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NEMA
Standards
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NEMA
Type
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NEMA
Definition*
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Application
for NEMA Enclosures*
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1
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Enclosures
are intended for indoor use primarily to provide a degree of protection
against contact with the enclosed equipment in areas where unusual
service conditions do not exist. |
Enclosures
are suitable for general application indoors, where atmospheric conditions
are normal. These enclosures
provide limited protection against falling dust, but are not dust
tight. |
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2
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Enclosures
are intended for indoor use primarily to provide a degree of protection
against limited amounts of falling dust and water. NEMA Standard 1-10-1979 |
Drip
tight (indoor) enclosures are similar to Type 1 enclosures, with the
addition of drip shields, and are suitable for application where condensation
may be severe, such as that encountered in cooling rooms or laundries. |
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3
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Enclosures
are intended for outdoor use primarily to provide a degree of protection
against windblown dust, rain, sleet and external ice formation. NEMA Standard 1-10-1979 |
Suitable
for applications outdoors on ship docks, canal locks, construction
work and for application in tunnels and subways.
Use indoors where dripping water is a problem. |
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3R
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Enclosures
are intended for outdoor use primarily to provide limited protection
against falling rain, sleet and external ice formation. (May be ventilated). NEMA
Standard 1-10-1979 |
Outdoor
use to provide a degree of protection against falling rain and sleet;
undamaged by the formation of ice on the enclosure. |
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4
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Enclosures
are intended for indoor or outdoor use primarily to provide a degree
of protection against windblown dust and rain, splashing water, and
hose-directed water. NEMA
Standard 1-10-1979 |
Water
tight enclosures are suitable for dairies, breweries, etc., where
they are subjected to large amounts of water from any angle. (They are not submersible) |
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4X
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Enclosures
are for indoor or outdoor use primarily to provide a degree of protection
against corrosion, windblown dust and rain, splashing water and hose
directed water. NEMA Standard
1-10-1979 |
Corrosion
resistant enclosures satisfy the requirements of Type 4, and are suitable
for food processing plants, dairies, refineries and any other industries
where corrosion is prominent. |
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5
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Enclosures
are intended for indoor use primarily to provide a degree of protection
against settling airborne dust, falling dirt and dripping non-corrosive
liquids. NEMA Standard 5-25-1988. |
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6
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Enclosures
are for indoor or outdoor use primarily to provide a degree of protection
against the entry of water, during occasional, temporary submersion
at a limited depth. NEMA Standard
1-10-1979 |
Submersible
enclosures are suitable for application where the equipment may be
subject to submersion, such as quarries, mines and manholes. The enclosure design will depend upon the specified conditions
of pressure and time. |
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7
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Enclosures
are for indoor use in locations that are classified as Class I, Groups
A, B, C or D, as defined in the National Electric Code. NEMA Standard 1-10-1979. |
Hazardous
areas indoor classified as shown. |
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8
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Enclosures
are for indoor or outdoor use in locations that are classified as
Class I, Groups A, B, C, or D, as defined in the National Electric
Code. NEMA Standard 1-10-1979 |
Hazardous
areas indoor or outdoor classified as shown. |
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9
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Enclosures
are for indoor use in locations classified as Class II, Groups E,
F, or G, as defined in the National Electrical Code.
NEMA Standard 5-19-1986 |
Hazardous
areas indoor enclosures classified as Class II, Group E, F, or G. |
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12
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Enclosures
are intended for indoor use primarily to provide a degree of protection
against dust, falling dirt and dripping non-corrosive liquids. NEMA Standard 1-10-1979. |
Indoor
uses to protect the equipment against fibers flyings, lint, dust,
and light splashing, seepage, dripping, and external condensation
of non-corrosive liquids. |
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13
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Enclosures
are intended for indoor use primarily to provide a degree of protection
against dust, spraying water, oil, and non-corrosive coolant. NEMA Standard 1-10-1979 |
Indoor
enclosures intended primarily to house pilot devices such as limit
switches, push buttons, selector switches, pilot lights, etc., and
to protect these devices against lint and dust, seepage, external
condensation, and spraying of water, oil, and co |
