Technical data

June 2005
184
For more information visit: www.EatonElectrical.ca CAT.02.02.S.K.CD
XT IEC Power Control
Reference Data
Enclosure Ratings
The UL, NEMA and IEC organizations
(and other international groups) define
degrees of protection provided by
electrical enclosures with respect to
personnel, equipment within the hous-
ing and the ingress of water.
Subtle differences do exist between
the test procedures and specifications
of these organizations.
To claim ratings to NEMA specifica-
tions, the testing is performed and cer-
tified by the manufacturers themselves.
To comply to UL and IEC specifica-
tions, the manufacturers must submit
product samples, materials used and
other data to an independent testing
laboratory before ratings can be
claimed.
In addition, IEC “IP” ratings differ from
NEMA in that they do not apply to pro-
tection against the risk of explosion or
conditions such as humidity, corrosive
gases, fungi or vermin. In addition, dif-
ferent parts of the equipment can have
different degrees of protection and still
comply.
Table 234 is a comparison of the
NEMA/UL/IEC enclosure specifications
to be used as an approximate refer-
ence only. Do not use the table to con-
vert from IEC to NEMA designations.
For a definition of the ratings listed,
see examples below and tables on
Page 185.
Table 234. NEMA/UL/IEC Enclosure Type Cross-Reference — Approximate
Note: IEC 529 does not specify equivalents to NEMA Enclosure Types 7, 8, 9 or 10.
Table 235. IEC Environmental Enclosure Ratings — Examples of Designations
NEMA
Enclo-
sure
Rating
IP10 IP20 IP21 IP22 IP23 IP30 IP31 IP32 IP33 IP40 IP41 IP42 IP43 IP50 IP51 IP52 IP53 IP54 IP55 IP56 IP60 IP61 IP62 IP63 IP64 IP65 IP66 IP67 IP68
1 XXXXX
2 XXXXX
3 XXXXXXXXXXXXXXXXXXXXXXXXX
3R XXXXXXXX
3S XXXXXXXXXXXXXXXXXXXXXXXXX
4 XXXXXXXXXXXXXXXXXXXXXXXXXXX
4X XXXXXXXXXXXXXXXXXXXXXXXXXXX
6 XXXXXXXXXXXXXXXXXXXXXXXXXXXX
6P XXXXXXXXXXXXXXXXXXXXXXXXXXXXX
12 XXXXXXXXXXXXXXXXXXXXXXXXXX
13 XXXXXXXXXXXXXXXXXXXXXXXXXX
Characteristic letters
1st characteristic numeral
(See Table 236 Next Page)
2nd characteristic numeral
(See Table 237 Next Page)
IP 4 4
An enclosure with this designation is protected against the
penetration of solid objects greater than 1.0 mm and against
splashing water.
Characteristic letters
1st characteristic numeral
(See Table 236 Next Page)
2nd characteristic numeral
(See Table 237 Next Page)
IP 2 3
An enclosure with this designation is protected against the
penetration of solid objects greater than 12 mm and against
splashing water.