NEMA, UL and CSA Standards

03/01/1999


Enclosure Rating

NEMA
National Electrical Manufacturers Association (NEMA 250)

UL
Underwriters Laboratories, Inc. (UL 50 and 508)

CSA
Canadian Standards Association
(C22.2 No. 94-M91)

Type 1

Enclosures are intended for indoor use primarily to provide a degree of protection against the contact with the enclosed equipment.

Indoor use primarily to provide protection against contact with the enclosed equipment and against a limited abount of falling dirt.

General purpose enclosure. Protects against accidental contact with live parts.

Type 2

Enclosures are intended for indoor use primarily to provide a degree of protection against limited amounts of falling water and dirt.

Indoor use to provide a degree of protection against contact with the enclosed equipment and against a limited amount of falling dirt.

Indoor use to provide a degree of protection against dripping and light splashing of noncorrosive liquids, and falling dirt.

Type 3

Enclosures are intended for outdoor use primarily to provide a degree of protection against rain, sleet, windblown dust, and damage from external ice formation.

Outdoor use to provide a degree of

Indoor or outdoor use to provide a degree of protection against rain, snow, and windblown dust; undamaged by the external formation of ice on the enclosure.

Type 3R

Enclosures are intended for outdoor use primarily to provide a degree of protection against rain, sleet, and damage from external ice formation.

Outdoor use to provide a degree of

Indoor or outdoor use to provide a degree of protection against rain, snow; undamaged by the external formation of ice on the enclosure.

Type 4

Enclosures are intended for indoor and outdoor use primarily to provide a degree of protection against windblown dust and rain, splashing water, hose-directed water, and damage from external ice formation.

Indoor or outdoor use to provide a degree of

Indoor or outdoor use to provide a degree of protection against rain, snow, and windblown dust; splashing and hose-directed water; undamaged by the external formation of ice on the enclosure.

Type 4X

Enclosures are intended for indoor and outdoor use primarily to provide a degree of protection against corrosion, windblown dust and rain, splashing water, hose-directed water, and damage from external ice formation.

Indoor or outdoor use to provide a degree of

Indoor or outdoor use to provide a degree of protection against rain, snow, and windblown dust; splashing and hose-directed water; undamaged by the external formation of ice on the enclosure; resists corrosion.

Type 6

Enclosures are intended for indoor and outdoor use primarily to provide a degree of protection againsthose-directed water, the entry of water during occasional temporary submersion at a limited depth, and damage from external ice formation.

Indoor or outdoor use to provide a degree of

Indoor or outdoor use to provide a degree of protection against entry of water during temporary submersion at a limited depth; undamaged by the formation of ice on the enclosure.

Type 12

Enclosures are intended for indoor use primarily to provide a degree of protection against circulating dust, falling dirt, and dripping non-corrosive liquids.

Indoor use to provide a degree of

Indoor use primarily to provide a degree of protection against circulating dust, lint, fibers, and flyings; dripping and light splashing of noncorrosive liquids; not provided with knockouts.

Type 13

Enclosures are intended for indoor use primarily to provide a degree of protection against dust, spraying water, oil and non-corrosive liquids.

Indoor use to provide a degree of

Indoor use primarily to provide a degree of protection against circulating dust, lint, fibers, and flyings; seepage and spraying of noncorrosive liquids including oils and coolants.





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