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Tel: 1-800-WINTERS / www.winters.com WINTERS INSTRUMENTS100
Winters Approvals / Certifying Agencies
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.
NEMA
Type Seal Indoor/Outdoor Description
1 General Purpose Indoor Accidental contact will not rust
2 Drip-proof Indoor Limited amounts of falling water and dirt will not rust
3 Dust-tight, rain-tight Outdoor
Windblown dust, rain, sleet, and undamaged by external
ice formation
3R Dust-tight, rain-tight Outdoor
Same as type 3 above, plus diverts water from live parts,
provision for drainage, will not rust
3S Dust-tight, rain-tight Outdoor
Same as type 3 above, operation of external mechanism
when ice laden, will not rust
4 Water-tight, dust-tight Indoor/Outdoor
Windblown dust and rain, splashing water, and hose
directed water, undamaged by ice formation, will not rust
4X Water-tight, dust-tight Indoor/Outdoor
Same as type 4 above, plus corrosion resistant, will not
rust
5 Dust-tight Indoor Dust and falling dirt, will not rust
6 Water-tight/dust-tight Indoor/Outdoor
Temporary entry of water during limited submersion (6ft
for 30 Min), undamaged by formation of ice, will not rust
6P Water-tight/dust-tight Indoor/Outdoor
Same as type 6 above plus prolonged submersion at 6
psi, will not rust
7
Explosion proof/Class
I/Groups A, B, C, D
Indoor
Hazardous
Locations: Protection against corrosive effects of liquids
and gases
8
Explosion proof/
Class I
Indoor/Outdoor
Hazardous Locations: protection against corrosive effects
of liquids and gases; contacts or connections immersed
in oil
9
Explosion Proof/Class
II Groups E or G
Indoor
Hazardous
Locations: dust-tight, hazardous dust
10 Hazardous Locations Indoor
MSHA Mine Safety and Health Adm. per 30 C.F.R.,
Part 18
11 Oil-tight/Corrosion Indoor
Protection from corrosive effects of gases and liquid
dripping, seepage and external condensation or
corrosive, oil immersion
12 Oil-tight/Dust-tight Indoor
Fibers, lint, dust and light splashing, seepage and
dripping condensation or non-corrosive liquids
12K Oil-tight/Dust-tight Indoor Same as type 12 above, enclosure has knockouts
13 Oil-tight/Dust-tight Indoor
Dust, spraying of water, oil and corrosive coolant, oil
resistant gaskets