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Protection Classifications
Comparison of NEMA and IEC Standards
ENCLOSURE TYPES
Europe 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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