Electric Motors For Hazardous Locations
Rotating Electrical MachinesElectric motors forhazardous locationsTechnical section2203E
2203E Issue 1Electric motors for hazardous locationsElectric motors for hazardous locationsBrook CromptonThe motors are operating in hostileBenefits include:Brook Crompton is a leading manufacturerenvironments throughout the world, on higher efficiency – lower running costsof electric motors for the global industrialoffshore oil and gas rigs and production low noise levelsmarket, with motor solutions which benefitplatforms, onshore terminals, oil refineries, ‘Eurovoltage’ – 400 volts 10% 50Hza wide range of customers.chemical works, coal mines and petrol stations, dual frequency – 50Hz and 60Hz details onstock motorssafely and efficiently delivering power withOur products are used in almost everyminimal attention over long periods.industrial activity including water treatment,building services, chemical/petrochemicals,general processing and manufacturingwhere they drive fans, pumps, compressorsand conveyors, amongst other things.known names including Brook Motors,Crompton Parkinson, Electrodrives,Newman, Bull Electric and Hawker Siddeleyaromatics plants in Malaysia and the world’slargest grain terminal in China are just a few ofthe recent projects in which we have beenmain specifiers and contractors – testimonyenough to the expertise and reputation of themotors we manufacture and to the peopleQuality assurancethe world, backed-up by a network ofdistributors, ensuring excellent localsupport wherever needed.high torque with smooth acceleration andlow current ease of maintenance IP55 protection IEC, NEMA and Japanese standards Multi-Mount versatility simple foot to flange conversion up to sixteen cable entry positions large easy access diagonally split terminalwho make it all work.Electric Motors.We have extensive stocks of motors aroundhigh power factors Oil refineries in Abu Dhabi, chemicals andinvolved with the major energy companies,Brook Crompton incorporates many well box clean modern lines full two year guaranteeStringent quality procedures are observedfrom first design to finished product inaccordance with the ISO9001 documentedquality systems.EfficiencyBrook Crompton are an approvedmanufacturer of ac electric motors within theUK Government’s Enhanced CapitalWe have over 90 years’ technical and designexperience in this most specialised market andare able to ensure the correct selection ofmotors for any application, taking into fullAll of our factories have been assessed tomeet these requirements, a furtherassurance that only the highest possiblestandards of quality are accepted.The W rangeThis catalogue includes the ‘W’ range ofAll motors are of the highest quality, built to themotors, the result of a major developmentlatest national and International standards andprogramme which involved a fundamentalcertified by the relevant national authorities forredesign. The principal design objective wasuse in almost every country.low lifetime cost. This is achieved by highefficiency for reduced energy consumption,ease of installation and low maintenancerequirements.2single and multi-speed motors are includedon the UK Energy Technology List. Pleasecheck the ECA scheme website:www.eca.gov.uk at time of purchase foraccount the two most important factors to beconsidered – safety and economy.Allowance scheme (ECA). A wide range ofcurrent listing.
2203E Issue 1Electric motors for hazardous locationsSpecial projects divisionThe special projects division provides a fullyOil & Gascomprehensive service at all stages ofservice we offer.ContractorJGCKvaerner Oil & GasLG/Lurgi ConsortiumSnamprogettiSnamprogettiSNC LavalinKvaerner Oil & GasTerra Nova AllianceChiyoda/Foster WheelerJGC/Kellogg JVBrown & RootDaelim EngineeringBrown & RootAMECAMECEngineers IndiaBrown & RootBrown & Root/Aker EngineeringR M ParsonsAMECTechnip luor DanielOur reputation has been built on theChemicals and petrochemicalsturnkey development. Our experience inspecial engineering projects extendsthroughout the world and embraces naturalresource exploration, refining, powergeneration, raw