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NEMA enclosure typesFrom Wikipedia, the free encyclopedia

The National Electrical Manufacturers Association (NEMA) defines standards for various grades ofelectrical enclosures typically used in industrial applications. Each is rated to protect against personalaccess to hazardous parts, and additional type­dependent designated environmental conditions. A typicalNEMA enclosure might be rated to provide protection against environmental hazards such as water,dust, oil or coolant or atmospheres containing corrosive agents such as acetylene or gasoline. A full listof NEMA enclosure types is available from the NEMA website.[1]

Contents

1 Enclosure types

2 See also

3 References

4 External links

Enclosure types

Below is a list of NEMA enclosure types; these types are further defined in NEMA ICS 6: Enclosuresstandard. Each type specifies characteristics of an enclosure, but not, for example, a specific enclosuresize. Note that higher numbers do not include the lower­numbered tests. For example, types 3, 4 and 6are intended for outdoor use, but type 5 is not.

NFPA is National Fire Protection Association, and NEC is National Electrical Code (U.S.A.)

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NEMAType Definition[1][2]

1General­purpose. Protects against dust, light, and indirect splashing but is not dust­tight;primarily prevents contact with live parts; used indoors and under normal atmosphericconditions.

2 Drip­tight. Similar to Type 1 but with addition of drip shields; used where condensation maybe severe (as in cooling and laundry rooms).

3Weather­resistant. Protects against falling dirt and windblown dust, against weather hazardssuch as rain, sleet and snow, and is undamaged by the formation of ice. Used outdoors on shipdocks, in construction work, and in tunnels and subways.

3R As 3, but omits protection against windblown dust.3S As 3, but also operable when laden with ice.3X,3RX,3SX

X indicates additional corrosion protection; commonly used near salt water.

4 and4X

Watertight. Must exclude at least 65 GPM of water from 1­in. nozzle delivered from a distancenot less than 10 ft for 5 min. Used outdoors on ship docks, in dairies, and in breweries. X (as4X) indicates additional corrosion resistance.

5 Dust­tight. Provided with gaskets or equivalent to exclude dust; used in steel mills and cementplants.

6 and6P

Submersible. Design depends on specified conditions of pressure and time; submersible inwater or oil; used in quarries, mines, and manholes. 6 is temporarily submersible, 6Pwithstands occasional prolonged submersion. Neither are intended for continuous submersion.

7 Certified and labeled for use in areas with specific hazardous conditions: for indoor use inClass I, Groups A, B, C, and D environments as defined in NFPA standards such as the NEC.

8Certified and labeled for use in areas with specific hazardous conditions: for indoor andoutdoor use in locations classified as Class I, Groups A, B, C, and D as defined in NFPAstandards such as the NEC.

9Certified and labeled for use in areas with specific hazardous conditions: for indoor andoutdoor use in locations classified as Class II, Groups E, F, or G as defined in NFPA standardssuch as the NEC.

10 MSHA. Meets the requirements of the Mine Safety and Health Administration, 30 CFR Part18 (1978).

11 General­purpose. Protects against the corrosive effects of liquids and gases. Meets drip andcorrosion­resistance tests.

12 and12K

General­purpose. Intended for indoor use, provides some protection against dust, falling dirt,and dripping noncorrosive liquids. Meets drip, dust, and rust resistance tests.

13 General­purpose. Primarily used to provide protection against dust, spraying of water andnoncorrosive coolants. Meets oil exclusion and rust resistance design tests.

NEMA enclosure ratings are similar to IEC IP Codes and can offer the same protections,[3] but cannotdirectly be mapped. See IP Codes & NEMA.

See also

NEMA connector

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Efficient energy useCOCIRInternational Electrotechnical CommissionIP Code

References1. NEMA Enclosure Types (from NEMA 250­2003) (http://www.nema.org/Products/Documents/nema­

enclosure­types.pdf)2. "NEMA/IEC enclosure ratings" (http://www.coleparmer.com/techinfo/techinfo.asp?

htmlfile=NEMA_IEC.htm&ID=511), Cole­Parmer Technical Library3. http://www.bisonprofab.com/ip­ratings­explained.htm | Bison Profab's IP Ratings Calculator Comparison

External links

NEMA Ratings Chart (http://www.2mcctv.com/blog/2012_01_05­nema­ratings­ip­comparison/)NEMA 4 Enclosures (http://www.bisonprofab.com/nema­4­enclosure.htm)

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Categories: NEMA standards Electrical enclosures

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