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NEMA, UL and CSA Ratings

Enclosure Type Descriptions for Non-Hazardous Locations:

  
 Type NEMA UL CSA 
 
Indoor Type 1 Enclosures are intended for indoor use primarily
to provide a degree of protection against contact
with the enclosed equipment or locations where
unusual service conditions do not exist.		 Indoor use primarily to provide protection against
contact with the enclosed equipment and against
a limited amount of falling dirt.		 General purpose enclosure. Protects against
accidental contact with live parts.
Indoor Type 12 Enclosures are intended for indoor use primarily to
provide a degree of protection against dust, falling
dirt and dripping noncorrosive liquids.		 Indoor use to provide a degree of protection against
dust, dirt, fiber flyings, dripping water and external
condensation of noncorrosive liquids.		 Indoor use; provides a degree of protection against circulating
dust, lint, fibers and flyings; dripping and light splashing of
non-corrosive liquids; not provided with knockouts.
Indoor Type 12K Enclosures with knockouts are intended for indoor
use primarily to provide a degree of protection against
dust, falling dirt and dripping noncorrosive liquids.		 Indoor use to provide a degree of protection against
dust, dirt, fiber flyings, dripping water and external
condensation of noncorrosive liquids.		 Indoor use; provides a degree of protection against circulating
dust, lint, fibers and flyings; dripping and light splashing
of noncorrosive liquids; not provided with knockouts.
Indoor Type 13 Enclosures are intended for indoor use primarily to
provide a degree of protection against dust, spraying
of water, oil and noncorrosive coolant.		 Indoor use to provide a degree of protection against
lint, dust seepage, external condensation and
spraying of water, oil and noncorrosive liquids.		 Indoor use; provides a degree of protection against circulating
dust, lint, fibers and flyings; seepage and spraying of
non-corrosive liquids, including oils and coolants.
Outdoor Type 3 Enclosures are intended for outdoor use primarily to
provide a degree of protection against windblown dust, rain
and sleet; undamaged by the formation of ice on the enclosure.		 Outdoor use to provide a degree of protection against
windblown dust and windblown rain; undamaged by
the formation of ice on the enclosure.		 Indoor or outdoor use; provides a degree of protection against
rain, snow and windblown dust; undamaged by the external
formation of ice on the enclosure.
Outdoor Type 3R Enclosures are intended for outdoor use primarily to provide a
degree of protection against falling rain and sleet; undamaged
by the formation of ice on the enclosure.		 Outdoor use to provide a degree of protection against
falling rain; undamaged by the formation of ice
on the enclosure.		 Indoor or outdoor use; provides a degree of protection against
rain and snow; undamaged by the external formation
of ice on the enclosure.
Outdoor Type 3RX Enclosures are intended for outdoor use primarily to
provide a degree of protection against corrosion, falling rain
and sleet; undamaged by the formation of ice on the enclosure.		 Not specifically defined. Not specifically defined.
Outdoor Type 4 Enclosures are intended for indoor or outdoor use primarily
to provide a degree of protection against windblown dust
and rain, splashing water and hose directed water;
undamaged by the formation of ice on the enclosure.		 Either indoor or outdoor use to provide a degree
of protection against falling rain, splashing water
and hose-directed water; undamaged by the
formation of ice on the enclosure.		 Indoor or outdoor use; provides a degree of protection against rain, snow, windblown dust, splashing and hose-directed water; undamaged by the external formation of ice on the enclosure.
Outdoor 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 and hose-directed
water; undamaged by the formation of ice on the enclosure.		 Either indoor or outdoor use to provide a degree of
protection against falling rain, splashing water and
hose-directed water; undamaged by the formation
of ice on the enclosure; resists corrosion.		 Indoor or outdoor use; provides a degree of protection against rain,
snow, windblown dust, splashing and hose-directed water;
undamaged by the external formation of ice on the enclosure;
resists corrosion.
Outdoor Type 6 Enclosures are intended for use indoors or outdoors where
occasional submersion is encountered; limited depth;
undamaged by the formation of ice on the enclosure.		 Indoor or outdoor use to provide a degree of protection against entry of water during temporary submersion at a limited depth; undamaged by the external formation of ice on the enclosure. Indoor or outdoor use; provides a degree of protection against
the entry of water during temporary submersion at a limited
depth. Undamaged by the external formation of ice on the
enclosure; resists corrosion.

 

This material is reproduced with permission from NEMA. The preceding descriptions, however, are not intended to be complete
representations of National Electrical Manufacturers Association standards for enclosures nor those of the Electrical and Electronic Manufacturers Association of Canada.

This material is reproduced with permission from Underwriters Laboratories Inc. Enclosures for Electrical Equipment, UL 50, 50E and
Industrial Control Panels, UL 508A.

This material is reproduced with permission from the Canadian Standards Association.

Underwriters Laboratories Inc. (UL) shall not be responsible for the use of or reliance upon a UL Standard by anyone. UL shall not incur
any obligation or liability for damages, including consequential damages, arising out of or in connection with the use, interpretation of,
or reliance upon a UL Standard.

Some enclosures may have multiple ratings. For instance:

 

4, 12—Outdoor use; able to be used indoors with modifications

 

 

4X, 3RX—Outdoor use; able to be used indoors with modifications

 

 

4, 9—Can be used in both hazardous and non-hazardous locations