material manufacture, foodprocessing and transport engineering.Our team of project co-ordinators have indepth knowledge and experience ofhandling this type of work. Informed andtechnical advice is available from initialexploratory enquiries and carefully followedthrough to completion of contract. Liaisonwith main and sub-contracting companies,investigating special technical andcommercial requirements, submission ofproposals and, of course, competitiveestimates are all part of the very specialexperience and customer satisfaction gainedthrough involvement with a number of mostimpressive international and UK-basedprojects. This includes many different plantapplications for some of the world’s leadingindustrial companies. Recent examples ofour success in this field are listed opposite:Toyo EngineeringToyo EngineeringSnamprogettiFoster WheelerBechtelSnamprogettiJGCKvaernerJacobs EngineeringJacobs Lend LeaseABB Lummus GlobalKvaerner EngineeringABB Lummus GlobalKvaerner ProcessFoster WheelerJacobs EngineeringPlant/locationHawaya Natural Gas - Saudi ArabiaCaptain Field Development - North SeaNODCO Expansion Project - QatarRuwais Refinery Expansion - Abu DhabiASAB Gas Development - Abu DhabiVolgograd Refinery Modification - RussiaAbbot Field - North SeaFPSO - Offshore CanadaLNG Project - OmanLNG Plant - QatarETAP Project - North SeaCompressor Station - IranAlba Field - North SeaCurlew Field - North SeaBritannia Field - North SeaBombay High Platform - IndiaLiverpool Bay Development - Irish SeaUla Field - Norwegian North SeaKalundborg Condensate - DenmarkBonga Field - NigeriaHaradh Gas - Saudi ArabiaBerri Gas - Saudi ArabiaBhit Field - PakistanKarachaganak - KazakhstanTengiz - merada HessPetro-CanadaOman LNGRas Laffan LNG CoBPNational Iranian GasChevronShellConocoONGCBHP PetroleumPhillipsStatoilShell NigeriaSaudi AramcoSaudi AramcoLasmo OilBG/Agip/LukoilTengizchevroilKerteh - MalaysiaKerteh - MalaysiaFertiliser Plant - VenezuelaPTA Plant - PakistanPTA Plant - Saudi ArabiaAlpha-Alcohols Plant - ChinaSriracha Base Oil - ThailandPTA Plant - IndonesiaPharmaceuticals - IrelandPharmaceuticals - SingaporeMoerdijk - NetherlandsSeal Sands - UKSeraya - SingaporeSwords Laboratories - IrelandPharmaceuticals - SingaporeAvon - BristolAromatics MalaysiaVinyl Chloride (Malaysia)Pequiven-KochDuPontArabian Industrial FibresJilin Chemical IndThai Lube Base CoPetrokemaWyeth-AyerstPfizer/Parke DavisShell Chemie BVIneos AcrylicsSeraya ChemicalsBristol Myers SquibbSchering PloughAstra ZenecaGrain Terminal - ChinaOffshore Patrol Vessels - UKAurora Cruise Liner - GermanyGold Mine - KyrgystanMafraq Water Treatment - UAEJubilee Line - UKCaracas Metro - VenezuelaPaper Mill - UKCement Plant - QatarKwang Yang Steel Works - KoreaSludge Drying Plant - ScotlandNagasaki Shipyard - JapanPuma & Lynx Engine Plants - UKEngine Plants - UK & GermanyDalian Xizui Grain TerminalRoyal Brunei NavyP & O Cruise LinersKumtor GoldGovernmentLondon UndergroundC A Metro de CaracasBridgewater PaperQNCCPohang Iron & SteelScottish WaterP & O Cruise LinersFord Motor CoGeneral MotorsLing Ao Power Station - ChinaPower Station - TaiwanSual Power Station - PhilippinesSeraya Power Station - SingaporeTamnin - MexicoKangol - TurkeyCan - TurkeyManjung - MalaysiaLing Ao Nuclear PowerHo-Ping PowerPangasinan Electrical CoPublic Utilities BoardTEGTEKTurkish ElectricityTNB JanamanjngGeneralASC Materials HandlingYarrow ShipbuildersMeyer WerftKilborn - ENKABi-waterDrake & SkullMetro de Caracas (In house)Fluor DanielFives-Cail BabcockDavy McKeeAndritz AGMHIFord (In house)GE SuppliesPowerGEC Alstom PPAlstom Power PlantsGEC Alstom PPIHIAlstom AutomationMitsubishi Heavy IndAlstom PowerAlstom Energy3
