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NEMA/IEC Enclosure Ratings
Conversion
of NEMA type classifications to IEC classification designation (IP ratings)
Note: NEMA standards meet or exceed IEC standards; therefore, the conversion
does not work in the opposite direction.
| NEMA |
NEMA definition |
IEC |
| enclosure |
enclosure |
| type no. |
class |
| 1 |
General-purpose. Protects against dust, light, and indirect
splashing but is not dust-tight; primarily prevents contact with live parts;
used indoors and under normal atmospheric conditions. |
IP10 |
| 2 |
Drip-tight. Similar to Type 1 but with addition of drip shields;
used where condensation may be severe (as in cooling rooms and laundries). |
IP11 |
| 3 and 3S |
Weather-resistant. Protects against weather hazards such as rain
and sleet; used outdoors on ship docks, in construction work, and in tunnels
and subways. |
IP54 |
| 3R |
Intended for outdoor use. Provides a degree of protection against
falling rain and ice formation. Meets rod entry, rain, external icing, and
rust-resistance design tests. |
IP14 |
| 4 and 4X |
Watertight (weatherproof). Must exclude at least 65 GPM of water
from 1-in. nozzle delivered from a distance not less than 10 ft for 5 min.
Used outdoors on ship docks, in dairies, and in breweries. |
IP56 |
| 5 |
Dust-tight. Provided with gaskets or equivalent to exclude dust;
used in steel mills and cement plants. |
IP52 |
| 6 and 6P |
Submersible. Design depends on specified conditions of pressure
and time; submersible in water; used in quarries, mines, and manholes. |
IP67 |
| 7 |
Hazardous. For indoor use in Class I, Groups A, B, C, and D
environments as defined in the NEC. |
|
| 8 |
Hazardous. For indoor and outdoor use in locations classified as
Class I, Groups A, B, C, and D as defined in the NEC. |
|
| 9 |
Hazardous. For indoor and outdoor use in locations classified as
Class II, Groups E, F, or G as defined in the NEC. |
|
| 10 |
MSHA. Meets the requirements of the Mine Safety and Health
Administration, 30 CFR Part 18 (1978). |
|
| 11 |
General-purpose. Protects against the corrosive effects of liquids
and gases. Meets drip and corrosion-resistance tests. |
|
| 12 and 12K |
General-purpose. Intended for indoor use, provides some protection
against dust, falling dirt, and dripping noncorrosive liquids. Meets drip,
dust, and rust resistance tests. |
IP52 |
| 13 |
General-purpose. Primarily used to provide protection against
dust, spraying of water, oil, and noncorrosive coolants. Meets oil exclusion
and rust resistance design tests. |
IP54 |
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