GB14711-2006电机安全要求

ICS29.160.01K20NationalStandardofthePeople’sRepublicofChinaGB14711-2006SubstituteforGB14711-1993SafetyRequirementsofSmallandMediumSizeRotatingElectricalMachinesIssuedonAugust25,2006EffectivefromMarch1,2007IssuedbyGeneralAdministrationofQualitySupervision,InspectionandQuarantineoftheP.R.ChinaStandardizationAdministrationofthePeople'sRepublicofChinaContentsForeword…………………………………………………………………………………………………………………..III1Scope…………………………………………………………………………………………………………………….12Normativesourcesofstandards………………………………………………………………………………………….13Technicaltermsandexplanations………………………………………………………………………………………..24Generalrequirements…………………………………………………………………………………………………….25Structure………………………………………………………………………………………………………………….26Symbols…………………………………………………………………………………………………………………..67Tests………………………………………………………………………………………………………………………78Lowvoltage(ratedvoltage≤1,000V)ACmotor(includinguniversalmotor)…………………………………………129Highvoltage(ratedvoltage>1,000V)ACmotor……………………………………………………………………….1310DCmotor………………………………………………………………………………………………………………1311Portableandauxiliarygenerator……………………………………………………………………………………….1412Variable-frequency&adjustable-speedmotor………………………………………………………………………..16ForewordAllthetechnicalcontentofthestandardiscompulsory.ThestandardisconsistentwiththesafetyrequirementsinGB755-2000RotatingMachineRatingandPerformance.ThestandardisasubstituteforGB14711-1993GeneralSafetyRequirementsofSmallandMediumRotatingElectricalMachines,withthepresenttitleSafetyRequirementsofSmallandMediumSizeRotatingElectricalMachines.ThestandarddiffersfromGB14711-1993mainlyinthefollowingrespects:1.Standardwasrearranged;2.Thesafetyrequirementsofportable,auxiliary,andvariable-frequency&adjustable-speedmotorswereincluded;3.Tablesrelatedwereplacedatthebackofthisbook,foreasyreference.ThestandardisproposedbyChinaElectricalEquipmentIndustryAssociation.ThepreparationandmanagementofstandardisunderthesupervisionoftheChinaRotatingElectricalMachineStandardization&TechnologyCommittee(SAC/TC26).ShanghaiElectricalEquipmentResearchInstitutewasresponsibleforthedraftingofthestandard.Otherorganizationsthatparticipatedinthedraftinginclude:BeijingB.J.ElectricMotorCo.,Ltd.,ChongqingSailimengElectricMotorCo.,Ltd.,ShandongQiluElectricMotorManufacturingCo.,Ltd.,LanzhouElectricMotorCo.,Ltd.,ShanghaiUnitedElectricMotor(Group)Corporation,ZhejiangJinlongElectricMotorCo.,Ltd.,ShandongHualiElectricMotorCo.,Ltd.,JiangsuQingjiangElectricMotorCo.,Ltd.,KunmingElectricalEngineeringCo.,Ltd.,andShanxiElectricMotorManufacturingCo.,Ltd.MajordraftersincludeNiLixin,ChenWeihua,JinWeiwei,LiBaojin,LiXiuying,ZhangShengde,LiuJinyan,CaiJiagang,ZhouQi,TianZhigang,GaoWen’an,CuiHuajian,YeJinwu,FengJinquan,ZhouGuobao,ZhangBinandYueWeiping.ThestandardshallreplaceGB14711-1993fromtheeffectivedate.GB14711-1993isthefirstedition.Thisstandardisthefirstamendment.SafetyRequirementsofSmallandMediumSizeRotatingElectricalMachines1Scope1.1Thestandardspecifiesthesafetyrequirementsofsmall/mediumgeneral-purposerotatingelectricalmachines(electricmotorandgenerator,hereinafterreferredtoas“motor”).1.2Thisstandardisnotapplicabletoastronauticmotors,tractionmotors,explosion-proofmotors,hoistandmetallurgicalmotors,shieldmotors.TestsofsmallpowermotorsproducedaccordingtoGB/T5171canalsorefertoGB12350.1.3Incaseothertypesofmotorsinvolvespecialrequirementsthatarenotcoveredinthisstandard,newstandardshouldbedeveloped.2NormativesourcesofstandardsThetermsandconditionsquotedfromthefollowingdocumentsbecamethetermsandconditionsofthisstandard.Wheredocumentsaredated,theirattachedmodificationlist(exclusiveofcorrections)ortherevisededitionisnotapplicabletothisstandard.Nevertheless,theconcernedpartiesareencouragedtoconsiderthelatesteditionsofthosedocumentswhenreachingagreementbasedonthisstandard.Wheredocumentsareundated,theirlatestversionsareapplicabletothisstandard.GB755-2000RotatingelectricalmachinesRatingandperformance(idtIEC60034-1:1996)GB/T825-1988Eyescrew(NEQISO3266:1984)GB1971RotatingelectricalmachinesCableterminalsymbolandsenseofrotation(GB1971-2006,60034-8:2002,IDT)GB/T2423.4-1993ElectricalandelectronicproductsenvironmentaltestsproceduresTestsDb:temperature&humiditytestingmethods(eqvIEC60068-2-30:1980)GB/T4207-2003CTIandPTItestingmethodsforsolidinsulationmaterialunderhumidconditions(IEC60112:1979,IDT)GB4706.1-1998HouseandsimilarpurposeappliancessafetyPartone:generalrequirements(eqvIEC60335-1:1991)GB/T4942.1-2001Rotatingelectricalmachinehousingprotectiongrading(IPcode)(idtIEC60034-5:1991)GB/T5169.11-1997ElectricalandelectronicproductsfirehazardtestsTestingmethodsGlowwiretestandguidelinesforthefinishedproducts(idtIEC60695-2-1/1:1994)GB/T5169.12-1999ElectricalandelectronicproductsfirehazardtestsTestingmethodsGlowwireflammabilitytestformaterials(idtIEC60695-2-1/2:1994)GB/T5465.2-1996Electricalequipmentdiagramsandsymbols(idtIEC60417:1994)GB/T11020-1989Flammabilitytestingmethodsforsolidinsulationmaterialexposedtoignitionsource(eqvIEC60707:1981)GB/T13002Built-inthermalprotectorofrotatingelectricalmachinesRotatingelectricalmachinesprotectionrules(GB/T13002-1991,eqvIEC34-11-1:1978)GB/T16422.2-1999TestingmethodsofexposuretolaboratorylightsourcesforplasticsParttwo:xenon-arclamp(idtISO4892-2:1994)GB/T17948.1-2000RotatingelectricalmachinesinsulationperformanceappraisalRandomwindingstestproceduresThermalappraisalandgrading(idtIEC60034-18-21:1992)GB/T18380.1-2001BurningtestforcablesexposedtoflamesPart1:verticalburningtestofsingleinsulatedwireorcable(idtIEC60332-1:1993)GB/T18380.2-2001BurningtestforcablesexposedtoflamesPart2:verticalburningtestofsingleinsulatedthincopper-corewireorcable(idtIEC60332-2:1989)GB/T18380.3-2001BurningtestforcablesexposedtoflamesPart3:burningtestofbunchedwiresorcables(idtIEC60332-3:1992)JB/T7589-1994High-voltageelectricalmachinesinsulationthermalstabilityappraisalmethods(eqvIEC60034-18-31:1992)JB/T8158-1999Startingperformanceofsingle-speed,three-phase,squirrel-cageinductionmotors(voltage≤690V)(eqvIEC60034-12:1995)JB/T10098-2000Impulse-voltageenduranceofACmotorstatorcoils(idtIEC60034-15:1995)IEC60034-18-22:2000Rotatingelectricalmachineinsulationfunctionappraisal—Formedwindingtestprocedures—InsulationcompositionssubstitutionandchangegradingIEC60034-18-31:1992Rotatingelectricalmachineinsulationfunctionappraisal—Formedwindingtestprocedures—Insulation’sthermalpropertyappraisalandgradingformotors≤50MVAand15kVIEC60034-18-32:1995Rotatingelectricalmachineinsulationfunctionappraisal—Formedwindingtestprocedures—Insulation’selectricpropertyappraisalandgradingformotors≤50MVAand15kV3TechnicaltermsandexplanationsThefollowingtermsandexplanationsareapplicabletothisstandard.3.1ClearanceClearanceistheshortestdistancebetweentwoconductivepartsmeasuredthroughair.3.2CreepagedistanceCreepageistheshortestpathbetweentwoconductivepartsmeasuredalongthesurfaceoftheinsulation.Note:theseambetweentwoinsulatingpartsistakenasapartofthesurface.3.3LeadLeadisawirethatconnectsbetweenwindingcoilsandwiringterminals,orbetweenwindingcoils,orbetweenwindingcoilsandotherconductorsinsidethemotor.Leadscanbedirectedintoajunctionboxoutsidethemotor.3.4SupplycordItistheflexiblecordthatgoesfrominsidethemotortotheoutsideforthepurposeofpowersupply.4Generalrequirements4.1ThemotorscoveredinthisstandardshouldconformtotherequirementsofGB755-2000.4.2Thecapacitorintegratedwiththemotorisregardedaspartofthemotor.4.3Whetheratroomtemperatures,orthermalstate,orhumidconditions,motorsshouldhaveadequateinsulationresistance.Insulationresistanceismeasuredandtestedaccordingtotherequirementsof7.4.4.4Innormaloperation,motorsshouldnothaveelectricalormechanicalfaultsthatwouldaffectsafety;ordamagedinsulation;orlooseconnections;oragedflexiblecomponentsandoutercoverparts.5Structure5.1Generalprinciples5.1.1Theelectricalcomponentsofmotorarespeciallyapprovedmodelsandspecifications.Theyshouldbetestedalongwiththemotor.Allrotatingpartsshouldoperatesafely(includingatover-speed).Componentsthatarenotconnectedtorotatingpartsandwouldnotaffectelectricalormechanicalsafetymaybetakenasaseparatepartofthemotor,andcanbesuppliedseparately.5.1.2Withtheexceptionofwaterproofmotors(e.g.motorsforunderwateruse)andthosefreeofwateraccumulationinside,allmotorsshouldhaveappropriatedewateringmeasurestopreventaccumulatedwaterinside,whichwouldreducetheclearanceandcreepagedistancebetweenwindings/nakedchargedpartsandground.Theairventsonthemotorcanalsoperformdewateringfunctions.Whenarrangingwater-dischargeholes,theirdiametersshouldbenosmallerthan3mmandconformtotherequirementsof7.6.5.1.3Ifmotorisanintegralpartofotherequipment,thefunctionsofmotorbedplateandoutercover(inclusiveofjunctionbox)canbeperformedbytheequipment.5.1.4Astonaturalair-coolingmotor,ifbuilt-inoverheatprotectorisrequired,itshouldconformtoGB/T13002