943130fd_What_are_NEMA_and_IP_ratings___NEMA_Definition
[NEMA Rating] 3S [IP Equivalent] IP54 [IP Definition (1st Number)] 5 = Protected against dust - Limited to ingress (no harmful deposit) [IP Definition (2nd Number)] 4 = Protected against water sprayed from all directions - Limited to ingress permitted. [NEMA Definition] 
Enclosures constructed for either indoor or outdoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment; to provide a degree of protection against falling dirt, rain, sleet, snow, and windblown dust; and in which the external mechanism(s) remain operable when ice laden.
What are NEMA and IP ratings?
NEMA Definition