2203E Issue 1Electric motors for hazardous locationsATEX Directive 94/9/ECGeneralNotified BodiesDocumentationA potentially explosive atmosphere is oneThese were previously referred to as TestingSpecific installation and maintenancewhich could become explosive under certainAuthorities. European Notified Body providesinstructions are a mandatory part ofconditions (the danger is a potential one).Brook Crompton’s ATEX approval andobtaining approval and must be supplied forcertification to the appropriate standard. ThisATEX equipment.An explosive atmosphere is one where aincludes category 2 and 3 equipment evenmixture with air, under atmosphericthough the latter could be self certified.form of gas, vapour, mist or dusts exist inStandardscountry had its own national standards. Thesuch proportions that they can be ignited byStandards must be current. This may mean,EU member countries now have a commonexcessive temperature, arcs or sparks (theas with dust, entirely new standards. In thestandard for flameproof motors: EN 50 014danger is a real one).case of others, eg EEx d motors, theand EN 50 018. The standard can be certifiedstandards have remained the same inby any of the notified bodies (certifyingSafetysubstance – the latest editions contain onlyauthorities) of the member countries. TheseSafety is of paramount importance in thesmall detail changes.motors are therefore acceptable in all EUcountries and most other Europeanuse of electrical equipment in flammable orpotentially flammable atmospheres. CorrectZonescountries. Countries outside Europe whichselection of motors for hazardousEquipment categoriesoften base their standards on Britishatmospheres is therefore essential, bearingEquipment categories are another changeStandards are expected to follow in duein mind the economics of the various typeswhich has been introduced. Equipment willcourse.of motor available.now have a category number appropriate toThe notes which follow are taken mainlythe Zone for which it is intended to operateMotors thus certified are prefixed EEx –(see table on page 5).eg flameproof motors, EEx d.from the CENELEC/EURONORM standardsEN 50 014 and EN 50 018. Reference isZones remain the same as previously for gasmade to other standards where applicable.but in the case of dust, a new system usingZones 20, 21 and 22, has been introduced.ATEXATEX (ATmosphères EXplosible) is theEuropean Directive 94/9/EC. It applies to allequipment either electrical or mechanicalCertificationused in hazardous atmospheres both dustCertification by a Notified Body is onlyand gas. The directive was introduced inmandatory for equipment categories 1 and1994 and allowed a ten year period for2. For category 3 equipment manufacturersintroduction. All equipment manufacturedare allowed to issue their own certificate ofafter 30 June 2003 must comply with ATEX.compliance. Our motors for category 3however will have a type examinationThe main purpose is to remove barriers tocertificate issued by EECS/BASEEFA.trade throughout the European Community.It also lays down specific requirements forConformity assessmentusers of such equipment.A process identical with the currentcertification procedure. In addition QualityThe essential elements of ATEX involve:-Assessment (or Verification module) isNotified Bodies, Standards, Conformitycarried out by a Notified Body - in our caseAssessment, Marking and Documentation.EECS/BASEEFA.The ATEX Directive is complementary toMarkingother directives such as MachineryThis is the area of greatest visible changeDirective, Low Voltage Directive andand is detailed on opposite page. Motors forElectromagnetic Compatibility. To showgas hazards will contain the familiar markingcompliance with any of these directives,(EEx de IIC T4 for example) preceded by aequipment is CE-marked accordingly. It isstring of symbols (see opposite page).further complemented by the ‘USE’Directive (1999/92/EC) which sets down therequirements for the safety and healthprotection of workers potentially at risk fromexplosive atmospheres.4CENELEC/Euronorm standardsBefore the existence of these standards, eachconditions of flammable substances in the
