UL & NEMA Ratings Chart - Mencom Corporation
UL & NEMA RATINGS
for enclosures Underwriters Laboratories
National Electric Manufacturer's Association
Source:
Protection Against
Non-Hazardous Locations
Indoor
Indoor/outdoor
1 2 5 12 12K 13 3 3S 3R 4 4X 6 6P
INCIDENTAL CONTACT
S
FALLING DIRT
O
L
I CIRCULATING DUST
D
S
SETTLING AIRBORNE DUST
WINDBLOWN DUST
1 2 5 12 12K 13 3 3S 3R 4 4X 6 6P
LIGHT SPLASH
L HOSEDOWN & SPLASH I Q U TEMPORARY SUBMERSION I D S
PROLONGED SUBMERSION
RAIN, SNOW & SLEET
ICE LADEN
1 2 5 12 12K 13 3 3S 3R 4 4X 6 6P
C H E
OIL & COOLANT SEEPAGE
M I C A OIL & COOLANT SPLASH L S
CORROSION
IEC 60529
IP IP IP
IP
Cross-Reference 20 22 53
54
IP
IP
IP
IP IP
55 24 66 67 68
Note: The UL/NEMA enclosure type numbers meet or exceed the test requirements for the associated IEC Classification; for this reason the chart above cannot be used to convert from IEC Classifications to UL/NEMA enclosure type numbers.
Underwriters Laboratories
Safety Consulting and Certification Company
Requires compliance testing of electrical enclosures by qualified evaluators independent of the manufacturer
Sends site inspectors to manufacturers ensure adherence to prescribed manufacturing methods and materials specifications
Specifies that an enclosure fails the water-tight test if even a single drop of water enters the enclosure
National Electrical Manufacturers Association
The most prevalent in the USA
Not requires Independent testing
Leaves compliance up to the manufacturer
Performs tests for environmental conditions such as corrosion, rust, icing, oil, and coolants
International Electrotechnical Commission iec.ch
The most prevalent in the world
Requires testing for compliance by qualified evaluators independent of the manufacturer
Provides a system for specifying the enclosures of electrical equipment on the basis of the degree of protection
Not specifies degree of protection against mechanical damage of equipment, risk of explosions, or conditions such as moisture (produced, for example, by condensation), corrosive vapors, fungus, or vermin
The tests and evaluations for other characteristics are not identical between the standards, so the IEC Enclosure Classification Designations cannot be exactly equated with UL/NEMA Enclosure Type Numbers.
For more information, visit
Mencom, the industry leader in Panel Interface Connectors, has well over 3,000 designs in production that provide safety, convenience and flexibility for programmers and trouble-shooters. Also we have a team of engineers with decades of experience. Combined with a progressive manufacturing facility, we are not only ready to provide a solution but also able to assist challenging connectivity issues from small changes to custom terminations & assemblies with affordable costs and fast turnaround.
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