DDB NEMA 3R Enclosures
DDB Unlimited Enclosures are third party rated; there's a reason for this...
NEMA 3R Enclosures There are fundamental differences between an enclosure that is “NEMA Rated” by a company solely; without third-party evaluation and one that is “Listed” to a Type Rating by a National Regulatory Testing Lab for a company. A National Regulatory Testing Lab, such as UL or Intertek, are independent, third party labs that test enclosures, under controlled conditions, to the environmental “Type” rating given, such as a Type 4 or Type 3R. The NEMA 250 Standard, is a set of guidelines that enclosure manufacturers follow to properly separate enclosures into their respective Type classes for marketing. The NEMA Standard absolves itself from liability, leaving the manufacturer to adhere to the guidelines and the consumer to trust these guidelines have been complied with.
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NEMA 3 and 3R Ratings
| Protection Against the Following Conditions | NEMA 3 | NEMA 3R |
|---|---|---|
| Indoor Use | ||
| Outdoor Use | ||
| Access to hazardous parts | ||
| Ingress of solid foreign objects | ||
| Falling dirt | ||
| Circulating dust, lint, fibers, and flyings ** | ||
| Setting airborne dust, lint, fibers, and flyings ** | ||
| Windblow dust, lint, fibers, and flyings | ||
| Ingress of water | ||
| Dripping and light splashing | ||
| Hosedown and splashing water | ||
| Rain, snow, and sleet *** | ||
| Sleet **** | ||
| Occasional temporary submersion | ||
| Occasional prolonged submersion | ||
| Oil & Corrosion resistance | ||
| Oil and coolant seepage | ||
| Oil or coolant spraying and splashing | ||
| Corrosive agents | ||
When in doubt, purchase a Listed enclosure Enclosure manufacturers are responding to the requirement for Listed enclosures as many local, regulatory codes, continue to increase the types of enclosures being installed in certain applications, especially those that house police and firefighter radio equipment. It can be extremely frustrating and costly for the consumer to purchase an enclosure marketed as “NEMA Type 4”, only to find out that it will not pass an inspection after integration, install, permits etc., have been completed and obtained, because it is lacking the necessary marking. Costs for enclosure returns, reintegration, deadlines missed, can far outweigh the extra cost for the initial purchase of a listed enclosure.