2203E Issue 1Electric motors for hazardous locationsHazardous atmosphere motor markingABBVCE M A R K I N GEuropean DirectivesLow Voltage DirectiveLVDRef NosItems covered73/23/EECElectrical equipment93/68/EECRange 50 - 1000 volts, ac89/336/EECElectromagneticEMCCompatibilityEN 60034-192/31/EEC93/68/EEC89/392/EECMachinery DirectiveMD91/368/EECNot applicable to electric motors as93/44/EECthey are ‘components’93/68/EECHazardous atmosphere Equipment ATEX DirectiveATEX94/9/ECmandatory after 30/6/2003Compliant with European DirectivesEquipment groupEC Markfor electrical equipment inhazardous atmospheresGroupApplicationIMiningTemperature classMaximum surfacetemperatureT1450 CT2300 CT3200 CT4135 CT5100 CT685 CNon-miningIINotified body (test house),E - European certificationidentification number(0600 EECS/BASEEFA)Ex - Explosion protectionII 2 G EEx de IIC T40600Note re numeralsG Gas OR D DustNumeralsArabicRomanCategories1, 2, 3-Zones0, 1, 2-EquipmentGroupsNote: EEx d and EEx de - external temperature only,EEx e and EEx nA - internal and externaltemperaturesFlameproof symbold - Flameproof to EN 50018e - Increased safety to EN 50019nA - Non-sparking EN 50021-I, IITypical gasAPropaneBEthyleneCHydrogenNB EEx e and EEx nA are suitable for allgases subject to temperature and otheroperating conditions, this symbol istherefore omittedde - Flameproof with increasedsafety terminals EN 50018 & 19Dust - EN 50281-1-1Equipment categoryGas symbol GZone Criteria Presence of Gas or DustDust symbol DCategory 1Zone 0Category 1Zone 20Category 2Zone 1Category 2Zone 21Present in normal operationCategory 3Zone 2Category 3Zone 22Unlikely but if present, then only for a short timeContinuously or very long periodNote: Category 1, Zone 0 and Zone 20 are not applicable to electric motorsDust are marked differently, eg:0600II 2 D T125 CT125 C certified external surface temperature5
2203E Issue 1Electric motors for hazardous locationsStandards, directives and approval authoritiesEuropean DirectivesFour European directives apply in varying degrees to AC induction motors. Brook Crompton comply in the following manner:-Compliance with European directives applying to AC induction motorsDirectivesReference numbersLow voltage(LV)Machinery(MD)Electromagnetic /EEC93/68/EECYesNoNoYESEN 60034Not applicableEN 60034-1EN 50014EN 50018EN 50019EN 50021EN 50281Declaration of conformityCertificate of incorporationStatement(1)Declaration of conformityYesYesYesYesRelevant electricalStatement(2)ComponentHazardous atmosphereMotor CE markedStandardsDocumentation for customers’ technical fileSafety instructions with every motorCommentequipment operatingequipment - mandatorybetweenafter 30/6/200350 to 1000 volts AC(1)Motors operating from a correctly applied, sinusoidal (AC) supply meet the requirements of the EMC directive and are within the limits specified in standardEN 60034-1(2)When installed in accordance with our customer safety and installation and maintenance instructions, they can be put into service only when the machinery intowhich they are being incorporated, has been declared to be in conformity with the machinery directive in accordance with Article 4(2) and Annex IIB of that Directive(98/37/EEC)StandardsHazardous atmosphere motors are manufactured to the standards of the countries listed below.StandardsNational standardRangeUKStandardBSOutputsBS 5000 part 10,appendix AInternationalNorth AmericanNEMA*BSVDEDINNFIECBS 5000 part 10–DIN 42673, DIN 42677NF C51-110–MG1 part 10PerformanceBS 4999 Part 101 BS 4999 part 101VDE 0530 part 1–NF C51-111IEC 60034-1MG1 part 12DimensionsBS 4999 part 141 as DIN and NF–DIN 42673, DIN 42677NF C51-105, NF C51-120IEC 60072-1MG1 part 4MountingEN 60034-7EN 60034-7–DIN 42950NF C51-117IEC 60034-7MG1 part 4Degrees of IP protection EN 60034-5EN 60034-5–DIN 40050NF C51-115IEC 60034-5MG1-1.26BEEx dEN 50014EN 50014FlameproofEN 50018EN 50018EEx deEN 50014EN 50014Flameproof withEN 50018EN 50018increased safety terminalsEN 50019EN 50019EEx eEN 50014EN 50014Increased safetyEN 50019EN 50019EEx nAEN 50014EN 50014Non-sparkingEN 50021EN 50021EN 50281 - 1-1EN 50281 - 1-1EN 50281 - 1-2EN 50281 - 1-2Dust hazardstandard motor complies6EuropeanVDE 0171––VDE 0171––IEC 60079-0IEC 60079-1–IEC 60079-0IEC 60079-1–IEC 60079-7IEC 60079-0––––––IEC 60079-15––––––IEC 60079-7–optionalMotors complying with IEC 60034-1 also comply with many of the national standards of other European countries, eg CEI 203 (Italy), NBN7 (Belgium), NEN 3173 (Netherlands),SEN 2601 01 (Sweden) *Motors to NEMA standards have CSA approval and generally comply with Canadian (EEMAC) standards.
