NEMA and UL 50 Enclosure Type Ratings are accepted all over North America and referenced in the National Electric Code, NFPA, UL standards, and other product safety standards. F2 Labs can assist you with NEMA 250 testing and UL 50 testing, and the proper certifications for your products.
NEMA 250 Type Rating on an Enclosure states that the product is built with certain constructional and ingress protection properties which will provide protection to hazardous parts, against solid foreign objects, and against water. Unlike Ingress Protection (IP) ratings, type ratings found in NEMA 250 and UL 50E include corrosion testing, oil testing, construction requirements, material designations, and more.
[from NEMA 250-2008]
In Non-Hazardous Locations, the specific enclosure Types, their applications, and the environmental conditions they are designed to protect against when completely and properly installed are as follows: