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NEMA CLASSIFICATIONS OF PROTECTION

The National Electrical Manufacturers Association (NEMA) is a US Manufacturers Organisation which actively promotes standardized product specifications for electrical apparatus.

NEMA performance criteria and test methods are used by Underwriters' Laboratories as guidelines for investigation and listing of electrical enclosures.

Approximate IP equivalents in parentheses

 

NEMA
1:
 Indoor use primarily to provide a degree of protection against contact with the enclosed
 equipment and against a limited amount of falling dirt. (IP30)
2:  Indoor use to provide a degree of protection against limited amounts of falling water
 and dirt. (IP31)
3:  Outdoor use to provide a degree of protection against windblown dust, rain, and sleet;
 undamaged by the formation of ice on the enclosure. (IP64)
3R:  Outdoor use to provide a degree of protection against falling rain and sleet: undamaged
 by the formation of ice o the enclosure. (IP32)
3S:  Outdoor use to provide a degree of protection against windblown dust, rain and sleet;
 external mechanisms remain operable while ice laden.
 4:  Indoor or outdoor use to provide a degree of protection against splashing water,
 windblown dust and rain, hose directed water; undamaged by the formation of ice on
 the enclosure. (IP66)
 4X:  Indoor or outdoor use to provide a degree of protection against splashing water,
 windblown dust and rain, hose directed water; undamaged by the formation of ice
 on the enclosure, resists corrosion. (IP66)
 6:  Indoor or outdoor use to provide a degree of protection against the entry of water
 during temporary submersion at a limited depth; undamaged by the formation of
 ice on the enclosure.
 6P:  Indoor and outdoor use to provide a degree of protection against the entry of water
 during prolonged submersi at a limited depth.
 11:  Indoor use to provide by oil immersion a degree of protection of the enclosed equipment
 against the corrosive effects of corrosive liquids and gases.
 12,12K:  Indoor use to provide a degree of protection against dust, falling dirt and dripping
 noncorrosive liquids. (IP65)
 13:  Indoor use to provide a degree of protection against dust and spraying of water, oil and
 noncorrosive coolants. (IP65

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