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Electrical Enclosure Types by NEMA

Description of NEMA electrical enclosures types.

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For enclosures used in

Non-Hazardous Locations

Type 1 : General Purpose - Indoor

  • Enclosures constructed for indoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment and to provide a degree of protection against falling dirt.

Type 2 : Drip-Proof - Indoor

  • Enclosures constructed for indoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment, to provide a degree of protection against falling dirt, and to provide a degree of protection against dripping and light splashing of liquids.

Type 3 : Dust tight, Rain tight, Sleet tight - Outdoor

  • Enclosures constructed for either indoor or outdoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment - to provide a degree of protection against falling dirt, rain, sleet, snow, and windblown dust - and that will be undamaged by the external formation of ice on the enclosure.

Type 3R : Rain tight, Sleet Resistant - Outdoor

  • Enclosures constructed for either indoor or outdoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment - to provide a degree of protection against falling dirt, rain, sleet, and snow - and that will be undamaged by the external formation of ice on the enclosure.

Type 3S : Dust tight, Rain tight, Sleet tight - Outdoor

  • Enclosures constructed for either indoor or outdoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment - to provide a degree of protection against falling dirt, rain, sleet, snow, and windblown dust - and in which the external mechanism(s) remain operable when ice laden.

Type 4 : Watertight, Dust tight, Sleet Resistant - Indoor &amp - Outdoor

  • Enclosures constructed for either indoor or outdoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment - to provide a degree of protection against falling dirt, rain, sleet, snow, windblown dust, splashing water, and hose-directed water - and that will be undamaged by the external formation of ice on the enclosure.

Type 4X : Watertight, Dust tight, Corrosion-Resistant - Indoor &amp - Outdoor

  • Enclosures constructed for either indoor or outdoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment - to provide a degree of protection against falling dirt, rain, sleet, snow, windblown dust, splashing water, hose-directed water, and corrosion and that will be undamaged by the external formation of ice on the enclosure.

Type 5 : Dust tight, Drip-Proof - Indoor

  • Enclosures constructed for indoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment - to provide a degree of protection against falling dirt - against settling airborne dust, lint, fibers, and flyings - and to provide a degree of protection against dripping and light splashing of liquids.

Type 6 : Occasionally Submersible, Watertight, Sleet Resistant - Indoor &amp - Outdoor

  • Enclosures constructed for either indoor or outdoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment - to provide a degree of protection against falling dirt - against hose-directed water and the entry of water during occasional temporary submersion at a limited depth - and that will be undamaged by the external formation of ice on the enclosure.

Type 6P : Watertight, Sleet Resistant Prolonged Submersion - Indoor &amp - Outdoor

  • Enclosures constructed for either indoor or outdoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment - to provide a degree of protection against falling dirt - against hose-directed water and the entry of water during prolonged submersion at a limited depth - and that will be undamaged by the external formation of ice on the enclosure.

Type 12 : Dust tight and Drip tight - Indoor

  • Enclosures constructed (without knockouts) for indoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment - to provide a degree of protection against falling dirt - against circulating dust, lint, fibers, and flyings - and against dripping and light splashing of liquids.

Type 12K : Dust tight and Drip tight, with Knockouts - Indoor

  • Enclosures constructed (with knockouts) for indoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment - to provide a degree of protection against falling dirt - against circulating dust, lint, fibers, and flyings - and against dripping and light splashing of liquids.

Type 13 : Oil tight and Dust tight - Indoor

  • Enclosures constructed for indoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment - to provide a degree of protection against falling dirt - against circulating dust, lint, fibers, and flyings - and against the spraying, splashing, and seepage of water, oil, and noncorrosive coolants.

For enclosures used in

Hazardous Locations

Type 7 : Class I, Group A, B, C or D Hazardous Locations - Indoor

  • Enclosures constructed for indoor use in hazardous locations classified as Class I, Division 1, Groups A, B, C, or D as defined in NFPA 70.

Type 8 : Class I, Group A, B, C or D Hazardous Location - Indoor &amp - Outdoor

  • Enclosures constructed for either indoor or outdoor use in hazardous locations classified as Class I, Division 1, Groups A, B, C, and D as defined in NFPA 70.

Type 9 : Class II, Group E, F or G Hazardous Locations - Indoor

  • Enclosures constructed for indoor use in hazardous locations classified as Class II, Division 1, Groups E, F, or G as defined in NFPA 70.

Type 10 : Requirements of Mine Safety and Health Administration

  • Enclosures constructed to meet the requirements of the Mine Safety and Health Administration, 30 CFR, Part 18.

For more detailed and complete information, NEMA Standards Publication 250-2003, Enclosures for Electrical Equipment (1000 Volts Maximum) should be consulted.

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