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156
Protection Classifications
Standards Comparison:
NEMA, UL, CSA Standard Enclosures
National Electrical
Manufacturers’ Association
(NEMA Standard 250)
1
Enclosures are intended for use indoors,
primarily to prevent accidental contact of
personnel with the enclosed equipment in
areas where unusual service conditions do
not exist.
Indoor use primarily to provide a degree of
protection against contact with the enclosed
equipment and against a limited amount of
falling water and dirt.
Enclosures are intended for outdoor use
primarily to provide a degree of protection
against windblown dust, rain, sleet, and
external ice formation.
Enclosures are intended for outdoor use
primarily to provide a degree or protection
against windblown falling rain, sleet, and
external ice formation. (May be ventilated).
Enclosures are intended for use indoors or
out doors, to protect the enclosed equipment
against splashing water, seepage of water,
falling or hose directed water, and severe
external condensation. They are sleet
resistant but not sleet (ice) proof.
Type 4X enclosures have the same provisions
as Type 4 enclosures and, in addition, are
corrosion-resistant.
Enclosures are intended for use indoors to
protect the enclosed equipment against fibers,
flyings, lint, dust, and dirt, and light splashing,
seepage, dripping and external condensation
of non-corrosive liquids.
Enclosures are intended for use indoors
primarily to house pilot devices such as limit
switches, foot switches, pilot lights, etc., and
to protect these devices against lint and dust,
seepage, external condensation, and spraying
of water, oil, and coolant.
Indoor use primarily to provide a degree of
protection against contact with the enclosed
equipment and against a limited amount of
falling dirt.
An enclosure for indoor use, constructed so
as to provide a degree of protection against
dripping and light splashing of non-corrosive
liquids, and falling dirt.
Outdoor use to provide a degree of protection
against windblown dust, rain, and sleet;
undamaged by the formation of ice on the
enclosure.
Outdoor use to provide a degree of protection
against windblown dust, rain, and sleet;
undamaged by the formation of ice on the
enclosure.
Indoor or outdoor use to provide a degree of
protection against splashing water, windblown
dust and rain, and hose-directed water;
undamaged by the formation of ice on the
enclosure.
Indoor or outdoor use to provide a degree of
protection against splashing water, windblown
dust and rain, and hose-directed water;
undamaged bythe formation of ice on the
enclosure; resists corrosion.
Indoor use to provide a degree of protection
against dust, falling dirt, and dripping
non-corrosive liquids.
Indoor use to provide a degree of protection
against dust and spraying of water, oil, and
non-corrosive coolants.
General purpose enclosure. Protects against
accidental contact with live parts.
Indoor use to provide a degree of protection
against limited amounts of falling water
and dirt.
An enclosure for either indoor or outdoor use,
constructed so as to provide a degree or
protection against rain, snow, and windblown
dust; undamaged by the external formation
of ice on the enclosure.
An enclosure for either indoor or outdoor use,
constructed so as to provide a degree of
protection against rain, snow, windblown dust,
splashing and hose-directed water; undamaged
by the external formation of ice on the enclosure.
An enclosure for either indoor or outdoor use,
constructed so as to provide a degree of
protection against rain, snow, windblown dust,
splashing and hose-directed water;
undamaged by the external formation of ice
on the enclosure.
An enclosure for either indoor or outdoor use,
constructed so as to provide a degree of
protection against rain, snow, windblown dust,
splashing and hose-directed water;
undamaged by the external formation of
ice on the enclosure; resists corrosion.
An enclosure for indoor use, constructed so
as to provide a degree of protection against
circulating dust, lint, fibers, and flyings;
drippings and light splashing of non-corrosive
liquids; not provided with knockouts.
An enclosure for indoor use, constructed so
as to provide a degree of protection against
circulating dust, lint, fibers, and flyings;
seepage and spraying of non-corrosive
liquids including oils and coolants.
2
3
3R
4
4X
12
13
Underwriters’
Laboratories Inc.
(UL 50 and UL 508)
Canadian Standards
Association
(Standard C22.2, Nos. 14, 40 and 94)
Please Note: The information presented here is for reference only and is not meant to be a definitive description of the test requirements and/or qualifications.
The complete standards should be obtained from the appropriate association or agency.
Type
Designation