.5.1.5Withtheexceptionofopen-typemotors,itmustbeensuredthatcontactwiththepanelorcoveringofnakedchargedparts(AC>30V,DC>50V)isavoided.Thepanelorcoveringmayonlybeopenedwithtoolorkeys.5.2Outercover5.2.1Thematerialsofanycomponentontheoutercovershouldbeabletoendurehightemperaturesandmechanicalstressthatmayoccurduringnormalworkingconditions,andshouldnotincurfireorelectricshockduetobending,creep,ordeformation.5.2.2OutercoverprotectiongradingshouldconformtoGB/T4942.1-2001.5.3Non-metallicstructures5.3.1Insulationstructuresforsupportingandfixingcurrent-carryingcomponentsshouldhavegoodresistancetoinflammation,heat,electrictracking,moisture,andadequatedielectricstrengthandmechanicalstrength.5.3.2Non-metallicoutercover,windshield,andjunctionboxshouldbeabletoendurehumidity,grease,inflammation,andtemperaturevariation.Theyshouldbeabletowithstandtheimpacttestasin7.8.3,theageingtestasin7.11,theheatdeformationtestasin7.12,andtheburningtestasin7.13.5.3.3Thepatchboardandnon-metallicjunctionboxshouldbeabletoendurethetemperaturesnolowerthanthatspecifiedinTable1.5.4Junctionbox(formotors≤750V)andwiringdevices5.4.1Junctionboxcanbeanindependentcomponentfixedontheexteriorofmotor,orserve,partiallyorwholly,asapartonthemotorhousing.5.4.2Junctionboxshouldhaveappropriatevolumeinordertocontainwiringdevices,meetingtheclearanceandcreepagedistancerequirementsof5.8,andbeabletowithstandtheimpulsevoltagetestasin7.5.2.5.4.3Ifmadefrommetal,thejunctionboxshouldhavethethicknessasspecifiedinTable2,andconformtothetestrequirementsof7.8.4.5.4.4Non-metallicjunctionboxshouldconformto5.3.2.5.4.5Thefixingbetweenjunctionboxandmotorhousingshouldbeseparatefromthefixingbetweenjunctionboxanditscover.5.4.6TheprotectiongradeofjunctionboxonsmallmotorshouldbenolessthanIP44.5.4.7Ifwireconduitisused,itshouldbe:a)NosmallerthanthesizesspecifiedinTable3,inconsistencewiththeratedcurrentmarkedonthemotor;b)Placedinaflat,largeenougharea,tomeettherequirementsofbushingandlocknut,unlesstheopeningonthejunctionboxissuitableforwiretopassthroughandbushingneednotbeusedtoprotectwireinsulation.5.5Conduitbushingandequivalenttappedhole5.5.1StraightpipeorTaperpipethreadsealcanbeusedforthetappedholeofconduit,withthescrewinglengthnosmallerthan3.5pitches.Thenumberofinlettapped-holeshouldbespecifiedinproductstandarddescription.Theinletholesshouldbeequippedwithinsulationconduitandbesealedwithrubberorsimilarmaterialatthefactory.5.5.2Conduitbushingforaseparately-castjunctionboxandtappedholeforfixingrigidmetalconduitshouldhaveenoughmechanicalstrengthandbetestedasper7.8.5.5.6Supplycord5.6.1Ifthemotorisequippedwithsupplycord,orforthepurposeofeasyconnectiontootherequipment,flexiblecablesthatextendoutsidethebedplate(housing)aresuppliedalongwithnecessaryplugs,thecordandplugsshouldconformtoproductstandardorrelevantstandardoftheequipment.5.6.2Unlessgroundingisnotrequired,thereshouldbeoneearthleadamongthecords.Theearthlead(includingtheterminal)shouldbearadifferentcolororsymbolforeasydistinction.5.6.3Thesupplycordshouldhavearatedvoltagenosmallerthanthemotor’smaximumworkingvoltage.Itscurrent-carryingcapacityshouldatleastbeequaltoloadcurrentmultipliedbyusagecoefficientorfullloadratedcurrentmultipliedby125%,whicheveristhegreater.Theinsulationofcordshouldbeabletowithstandthepower-frequencyvoltagetestrelatedtothiscircuit.5.6.4Unlesstherearemeasurestoeliminatethepossibletensileforceorthesupplycordisnotexposed,insulationlayerandclampsshouldbeavailablewherethecordextendsout,inordertopreventexternalforcepassingontothewiresinsideandavoidtwistingordisplacementofcords.5.6.5Unlessthereareotherprotectivemeasures,itmustbeensuredthatcordsdonotwithdrawintothemotor.5.6.6Clamps:cordclampsshouldbemadeofinsulatingmaterial.Ifmetalispresent,thereshouldbeinsulatinglining.5.6.7Cordclampsshouldbeexaminedforreliabilityandbeabletowithstandthetensionandtorsiontestsasin7.9.5.6.8Cordshouldnotbeforcedthroughtheinletopeningsoastodamagetheinsulation.5.6.9Theloosecables/cordsinthejunctionboxthataretobeconnectedonsiteshouldbenoshorterthan150mminfreelength.5.7Leadwire5.7.1LeadwiretypesandsizesLeadwireshouldhaveappropriatecurrent-carryingcapacityandlength.Leadwiresoncoilsorofsimilarpurposeshouldconformtothefollowingrequirements:a)Theleadwireforconnectingtopowersupplyshouldbenosmallerthan0.75mm2incross-sectionalarea;b)Theleadwiresinsidethemotor,suchasthosewhichconnecttointernalcomponentsorpowersupplycordsorpatchboard,canbesmallerthan0.75mm2butshouldbenosmallerthan0.30mm2.5.7.2Leadwireinsulation5.7.2.1Asforwindingsleadorbrushholderlead,whichissoftandcannotbepositionedtoensureproperclearance,insulatedconductorshouldbeusedorthermal-andmoisture-resistantmaterialshouldbeusedtowrapupcontinuouslybetweentwosupportpoints.Thematerialcanbeinsulatingpad,insulatinghoseorotherappropriatemeans.5.7.2.2Themodelsandspecificationsofleadshouldfittheworkingvoltageofmotor.Ifinstantaneoushightensionmayoccuronanycomponentduringnormaloperation,theleadshouldhavegoodinsulatingcapabilitytowardsthehightension.5.7.2.3Leadshouldconformtorelevantstandard,withthermalwithstandinggradenolessthantheinsulationgradeofthemotor.5.7.3Leadprotection5.7.3.1Internallead(wire)shouldbeproperlyfixedwithwindings.Twoormoreleads(wires)ofthesamealignmentshouldbeboundtogether.Itshouldnotbeplacedonthepointedorsharpedgeofpartsandstayawayfrommovableparts.5.7.3.2Theconnectionsofinternalleads(wire)shouldbeinsulatedwithbushingsandtapesandproperlyfixed,topreventaccidentduetoloosebushingorlooseweld.Theconnectionsshouldbeabletowithstandthedielectrictestasspecifiedin7.5.Lead(wire)andwireterminalshouldbejoinedwithcoldweld.5.7.3.3Propermeasuresshouldbeavailabletoensurewireterminalsstayintheiroriginalpositionwhenconnectorbolts/nutscomeloose.Openconnectorandlockwashershouldnotbetheonlymeans.5.7.3.4Whenstranded-lead(wire)isconnectedtoterminal,itshouldstayincertainposition,toavoidgroundingorshortcircuit.5.7.3.5Wheninternallead(wire)goesthroughmotorbedplate,insulatorsorothermeansshouldbeusedtoensureinsulationatthebores.Insulatorsshouldbesmooth,withoutburrsorsharpedge.Leadthatpassesthroughtheexternalcoolingchamberofhermeticmotorshouldbeprotectedwithmetalliccableconduitorsimilarpipes.5.8Clearanceandcreepagedistanceoflowvoltagemotors(forrequirementsonhighvoltagemotors,seeChapter9ofthisstandard)5.8.1TheclearanceandcreepagedistanceasdescribedbelowshouldbenosmallerthanthatspecifiedinTable4.Otherwise,theyshouldconformto5.8.2~5.8.5.a)Alongtheinsulationmaterialsurfaceandthroughtheair;b)Betweennakedchargedpartsofdifferentvoltagesorbetweendifferentpolarity;c)Betweennakedchargedparts(includingelectromagneticwire)andpartsthataregrounded(ormaybegrounded).5.8.2Withtheexceptionoflowvoltagemotors,clearanceandcreepagedistanceshouldconformtorelevantarticlesinthisstandard.5.8.3Asfarasthestationaryparts(e.g.brushholder)ofbrushedmotorsareconcerned,duetocarbonsootaccumulated(eg.ontheinsulationofthebushholder)betweencommutatorandslipring,theclearanceandcreepagedistanceshouldbegreaterthanthatspecifiedinTable4by50%atleast.Otherwise,appropriatespacers,ringsorsimilardevicesshouldbeprovided.5.8.4Therequirementof5.8.3onincreasedclearanceandcreepagedistanceisnotapplicabletomotorswithframesizegreaterthanH90.5.8.5Astotherotorwindingsandcentrifugalswitchesofwound-rotormotors,theclearanceandcreepagedistancemaybesmallerthanthatspecifiedinTable4,butitmustbeensuredthatnobadconsequencewouldoccur.5.8.6Itmustbeensuredthatwireconnectors,includingpressure-typeconnection(quickconnection),donottwistormove,inordertokeepclearanceandcreepagedistancenosmallerthanthatspecifiedin5.8.1.Unlessclearanceandcreepagedistanceremainunchangedwhenconnectorsdeviateinarangeof30º,ortheconnectorscrewsareinsulated,itisnotnecessarytotakeadditionalmeasurestopreventconnectorturning.5.8.7TheclearanceandcreepagedistanceasspecifiedinTable4canbeachievedbyusinginsulatingbarrier,whichshouldbemadefromthefollowingmaterials.a)Ifnakedlivepartsarewithininsulatingbarrierormaycontactwiththebarrier,heat-/moisture-resistantmaterialshouldbeapplied(e.g.,ceramicbottle,phenolicplastic,polyester,polyestercarbonate,nylon,mica)b)Whereitshallnotcontactnakedliveparts(exceptelectromagneticwire),appropriatemoisture-resistantfiberandsimilarmoisture-absorbingpartitionmaybeused,withthicknessnosmallerthan0.66mm.Iftheclearanceandcreepagedistanceexceedthatspecifiedbyhalf,insulatingpartitionnothinnerthan0.33mmshouldbeused.Otherinsulatingmaterialsthinnerthan0.33mm,ifprovensuitablefornormaluseintermsofmechanicalandelectricalproperties,canalsobeused.5.9Components5.9.1Components,suchascapacitor,switch,currenttransformer,voltagetransformer,shouldbefixedfirmlyandeasytoreplace.5.9.2Capacitorshouldbeinstalledinsideprotectivecoverandnotcontactmetallicparts.Ifcapacitorcasingismetallic,additionalinsulationshouldbeusedtopartitionitfrommetallicparts.Capacitororitsadditionalcasingshouldbeabletopreventsplashings,sparksandmeltingthatmayoccurwhencapacitorbreaksdown.5.9.3Steelcoverforcapacitorshouldbenosmallerthan0.5mminthickness.5.9.4Astooil-filledcapacitor(non-electrolyticcapacitor),apressure-sensitivebreakerisbuiltinside,topreventspillageofinflammablesubstancethroughthedamagedcasing.Thereshouldbeextraaxialspacetoallowthemovementofbreakerterminal.Theextendedspaceshouldbe12.7mmatleast,whichisarequirementinadditiontotheclearancerequirementspecifiedinTable4.5.10Protectivegroundingdevices5.10.1Groundingdevicesthatconformto10.1ofGB755-2000shouldbeavailable,unlessgroundingisnotneededonthesite.5.10.2Thereshouldbepermanent,reliableelectricalconnectionbetweenmotorbedplateandgroundingdevices.Whenmotormovesontheequipmentbase,groundingconnectionshouldbestillingoodcondition.5.10.3Ifwireterminalisusedtoconnectgroundwire,theterminalshouldconformtotherelevantrequirementin5.12.5.10.4Groundwireterminalshouldbelockedsafely,topreventaccidentalturningandreducedclearance/creepagedistance.Itcannotbereleasedwithouttheaidoftools.5.10.5Groundwireterminalshouldbeusedfornootherpurpose.5.10.6Thematerialsofgroundingconductor,groundingterminalandjointdeviceshouldbecompatible,withgoodelectric-erosionresistanceandconductibility.Ifferrousmetalisused,theyshouldbeprotectedwithelectroplatingorothermeanstoavoidrusting.5.10.7Groundingconductorshouldhaveenoughtenacity,andbeabletowithstandthestressfrommotorvibration.Appropriatemeasuresshouldbeavailabletoavoidhazardsduringinstallationandoperation.5.10.8Itmustbeensuredthatgroundingconnectionsarecoveredwithnon-conductivecoatingssuchaspaint.Connectionshouldbebymeansofcoldweldorothereffectivemethods,insteadofarticulationorsimplysoldering.5.10.9Thegroundingconductorthatpenetratesrubberbaseshouldbemetallic,insteadofconductiverubber.5.10.10Groundingterminalscrewsandgroundingconductorshouldhaveadequatecross-sectionalarea.Fortheminimumdiameterofgroundingscrew,seeTable5.ThecrosssectionofgroundingconductorshouldconformtoTable17inGB755-2000.5.11Brushholderandterminals5.11.1Thereshouldbegoodelectricalcontactbetweenbrushholderwireandterminals.Clearanceandcreepagedistancebetweenmovableparts/non-currentcarryingmetallicpartsandchargedpartsshouldnotbereducedduringuse.5.11.2Withtheexceptionofelectromagneticwire,nakedchargedpartsshouldbesupportedbyinsulatingmaterialsthatareabletoendureinflammation,heat,moisture,andelectrictracking.5.11.3Theterminalwireatthebrushholdershouldhavestopperdevice.5.12Wireterminal5.12.1Astobolt-typeterminalconnectingtopowersupplycable,thescrew(bolt)andnutshouldconformtorelevantstandardandrequirementsin5.12.3~5.12.4.5.12.2Theterminalofboltconnectorshouldnotbeusedtofixotherparts.Whenconnectingtopowersupplycord,thewireterminalcanbeusedtoclampwiresinsidethemotor,ifsuchactwouldnotcausewirestobecomeloose.5.12.3Thepermissiblecontinuouscurrentatthewireterminalisinrelationtothestructureofterminal,diameterandmaterialofscrews(orbolts),whichshouldconformtoTable6(boltconnector),Table7(chipterminal),andTable8(looselead-outwire)respectively.5.12.4Wireterminalsshouldbeproperlyfixed.Whenclampsonthesupplycablefastenorrelease,wireterminalsshouldnotturnordisplace,lead-outwireshouldbesubjecttostressandclearance/creepagedistanceshouldbenosmallerthanthelimitsspecifiedinTable4orTable13.5.12.5WireconnectorshouldbeequippedwithOT-typepressureweldingterminalorarchedwasher,toensurereliableconnectionbetweenwireandterminal.Whenclampingwires,lockingdeviceshouldbeavailable,toensureappropriatecontactbetweenmetalsurfaces,sothatwireswouldnotbedamagedorslip.5.12.6Terminalofbolt-typepowerconnectionshouldbeequippedwithhardplateconnector,forthepurposeofchangingmotorvoltage,rotationspeedandsenseofrotation.ItshouldbeensuredthattheclearanceinallconnectionsisnosmallerthanthatspecifiedinTable4orTable13.5.12.7Ifconnectorscrewisinstalledonametalpiece,themetalshouldbenothinnerthan1.3mmandshouldhavemorethantwothreads.Astometalthatisun-stretched,ifitissmallerthan1.3mminthicknessbutnosmallerthanthethreadpitch,thetappedholecanbeextrudedtomakethescrewinglengthnosmallerthantwopitches.5.12.8Wireterminalsshouldbejoinedproperlytoensuregoodconductivityandenoughcontactpressure,andexpectedcurrent-carryingcapacity.Allcurrent-carryingcomponentsshouldbemadefrommetalswithgoodconductivityandadequatemechanicalstrength.Iffittingsaremadeofferrousmetal,theyshouldbeelectroplatedorprotectedwithothereffectivemeanstoavoidrusting.5.13BearingstructureItmustbeensuredthatlubricantdonotflowdowntheshaftandentermotorwindings,current-carryingcomponentsorotherequipments.5.14CommutatorandcollectorringMotorswithcommutatorandcollectorringsshouldhavesightwindowthatcanbeeasilyremoved.Brushholdercomponentsshouldbesodesignedthatwhentheywearout,thebrush,springandotherpartswouldnotenergizetheunchargedmetalpartsnearbyorcontactchargedparts.5.15Insulation5.15.1Motorwindingsshouldbeproperlybound,fixedandinsulated.Terminalsofwindings,ifinsulated,shouldnotshownakedcopper.5.15.2Theinsulationofthemotorshouldhavegoodmoisture-endurance,insulatingcapabilityandmechanicalproperty.Itshouldbeabletowithstandthetestasin7.10.5.15.3Thecompositionofinsulation,suchaselectromagneticwire,slotinsulation,bindingtape,slotwedge,impregnatingvarnish,supplycable,shouldbewellcompatibleandpasstestandproveappropriate.Insulationappraisaltestshouldconformto7.10.5.16Joints5.16.1Thejointsforelectricalormechanicalconnectioninthemotorshouldbeabletoendurethemechanicalstressthatoccursduringnormaloperation.Screws(bolts)andnutsonthejointsshouldnotmadefromsoftmetals(suchaszinc,aluminumandetc.)ormetalsthatareliabletocreep.5.16.2Jointscrewsshouldhavecertainlengthstoensurereliableconnection.5.16.3Ifscrewsserveforthepurposeofbothmechanicalandelectricalconnection,theyshouldbelockedsafelytoavoidaccidentduetoloosening,heatingandincreasedcontactvoltage.5.16.4Rivetsforelectricalconnection,ifsubjecttotorsionduringnormaluse,shouldbelockedtoavoidturning.Goodlockingdevicesincludespringwasher(orsimilarthings),non-circularshankrivet,andotherappropriatemethods.5.16.5Jointsshouldbecheckedagainsttheaboverequirementsbyvisualinspectionandhand.6Symbols6.1EachmotorshouldhavenameplateaccordingtoChapter9ofGB755-2000.6.2Astosingle-directionmotors,thereshouldbeanarrowtomarkthesenseofrotation.6.3Ifthemotorisequippedwithpowerneutralline,itshouldbemarkedwith“N”.6.4Thegroundingsymbol“”shouldbeshownneartheearthingterminal.Ifnecessary,theacronym“PE”shouldbeshownmeanwhile.Thesesymbolsshouldnotbeplacedonscrews,removablewashersorwireconnectingcomponentsthatmightbetakendown.6.5Astosmallmotors,thegroundingcordshouldbecoloredwithgreenandyellow.Othercordsshouldnotbecoloredassuch.6.6Symbolsforwireterminals,senseofrotation,andtheirrelationsshouldconformtoGB1971.6.7Ifcapacitorisnotsuppliedwiththemotor,specificationsofcapacitorshouldbeprovided(e.g.,model,capacitance,ratedvoltage).6.8Astoseriesmotorandcompoundmotorthathasspeedregulationrategreaterthan35%,manufacturershouldspecifythemaximumsafespeedonthenameplate.AstoDCmotorsthatcanwithstand110%ofno-loadspeed,thenameplateneednotshowthemaximumsafespeed.6.9Ifliftingdeviceissuppliedandcanonlybeusedtoliftcomponents,signsshouldbegiveninaclearwayasfollows,unlessthedeviceisabletohoisttheentiremotor.Warning:“Thisdeviceisnotforliftingtheentiremotor.Itisonlyabletoliftthecomponentsattachedtoit”.Similarwarningsapply.6.10Thefollowinginformationanddescriptionsshouldbeprovided.Wherethemotorservesasacomponentofthefinalassemblyorwiringinformationhasbeencontainedintheconnectiondrawing/descriptionoftheentireequipment,orforbothsituations,thedrawingsandinstallationinstructionsasina)andb)neednotbeprovidedwitheachmotor.a)Wiringdiagram,inwhichthesymbolofterminalsshouldbeconsistentwiththeactualones.Thewiringdrawingplateshouldbefixedreliably.b)Installationinstructionsshouldbeconformtotherequirementsondewatering,mounting,andlubricationofbearings.Theinstallationinstructionsshouldalsocoverthedevicessupplied,suchasheater,windingsthermalprotector.6.11Manufacturingdateshouldbeshownwhereitcanbeeasilyseenwithouttheaidofanytool.Itcanbeshownindatecode,serialnumberorsimilarways.6.12Allsymbolsonthemotorcanbeprinted,carved,pressedorinothereffectivemethods.Thematerialofsymbolsandproductionmethodsshouldensurethatthesignsareclear,durableandwouldnotwearawayorcomeoffduringtheservicelifeofthemotor.6.13Signsandsymbolsshouldbecheckedwithvisualinspectionandbetestedaccordingto7.2.7Tests7.1GeneralprinciplesMotorsshouldbetestedasfollowingmethodstodetermineiftheymeettherequirementsinthisstandard.Motorsequippedwithheatersshouldsatisfytherequirementsofthisstandardandthatspecifiedbythemanufacturerforalloperatingconditions.7.2Testsofsymbolsandsigns7.2.1First,wipethesignswithwater-soakedclothbackandforwardonceasecondfor15seconds,andthenwithgasoline-soakedclothfor15seconds.7.2.2Afterabovetestandallthetestsrequiredbythisstandard,thesignsshouldremainclearandreadable,noteasytoremove.Thereshouldbenocurlededgeorotherfactorsthatcancausethesignstofalloff.7.3Thermaltests7.3.1Whentestedasbelow,thetemperaturerisesandtemperaturesofanypartofthemotorshouldconformto7.3.4,7.3.7andTable1.a)Astomotorswithoutspecificationofratedoutput,theratedinputcurrentcanbeobtainedbyapplyingloadonthemotor,orincreasinginputvoltage.b)Astomotorwithspecificationoftimecycles,testshouldbeconductedatratedfrequencyorratedrotationspeed,alongwithratedoutputpower.Astomotorswithcontinuousrating,testshouldbecontinueduntilthermalstabilityisachieved.7.3.2Testvoltages7.3.2.1Thermaltestshouldbeconductedundertheratedvoltagespecifiedinthenameplate.Astolargecapacitymotors,ifitisdifficulttoperformtestunderratedvoltage,testcanbeconductedaccordingtorelevantstandard.7.3.2.2AstoDCmotors(framesize≤H80)poweredthroughrectifier,thepowersupplyappliedinthetestshouldbeabletoprovideratedvoltageandspecifywaveformcoefficient,underratedload.7.3.3Astomotorswithspecifiedusagecoefficient,loadshouldbecontinuouslyappliedunderratedvoltageandfrequencyuntiltheactualoutputequalstoratedpowermultipliedbyusagecoefficient.7.3.4TestsshouldbeconductedundertheoperationconditionsasspecifiedinGB755-2000andtheproductstandard.Thetemperatureriselimits,measuringmethodsandmodifiedvaluesforwindings,coreiron,commutatorandcollectorringshouldconformtoGB755-2000.MeasurementofbearingtemperaturesshouldconformtoGB755-2000.Thetemperaturelimitsofbearingsarespecifiedinproductstandard.7.3.5Special-purposemotorsshouldbetestedaccordingtooperationconditions,includingventilation,modesofinstallation,ambienttemperaturesandtemperaturerises.7.3.6Ifthemotorhasseveralratings,testshouldbeconductedattheratingthatcouldresultinthehighesttemperature.7.3.7Junctionbox7.3.7.1TemperaturesinsidethejunctionboxandofthesupplycordsshouldnotexceedthatspecifiedinTable1.7.3.7.2Thermaltestshouldconformtofollowingrequirements:a)Thepermissiblecurrent-carryingcapacityofthewireconnectingtoexternalpoweris125%oftheratedcurrentatfullload;b)Thesupplycableoutsidethejunctionboxshouldbenolessthan1.22m;c)Supplycablesshouldgothroughconduit;d)Allunusedopeningsonthejunctionboxshouldbecovered.7.4Insulationresistance7.4.1Windingsinsulationresistanceaftertheheatstatusortemperaturerisetestshouldbenosmallerthattheoutcomeoftheequationbelow:R=Where:R—windingsinsulationresistance,unitMΩ;U—windingsratedvoltage,unitV;P—motorratedpower,unitkW,kVAorkvar.Iftheinsulationresistanceobtainedfromtheaboveequationissmallerthan0.38MΩ,thetestshouldapply0.38MΩ.7.4.2Afterthehumidityandthermaltestasin7.7,thehot-stateinsulationresistanceshouldbenosmallerthanthatspecifiedin7.4.1.7.4.3Astolowvoltagemotors,thecold-stateresistanceshouldbenosmallerthan5MΩ.7.4.4Insulationresistancemeasurementmethods7.4.4.1ThemeasurementinstrumentshouldoptforvoltagesaccordingtoTable9.7.4.4.2Astowindingsthatareconnectedtothehousingdirectlyorthroughprotectivecapacitorduringoperation,measurementshouldbeconductedafterwindingsaredisconnectedfromthehousingorprotectivecapacitor.7.4.4.3Astowindingrotormotors,theinsulationresistanceofstatorandofrotorshouldbemeasuredrespectively.7.4.4.4Astomotorswithseveralsetsofwindings,theinsulationofeachwindingshouldbemeasuredrespectively(exceptwindingswithoutearthinsulation).7.4.4.5Aftermeasurement,windingsshouldbedischargedtoearth.7.5VoltagewithstandingtestMotorinsulationshouldhaveadequatevoltage-withstandcapability.Itshouldbeabletowithstandthevoltagetestsasin7.5.1and7.5.2,withoutpunctureorflashover.Itmustbeensuredthatprotectivemeasuresareavailableduringthetestandnobodycontactsthecircuitandthemotorbeingtested.7.5.1Powerfrequencyvoltagetest7.5.1.1Thetestshouldconformto8.1ofGB755-2000.ThetestvoltagesforeverytypeofmotorshouldconformtoTable14inGB755-2000.Beforethetest,theinsulationresistanceofwindingsshouldbemeasuredasperrequirements.7.5.1.2Testshouldbeconductedontheassembledmotor.Thestatusofmotorandwiringduringtestshouldconformto8.1ofGB755-2000.Ifitisnoteasytodistinguishtheneutralpointamongthethreephasewindings,testvoltageshouldbeappliedsimultaneouslyonallwindingends.7.5.1.3Astomotorsthatarenotdesignedforelectric-shockprooforwhosesolid-statedeviceisliabletodamageduringvoltagetest