Cold Weather Catalog - Chromalox Precision Heat and Control
Cold Weather Catalog - Chromalox Precision Heat and Control
Cold Weather Catalog - Chromalox Precision Heat and Control
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TechnicalTechnical InformationNEMA Enclosures & <strong>Chromalox</strong> EquivalentsNEMA Enclosures forNon-Hazardous AreasThe National Electrical Manufacturer’s Association(NEMA) publishes a classifi cationsystem for electrical enclosures. The NEMAclassifi cation or type indicates the exposureor environment for which the enclosure wasdesigned. While <strong>Chromalox</strong> E1, E2, E3 <strong>and</strong>E4 enclosures are designed for applicationssimilar to the NEMA types, they are not identicaldue to modifi cations required to adapt thehousings to heater confi gurations. Condenseddescriptions of the NEMA non- hazardousenclosure types are listed below with the <strong>Chromalox</strong>equivalents indicated. The condenseddescriptions are not intended to be completerepresentations of the National ElectricalManufacturers Association st<strong>and</strong>ards forelectrical enclosures. For complete details onNEMA enclosure requirements refer to NEMAStd. No. 250.Type 1 Enclosures — are for indoor use inlocations where unusual service conditionsdo not exist. Intended primarily to provideprotection against contact with the enclosedequipment <strong>and</strong> limited amounts of falling dirt.(<strong>Chromalox</strong> E1 or General Purpose enclosures.)Type 2 Enclosures — are for indoor useproviding protection against limited amountsof falling water <strong>and</strong> dirt.Type 3 Enclosures — are for outdoor useproviding protection against windblown dust,rain, <strong>and</strong> sleet <strong>and</strong> damage from external iceformation on the enclosure.Type 3R Enclosures — are similar to Type 3except Type 3R provides protection againstfalling rain.Type 3S Enclosures — are for outdoor useprotecting against windblown dust, rain, <strong>and</strong>sleet <strong>and</strong> providing for operation of externalmechanisms when ice laden.Type 4 Enclosures — are for indoor oroutdoor use providing protection againstwindblown dust <strong>and</strong> rain, splashing water,<strong>and</strong> hose-directed water <strong>and</strong> remain undamagedby the formation of ice on the enclosure.(<strong>Chromalox</strong> E4 Moisture Resistant or E2Moisture <strong>and</strong> Explosion Resistant enclosures.)Type 4X Enclosures — are similar to Type 4except Type 4X also protects againstcorrosion.Type 5 Enclosures — are for indoor use <strong>and</strong>protects against dust <strong>and</strong> falling dirt.Type 6 Enclosures — are for indoor oroutdoor use providing protection against theentry of water during temporary submersionat a limited depth <strong>and</strong> remain undamaged byice on the enclosure.Comparison of Specific Applications of Enclosures for Non-Hazardous LocationsType 6P Enclosures — aresimilar to Type 6 except Type 6Pprotects against the entry ofwater during prolonged submersionat a limited depth.Type 12 Enclosures — are intendedfor indoor useproviding protection againstdust, falling dirt <strong>and</strong> drippingnon-corrosive liquids.(<strong>Chromalox</strong> E2 <strong>and</strong> E4enclosures.)Type 12K Enclosures (knockouts)— are similar to Type 12 exceptthey are provided with knockouts.Knockouts only permitted in eitheror both the top or bottom walls.Type 13 Enclosures — are forindoor use providing protectionagainst lint, dust, spraying of water,oil <strong>and</strong> non-corrosive coolant.(<strong>Chromalox</strong> E2 enclosures maybe used.)The table below lists a comparisonof the characteristics of NEMA <strong>and</strong><strong>Chromalox</strong> enclosures for Non-Hazardous areas.Note — For Classifi ed (Hazardous)Location enclosures, refer toNEMA Enclosures <strong>and</strong> HazardousLocation <strong>Heat</strong>ers elsewhere in thissection.Provides a Degree of Protection AgainstType of Enclosure <strong>Chromalox</strong> ®the following Environmental Conditions 1 2 3 3R 3S 4 4X 5 6 6P 11 12 12K 13 E1 E2 E3 E4Incidental contact with the enclosed equipment X X X X X X X X X X X X X X X X X XFalling dirt X X X X X X X X X X X X X X XFalling liquids <strong>and</strong> light splashing X X X X X X X X X X X XDust, lint, fi bers <strong>and</strong> fl yings — Not Class III X X X X X X X X X X XHosedown <strong>and</strong> splashing water X X X X X XOil <strong>and</strong> coolant seepage X X X X X XOil or coolant spraying <strong>and</strong> splashing X XWindblown dust X X X X X X X X XRain, snow <strong>and</strong> sleet X X X X X X X XSleetXCorrosive agents X X XOccasional temporary submersion X XOccasional prolonged submersionX212