2203E Issue 1Electric motors for hazardous locationsIEC standard 60079MinesCanadianThis gives practical help in the selection,For mines susceptible to firedamp, flameproofCSA – Canadian Standards Association.installation and maintenance of electricalmotors enclosure Group I designated andMotors with CSA approval to imperial orapparatus for use in potentially explosivemarked MEx are used (formerly FLP).metric dimensions are available. These arecertified for Class 1 Division 1 or Class 1atmospheres. It deals with the installationand maintenance requirements appropriateAustralianDivision II.to one of the types of protection that mayNSW – New South Wales Mines Approval isNB CSA motors are often acceptable in thebe used to achieve electrical safety or withheld and motors to AS 2380.2–1991, andUSA. EMR – Energy, Mines and Resourcesbasic requirements and considerations thatcertificate Ex 230 for non-miningCanada – certified motors are available.are fundamental to the use of electricalapplications.Germanapparatus in potentially explosiveatmospheres. The parts which concernSouth AfricanPTB – Physikalisch-Technische Bundes-anstaltelectric motors are:Certified motors for both industry and minescertify a full range of flameproof (pressure-EN 60079 – 14 – Types d and e.can be supplied.tight) motors to German Standard VDEThe classification of hazardous areas isS. Commissiondetailed in EN 60079.Motors for S Commission (formerRussianDust hazards are detailed in EN 50281-1-1Yugoslavian territories). We can supplyMotors certified by GlavgosenergonadzorEN 50281-1-2EEx de motors with increased safety(State Power Inspectorate Body) for generalterminals fitted with sealing chamber assurface use can be supplied.0171/2-61 can be supplied.Approval Authoritiesrequired by the S Commission.MarineEuropeanEECS/BASEEFA and MECSNorth American standardsThe Brook Crompton Ex range of certifiedApprovals are through the ElectricalHazardous location electrical equipment ismotors can be supplied to the requirementsEquipment Certification Service (EECS) of thedealt with in:of most major Marine specifications. Table 3Health and Safety Laboratory based atUSA:lists the main requirements.NEC articles 500 to 516.Buxton, England or other notified bodies.This service covers approvals byby the National Electrical Code –Canada:EECS/BASEEFA, the Electrical Equipmentby the Canadian Electrical Code –VIKC22.1 – Part 1 – Section 18.Motors built to VIK (Verband der IndustriellenCertification Service/British ApprovalsEnergie- und Kraftwirtschaft e.V.) comply withService for Electrical Equipment inthe requirements of this specification.Flammable Atmospheres which is a notifiedbody for all types of motors for use inhazardous atmospheres in surface industries.MECS, is the Mining Equipment CertificationService for motors in mines.Marine motor specificationsBoth BASEEFA and MECS issue certificatesClassifyingauthorityServiceAmbienttemp CLloyds register ofshipping (LRS)RestrictedUnrestricted404575709090 75kW 100kWDet Norske Vertitas(DNV)RestrictedUnrestricted35*45807010090 65mmshaft dia 100kWGermanischer Lloyd(GL)RestrictedUnrestricted4045807510095 75kW 100kWAmerican bureauof shipping (ABS)EssentialNon-Essential5040708095105–Korean registerof shipping (KRS)EssentialNon-ssential507090All motorsAll motors(1)Chinese ClassificationEssentialsocieties (CCS)Non-essential507090****5040457080759010095 100kW 100kWessential5040708090100All motors 100kW–All motors foressential servicestating that equipment meets therequirements laid down in EURONORMStandards, these supersede the formerlyrecognised ‘Buxton’ certificate.Bureau vertitas(BV)EssentialAuxiliariesRegistro ItalianoNavale (RINA)EssentialNon-EssentialNippon Kaiji Kyokai(NKK)EssentialNon-essential45Permissibletemp rise K Class B Class F75†95†Key special requirementsNormalised Witnessed tests forshaft steelessential service* Refrigerated holds only; † 5 K allowed on non ventilated, totally enclosed motors** Refer to Brook Crompton(1) Discretion of local surveyorOther classifications available on request. Please contact Brook Crompton for details 100kW7
