IP ratings and NEMA enclosure types

IP ratings according to EN / IEC 60529
First numeral Protection from solid objects Second numeral      Protection from water ingress
0 No special protection 0 No special protection
1 Objects > 50mm diameter 1 Vertically dripping water
2 Objects > 12.5mm diameter
2 Vertically dripping water when enclosure tilted by 15°
3 Objects > 2.5mm diameter
3 Sprayed water up to 60°
4 Objects > 1.0mm diameter
4 Sprayed water from all directions
5 Dust protected 5 Water jets
6 Dust tight 6 Powerful water jets

7 Temporary submersion to a depth of 1m
8 Extended submersion to a depth of  >1m
Enclosure types according to NEMA 250

Type of enclosure
1 2 3 3X 3R 3RX 3S 3SX 4 4X 5 6 6P 12 12K 13
Indoor use













Outdoor use















Protection against Access to hazardous parts














Ingress of solid foreign objects (falling dirt)














Ingress of solid foreign objects (windblown dust, lint, fibres and flyings)















Ingress of water (dripping, light splashing)














Ingress of solid foreign objects (circulating dust, lint, fibres and flyings)














Ingress of solid foreign objects (settling airborne dust, lint, fibres and flyings)














Ingress of water (hosedown and splashing water)















Oil and coolant seepage














Oil and coolant spraying and splashing















Corrosive agents















Ingress of water (occassional temporary submersion)















Ingress of water (occassional prolonged submersion)















Ingress of water (rain, snow and sleet)















External mechanisms operable when ice laden 















Approximate IP rating equivalent 20 22 55 55 24 24 55 55 66 66 52 67 68 54 54 54
Ingress protection / enclosure types 
EN and IEC standard 60529 defines a two-digit IP code. The first number the protection against solid objects and dust, the second number protection against water ingress.
How does the IP rating compare with NEMA enclosure types?
NEMA enclosure types follow a different system and they cannot be directly converted or compared to an IP rating. NEMA enclosure types can be approximately converted to IP rating but IP rating cannot be converted to NEMA enclosure types. Equipment may carry several NEMA ratings.