NEMA Enclosure Types

NEMA Enclosure Types
Type 3S 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 for
which the external mechanism(s) remain operable when ice laden.
Type 3X 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); that
provides an additional level of protection against corrosion and that will be undamaged
by the external formation of ice on the enclosure.
Type 3RX 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); 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.
Type 3SX 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); that
provides an additional level of protection against corrosion; and for which the external
mechanism(s) remain operable when ice laden.
Type 4 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.
National Electrical Manufacturers Association Approved by NEMA Enclosures Section
1300 N. 17
th
Street, Suite 1752 November 2005
Rosslyn, VA 22209