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 : Dusttight, Raintight, Sleettight - 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 : Raintight, 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 : Dusttight, Raintight, Sleettight - 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, Dusttight, Sleet Resistant - Indoor & 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, Dusttight, Corrosion-Resistant - Indoor & 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 : Dusttight, 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 & 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 & 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 : Dusttight and Driptight - 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 : Dusttight and Driptight, 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 : Oiltight and Dusttight - 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 & 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 NFPA70.

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.

其與IP等級的大致對應(yīng)表格如下：