hazardous area location guide - iec nec cec & atex by emerson industrial
TRANSCRIPT
IEC, NEC, CEC, ATEX HAzArdous LoCATIoN GuIdE
EGs Electrical Group9377 W. Higgins RoadRosemont, IL 60018
1.800.621.1506www.egseg.com
Canada
888.765.2226
Mexico
52.55.5809.5070
Asia/Pacific
65.6891.7600
China
86.21.5426.0668
Middle East
971.4.8838.831
Europe
33.1.4817.8502
South AmericaNutsteel Indústria Metalúrgica Ltda.
São Paulo/SP – Brazil
55.11.2122.5777
Macaé/RJ – Brazil
55.22.2770.4686
Camaçari/BA – Brazil
55.71.3623.2028
CHART 14 — IEC PRoTECTIon TECHnIquEs foR HAzARdous AREAs
fLAMEPRoof “d”
• ZONE1• Containinternalexplosion• Controlexternaltemperatureofenclosure• SimilartoNEC®explosionproof• Usuallycastenclosure• Typicaluseinlightingandmotorstarters
REQUIREMENTS:• Internalexplosioncannotbetransmittedoutsideenclosure• Externaltemperatureofenclosurebelowignitiontemperatureofsurroundinggases• Cablefittingsmusthave5threadsengaged• Internalandexternalgroundscrew
InCREAsEd sAfETy “e”
• ZONE1• Highimpactresistantenclosures—FRP,GRP,sheetsteel/aluminum,stainlesssteel• Enclosurewillnotholdstaticcharge• MaintainminimumofIP54ingressprotection• Apparatusnonarcing/sparking• Typicaluseinterminalenclosures
REQUIREMENTS:• UseIECapprovednon-looseningscrewtypeinIECapprovedenclosures• Controlinternalandexternaltemperature
fLAMEPRoof PLus InCREAsEd sAfETy “de”
“d”
“e”
• ZONE1• Locationofarcinghas“d”protection(flameproof)• Connectionterminalshave“e”protection(increasedsafety)• Typicaluseinswitches,lighting,controls,plugsandreceptacles/sockets
Items such as power outlets, switches, some lighting, etc., cannot be protected by “e” mode only. In this case “d” and “e” are combined. REQUIREMENTS:• Areawherearccanbeproducedis“d”orflameproofinarestrictedvolumeenclosure-oftencontactblocksandswitches• Areawithconnectionterminalsis“e”orincreasedsafety• Controlsinternalandexternaltemperatures
InTRInsIC sAfETy “ia” - “ib” - “ic”
• iaZONE0• ibZONE1• icZONE2• Incapableofreleasingenoughenergytocauseanexplosion• Typicaluseincommunicationequipment
REQUIREMENTS:•Installinsafeareas(nonIS),orinanapproved“d”enclosure•Energylimitingbarriers•Transmitssignalfromhazardousarea(IS)•Preventsenergyrelease•EnsureisolationofcircuitsbetweenISandnonISareas
EnCAPsuLATIon “m”
• ZONE1• Epoxyorotherresintototallysealarcingandsparkingdevices• Typicaluseinlightingcontrolsandsealedswitches
REQUIREMENTS:• Arcingandsparkingdevicestotallyimmersedbyepoxyorotherresin• IECapprovednon-looseningconnectors• Controlsinternalandexternaltemperatures
non-sPARKInG “n”
• ZONE2• Enclosurerestrictsingressofhazardousgases• nA=nonsparkingconstruction• nR=restrictedbreathing• nC=hermeticallysealed,nonincendive• Typicaluseinlightingfixtures
REQUIREMENTS:• Equipmenthasnonormallyarcingparts• Thermaleffectsincapableofignition• nA=nonsparking• nR=restrictedbreathing• nC=hermeticallysealednonincendive
oIL IMMERsIon “o”
• ZONE1• Oiltotallysealsarcingandsparkingdevices• Typicaluseinhazardousratedtransformersandswitches
