2025 Nelsen Corporation Catalog - Catalog - Page 449
TYPE 1 – General Purpose - Enclosures 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).
TYPE 6 & 6P – Submersible - Design depends on
specified conditions of pressure and time; submersible in
water or oil; used in quarries, mines, and manholes. 6 is
temporarily submersible, 6P withstands occasional prolonged
submersion. Neither are intended for continuous submersion.
TYPE 2 – Drip Tight - Enclosures 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 to provide a degree of
protection with respect to harmful effects on the equipment
due to the ingress of water (dripping and light splashing).
TYPE 7 - Certified and labelled for use in areas with specific
hazardous conditions: for indoor use in Class I, Groups A,
B, C, and D environments as defined in NFPA standards
such as the NEC.
TYPE 3 – Weather Resistant - Enclosures 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); and that will be
undamaged by the external formation of ice on the enclosure.
TYPE 3R - As 3, but omits protection against windblown dust.
TYPE 3S - As 3, but also operable when laden with ice.
3X, 3RX, 3SX - X indicates additional corrosion protection;
commonly used near salt water.
TYPE 4 – Watertight - Enclosures 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, splashing water, and hose
directed water); and that will be undamaged by the external
formation of ice on the enclosure.
TYPE 8 - Certified and labeled for use in areas with specific
hazardous conditions: for indoor and outdoor use in locations
classified as Class I, Groups A, B, C, and D as defined in NFPA
standards such as the NFPA 70.
TYPE 9 - Certified and labelled for use in areas with specific
hazardous conditions: for indoor and outdoor use in locations
classified as Class II, Groups E, F, or G as defined in NFPA
standards such as the NEC.
Technical & Engineering
Nema Standards for Electrical Enclosures 17
TYPE 10 – MSHA - Meets the requirements of the Mine
Safety and Health Administration, 30 CFR Part 18 (1978).
TYPE 11 – General Purpose - Protects against the corrosive
effects of liquids and gases. Meets drip and corrosionresistance tests.
TYPE 12 & 12K – General Purpose - Intended for indoor
use, provides some protection against dust, falling dirt, and
dripping non-corrosive liquids. Meets drip, dust, and rust
resistance tests.
TYPE 13 – General Purpose - Primarily used to provide
protection against dust, spraying of water and non-corrosive
coolants. Meets oil exclusion and rust resistance design tests.
TYPE 4X – Watertight - Same as Type 4 but provides an
additional level of protection against corrosion
TYPE 5 – Dust Tight - Enclosures 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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All prices and products subject to change without notice. ©Nelsen Corporation
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