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NEMA Environmental Ratings
for Enclosed Disconnect Switches
Introduction
An enclosure is a surrounding case constructed to provide a degree of
protection to personnel against accidental contact with the enclosed equipment
and to provide a degree of protection to the enclosed equipment against
speci?ed environmental conditions.
A brief description of the more common types of enclosures used by the
electrical industry relating to their environmental capabilities follows. Refer to
De?nitions pertaining to nonhazardous locations
NEMA Standards Publication for more information regarding applications,
features and design tests.
Individual NEMA product Standards Publications or third party certi?cation
standards may contain additional requirements for product testing and
performance.
Type 1
Enclosures are intended for indoor use primarily
to provide a degree of protection against limited
amounts of falling dirt. (NEMA Standard 7-15-1991.)
Type 3R
Enclosures are intended for outdoor use primarily
to provide a degree of protection against rain, sleet
and damage from external ice formation. (NEMA
Standard 7-15-1991.)
Type 4
Enclosures are intended for indoor or outdoor
use primarily to provide a degree of protection
against windblown dust and rain, splashing water,
hose-directed water and damage from external ice
Type 4X
Enclosures are intended for indoor or outdoor use
primarily to provide a degree of protection against
corrosion, windblown dust and rain, splashing water,
hose-directed water and damage from external ice
formation. (NEMA Standard 1-10-1979)
Type 12
Enclosures are intended for indoor use primarily to
provide a degree of protection against circulating
dust, falling dirt, and dripping noncorrosive liquids.
(NEMA Standard 7-15-1991.)
Type 13
Enclosures are intended for indoor use primarily
to provide a degree of protection against dust,
spraying of water, oil and noncorrosive coolant.
(NEMA Standard 1-10-1979.)
formation. (NEMA Standard 1-10-1979.)
85
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