NEMA CLASSIFICATIONS


Certain Winters products (i.e. pressure transmitters and pressure switches) can be classified per the National Electrical Manufacturer’s Association Enclosure (NEMA) classifications. NEMA is a non-profit trade organization composed of manufacturers of electrical power apparatus.

NEMA created voluntary standards for electrical enclosures. These classifications describe the environment in which the product can be used due to the protection the enclosure provides. (“Enclosure” includes electrical and mechanical connections and external adjustments). Among others, NEMA classifies enclosures based on the effects of external icing, corrosion and rusting, or contamination from oil and coolants.

Pressure switches, transmitters and other electronic products may also be classified according to the voluntary standards set by NEMA for electrical enclosures.

Type 1
General Purpose, Indoor

Protection against ingress of solid foreign objects (falling dirt)

Type 2
Drip-proof, Indoor

Protection against ingress of solid foreign objects (falling dirt); and protection
against ingress of water (dripping and light splashing)

Type 3
Dust-tight/rain-tight, Outdoor

Protection against ingress of solid foreign objects (falling dirt and windblown
dust); protection against ingress of water (rain, sleet, snow); and that will be
undamaged by the external formation of ice on the enclosure

Type 3R
Dust-tight/rain-tight, Outdoor

Protection against ingress of solid foreign objects (falling dirt); protection
against ingress of water (rain, sleet, snow); and that will be undamaged by the
external formation of ice on the enclosure

Type 4
Water-tight/dust-tight, Indoor/Outdoor

Protection against ingress of solid foreign objects (falling dirt and windblown
dust); protection against ingress of water (rain, sleet, snow, splashing water,
and hose directed water); and that will be undamaged by the external
formation of ice on the enclosure

Type 4X
Water-tight/dust-tight, Indoor/Outdoor

Protection against ingress of solid foreign objects (windblown dust); protection
against the ingress of water (rain, sleet, snow, splashing water, and hose
directed water); protection against corrosion; and that will be undamaged by
the external formation of ice on the enclosure

Type 5
Dust-tight, Indoor

Protection against ingress of solid foreign objects (falling dirt and settling
airborne dust, lint, fibers, and flyings); protection against ingress of water
(dripping and light splashing)

Type 6
Water-tight/dust-tight, Indoor/Outdoor

Protection against ingress of solid foreign objects (falling dirt); protection
against ingress of water (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
Water-tight/dust-tight, Indoor/Outdoor

Protection against ingress of solid foreign objects (falling dirt); protection
against ingress of water (hose directed water and the entry of water during
prolonged submersion at a limited depth); that provides an additional level of
protection against corrosion and that will be undamaged by the external
formation of ice on the enclosure

Type 7
Explosion proof/Class I Groups A, B, C, D, Indoor

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

Type 8
Explosion proof/Class I, Indoor/Outdoor

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

Type 9
Explosion Proof/Class II Groups E or G, Indoor

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

Type 11
Oil-tight/Corrosion, Indoor

Protection from corrosive effects of gases and liquid dripping, seepage and
external condensation or corrosive, oil immersion

Type 12
Oil-tight/Dust-tight, Indoor

Protection against ingress of solid foreign objects (falling dirt and circulating
dust, lint, fibers, and flyings); protection against ingress of water (dripping and
light splashing)

Type 13
Oil-tight/Dust-tight, Indoor

Protection against ingress of solid foreign objects (falling dirt and circulating
dust, lint, fibers, and flyings); protection against ingress of water (dripping and
light splashing); protection against the spraying, splashing, and seepage of oil
and non-corrosive coolants

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