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Wednesday, September 28, 2016
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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 (indoor or outdoor use and rainproof), NEMA 4 (indoor or outdoor use, protection from washdown) and NEMA 4X (protection from corrosive environments).

 

Environments:
NEMA 1
NEMA 12
NEMA 3R
NEMA 4
NEMA 4X
Indoor use only
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Indoor and outdoor use
 
 
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Falling liquids and light splashing
 
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Non-hazardous dust, lint, fibers
 
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Washdowns and splashing water
 
 
 
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Oil and coolant seepage
 
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Corrosive agents
 
 
 
 
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