54178de2_tings_and_IP_Equivalency_Chart__NEMA_Definition
[NEMA Rating] 1 [IP Equivalent] IP10 [IP Definition] 1 = Protected against solid foreign objects of 50mm in diameter and greater [4] 0 = Not Protected [NEMA Definition] 
Enclosures constructed for indoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment and to provide a degree of protection against falling dirt
Rugged Technologies - NEMA Ratings and IP Equivalency Chart
NEMA Definition