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NEMA
Enclosures
The
following describes the features of NEMA control enclosure
designations:
NEMA
Type 1
(General Purpose)- To prevent accidental contact with enclosed
apparatus. Suitable for application indoors where not exposed to
unusual service conditions.
NEMA
Type 2 (Driptight)
- To prevent accidental contact, and, in addition, to exclude
falling moisture or dirt.
NEMA
Type 3
(Weatherproof, Weather Resistant) - Protection against specified
weather hazards. Suitable for use outdoors.
NEMA
Type 3R (Raintight)
- Protects against entrance of water from a beating rain. Suitable
for general out door application not requiring sleetproof.
NEMA
Type 4
(Watertight) - Designed to exclude water applied in form of hose
stream. To protect against stream of water during cleaning
operations, etc.
NEMA
Type 5
(Dust Tight) - Constructed so that dust will not enter enclosed
case. Being replaced in some equipment by NEMA 12 Types.
NEMA
Type 6
(Submersible) - Intended to permit enclosed apparatus to be
operated successfully when submerged in water under specified
pressure and time.
NEMA
Type 7
(Hazardous Locations, Class 1, Air Break) - Designed to meet
application requirements of National Electrical Code for Class
I, Hazardous Locations (explosive atmospheres). Circuit
interruption occurs in Class I - Air Break air.
NEMA
Type 8 (Hazardous
Locations A, B, C, or D, Class II - Oil Immersed) - Identical to
Type 7 above, except the apparatus is immersed in oil.
NEMA
Type 9
(Hazardous Locations E, F, or G, Class II) - Designed to meet
application requirements of National Electrical Code for Class II
Hazardous Locations (combustible dusts, etc.)
NEMA
Type 10
(Bureau of Mines Permissible) - Meets requirements of U.S. Bureau
of Mines. Suitable for use in coal mines.
NEMA
Type 11
(Acid and Fume Resistant, Oil Immersed) - Provides oil immersion
of apparatus so that it is suitable for application where
equipment is subject to acid or other corrosive fumes.
NEMA
Type 12
(Industrial Use) - For use in those industries where it is desired
to exclude dust, lint, fibers and flyings, or oil or coolant
seepage.
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