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Enclosure Definitions And Classifications Technical Data

E l e c t r i c a l E n c l o s u r e s

ENCLOSURE DEFINITIONS AND CLASSIFICATIONS

Industry Definitions

The National Electrical Manufacturers Association (NEMA) is a US Manufacturers Organization which actively promotes

standardized product specifications for electrical apparatus.

While NEMA does not actually test products, it establishes the performance criteria for enclosures intended for specific

environments.

NEMA standards describe each type of enclosure in general and functional terms, and specifically omits reference to

construction details. In other words NEMA specifies what an enclosure must do, not how to manufacture it. This is also

true about the EN 60.529/IEC 529.

NEMA performance criteria and test methods are used by Underwriters Laboratories (UL) and Canadian Standards

Association (CSA) as guidelines for investigation and listing of electrical enclosures.

The tested enclosures are then authorized to carry a label by UL or CSA to prove it has passed the required tests and

meets the applicable UL and CSA standard.

NEMA CLASSIFICATIONS

DEFINITIONS – NON-HAZARDOUS LOCATIONS

Type 3

Enclosures are intended for outdoor use primarily to provide a degree of protection against windblown dust, rain, sleet,

and external ice formation. NEMA Standard 1-10-1979.

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. NEMA Standard 1-10-1979.

ENCLOSURES TYPES NON-HAZARDOUS LOCATIONS

Type

Designation

National Electrical Manufacturers Association (Nema Standard 250)

and Electrical and Electronic Mfg. Association of Canada (EEMAC)

Underwriters Laboratories Inc.

(Ul 50 And Ul 508)

Canadian Standards Association

(Standard C22.2 No. 94)

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 protec-

tion 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; undam-

aged by the external formation of ice on the

enclosure.

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.

This material is reproduced fromNEMA. 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 fromUnderwriters

Laboratories Inc. Standard for Safety for

and Industrial Control Equipment, UL 508,

Inc.

Underwriters Laboratories Inc. (UL) shall not

beresponsible to anyone 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 connection with the use,

interpretation of, or reliance upon a UL

Standard.

This material is reproduced from the Canadian

Standards Association.