Technical appendix NEMA UL CSA The National Electrical contact with equipment and the UL is a source for product The Canadian Standards Manufacturers Association protection of an enclosure from compliance based in Northbrook, Association is a not-for-profit (NEMA) is a standards external factors. IL, U.S.A. UL has developed membership-based association organization in Washington, D.C., Further information on protection more than 800 safety standards, serving business, industry, USA, which publishes a number categories may be found on the for which it does product testing, government and consumers of technical standards but does Internet at: www.rittal-corp.com. and serves customers in more in Canada and the global not test or certify products itself. than 35 countries around the marketplace. CSA develops The following NEMA classification world, from manufacturers and standards for public health outlines the protection of retailers to consumers and and safety and offers training individuals from unintentional regulating bodies. materials, workshops, and seminars for education in those standards. NEMA, UL and CSA Standards Enclosure rating NEMA UL CSA National Electrical Manufacturers Association Underwriters Laboratories, Inc. Canadian Standards Association (NEMA 250) (UL 50 and 508)* (C22.2 No. 94-M91) Enclosures are intended for indoor use primarily Indoor use primarily to provide protection to provide a degree of against contact with the enclosed General purpose enclosure. Protects against Type 1 protection against the contact with the enclosed equipment and against a limited amount of accidental contact with live parts. equipment. falling dirt. Enclosures are intended for indoor use primarily Indoor use to provide a degree of protection Indoor use to provide a degree of protection to provide a degree of against contact with the enclosed Type 2 against dripping and light splashing of protection against the contact with the enclosed equipment and against a limited amount of noncorrosive liquids, and falling dirt. equipment. falling dirt. Enclosures are intended for outdoor use Outdoor use to provide a degree of Indoor or outdoor use to provide a degree primarily to provide a degree of protection protection against windblown rain; undamaged of protection against rain, snow, and Type 3 against rain, sleet, windblown dust, and by the windblown dust; undamaged by the damage from external ice formation. formation of ice on the enclosure. external formation of ice on the enclosure. Enclosures are intended for outdoor use Outdoor use to provide a degree of Indoor or outdoor use to provide a degree primarily to provide a degree of protection protection against windblown dust and of protection against rain, snow; Type 3R against rain, sleet, and damage from windblown rain; undamaged by the undamaged by the external formation of ice on external ice formation. formation of ice on the enclosure. the enclosure. Indoor or outdoor use to provide a degree Enclosures are intended for indoor and outdoor Indoor or outdoor use to provide a degree of of protection against rain, snow, and use primarily to provide a degree of protection protection against falling rain, splashing water, Type 4 windblown dust, splashing and against rain, sleet, and damage from external and hose-directed water; undamaged by the hose-directed water; undamaged by the ice formation. formation of ice on the enclosure. external formation of ice on the enclosure. Enclosures are intended for indoor and outdoor Indoor or outdoor use to provide a degree Indoor or outdoor use to provide a degree of use primarily to provide a degree of protection of protection against rain, snow, and protection against falling rain, splashing water, against corrosion, windblown dust and rain, windblown dust, splashing and Type 4X and hose-directed water; undamaged by splashing water, hose-directed water; undamaged by the the formation of ice on the enclosure; resists hose-directed water, and damage from external external formation of ice on the enclosure; corrosion. ice formation. resists corrosion. Enclosures are intended for indoor and outdoor Indoor or outdoor use to provide a degree Indoor or outdoor use to provide a degree use primarily to provide a degree of protection of protection against entry of water during of protection against entry of water during against hose-directed water, the entry of water Type 6 temporary submersion at a limited depth; temporary submersion at a limited depth; during occasional temporary submersion at a undamaged by the formation of ice on undamaged by the formation of ice on limited depth, and damage from external ice the enclosure. the enclosure. formation. Indoor use primarily to provide a degree Enclosures are intended for indoor use primarily Indoor use to provide a degree of protection of protection against circulating dust, lint, to provide a degree of protection against against dust, dirt, fiber flyings, dripping water, Type 12 fibers, and flyings; dripping and light splashing circulating dust, falling dirt and and external condensation of of non-corrosive liquids; not provided with non-corrosive liquids. non-corrosive liquids. knockouts. Indoor use primarily to provide a degree of Enclosures are intended for indoor use primarily Indoor use to provide a degree of protection against circulating dust, lint, fibers, to provide a degree of protection against protection against lint, dust, seepage, Type 13 and flyings; seepage and spraying circulating dust, falling dirt and external condensation and spraying of water, of non-corrosive liquids including oils non-corrosive liquids. oil, non-corrosive liquids. and coolants. Reprinted with permission from National Electrical Manufacturers Association, Underwriters Laboratories, Inc., and Canadian Standards Association. * UL shall not be responsible to anyone for the use of or reliance upon a UL Standard material by anyone. UL shall not incur any obligation or liability for damages, including consequential damages, arising out of or in connection with the use, interpretation of, or reliance upon a UL Standard Material. Rittal Catalog 33 841
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