REQUIREMENTS:• Arcingandsparkingdevicestotallyimmersedbyoil• IECapprovednon-looseningconnectors• Controlsinternalandexternaltemperatures
PREssuRIzEd APPARATus “p”
• ZONE1• Expelsignitablevapor/gas• Maintainspositiveenclosurepressure
REQUIREMENTS:•Installinsafeareas(nonIS),orinanapproved“d”enclosure•Energylimitingbarriers•Transmitssignalfromhazardousarea(IS)•Preventsenergyrelease•EnsureisolationofcircuitsbetweenISandnonISareas
PoWdER fILLInG “q”
• ZONE1• Finelygroundpowdertototallysealarcingandsparkingdevices• Typicaluseinlighting,controlsandsealedswitches
REQUIREMENTS:• Arcingandsparkingdevicestotallyimmersedbyfinelygroundpowder• IECapprovednon-looseningconnectors• Controlsinternalandexternaltemperatures
CHART 15 — IEC PRoTECTIon TECHnIquEs foR AREAs WITH CoMbusTIbLE dusT
InTRInsIC sAfETy “id”
• iaDforuseinZONE20,21,22• iaDforuseinZONE21,22• (ExibD)associatedelectricalapparatus-installationinthesafeareas• Incapableofreleasingenoughenergytocauseanexplosion• Typicaluseincommunicationequipment
REQUIREMENTS:•Installinsafeareas(nonIS),orinanapproved“d”enclosure•Energylimitingbarriers•Transmitssignalfromhazardousarea(IS)•Preventsenergyrelease•EnsureisolationofcircuitsbetweenISandnonISareas
EnCAPsuLATIon “md”
• maDforuseinZONE20,21,22• mbDforuseinZONE21,22• Epoxyorotherresintototallysealarcingandsparkingdevices• Typicaluseinlighting,controlsandsealedswitches
REQUIREMENTS:• Arcingandsparkingdevicestotallyimmersedbyepoxyorotherresin• IECapprovednon-looseningconnectors• Controlsinternalandexternaltemperatures
PREssuRIzATIon “pd”
• ZONE21,22• Expelsignitablevapor/gas• Maintainspositiveenclosurepressure
REQUIREMENTS:•Installinsafeareas(nonIS),orinanapproved“d”enclosure•Energylimitingbarriers•Transmitssignalfromhazardousarea(IS)•Preventsenergyrelease•EnsureisolationofcircuitsbetweenISandnonISareas
PROTECTIONBYENCLOSURES“tD”
• tDA21ProcedureAforZONE21• tDB21ProcedureBforZONE21• Highimpactresistantenclosures—FRP,GRP,sheetsteel/aluminum,stainlesssteel• Enclosurewillnotholdstaticcharge• MaintainminimumofIP54ingressprotection• Apparatusnonarcing/sparking• Typicaluseinterminalenclosures
REQUIREMENTS:• UseIECapprovednon-looseningtypeenclosures• Controlinternalandexternaltemperature
CHART 1 — WHAT Is An IEC zonE?
The IEC has defined 3 areas of hazardous gas or vapor release as follows:
ZONE0 zonE 1 ZONE2
ExplosiveAtmosphereIsContinuouslyPresent ExplosiveAtmosphereIsOftenPresent ExplosiveAtmosphereMayAccidentallyBePresent
>1000hours/year 10-1000hours/year 0.1-10hours/year
Zoneinwhichanexplosivemixtureofgas,vaporormistiscontinuouslypresent.
Zoneinwhichanexplosivemixtureofgas,vaporormistislikelytooccurduringnormaloperation.
Zoneinwhichanexplosivemixtureisnotlikelytooccurinnormaloperation,andifitoccurswillonlyexistforashorttime(leaksormaintenance).
The IEC has defined 3 areas of hazardous/combustable dusts as follows:
ZONE20 ZONE21 ZONE22
ExplosiveAtmosphereIsContinuouslyPresent ExplosiveAtmosphereIsOftenPresent ExplosiveAtmosphereMayAccidentallyBePresent
>1000hours/year 10-1000hours/year 0.1-10hours/year
Zoneinwhichanexplosivemixtureofdustiscontinuouslypresent.
