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NEMA Control Enclosure Standards

NEMA Type* NEMA Definition* Application for NEMA Enclosures*
1 Enclosures are intended for indoor use primarily to provide a degree of protection against contact with the enclosed equipment in areas where unusual service conditions do not exist. Enclosures are suitable for general application indoors, where atmospheric conditions are normal. These enclosures provide limited protection against falling dust, but are not dust tight.
2 Enclosures are intended for indoor use primarily to provide a degree of protection against limited amounts of failing dust and water. NEMA Standard 1-10-1979 Drip-tight (indoor) enclosures are similar to Type 1 enclosures,with the addition of drip shields, and are suitable for application where condensation may be severe, such as that encountered in cooling rooms or laundries.
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 Suitable for applications outdoors on ship docks, canal locks, construction work and for application in tunnels and subways. Use indoors where dripping water is a problem
3R Enclosures are intended for outdoor use primarily to provide limited protection against falling rain, sleet and external ice formation. (May be ventilated). NEMA Standard 1-10-1979 Outdoor use to provide a degree of protection against falling rain and sleet; undamaged by the formation of ice on the enclosure.
4 Enclosures are intended for indoor or outdoor use primarily to provide a degree of protection against windblown dust and rain, splashing water, and hose-directed water. NEMA Standard 1-10-1979 Water tight enclosures are suitable for dairies, breweries,etc., where they are subjected to large amounts of water from any angle. (They are not submersible)
4X Enclosures are 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 Corrosion resistant enclosures satisfy the requirements of Type 4, and are sutable for food processing plants, dairies, refineries, and any other industries where corrosion is prominent.
5 Enclosures are intended for indoor use primarily to provide a degree of protection against settling airborne dust, falling dirt and dripping non-corrosive liquids. NEMA Standard 5-25-1988  
6 Enclosures are for indoor or outdoor use primarily to provide a degree of protection against the entry of water, during occasional, temporary submersion at a limited depth. NEMA Standard 1-10-1979 Submersible enclosures are suitable for application where the equipment may be subject to submersion, such as quarries, mines and manholes. The enclosure design will depend upon the specified conditions of pressure and time.
7 Enclosures are for indoor use in locations that are classified as Class I, Groups A,B,C or D, as defined in the National Electric Code. NEMA Standard 1-10-1979 Hazardous areas indoor classified as shown.
8 Enclosures are for indoor or outdoor use in locations that are classified as Class I, Groups A,B,C or D, as defined in the National Electrical Code. NEMA Standard 1-10-1979 Hazardous areas indoor or outdoor classified as shown.
9 Enclosures are for indoor use in locations classified as Class II, Groups E,F, or G, as defined in the National Electrical Code. NEMA Standard 5-19-1986 Hazardous areas indoor enclosures classified as Class II, Group E, F, or G.
12 Enclosures are intended for indoor use primarily to provide a degree of protection against dust, falling dirt and dripping non-corrosive liquids. NEMA Standard 1-10-1979 Indoor uses to protect the equipment against fibers flyings, lint, dust, and light splashing, seepage, dripping, and external condensation of non-corrosive liquids.
13 Enclosures are intended for indoor use primarily to provide a degree of protection against dust, spraying of water, oil, and non-corrosive coolant. NEMA Standard 1-10-1979 Indoor enclosures intended primarily to house pilot devices such as limit switches, push buttons, selector switches, pilot lights, etc., and to protect these devices against lint and dust, seepage, external condensation, and spraying of water, oil, and coolant.
*Caution: The specifications and information on this page are for reference only and are not intended to provide the complete requirements and qualifications published by the National Electrical Manufacturers Association (NEMA). Complete information may be obtained by contacting NEMA. Do not rely upon information contained in this table.
Caution: All dimensions and other information in this web are subject to change without notice. Use for preliminary reference only, and then call Ace before ordering. When dimensions are critical, request a certified print.
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