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ID:37862458
大小:176.00 KB
页数:9页
时间:2019-06-01
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1、NEMAEnclosureTypesNEMAEnclosureTypesThepurposeofthisdocumentistoprovidegeneralinformationonthedefinitionsofNEMAEnclosureTypestoarchitects,engineers,installers,inspectorsandotherinterestedparties.[Formoredetailedandcompleteinformation,NEMAStandardsPublication250-2003,“Enc
2、losuresforElectricalEquipment(1000VoltsMaximum)”shouldbeconsulted.ThisStandardsPublicationaswellasallotherNEMApublicationsareavailablefromIHS@800854-7179orhttp://www.global.ihs.com]Definitions[fromNEMA250-2003]InNon-HazardousLocations,thespecificenclosureTypes,theirappli
3、cations,andtheenvironmentalconditionstheyaredesignedtoprotectagainst,whencompletelyandproperlyinstalled,areasfollows:Type1Enclosuresconstructedforindoorusetoprovideadegreeofprotectiontopersonnelagainstaccesstohazardouspartsandtoprovideadegreeofprotectionoftheequipmentins
4、idetheenclosureagainstingressofsolidforeignobjects(fallingdirt).Type2Enclosuresconstructedforindoorusetoprovideadegreeofprotectiontopersonnelagainstaccesstohazardousparts;toprovideadegreeofprotectionoftheequipmentinsidetheenclosureagainstingressofsolidforeignobjects(fall
5、ingdirt);andtoprovideadegreeofprotectionwithrespecttoharmfuleffectsontheequipmentduetotheingressofwater(drippingandlightsplashing).Type3Enclosuresconstructedforeitherindoororoutdoorusetoprovideadegreeofprotectiontopersonnelagainstaccesstohazardousparts;toprovideadegreeof
6、protectionoftheequipmentinsidetheenclosureagainstingressofsolidforeignobjects(fallingdirtandwindblowndust);toprovideadegreeofprotectionwithrespecttoharmfuleffectsontheequipmentduetotheingressofwater(rain,sleet,snow);andthatwillbeundamagedbytheexternalformationoficeonthee
7、nclosure.Type3REnclosuresconstructedforeitherindoororoutdoorusetoprovideadegreeofprotectiontopersonnelagainstaccesstohazardousparts;toprovideadegreeofprotectionoftheequipmentinsidetheenclosureagainstingressofsolidforeignobjects(fallingdirt);toprovideadegreeofprotectionwi
8、threspecttoharmfuleffectsontheequipmentduetotheingressofwater(rain,sleet,snow);andthatwillbeundamagedby
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