Zoneinwhichanexplosivemixtureofdustislikelytooccurduringnormaloperation.
Zoneinwhichanexplosivemixtureofdustisnotlikelytooccurinnormaloperation,andifitoccurswillonlyexistforashorttime(leaksormaintenance).
CHART12—undERsTAndInG THE InGREss PRoTECTIon sysTEM
IPTheIECIPclassificationsystemdesignatesthedegreeofprotectionprovidedbyanenclosureagainstimpactand/orwaterordustpenetration(ingress).Ithastwonumbers;first—protectionagainstsolidobjects,secondprotectionagainstliquid.
EXAMPLE:IP54
1sT fIGuRE:protectionagainstsolidbodies 2nd fIGuRE:protectionagainstliquids
IP TEsTs IP TEsTs
0 Noprotection 0 Noprotection
1 Protectedagainstsolidbodieslargerthan50mm(e.g.accidentalcontactwiththehand) 1 Protectedagainstvertically-fallingdropsofwater
(condensation)
2 Protectedagainstsolidbodieslargerthan12.5mm(e.g.fingerofthehand) 2 Protectedagainstdropsofwaterfallingatupto15˚
fromthevertical
3 Protectedagainstsolidbodieslargerthan2.5mm(tools,wires) 3 Protectedagainstdropsofrainwateratupto60˚from
thevertical
4 Protectionagainstsolidbodieslargerthan1mm(finetools,smallwires) 4 Protectedagainstprojectionsofwaterfromall
directions
5 Protectedagainstdust(noharmfuldeposit) 5 Protectedagainstjetsofwaterfromalldirections
6 Completelyprotectedagainstdust 6 Completelyprotectedagainstjetsofwaterofsimilarforcetoheavyseas
7 Protectedagainsttheeffectsoftemporaryimmersion
8 Protectedagainsteffectsofprolongedimmersionunderspecifiedconditions
GLossARy
AEx SymboldesignatesequipmentbuilttoNEC®standardsforuseinNEC®Zonedesignatedareas.SuchproductsarenotsuitableforuseinATEXorIECExapplications.
ATEXATmosphèresEXplosibles–OrganizationsintheEUwhere‘explosionrisk’exists,mustusetheguidelinesforprotectingtheemployeesofthecompanies.ManufacturerswhoapplyitsprovisionsandaffixtheCEmarkingareabletoselltheirequipmentanywhereinEUwithoutanyfurtherrequirementsbeingappliedwithrespecttotheriskscoveredbeingapplied.
CEC CanadianElectricCode.
CENELECEuropeanCommitteeforElectricalStandardization.CENELECdevelopselectrotechnicalstandardsthatareadoptedasEuronormsbytheEUforelectricalandelectronicgoodsandservices.Itiscomprisedofagroupof31Europeancountriesand11affiliatedcountriesthathaveCENELECstandardsbasedontheparallelworkingIEC/CENELEC.
Class I TermusedinNEC®todescribelocationsinwhichflammablegasesorvaporsareormaybepresentintheairinquantitiessufficienttoproduceexplosiveorignitablemixtures.
Class II TermusedinNEC®todescribelocationsthatarehazardousbecauseofthepresenceofcombustibledust.
Class III TermusedinNEC®todescribelocationsthatarehazardousbecauseofthepresenceofeasilyignitablefibersorflyingsbutinwhichsuchfibersorflyingsarenotlikelytobeinsuspensionintheair.
CSA CanadianStandardAssociation-Providerofproducttesting&certificationservicesforUS,Canadaandcountriesworldwide,forelectrical,plumbing,gas&mechanicalproducts.
Division 1 TermusedinNEC®todescribetheconditioninwhichthehazardcanbepresentduringnormalconditions.
Division 2 TermusedinNEC®todescribetheconditioninwhichthehazardispresentonlyunderabnormalconditions.
