NEMA Ingress Protection Ratings

Two standards govern the ingress (entry) protection (IP) of equipment enclosures. These standards use rating systems to identify an enclosure’s ability to resist external environmental influences. The two standards are:
  • International Electrotechnical Commission (IEC)
  • National Electrical Manufacturer’s Association (NEMA)
IEC ratings are based on performance criteria similar to NEMA, with different interpretations of enclosure performance. You can read about the IEC ingress protection codes here.

NEMA Ingress  Protection Ratings
NEMA indicates an equipment enclosure’s degree of protection against various materials using the numbers 1–13. The numbers cover liquid, solid, and hazardous area requirements as indicated in the table below:
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