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Electrical Electronic Enclosure NEMA Standard 250

Instrumentation, Electrical, and ControlRack Mounted Enclosure Manufacturers | NEMA Listed Enclosures

This material is derived from National Electrical Manufacturers Association for Electrical Equipment,NEMA 250, “Enclosures for Electrical Equipment (1000 Volts Maximum),” copyright 1997 by NEMA..

The information contained herein is not intended to be complete descriptions. Refer to NEMA Standard250 for complete details.

TYPE Application & Description

Type 1Applies to enclosures that are intended for indoor use primarily to provide someprotection against contact with the enclosed equipment or locations where nontypicalservice conditions do not exist.

Type 3For Enclosures that used for outdoor use primarily to provide some protection againstwindblown dust, rain, and sleet; resistant and undamaged by the formation of ice on theenclosure.

Type 3RFor enclosures that are used in the outdoors primarily to provide a protection againstfalling rain and sleet; undamaged by the formation of ice on the enclosure.

Type 4For enclosures that are used in indoor or outdoor use to provide a protection againstwindblown dust and rain, splashing water, and hose directed water; undamaged by theformation of ice on the enclosure.

Type 4XFor enclosures that are used for indoor or outdoor use to provide a protection againstcorrosion, windblown dust and rain, splashing water, and hose-directed water;undamaged by the formation of ice on the enclosure.

Type 6

Submersible enclosures are suitable for application where the equipment may be subjectto submersion. The enclosure design will depend upon the specified conditions ofpressure and time. The enclosure will also remain undamaged by the formation of ice on

the enclosure.

Type 9

Hazardous location enclosures - Class II, Group E, F or G. These enclosures aredesigned to meet the requirements of the "Canadian Electrical Code" Part I for Class IIhazardous locations, and CSA codes section 18 Class II Group E,f, and G.

Class II Group E - atmosphere containing metal dustClass II Group F - atmosphere containing carbon black, coal, or coke dust.Class II Group G - atmosphere containing flour, starch or grain dust.

Type 12For enclosures that will operate primarily indoors. Industrial application are typicalwhere the enclosures are oil tight.

Type 12KThese enclosures that will operate primarily indoors and have knockouts. Industrial

application are typical where the enclosures are oil tight.

Type 13

The cover is held in place with screws, bolts or other suitable fasteners, with a

continuous gasket construction. The fastener parts are held captive when the door isopened. There are no holes through the enclosures for mounting or attaching controlsinside the enclosure, and no conduit knock-outs or openings. Mounting feet, brackets,or other mounting means are provided. These enclosures are suitable for application tomachine tools and other industrial processing machines where oil, coolants, water,filings, dust or lint may enter, seep into or infiltrate the enclosure through mounting holes,unused conduit knock-outs, or holes used for mounting equipment with the enclosure.

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These are not intended to be complete descriptions. Refer to NEMA Standard 250 for complete details.

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