NEMA

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NEMA is an American national institute and was founded on 1st September 1929.
NEMA is the abbreviation for the National Electrical Manufacturers Association. This association of American manufacturers of electronic products promotes the standardisation of product specifications for electrical devices.
The NEMA performance criteria and test procedures are used by member laboratories (UL) as guidelines for the investigation and listing of electrical enclosures.
The NEMA standards specify tests for environmental conditions such as corrosion, rust, ice, oil and coolants. DIN EN 60529 does not do this, and neither does it specify the degree of protection against mechanical equipment damage. For this reason, and also because the tests and evaluations are not identical, the IP protection class designations cannot be exactly compared with the NEMA enclosure types. 

 

Comparison between NEMA and the IP protection class:

NEMA classification "internal"
Provides a degree of protection against the following ambient conditions 1 2 4 4X

5

6 6P 11 12 12X 13
Accidental contact with devices x x x x x x x x x x x
Falling contamination x x x x x x x x x x x
Falling and lightly spraying fluids x x x x x x x x x
Flying dust, lint and fibres x x x x x x x x
Spray and jets of water x x x x
Seeping oil and coolant x x x
Spraying and squirting oil or coolant x
Corrosive media x x x
Occasional temporary immersion x x
Occasional prolonged immersion x



Provides a degree of protection against the following ambient conditions 3 3R 3S 4 4X 6 6P
Accidental contact with devices x x x x x x x
Rain, snow and hail x x x x x x x
Hail x
Flue dust x x x x x x
Jets of water x x x x
Corrosive media x x
Occasional temporary immersion x x
Occasional prolonged immersion x



Comparison between NEMA and the IP protection classes
NEMA protection class IP protection class
1 IP20
2 IP21
3 IP54
3R IP24
3S IP54
4,4X IP56
5 IP52
6, 6P IP67
12, 12K IP52
13 IP54