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NEMA Enclosure Ratings
Air conditioners typically carry an agency marking such as UL (Underwriters Laboratories), which designates the environmental hazard from which the contents are being protected. This marking should be matched to the enclosure to be cooled. Typical examples include NEMA 12, (indoor use, protection from dust and dripping liquids), NEMA 3R, (outdoor use and rainproof) and NEMA 4 (outdoor or indoor use, protection from wash-down) and NEMA 4X (protection from corrosive environments).

 

Environments:
NEMA 1
NEMA 3R
NEMA 4
NEMA 4X
NEMA 5
NEMA 6
NEMA 6P
NEMA 12
NEMA 13
Kooltronic Offers Solution*
 
 
 
Indoor use only
 
 
 
 
 
Indoor and outdoor use
 
 
 
 
Falling liquids and light splashing
 
 
Non-hazardous dust, lint, fibers
 
 
Washdowns and splashing water
 
 
 
 
 
Oil and coolant seepage
 
 
 
 
 
 
 
Oil and coolant spraying and splashing
 
 
 
 
 
 
 
 
Corrosive agents
 
 
 
 
 
 
 
Occasional temporary submersion
 
 
 
 
 
 
 
Occasional prolonged submersion
 
 
 
 
 
 
 
 


NEMA 7 and NEMA 9 enclosures are rated for hazardous locations; both are for indoor use. NEMA 7 enclosures are designed to contain an internal explosion without causing an external hazard. NEMA 9 enclosures are designed to prevent the ignition of combustible dust.

* Kooltronic’s custom design capabilities offer cooling solutions for situations that fall under these NEMA ratings. We can develop a unique design to meet your particular requirements. Consult with Kooltronic’s design and engineering staff to discuss your heat dissipation problems.

 
 
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