|
Type Designation |
National Electrical
Manufacturer's Association
(NEMA Standard 250) |
Underwriter's
Laboratories Inc.
(UL 50 and UL 508) |
Canadian Standards
Association
(Standard C22.2, Nos. 14, 40 and 94) |
|
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 dirt. |
General
purpose enclosure. Protects against accidental
contact with live parts. |
|
2 |
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. |
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. |
Indoor
use to provide a degree of protection against
limited amounts of falling water and dirt. |
|
3 |
Enclosures are intended for outdoor use primarily to
provide a degree of protection against windblown
dust, rain, sleet, and
external ice formation. |
Outdoor
use to provide a degree of protection against
windblown dust, rain, and sleet; undamaged by the
formation of ice on the enclosure. |
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. |
|
3R |
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). |
Outdoor
use to provide a degree of protection against
windblown dust, rain, and sleet; undamaged by the
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. |
|
4 |
Enclosures are intended for use indoors or outdoors,
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. |
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. |
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. |
|
4X |
Type 4X
enclosures have the same provisions as Type 4
enclosures and, in addition, are
corrosion-resistant. |
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;
resists corrosion. |
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. |
|
6 |
Enclosures are
intended for use indoors or outdoors where
occasional submersion is encountered. limited depth;
undamaged by the formation of ice on the enclosure. |
Indoor or outdoor use
to provide a degree of protection against entry of
water during temporary submersion at a at a limited
depth; undamaged by the external formation of ice on
the enclosure. |
Indoor or outdoor use; provides a degree of
protection against the entry of water during
temporary submersion at a limited depth. Undamaged
by the external formation of ice on the enclosure;
resists corrosion. |
|
12 |
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. |
Indoor
use to provide a degree of protection against dust,
falling dirt, and dripping non-corrosive liquids. |
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. |
|
13 |
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 to provide a degree of protection against dust
and spraying of water, oil, and
non-corrosive coolants. |
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. |
|
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. |
I.P.
Ingress Protection Classifications to DIN VDE
0470/EN 60529*
The protection classification offered by an
enclosure is shown by the letters IP Ingress
Protection, and two digits. The first digit
indicates two factors (protection for persons and
equipment). The second digit indicates only one
factor, protection against water.
Similarly, changes in temperature, as may occur, for
example, in the open air, are not taken into
account. Such changes in temperature may cause a
loss of pressure in the enclosure, and dampness may
be absorbed through the seal area.
|
Digit |
Persons |
Equipment |
|
Brief
Description |
Definition |
Brief
Description |
Definition |
|
0 |
Not
protected |
- |
Not
protected |
- |
|
1 |
Protection
against the
back of the hand touching
dangerous parts |
A round
body, 50mm in
diameter, must be at a
sufficient distance from dangerous parts |
Protection
against a
solid foreign body of
50mm or more
in diameter |
A round
body, 50mm
in diameter, must
not fully penetrate |
|
2 |
Protection
against a
finger touching
dangerous parts |
The test
finger, jointed, 12mm in diameter and
80mm long, must be at a sufficient
distance from dangerous parts |
Protection
against a solid foreign body of 12.5mm
or more
in diameter |
A round
body, 12.5mm in diameter, must
not penetrate at all |
|
3 |
Protection
against
a tool touching
dangerous parts |
A body,
2.5mm in
diameter, must not be able to penetrate |
Protection
against a solid foreign body of 2.5mm or
more
in diameter |
A round
body, 2.5mm in diameter, must
not penetrate at all |
|
4 |
Protection
against
a wire touching
dangerous parts |
A body,
1.0mm in
diameter, must not be able to penetrate |
Protection
against a solid foreign body of 1.0mm or
more
in diameter |
A round
body, 1.0mm in diameter, must not
penetrate at all |
|
5 |
Protection
against
a wire touching
dangerous parts |
A body,
1.0mm in
diameter, must not be able to penetrate |
Protection
against dust |
No dust
penetration |
|
6 |
Protection
against
a wire touching
dangerous parts |
A body,
1.0mm in
diameter, must not be able to penetrate |
Sealed
against dust |
No dust
penetration |
1)Dust
must not penetrate in sufficient
quantities to prevent the equipment from
operating satisfactorily, or to impair
safety.
Important note: The protection classifications given for the
enclosures refer to unmachined enclosures as supplied. In
the case of protection against water in
particular (second digit), the test
conditions will be met if during the
given time for the experiment no water
has penetrated, or not in harmful
quantities. As the tests to show
protection classifications take no
account of ageing, the maintenance of
the protection classification throughout
the lifetime of the equipment is not
guaranteed. We assume no liability
for quoted standards.
I.P. Ingress Protection Classifications to DIN VDE 0470/EN
60529*
Example: IP54 –first digit 5= protection against dust and
wire contact with dangerous parts
–second digit 4= protection against splashing water
|
|
Digit |
Brief
Description |
Definition |
|
0 |
Not protected |
- |
|
1 |
Protection against vertical water drops |
Drops of water falling vertically onto the enclosure must not
have any harmful effects |
|
2 |
Protection
against vertical water drops when the enclosure is inclined at
15º |
Drops of water
falling vertically onto the enclosure must not have any harmful
effects if the enclosure is inclined by up to 15º on both sides
of the vertical |
|
3 |
Protection
against water spray |
Water sprayed
onto the enclosure at up to 60º on both sides of the vertical
must not have any harmful effects |
|
4 |
Protection
against water drops 360 degree |
Water splashed
onto the enclosure
from any direction must
not have any harmful effects |
|
5 |
Protection
against water jet |
Water splashed
onto the enclosure
from any direction must
not have any harmful effects |
|
6 |
Protection
against powerful water jet |
A strong water
jet directed at the
enclosure from any direction must
not have any harmful effects |
|
7 |
Protection
against the effect of
temporary immersion in water |
Water must not
enter in a quantity that could
have harmful effects if the enclosure is
temporarily immersed in water under
standardized pressure and time conditions |
|
8 |
Protection
against
the effects of constant
submersion in water |
Water must not
enter in a quantity that could have harmful effects if the
enclosure is kept permanently under water under conditions
agreed between the manufacturer and the user; however, these
must be more severe that those under figure 7 |
|
Comparison of NEMA and IEC Standards ENCLOSURE TYPES
European IEC
specifications 144 & 529 define the degree of protection
provided electrical enclosures to safeguard personnel
against electric shock and equipment within the
enclosure from environmental contamination such as entry
of water. This is expressed by the letters IP followed
by two numerals.
In the USA, NEMA and UL have established a rating system
for enclosures which provided for different levels of
protection. A direct comparison between IEC and NEMA is
not possible but the following table gives an
approximate guide.
NEMA TO IEC
Enclosure Rating Comparison
NEMA
TYPE |
IP 23 |
IP 30 |
IP 32 |
IP 64 |
IP 65 |
IP 66 |
IP 67 |
|
1 |
• |
|
|
|
|
|
|
|
2 |
|
• |
|
|
|
|
|
|
3 |
|
|
|
• |
|
|
|
|
3R |
|
|
• |
|
|
|
|
|
4 |
|
|
|
|
|
• |
|
|
4X |
|
|
|
|
|
• |
|
|
6 |
|
|
|
|
|
|
• |
|
12 |
|
|
|
|
• |
|
|
|
13 |
|
|
|
|
• |
|
|
Note: This
comparison table is an approximation of NEMA and IEC
classifications and is for reference only. Complete
standards should be obtained from the appropriate
association or agency.
|
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