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NEMA Types of Enclosures

Enclosures For Non-Hazardous Locations

Type 1 General-Purpose-Indoor
Type 2 Dripproof-Indoor
Type 3 Dust-Tight, Rain-Tight and Sleet - (Ice) Resistant - Outdoor
Type 3R Rainproof and Sleet - (Ice) Resistant - Outdoor
Type 3S Dust-Tight, Rain-Tight and Sleet - (Ice) Proof - Outdoor
Type 4 Watertight and Dust-Tight - Indoor and Outdoor
Type 4X Watertight, Dust-Tight and Corrosion
Resistant - Indoor and Outdoor
Type 5 Superseded by Type 12 for Control Apparatus
Type 6 Submersible, Watertight, Dust-Tight and
Sleet (Ice) Resistant Indoor and Outdoor
Type 11 Corrosion-Resistant and Drip-proof - Oil-Immersed - Indoor
Type 12 Industrial Use - Dust-Tight and Drip-Tight - Indoor
Type 13 Oil-Tight and Dust-Tight - Indoor

Enclosures For Hazardous Locations

Type 7 Class I, Group A, B, C or D - Indoor Hazardous
Locations Air-Break Equipment
Type 8 Class I, Group A, B, C or D - Indoor Hazardous
Locations Oil-Immersed Equipment
Type 9 Class II, Group E, F or G - Indoor Hazardous
Locations Air-Break Equipment
Type 10 Bureau of Mines

NOTE: When hazardous locations are specified, the type must be followed by correct Group Letter(s).

 

Definitions Pertaining to Non-Hazardous Locations

Type 1 Enclosures are intended for indoor use primarily to provide a degree of protection against contact with the enclosed equipment.

Type 2 Enclosures are intended for indoor use primarily to provide a degree of protection against limited amounts of falling water and dirt.

Type 3 Enclosures are intended for outdoor use primarily to provide a degree of protection against windblown dust, rain, sleet, and external ice formation.

Type 3R Enclosures are intended for outdoor use primarily to provide a degree of protection against falling rain, sleet, and external ice formation.

Type 3S Enclosures are intended for outdoor use primarily to provide a degree of protection against windblown dust, rain, sleet, and to provide for operation of external mechanisms when ice laden.

Type 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.

Type 4X Enclosures are intended for indoor or outdoor use primarily to provide a degree of protection against corrosion, windblown dust and rain, splashing water, and hose-directed water.

Type 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.

Type 6 Enclosures are intended 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.

Type 6P Enclosures are intended for indoor or outdoor use primarily to provide a degree of protection against the entry of water during prolonged submersion at a limited depth.

Type 11 Enclosures are intended for indoor use primarily to provide, by oil immersion, a degree of protection to enclosed equipment against the corrosive effects of liquids and gases.

Type 12 Enclosures are intended for indoor use primarily to provide a degree of protection against dust, falling dirt, and dripping non-corrosive liquids.

Type 12K Enclosures with knockouts are intended for indoor use primarily to provide a degree of protection against dust, falling dirt, and dripping non-corrosive liquids other than at knockouts.

Type 13 Enclosures are intended for indoor use primarily to provide a degree of protection against dust, spraying of water, oil, and non-corrosive coolant.

 

Definitions Pertaining to Hazardous (Classified) Locations

Type 7 Enclosures are for use indoors in locations classified as Class I, Groups A, B, C or D, as defined in the National Electrical Code.

Type 8 Enclosures are for indoor or outdoor use in locations classified as Class I, Groups A, B, C, or D, as defined in the National Electrical Code.

Type 9 Enclosures are for use in indoor locations classified as Class II, Groups E, F, Or G, as defined in the National Electrical Code.

Type 10 Enclosures are constructed to meet the applicable requirements of the Mine Safety and Health Administration.

 

General Definitions Pertaining to Enclosures

Apparatus is the enclosure, the enclosed equipment, and the attached protruding accessories.

Design Tests demonstrate performance of a product designed to applicable standards; they are not intended to be production test.

Flush Mounting means so constructed as to have a minimal front projection when set into a recessed opening and secured to a flat surface.

Hazardous (Classified) Locations are those areas which may contain hazardous (classified) materials in sufficient quantity to create an explosion. See article 500 of the National Electrical Code.

Hazardous Materials are those gases, vapors, combustible dust, fibers, or flyings which are explosive under certain conditions.

Indoor Locations are those areas which are protected from exposure to the weather.

Knockout is a portion of the wall of an enclosure so fashioned that it may be removed readily by a hammer, screwdriver, and pliers at the time of installation in order to provide a hole for the attachment of an auxiliary device or raceway, cable, or fitting.

Non-Ventilated means so constructed as to provide no intentional circulation of external air through the enclosure.

Oil-Resistant Gaskets are those made of material which is resistant to oil or oil fumes.

Outdoor Locations are those areas which are exposed to the weather.

Surface Mounting means so constructed as to be secured to, and projected from a flat surface.

Ventilated means to constructed as to provide for the circulation of external air through the enclosure to remove excess heat, fumes, or vapors.