- NEMA 1
- General purpose. For indoor protection where conditions are not unusually severe.
- NEMA 2
- Drip-tight. For indoor use. Designed to exclude falling
moisture or dirt. Particularly applicable to cooling rooms,
laundries, etc., where condensation is prevalent.
- NEMA 3
- Weatherproof. For outdoor use. Designed to withstand all
normal exposure to natural elements. Controls mounted on
pullout racks for easy access. With rain hood and weather
seals.
- NEMA 4
- Watertight and dust-tight. Intended for use indoors or
outdoors to protect equipment against splashing, falling, or
hose-directed water, external condensation, and water
seepage. Withstands water pressure from 1" hose nozzle, 65
gallons per minute, from distances of not less than 10 feet
for a period of five minutes.
- NEMA 4X
- Watertight, dust-tight, and corrosion-resistant
enclosures. Meets the same qualifications as NEMA 4 but with
added corrosion resistance.
- NEMA 5
- Dust-tight. Equipped with dust-tight gaskets. Suitable
for mills and other high-dust atmospheres.
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- NEMA 6
- Submersible. For submerged operation under specified
pressures and time.
- NEMA 7
- Enclosures for indoor Class I, Division 1 hazardous
locations with gas or vapor atmospheres. National Electrical
Code class 1 (circuit breaks in air).
- NEMA 8
- Hazardous locations. National Electrical Code class 1
(circuit breaks immersed in oil).
- NEMA 9
- For indoor Class II, Division I hazardous locations with
combustible dust atmospheres. National Electrical Code class
2.
- NEMA 10
- Explosion-proof. Meets U.S. Bureau of Mines requirements
for explosive atmospheres. Units that are designed to
contain gas or vapor explosions within the enclosure and
prevent ignition of the surrounding atmospheres.
- NEMA 11
- Acid- or fume-resistant. Provides for immersion of
enclosed equipment in oil.
- NEMA 12
- Industrial use. Excludes oils, dust, moisture, to
satisfy individual requirements.
- NEMA 13
- Oil-tight and dust-tight. Intended for indoor use.
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