Nema and UL Classifications

NEMA CLASSIFICATIONS OF PROTECTION

The National Electrical Manufacturers Association (NEMA) is a Manufacturers Organization that actively promotes standardized product specifications for electrical apparatus.

The National Electrical Manufacturers Association, also known as NEMA, is one of the most prestigious and preferred trade associations for electrical product manufacturers.  The products are used for medical, institutional, commercial, residential and industrial applications. NEMA standards deal with the manufacture, performance testing, application and rating of various electrical products.  Industrial enclosures are typically given a NEMA rating to insure it meets the requirements of the environment where the box will be installed.  NEMA defines the requirements for electrical enclosures under NEMA Standard Number 250

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)
NEMA 2:
Indoor use to provide a degree of protection against limited amounts of falling water and dirt. (IP31)
NEMA 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)
NEMA 3R: Outdoor use to provide a degree of protection against falling rain and sleet: undamaged by the formation of ice on the enclosure. (IP32)
NEMA 3S: Outdoor use to provide a degree of protection against windblown dust, rain and sleet; external mechanisms remain operable while ice laden.
NEMA 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)
NEMA 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)
NEMA 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.
NEMA 6P: Indoor and outdoor use to provide a degree of protection against the entry of water during prolonged submersion at a limited depth.
NEMA 12: Indoor use to provide a degree of protection against dust, falling dirt and dripping noncorrosive liquids. (IP65)
NEMA 12K: Indoor use to provide a degree of protection against dust, falling dirt and dripping noncorrosive liquids. (IP65) (with knock-outs)
NEMA 13: Indoor use to provide a degree of protection against dust and spraying of water, oil and noncorrosive coolants. (IP65)

Adhering to NEMA standards and using products that meet the needed standards affords many benefits to your product design, brand, and company.  You can also have confidence the products that meet the NEMA standard to be safe and operable.  This eliminates the risk and worry that comes with using non-rated products, and increases your ROI.

 

 

 

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