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Protection Classifications

Standards Comparison:

NEMA, UL, CSA Standard Enclosures

National Electrical

Manufacturers’ Association

(NEMA Standard 250)

Enclosures are intended for use indoors,

primarily to prevent accidental contact of

personnel with the enclosed equipment in

areas where unusual service conditions do

not exist.

Indoor use primarily to provide a degree of

protection against contact with the enclosed

equipment and against a limited amount of

falling water and dirt.

Enclosures are intended for outdoor use

primarily to provide a degree of protection

against windblown dust, rain, sleet, and

external ice formation.

Enclosures are intended for outdoor use

primarily to provide a degree or protection

against windblown falling rain, sleet, and

external ice formation. (May be ventilated).

Enclosures are intended for use indoors or

out doors, to protect the enclosed equipment

against splashing water, seepage of water,

falling or hose directed water, and severe

external condensation. They are sleet

resistant but not sleet (ice) proof.

Type 4X enclosures have the same provisions

as Type 4 enclosures and, in addition, are

corrosion-resistant.

Enclosures are intended for use indoors to

protect the enclosed equipment against fibers,

flyings, lint, dust, and dirt, and light splashing,

seepage, dripping and external condensation

of non-corrosive liquids.

Enclosures are intended for use indoors

primarily to house pilot devices such as limit

switches, foot switches, pilot lights, etc., and

to protect these devices against lint and dust,

seepage, external condensation, and spraying

of water, oil, and coolant.

Indoor use primarily to provide a degree of

protection against contact with the enclosed

equipment and against a limited amount of

falling dirt.

An enclosure for indoor use, constructed so

as to provide a degree of protection against

dripping and light splashing of non-corrosive

liquids, and falling dirt.

Outdoor use 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, rain, and sleet;

undamaged by the formation of ice on the

enclosure.

Indoor or outdoor use to provide a degree of

protection against splashing water, windblown

dust and rain, and hose-directed water;

undamaged by the formation of ice on the

enclosure.

Indoor or outdoor use to provide a degree of

protection against splashing water, windblown

dust and rain, and hose-directed water;

undamaged bythe formation of ice on the

enclosure; resists corrosion.

Indoor use to provide a degree of protection

against dust, falling dirt, and dripping

non-corrosive liquids.

Indoor use to provide a degree of protection

against dust and spraying of water, oil, and

non-corrosive coolants.

General purpose enclosure. Protects against

accidental contact with live parts.

Indoor use to provide a degree of protection

against limited amounts of falling water

and dirt.

An enclosure for either indoor or outdoor use,

constructed so as to provide a degree or

protection against rain, snow, and windblown

dust; undamaged by the external formation

of ice on the enclosure.

An enclosure for either indoor or outdoor use,

constructed so as to provide a degree of

protection against rain, snow, windblown dust,

splashing and hose-directed water; undamaged

by the external formation of ice on the enclosure.

An enclosure for either indoor or outdoor use,

constructed so as to provide a degree of

protection against rain, snow, windblown dust,

splashing and hose-directed water;

undamaged by the external formation of ice

on the enclosure.

An enclosure for either indoor or outdoor use,

constructed so as to provide 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.

An enclosure for indoor use, constructed so

as to provide a degree of protection against

circulating dust, lint, fibers, and flyings;

drippings and light splashing of non-corrosive

liquids; not provided with knockouts.

An enclosure for indoor use, constructed so

as to provide a degree of protection against

circulating dust, lint, fibers, and flyings;

seepage and spraying of non-corrosive

liquids including oils and coolants.

Underwriters’

Laboratories Inc.

(UL 50 and UL 508)

Canadian Standards

Association

(Standard C22.2, Nos. 14, 40 and 94)

Please Note: The information presented here is for reference only and is not meant to be a definitive description of the test requirements and/or qualifications.

The complete standards should be obtained from the appropriate association or agency.

Type

Designation

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