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 ConditionsNEMA 3NEMA 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.

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