CHART 13 — APPROxIMATECONvERSIONOfNEMAENCLOSURETYPERATINgSTOIEC60529ENCLOSURECLASSIfICATIONDESIgNATIONS(IP)(Cannot be Used to Convert IEC classification Designations to NEMA Type Ratings or vice versa)
IPfirst Character
NEMAEnclosureTypeIP second Character
1 2 3,3x,3S,3Sx 3R. 3RX 4,4x 5 6 6P 12,12K,13
IP0_ IP_0
IP1_ IP_1
IP2_ IP_2
IP3_ IP_3
IP4_ IP_4
IP5_ IP_5
IP6_ IP_6
IP_7
IP_8
A B A B A B A B A B A B A B A B A B
A=Ashadedblockinthe“A”columnindicatesthattheNEMAEnclosureTypeexceedstherequirementsfortherespectiveIEC60529IPFirstCharacterDesignation.TheIPFirstCharacterDesignationistheprotectionagainstaccesstohazardouspartsandsolidforeignobjects.
B=Ashadedblockinthe“B”columnindicatesthattheNEMAEnclosureTypeexceedstherequirementsfortherespectiveIEC60529IPSecondCharacterDesignation.TheIPSecondCharacterDesignationistheprotectionagainsttheingressofwater.
Example of Table Use:AnIECIP45EnclosureRatingisspecified.WhatNEMATypeEnclosuresmeetandexceedtheIP45rating?
Referencingthefirstcharacter,4,intheIPratingandtherowdesignated“IP4_”intheleftmostcolumninthetable;theblocksinColumn“A”forNEMATypes3,3X,3S,3SX,3R,3RX4,4X,5,6,6P,12,12Kand13areshaded.TheseNEMAratingsmeetandexceedtheIECprotectionrequirementsagainstaccesstohazardouspartsandsolidforeignobjects.
CHART 3 — AREA CLAssIfICATIon—IEC vs nEC®/CEC (CLAss/dIVIsIon/GRouP)
InflammableMaterial IEC/CEnELEC nEC®/CEC
gasesandvapors Protection zone group Sub- division Class Division group
Acetylene dand/ore 1or2 II C I 1or2 A
Hydrogen dand/ore 1or2 II B+H2 I 1or2 B
Propyleneoxide,Ethyloxide,Butadiene dand/ore 1or2 II B I 1or2 B
Cyclopropane,Ethylether,Ethylene dand/ore 1or2 II B I 1or2 C
Acetone,Benzene,Butane,Propane,Hexane,Paintsolvents,Naturalgas dand/ore 1or2 II A I 1or2 D
CHART 8 — sIMPLIfIEd…WHERE To usE
Equipmentlisted/markedfor: Use—asNoted
NEC®ClassI,Div.1 OKforuseinNEC®ClassI,Zone1and2
NEC®ClassI,Div.2 OKforuseinNEC®ClassI,Zone2
NEC®ClassI,Zone1 NOTOKforuseinNEC®ClassI,Div.1
NEC®ClassI,Zone2 OKforuseinNEC®ClassI,Div.2
NEC®AEx OKforNEC®Zone0,1,2asmarked
NEC®AEx NOTsuitableforNEC®ClassI,Div.1
NEC®AEx OKforuseinNEC®ClassI,Div.2
IECZone1 NOTsuitableforanyNEC®area
IECZone2 NOTsuitableforanyNEC®area
IECExorCENELECEEx NOTsuitableforanyNEC®area
CHART 7 — EXAMPLEs of nEC®/CECCLASSI,DIvISION1AND2SITUATIONS
CLASSI,DIvISION1 CLASSI,DIvISION1AND2 non CLAssIfIEd
EXAMPLE 1
CONDITIONS: ClassI,Division1hazardexistsduringnormaloperation
conditions• Openairmixingtank• Productsstoredinworkarea Areaclassifiedbasedonpropertiesofvaporspresent ElectricalequipmentmustuseapprovedDiv.1NEC®
protectiontechniquesandwiringmethods
ExAMPLE2
CONDITIONS: Division2areacanexistwherevaporsarenormallyinclosedsystemorcontainers Division1and2areasseparatedbybarrierorspace
(transitionzone)• Hazardousareasproperlydocumented• Div.2mustuseapprovedNEC®wiringmethodsandproducts StoredproductsoutsideDiv.1workarea Nonhazardousarea
EXAMPLE 3
CONDITIONS: ClosedtankandpipingconfinesDiv.1 YellowareaqualifiesasDiv.2 Storedproductsnotpresent Purged/pressurizedcontrolroomqualifiesas“nonhazardous”issealedofffrom
Div.2area ElectricalequipmentinDiv.2mustuseapprovedDiv.2protectiontechniques
andproducts
CHART 6 — EXAMPLEs of IEC zonE CLAssIfICATIon sITuATIons
ZONE0 zonE 1 ZONE2 non HAzARdous zonE
EXAMPLE 1
CONDITIONS: Allmanualventilation Zone0area Zone1area Nonhazardousarea• Openairmixingtank• Nomechanicalventilation• Productsstoredinworkarea
ExAMPLE2
CONDITIONS: Hoodovertank Zone0area Zone1area Zone2area Nonhazardousarea Mechanicalventilation Storedproductsseparatedfromworkarea
EXAMPLE 3
CONDITIONS: Tankclosed Mechanicalventilation Zone0 Zone2 Nonhazardousarea• Operationscontroloutsidezones
CHART 5 — GRouPs And subGRouPs CLAssIfICATIon — IEC
groups Subgroups TypicalSubstance Application/Definition
GroupI I MethaneElectricalEquipmentforuseinminessusceptibletofiredamp(Not applicable to ATX Series Products)
GroupII
IIA Propane
ElectricalequipmentforuseinplaceswithanexplosivegasatmosphereIIB Ethylene
IIC Hydrogen
GroupIII(new)
IIIA Combustibleflyings
ElectricalequipmentforuseinplaceswithanexplosivedustatmosphereIIIB Non-conductivedust
IIIC Conductivedust
CHART2—CoMPARInG IEC zonEs And nEC®/CEC dIVIsIons
ZONE0/ZONE20 ZONE1/ZONE21 ZONE2/ZONE22
dIVIsIon 1 DIvISION2
CHART 4 — IEC vs nEC®/CEC TEMPERATuRE CLAssIfICATIon CoMPARIson
Max.Surface Temp.(°C) 85 100 120 135 160 165 180 200 215 230 260 280 300 450
IECClassification T6 T5 T4 T3 T2 T1
NorthAmericanClassification T6 T5 T4A T4 T3C T3B T3A T3 T2D T2C T2B T2A T2 T1
CHART9—EquIPMEnT MARKInGs
undERsTAndInG IEC MARKInGs †
Ex de II C T6 Gb ‡
Gaforzone0Gbforzone1Gcforzone2
TemperatureClassT6=Max85˚°CSurfaceTemperatureGasSubdivision
Group-C=Acetelyne
GroupII=SurfaceEquipmentGroupI=Mines
TypeofProtectiond=“flameproof”
TypeofProtectione=“increasedsafety”
ExplosionProtectedMeetsIECStandards
AEx=EquipmentconformstoNEC®
† Alternate marking: Ex deb IIC T6. ‡ This only applies to IEC Standards only. See “Chart 10 — Understanding IEC Equipment Protection Level Requirements” below.
undERsTAndInG nEC®/CEC MARKInGs
ClassI Division1 groupAA=Acetylene
I=GasandVapors1=Hazardnormallypresent B=Hydrogen
II=Dust2=Hazardabnormallypresent C=Ethylene
III=FibersandFlyingsD=GasolineE=ElectricallyConductiveDustF=FuelDustG=GrainDust
undERsTAndInG ATEX MARKInGs (Directive94/9/EC)*
••• II 1 G
CEMarkingSymbol
IDNo.ofNotifiedBodyoftheQASystem
EUExplosiveAtmospheresSymbol
Surface(non-mining)Equipment
EquipmentCategory
TypeofFlammableSubstance
Ex ia IIC T4 Ga
Ex:ConformitytoIECandATEXHazardousareastandards;SuitabilityforuseinIECandATEXhazardouslocations
ProtectionMethod(intrinsicsafety)
GasGroup(acetylene&hydrogen)
TemperatureClass
EquipmentLevelProtection:
Gaforzone0Gbforzone1Gcforzone2
* See “Chart 11 — ATEX Equipment Category” below.
