Mark,

Go to
I think the page can help you!


Posted by rhea on 26 July, 2008 - 1:31 am
Fred, thanks for the link... :)

Posted by Loren D., App. Eng. on 17 February, 2010 - 3:25 pm
there is no reference to IP65 in the chart on this link. I see numerous internet pages that say that IP's equivalent to Nema 4 is IP65... not IP56. 56, to me, does not seem comparable, as 65 would. Comments?

Posted by AHMED GHONEM on 19 October, 2008 - 5:41 am
Guide to NEMA and IEC Enclosure Ratings

Posted by Rasam Syamsudin on 22 October, 2008 - 1:11 am
Dear Hill,

If you have Standard Practice API 14FZ, please read Section 6.11 Electrical Enclosure on page 56 to 60. Maybe this standard can help you.


Posted by Edwin Martens on 10 March, 2009 - 6:00 am
Hello Mark, please look at this site maybe it will help.

Goodluck Edwin

Posted by Peter Brissette on 1 August, 2009 - 2:23 pm
I have combined some of the key points and also have both IP Ratings and Nema Ratings on the same page.

Posted by Anonymous on 10 August, 2011 - 5:59 am
Please find below the link to the Comparison between IP and NEMA

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