2203E Issue 1Electric motors for hazardous locationsProtection conceptsLicence and markDocumentationEC Type examination Certificate – EEx eThis document is issued by the NotifiedLicence – EEx d, EEx e EEx nA and dustand Dust Category 2Body (Certifying Authority), allowing the useIssued by the certifying authority forSimilar to certificate of conformity, butof the Authority’s distinctive mark. Thea period of three years allowing use of thegiving details of the construction of thelicence is only issued after surveillance hasEECS/BASEEFA Ex mark.motor and the various parts.Certificate of Conformity – EEx dType examination Certificate – EEx nAThese motors comply with the relevantand Dust Category 3CENELEC/EURONORM standard.These motors comply with the ATEXbeen completed at the place ofmanufacture.The licence is issued for a period of threeyears and on-going surveillance andrandom checks can be carried out by theNotified Body.The marks include:Ex – Group IIEquipment for surface industryExissued for BASEEFA by EECSEx – Community MarkThis is issued in conjunctionwith the above to indicate thatmotors comply with theCENELEC/EURONORMstandardExExPTB for surface industryMEx (Previously FLP)MExGroup I equipment for minesDirective.issued for MECS by EECSCSACanadian StandardsAssociationAATrade Agents0600II 2 GTypical ATEX markingPrime certificatesResult from new submissions made forcertification.Supplementary certificatesResult from submissions for variations ofcertified equipment.8
2203E Issue 1Electric motors for hazardous locationsImpact testThe classification of the maximum motorCategory 1- Zone 0 in which an explosive gas-As part of the certification procedures for allsurface temperature is detailed in the tableair mixture is continuously present or presentHazardous Atmosphere Motors, tests arebelow. Motors to EN 50014, EN 50018,for long periods.carried out to ensure that motors willEN 50019 and EN 50021, have a temperatureNB No motors may be used in Zone 0.withstand a specified impact. The test10 C lower than T1 and T2, and 5 C lowerinvolves dropping a test mass with athan T3 and lower temperature classes.hemispherical head of 25mm diameter, andair mixture is likely to occur in normalTemperature classificationoperation.a mass of 1kg, a distance of 0.7 metres ontoall parts of motors. Particular areas forTemperature classMaximum surfacetemperature ( C)T1450gas-air mixture is not likely to occur in normalT2300operation and if it occurs it will exist only for aT3200short time.T4135T5100Category 1 - Zone 20 in which a combustibleT685dust-air mixture is continuously present orattention are fan covers, terminal boxes andcable entries. Minimum clearance of fansand covers must be maintained after thetest and terminal boxes must maintain theIP55 enclosure.Flashpoint vs ignitiontemperatureCategory 2 - Zone 1 in which an explosive gas-Cateogory 3 - Zone 2 in which an explosivepresent for long periods.Auto Ignition Temperature is theAmbient temperaturetemperature at which a gas, vapour or mistThe reference ambient temperature to bewill ignite without the presence of a spark ortaken into consideration in the design ofCategory 2 - Zone 21 in which a combustibleflame. The temperature at which ignitionthese motors is 40 C. Standard certificationdust-air mixture is likely to be present duringoccurs due to a spark or flame is known ascovers ambient temperatures down to minusnormal operation.the Flashpoint – see examples below.20 C.NB No motors may be used in Zone 20Category 3 - Zone 22 in which a combustibleFlashpoint vs ignition temperatureGas/vapour/liquidFlashpointAuto ignitiontemperatureMotors can be offered suitable for ambientdust-air mixture is not likely to occur in normaltemperatures of between -55 C and 80 C. Inoperation, but if present them only for a shortsuch cases the temperature is indicated onperiod of time.the certification plate attached to the motor.-20 C230 CAcetadol66 C245 CAcetone-18 C535 CVery low ambient for EEx dZone 0, 1, 2, 20, 21 or 22 is deemed to be aBenzyl Alcohol100 C435 CEEx d motors have been tested at very lownon-hazardous or safe area.Benzene-17 C560 Cambient temperatures by EECS/BASEEFA.Petrol-45 C220 CThey are available as follows:Paraffin38 C210 CAcetalBy implication, an area that is not classifiedHydrogenEEx e motors are suitable for use inEnclosed groupAmbient temperatureZone 1 hydrogen atmospheres subject to theMotor selection must therefore ensure thatIIA/IIB-55 Cusual conditions appertaining to EEx nAthe maximum surface temperature classIIC-20 Cmotors – S1 duty, T1, T2 or T3 surfacetemperatures, no prolonged run-up timemust not exceed the Auto Ignitioninvolved and control gear to disconnect withinTemperature of the explosive mixture.Groupsthe t E time.Temperature considerationsElectrical apparatus for potentially explosiveThe minimum temperature at which a gas,atmospheres is divided into:EEx nA motors are suitable for use in Zone 2vapour or mist ignites spontaneously, atGroup I:hydrogen atmospheres subject to conditionsatmospheric pressure, is known as the AutoGroup II: All potentially explosiveIgnition Temperature. To avoid the risk ofMines.atmospheres other than mines.appertaining to the use of EEx nA motors, ie asfor EEx e, but special control gear is notmandatory.explosion, the temperature of any part orsurface of the motor exposed to theCategories and zonessurrounding atmosphere must always remainThe degree of danger varies from extreme toEEx de, IIC W range motors and flameproofbelow the Auto Ignition Temperature of therare. Hazardous areas are classified into three(pressure-tight) PTB certified (Ex)d 3n G4mixture.Categories and six Zones as follows:motors are suitable for use in Zone 1 hydrogenatmospheres. These have EEx e increasedsafety terminals with weatherproof IP55terminal boxes.NB the terminal box is not flameproof.9