CHART 11 — ATEX EquIPMEnT CATEGoRy
TheATEXdirectiveadds“TheEquipmentCategory”tothemarkingwhichindicatesthelevelofprotectionwhichcorrelatesbacktothemanufacturersqualityassurancerequirementsasshownonthischart.
Equipmentgroup EquipmentCategoryand LevelofProtection
PresenceorDurationof ExplosiveAtmosphere flammableSubstances Correlationwith
HazardousAreas
I-Mines
M1-Veryhighlevelofprotection
ContinuosPresence Methane,CombustibleDustM2-Highlevelofprotection
II-Surface
1-Veryhighlevelofprotection ContinuousPresence
G-Gas,VaporsD-Dust
Zone0(Gasetc.)Zone20(Dust)
2-Highlevelofprotection LikelytoOccur Zone1(Gasetc.)Zone21(Dust)
3-Normallevelofprotection UnlikelytoOccur Zone2(Gasetc.)Zone22(Dust)
GLossARy
Ex DesignationforhazardouslocationequipmentcomplyingtoIECandATEXstandards.
Flameproof AnIECorEuropeantermusing“containment”protection.Similarto,butnotexactlythesameasUS“explosionproof”.
Group
ClassI:TermusedinNEC®todefineacollectionofgaseswithsimilarphysicalpropertiessuchasmaximumexplosionpressure.ClassII:TermusedinNEC®todefineacollectionofhazardousdustswithsimilarphysicalcharacteristicssuchasignitiontemperatureaswellasattributessuchasblanketingeffectonequipment.ClassIII:TherearenoGrouplistings.
Hazardous LocationExistswhenamanufacturing,storageorhandlingprocessprovidesafuel,consistingofaflammablegas,combustibledust,combustibleflyingorfiber,orsomecombinationofthesethreeelements;andtheseflammablecomponentscanbemixedwithenoughoxygenfromtheambientairtoformanexplosiveatmospherebetweentheLowerExplosiveorFlammableLimit(LEL/LFL)andtheUpperExplosiveorFlammableLimit(UEL/UFL).
IEC InternationalElectrotechnicalCommission-InternationalStandardsandconformityassessmentforallelectrical,electronicandrelatedtechnologies.
IECEx InternationalElectrotechnicalCommissionExplosiveAtmospheres-AnIECExSchemeprovidesameansformanufacturersofEXequipmenttoobtainExcertificatesofconformitythatwillbeacceptedatnationallevelinallparticipatingcountries.
NEC® NationalElectricCode-Governstheinstallationofelectricalconductors,equipment,andraceways.
Subdivision Zonesystemgroupingofvariousgas/vaporsroughlyequaltoNEC®“Group”.
UL UnderwritersLaboratories-AUStestingandcertificationorganization.
Zone Definesconditionsunderwhichexplosivegasesarepresentinanarea.Zonesaresimilartodivisions,butaregenerallybasedonlengthoftimehazardousmaterialmaybepresent.
CHART10—UNDERSTANDINgIECEqUIPMENTPROTECTIONLEvELREqUIREMENTS
Protection Afforded
EquipmentProtectionLevel(EPL) group PerformanceofProtection ConditionsofOperation
Veryhigh
Ma GroupIRequirestwoindependentmeansofprotectionor
remainssafewhentwodifferentmalfunctionsoccur
Equipmentusedinexplosiveatmosphere
Ga GroupII UsedinZones0,1and2
Da GroupIII Usedinzones20,21,and22
High
Mb GroupI Goodforuseinnormalandsevereoperatingconditions Equipmentde-energizedinexplosiveatmosphere
Gb GroupII Goodforuseinnormaloperationorwhereequipmentmalfunctionsareconsidered
UsedinZones1and2
Db GroupIII UsedinZones21,and22
EnhancedGc GroupII
GoodfornormaloperationUsedinZones2
Dc GroupIII Usedinzones22