NEMA Ratings: Environmental Considerations for Electrical Cabinets

NEMA 4 Cabinet Cooler

The first step to solving your overheating problem is to identify the NEMA integrity your enclosure will require. The National Electrical Manufacturers Association (NEMA) uses a standard rating system defining the types of environments that electrical enclosures should be rated. EXAIR has 3 NEMA Ratings to consider before selecting the proper Cabinet Cooler.

NEMA 12 (IP54) Cabinet Coolers rated for dust tight and oil tight. NEMA 12 cabinet coolers are ideal for general industrial environments where no liquids or corrosives are present.

NEMA 4 (IP66) Cabinet Coolers rated for dust tight, oil tight, splash resistant and indoor/outdoor service. These cabinet coolers incorporate a low pressure relief valve for both the vortex tube and cabinet exhaust. This valve closes and seals when the cooler is not operating to maintain the integrity of a NEMA 4 enclosure.

NEMA 4X (IP66) Cabinet Coolers offer the same protection as the NEMA 4 but are constructed of stainless steel for food service and corrosive environments.

For additional reference, you will notice that each NEMA rating has an “IP” rating as well. Ingress Protection (IP) ratings are an international standard comparable to NEMA ratings. They are used to define levels of sealing effectiveness for electrical enclosures against intrusion from foreign bodies and moisture. The first digit after “IP”, which ranges from 1 – 6, specifies the protection rating from solids and the second digit, which ranges from 1 – 8, specifies the protection rating from water. The table below shows the ratings:

EXAIR has Cabinet Coolers from stock with a variety of cooling capacities in NEMA 12 (IP54), NEMA 4 (IP66) and NEMA 4X (IP66) ratings. Once you know the NEMA/IP rating of the cabinet cooler you need please utilize our Cabinet Cooler Sizing Guide or give any one of our Application Engineers a call as we are ready to help.

Eric Kuhnash
Application Engineer
E-mail: EricKuhnash@EXAIR.com
Twitter: @EXAIR_EK

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