2203E Issue 1Electric motors for hazardous locationsProtection conceptsSub-division and enclosure group orrequirements for ac motors and should notA gap/flamepath, however, will always existapparatus group: flameproof motorsbe confused with enclosure or apparatusbetween the shaft and the motor interior.For hazardous atmospheres in surfacegroups. These motors therefore are markedSafety is therefore achieved in a flameproofindustry (ie not in coal mines), apparatusWITHOUT a suffix letter after the groupmotor by ensuring that all the gaps/Group II equipment is used. In the case ofsymbol II, to indicate that they are suitable forflamepaths in the motor can never exceedflameproof motors -EEx d and EEx de, whichall gases within themandatory dimensions and that the motor isare designed to contain a gas explosionT class, as follows:-physically capable of withstanding an internalwithin the motor, it is necessary to takeEEx nA II T3 orexplosion without transmitting this to theaccount of the different explosive forces andEEx e II T3external atmosphere.flames which various gases produce.Explosion testsType of protection for Zone 1 areas:Using the maximum experimental safe gap,Flameproof motors are submitted to thee increased safetythe standards-making bodies specify safetesting authority who carry out proving testsThe method of protection by which additionalworking dimensions for particular gasesin an explosion chamber. During these tests,measures are applied to electrical equipmentwhich are sub-divided and grouped into A, Bmotors are filled with a gas/air mixture andso as to give increased security against theor C. These sub-divisions are in ascendingplaced inside a chamber containing a similarpossibility of excessive temperatures andorder of increasing explosive force/energygas/air mixture. The gas inside the motor isof the occurrence of sparks and arcs during thelevels. This means that motors eg Group IIBignited by means of an electrical spark. Aservice life of the apparatus. It applies only toare suitable for IIA also. In North Americannumber of tests are conducted and onlyequipment no parts of which produce sparksstandards, the groups are reversed comparedwhen the authority can witness that aor arcs or exceed the limiting temperature into European standards and this is detailed onsecondary explosion on the outside of thenormal service.page 16.motor will not occur, does the motor pass theexplosion test.These motors are not flameproof and not built towithstand an internal explosion. They areThe table shown on page 12, details gasesand chemical compounds together withType of protection for Zone 1 areas:designed to ensure safety by means of a numbertemperature classification and ignitiond flameproofof special features to ensure freedom from arcs,temperature. This table shows theA type of protection in which the parts whichsparks or dangerous surface temperatures underappropriate sub-division, apparatus orcan ignite an explosive atmosphere areall conditions of operation. They resembleenclosure group for flameproof motors.placed in an enclosure which can withstandstandard motors in appearance, but have specialthe pressure developed during an internalincreased safety terminals within an
Jun 30, 2003 · which could become explosive under certain conditions (the danger is a potential one). . though the latter could be self certified. Standards Standards must be current. This may mean, as with dust, entirely new standards. In the . 73/23/EEC 93/68/EEC 89/336/EEC 92/31/EEC 93/68/EEC 89/392/EEC 91/368/EEC 93/44/EEC 93/68/EEC 94/9/EC Ref Nos
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Low voltage induction motors – IEC and NEMA High voltage induction motors Inverters Eddy current variable speed drives Drip proof motors – LV and HV DC motors Synchronous motors Vertical hollow shaft motors Hazardous area motors High efficiency motors Brake motor
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