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Nema Standards __________________
NEMA 1
Enclosures constructed for indoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment and to provide a degree of protection against falling
dirt.
NEMA 2
Same as NEMA 1 including protection against dripping and light splashing of liquids.
NEMA 3
Enclosures constructed for either indoor or outdoor use to provide a degree of protection to personnel against incidental contact with the
enclosed equipment; to provide a degree of protection against falling dirt, rain, sleet, snow, and windblown dust; and that will be undamaged by the
external formation of ice on the enclosure.
NEMA 3R
Same as NEMA 3 excluding protection against windblown dust.
NEMA 3S
Enclosures constructed for either indoor or outdoor use to provide a degree of protection to personnel against incidental contact with
the enclosed equipment; to provide a degree of protection against falling dirt, rain, sleet, snow, and windblown dust; and in which the external mechanism(s) remain
operable when ice laden.
NEMA 4
Enclosures constructed for either indoor or outdoor use to provide a degree of protection to personnel against incidental contact with the enclosed
equipment; to provide a degree of protection against falling dirt, rain, sleet, snow, and windblown dust; and that will be undamaged by the external formation of ice on the enclosure.
NEMA 4X
Same as NEMA 4 including protection against corrosion.
NEMA 5
Enclosures constructed for indoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment;
to provide a degree of protection against falling dirt; against settling airborne dust, lint, fibers, and flyings; and to provide a degree of protection
against dripping and light splashing of liquids.
NEMA 6
Same as NEMA 4 including protection against corrosion.
NEMA 6P
Same as NEMA 6 including protection against the entry of water during prolonged submersion at a limited depth.
NEMA 7
Enclosures are for indoor use in locations classified as Class I, Groups A, B, C, or D and shall be capable of withstanding the pressures
resulting from an internal explosion of specified gases, and contain such an explosion sufficiently that an explosive gas-air mixture existing in
the atmosphere surrounding the enclosure will not be ignited. Enclosed heat generating devices shall not cause external surfaces to reach
temperatures capable of igniting explosive gas-air mixtures in the surrounding atmosphere. Enclosures shall meet explosion, hydro-static,and temperature design tests.
NEMA 9
Enclosures are intended for indoor use in locations classified as Class II, Groups E, F, or G, and shall be capable of preventing the entrance
of dust. Enclosed heat generating devices shall not cause external
surfaces to reach temperatures capable of igniting or discoloring dust on theenclosure or igniting dust-air
mixtures in the surrounding atmosphere. Enclosures shall meet dust penetration and temperature design tests, and
aging of gaskets (if used).
NEMA 12
Enclosures constructed (without knockouts) for indoor use to provide a degree of protection to personnel against incidental contact
with the enclosed equipment; to provide a degree of protection against falling dirt; against circulating dust, lint, fibers, and flyings; and
against dripping and light splashing of liquids.
NEMA 12K
Same as NEMA 12 including enclosures constructed with knockouts.
NEMA 13
Enclosures constructed for indoor use to provide a degree of protection to personnel against incidental contact with the enclosed
equipment; to provide a degree of protection against falling dirt; against circulating dust, lint, fibers, and flyings; and against the spraying,
splashing, and seepage of water, oil, and non-corrosive coolants.