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Enclosure Ratings (NEMA Standards)
Definitions Pertaining to Non-Hazardous Locations
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Type 1 Enclosures
are constructed for indoor use to provide a degree of protection to
personnel against access to hazardous parts and to provide a degree
of protection of the equipment inside the enclosure against ingress
of solid foreign objects (falling dirt).
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Type 2 Enclosures
are constructed for indoor use to provide a degree of protection to
personnel against access to hazardous parts, to provide a degree of
protection of the equipment inside the enclosure against ingress of
solid foreign objects (falling dirty, and to provide a degree of
protection with respect to harmful effects on the equipment due to
the ingress of water (dripping and light splashing).
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Type 3 Enclosures
are constructed for either indoor or outdoor use to provide a degree
of protection to personnel against access to hazardous parts, to
provide a degree of protection of the equipment inside the enclosure
against ingress of solid foreign objects (falling dirt) and
windblown dusty, to provide a degree of protection with respect to
harmful effects on the equipment due to the ingress of water (rain,
sleet, snow), and that will be undamaged by the external formation
of ice on the enclosure.
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Type 3R Enclosures
are constructed for either indoor or outdoor use to provide a degree
of protection to personnel against access to hazardous parts, to
provide a degree of protection of the equipment inside the enclosure
against ingress of solid foreign objects (falling dirt) to provide a
degree of protection with respect to harmful effects on the
equipment due to the ingress of water (rain, sleet, snow), and that
will be undamaged by the external formation of ice on the enclosure.
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Type 3S Enclosures
are constructed for either indoor or outdoor use to provide a degree
of protection to personnel against access to hazardous parts, to
provide a degree of protection of the equipment inside the enclosure
against ingress of solid foreign objects (falling dirt and windblown
dust) to provide a degree of protection with respect to harmful
effects on the equipment due to the ingress of water (rain, sleet,
snow), red for which the external mechanisms) remain operable when
ice laden.
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Type 3X Enclosures
are constructed for either indoor or outdoor use to provide a degree
of protection to personnel against access to hazardous parts, to
provide a degree of protection of the equipment inside the enclosure
against ingress of solid foreign objects (falling dirt) and
windblown dusty, to provide a degree of protection with respect to
harmful effects on the equipment due to the ingress of water (rain,
sleet, snow), that provides an additional level of protection
against corrosion and that will be undamaged by the external
formation of ice on the enclosure.
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Type 3XR Enclosures
are constructed for either indoor or outdoor use to provide a degree
of protection to personnel against access to hazardous parts, to
provide a degree of protection of the equipment inside the enclosure
against ingress of solid foreign objects (falling dirt), to provide
a degree of protection with respect to harmful effects on the
equipment due to the ingress of water (rain, sleet, snow), that will
be undamaged by the external formation of ice on the enclosure that
provides an additional level of protection against corrosion, and
that will be undamaged by the external formation of ice on the
enclosure.
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Type 3SX Enclosures
are constructed for either indoor or outdoor use to provide a degree
of protection to personnel against access to hazardous parts, to
provide a degree of protection of the equipment inside the enclosure
against ingress of solid foreign objects (falling dirt and windblown
dusty, to provide a degree of protection with respect to harmful
effects on the equipment due to the ingress of water (rain, sleet,
snowy, that provides an additional level of protection against
corrosion, and for which the external mechanisms) remain operable
when ice laden.
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Type 4 Enclosures
are constructed for either indoor or outdoor use to provide a degree
of protection to personnel against access to hazardous parts, to
provide a degree of protection of the equipment inside the enclosure
against ingress of solid foreign objects (falling dirt and windblown
dusty, to provide a degree of protection with respect to harmful
effects on the equipment due to the ingress of water (rain, sleet,
snow, splashing water, and hose directed water), and that will be
undamaged by the external formation of ice on the enclosure.
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Type 4X Enclosures
are constructed for either indoor or outdoor use to provide a degree
of protection to personnel against access to hazardous parts, to
provide a degree of protection of the equipment inside the enclosure
against ingress of solid foreign objects (windblown dusty, to
provide a degree of protection with respect to harmful effects on
the equipment due to the ingress of water (rain, sleet, snow,
splashing water, and hose directed water), that provides an
additional level of protection against corrosion, and that will be
undamaged by the external formation of ice on the enclosure.
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Type 5 Enclosures
are constructed for indoor use to provide a degree of protection to
personnel against access to hazardous parts, to provide a degree of
protection of the equipment inside the enclosure against ingress of
solid foreign objects (falling dirt and settling airborne dust,
lint, fibers, and flyings), and to provide a degree of protection
with respect to harmful effects on the equipment due to the ingress
of water (dripping and light splashing).
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Type 6 Enclosures
are constructed for either indoor or outdoor use to provide a degree
of protection to personnel against access to hazardous parts, to
provide a degree of protection of the equipment inside the enclosure
against ingress of solid foreign objects (falling dirt), to provide
a degree of protection with respect to harmful effects on the
equipment due to the ingress of water (hose directed water and the
entry of water during occasional temporary submersion at a limited
depths), and that will be undamaged by the external formation of ice
on the enclosure.
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Type 6P Enclosures
are constructed for either indoor or outdoor use to provide a degree
of protection to personnel against access to hazardous parts, to
provide a degree of protection of the equipment inside the enclosure
against ingress of solid foreign objects (falling dirt), to provide
a degree of protection with respect to harmful effects on the
equipment due to the ingress of water (hose directed water and the
entry of water during prolonged submersion at a limited depths),
that provides an additional level of protection against corrosion
and that will be undamaged by the external formation of ice on the
enclosure.
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Type 12 Enclosures
are constructed (without knockouts) for indoor use to provide a
degree of protection to personnel against access to hazardous parts,
to provide a degree of protection of the equipment inside the
enclosure against ingress of solid foreign objects (falling dirt and
circulating dust, lint, fibers, and flyings), and to provide a
degree of protection with respect to harmful effects on the
equipment due to the ingress of water (dripping and light
splashing).
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Type 12K Enclosures
are constructed (with knockouts) for indoor use to provide a degree
of protection to personnel against access to hazardous parts, to
provide a degree of protection of the equipment inside the enclosure
against ingress of solid foreign objects (failing dirt and
circulating dust, lint, fibers, and flyings), and to provide a
degree of protection with respect to harmful effects on the
equipment due to the ingress of water (dripping and light
splashing).
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Type 13 Enclosures
are constructed for indoor use to provide a degree of protection to
personnel against access to hazardous parts, to provide a degree of
protection of the equipment inside the enclosure against ingress of
solid foreign objects (falling dirt and circulating dust, lint,
fibers, and flyings), to provide a degree of protection with respect
to harmful effects on the equipment due to the ingress of water
(dripping and light splashing), and to provide a degree of
protection against the spraying, splashing, and seepage of oil and
non-corrosive coolants.
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