With the Summer heat upon us here in Ohio the inquiries for our Cabinet Cooler Systems are increasing by the day. A question we always ask customers with Cabinet Cooler Sizing Guides is, “What NEMA Type is your enclosure?” There are quite a few times where no one truly knows what a NEMA rating is. So what exactly is a NEMA rating?
NEMA is the National Electrical Manufacturers Association, one of the many standards they publish is the NEMA rating standard for electrical enclosures up to 1000 Volts. This standard is where NEMA Types such as 12, 4, and 4X come from (you will also see an international standard reference as “IP”, more on that later). It categorizes the enclosures by their ability to protect the internal components from things such as corrosion, dust, oil, even external air quality. These standards are reviewed every five years and the last review was done in 2013. The reviews are generally based on improving safety, clarity of the standard, and testing methods.
So what NEMA ratings does EXAIR offer? For our Cabinet Cooler Systems, EXAIR offers three very common NEMA types to try an offer a selection to fit the needs that we most commonly encounter. The NEMA types and their descriptions are below. For a full list of the Non-hazardous location NEMA enclosure types, click on this link.
Type 12 (IP54): General purpose, indoor use. Protects against falling dirt and circulating dust, lint, fibers, and flyings. Protects against ingress of dripping and splashing water. Rust-resistant Type 12 enclosures do not include knockouts.
Types 4, 4X (IP66): Water-tight, dust-tight, sleet-resistant. Resistant to windblown dust. Indoor or outdoor use. Also provides protection against splashing and hose-directed water. The “X” designation indicates corrosion-resistance.
The EXAIR Cabinet Cooler Systems also reference an equivalent IEC (International Electrotechnical Commission), IP code. This is a code from the IEC system which specifies the ingress protection which classifies and rates the degree of protection provided against intrusion (body parts such as hands and fingers), dust, accidental contact, and water by mechanical casings and electrical enclosures. They are a two digit number that represents the level of protection against physical objects and he ingress of water. Coorelation between NEMA ratings and IP codes is not always possible. EXAIR has ensured that we also meet the equivalent IP codes shown in the NEMA descriptions above.
If you have a hot enclosure and you are not sure how much cooling is needed or what the NEMA type is, contact us. We will gladly help you gather the information needed to calculate the heat load requirements and help determine the correct NEMA rating.