Ingress Protection NEMA & IEC
Ingress Protection NEMA & IEC
(OP)
The air cooled braking resistor for VFD is built in U.S and its ingress protection is 3R as per NEMS standard but sepcification requires IP56 for outdoor installation. 3R is equivalent to IP14 which is not suitable for outdoor installation. However, 3R is also for outdoor installation. I believe that there is different test environment for each standards. In order to make the customer understood, I'd like to have the followings.
3R is for outdoor installation actually ?
what is different test conditions between both codes ?
If 3R is not suitable for outdoor(specifially marine installation), how should it be protected for it. I think it is not good way to install it any enclosed space because it dissipate a lot of heat during braking phase.
3R is for outdoor installation actually ?
what is different test conditions between both codes ?
If 3R is not suitable for outdoor(specifially marine installation), how should it be protected for it. I think it is not good way to install it any enclosed space because it dissipate a lot of heat during braking phase.






RE: Ingress Protection NEMA & IEC
You should have no problem finding a description of the various NEMA categories on the internet.
RE: Ingress Protection NEMA & IEC
Here's a cut-and-paste text for your reference:
NEMA 250 - "Enclosures for Electrical Equipment (1000 Volts Maximum)"
IEC 60529 - "Degrees of Protection Provided By Enclosures (IP Code)"
RE: Ingress Protection NEMA & IEC
http://www.eng-tips.com/viewthread.cfm?qid=163194
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