Honeywell ST 3000 - Manual (Page 104)

B.3 Enclosure Ratings,
Continued
IEC Designations,
continued Table B-6 provides an approximate conversion from NEMA enclosure
type numbers to IEC enclosure classification designations. The NEMA
types meet or exceed the test requirements for the associated IEC
classifications; for this reason the Table cannot be used to convert
from IEC classifications to NEMA types.
Table B-6 NEMA Enclosure Type Numbers and Comparable IEC
Enclosure Classification
NEMA Enclosure
Type Number
IEC Enclosure
Classification Designation
1 IP 10
2 IP 11
3 IP 54
3R IP 14
3S IP 54
4 and 4X IP 56
5 IP 52
6 and 6P IP 67
12 and 12K IP 52
13 IP 54
NOTE: This comparison is based on tests specified in IEC Publication 529
94 ST 3000 Release 300 Installation Guide 2/05