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NEMA Enclosure Ratings
NEMA
enclosure
type no. |
NEMA definition |
| 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. |
| 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). |
| 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. |
| 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. |
| 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. |
| 5 |
Dust-tight. Provided with gaskets or
equivalent to exclude dust; used in steel mills and cement plants. |
| 6 and 6P |
Submersible. Design depends on
specified conditions of pressure and time; submersible in water;
used in quarries, mines, and manholes. |
| 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. |
| 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. |
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