,voltage-withstandtestshouldbeconductedbeforethemotorisconnectedtootherequipment.7.5.1.4Duringtest,thesurgecapacitor,lighteningarrestorandcurrenttransformershouldbedisconnectedfromwireterminalsandlinkedtorackearth.7.5.1.5Astocapacitormotors,thecapacitorshouldstayconnectedtowindingsasinthenormalworkstateofthemotor(operationorstarting).7.5.1.6Astobrushlessexcitationmotorandsynchronousmotor,whenvoltagetestisconductedonthefieldwindings,theelectroniccomponentsinthecircuit(suchasdiode,crystalbraketube)shouldbeshorteditselffirst,withoutbeinggrounded.7.5.1.7Duringtest,thespaceheaterandthermometerinthemotorshouldbeconnectedtorackearth.7.5.1.8Astomotorswithratedvoltage≤1,000kV,forevery1kVtestvoltage,thecapacityoftesttransformershouldbenosmallerthan1kVA.7.5.1.9Astomotorswithratedvoltage>1,000kV,forevery5kVtestvoltage,thecapacityoftesttransformershouldbenosmallerthan1kVA.7.5.1.10Testvoltagesshouldbemeasuredbyelectrostaticvoltmeterorvoltagetransformerorspecializedwindings,onthehigh-tensionsideoftesttransformer.Conversionusingthemeasurementonthelow-tensionsideoftesttransformerisnotrecommended.7.5.1.11Testcurrentshouldbemeasuredanddeterminedonthehigh-tensionsideoftesttransformer.a)AstomotorswithACratedvoltage≤1,000kV,DCratedvoltage≤1,500kV,theover-currentrelayofthehigh-tensiontransformerusedinthetestshouldhavereleasecurrentof100mA.Whentestcurrent≥100mA,themotorcanbejudgedtobepunctured.b)AstomotorswithACratedvoltage>1,000kV,DCratedvoltage>1,500kV,thetestresultsshouldbeassessedaccordingtorelevantproductstandard.7.5.2Impulsevoltagetest7.5.2.1Windings,patchboardandotherinsulatedpartsinrelationtohousing(earth)shouldundergoimpulsevoltagetest.7.5.2.2CageinductionmotorsinthescopeofJB/T8158shouldconformtoGB755-2000.7.5.2.3High-tensionACmotorsshouldconformtoJB/T10098-2000.7.6ProtectiontestHousingprotectionacceptanceconditionsshouldconformtoGB/T4942.1.7.7Moisture/thermaltest7.7.1Motorsshouldbeabletoendurethemoisturethatmayoccurduringnormaluse.7.7.2Unlessotherwisestated,temperature-humiditytestshouldbeconductedat40℃forsixcyclesaccordingtoGB/T2423.4-1993.Afterthetest,thehot-stateinsulationresistanceshouldbenosmallerthanthatspecifiedin7.4.Themotorshouldpassthepower-frequencyvoltage-withstandtest,withthetestvoltagebeing80%ofthatspecifiedin7.5.1.1.7.8Mechanicalstrengthtest7.8.1Over-speedOver-speedtestshouldbeconducedontherotatingpartsasperGB755-2000stipulatedin8.5.Afterthetest,thereshouldbenopermanentabnormaldeformationorotherfaults.Rotorwindingsshouldmeettherequirementsofvoltage-withstandtest.7.8.2Short-timeovertorqueMotorshouldbeabletowithstandtheshort-timeovertorquetestasper8.3ofGB755-2000,withouthavingabruptchangeorhaltinrotatingspeedorharmfuldeformation.7.8.3Impacttest7.8.3.1Astonon-metallichousing,anypointonthesurfaceshouldbeabletosustaintheshockproducedbyaø51mm,0.53kgsteelballthatfallsfromaheightof1,300mm,whichisequivalentof6.78J.7.8.3.2Thetestasin7.8.3.1shouldbeconductedatroomtemperature.7.8.3.3Afterthetestasin7.8.3.1,thereshouldnodamagethatwouldaffectitsfurtheruse,andclearance/creepagedistanceshouldnotbereduced.7.8.4Junctionboxstaticpressuretest7.8.4.1Junctionboxshouldbedurableandfixedfirmly,withoutharmfuldeformationorloosening.Testshouldbeconductedaccordingtothemethodsbelow.7.8.4.2AstothejunctionboxofmotorswithframesizegreaterthanH90,itssurfaceshouldbeabletosustainverticalstaticpressureof1,060Nforoneminute.Thisverticalstaticpressureisnotrelevanttotheplacewherethemotoristobemounted.Astomotorswithframesize≤H90,thehorizontalsurfaceofthejunctionboxshouldbeabletosustainaverticalstaticpressureof0.135N/mm2(135kPa),themaximumbeing1,060N.7.8.4.3Thisstaticpressureshouldbeappliedbyaflatmetalsurfaceø50.8mm.Aftertest,thefunctionofjunctionboxshouldnotbeaffectedandtheclearance/creepagedistanceshouldbenosmallerthanthatspecifiedinTable4orTable13.7.8.5Conduitthreaded-inlettestTheinletholeofrigidmetallicconduitshouldbeabletoendurethefollowingtestswithoutbeingbroken.ThetesttorqueappliedontheconduitwithtappedholeisspecifiedinTable10.a)Bendinginanydirection;b)Applytorqueinthedirectionoftighteningtheconduit7.8.6WireterminalstrengthPatchboardandwireterminalsshouldhaveadequatemechanicalstrengthandrigidity,withoutbeingdamagedwhensubjecttothesettorqueasspecifiedinTable11.7.8.7LiftingdeviceThehookeyesorsimilardevicesforthepurposeofliftingmotoranditscomponentsshouldhaveadequatemechanicalstrength.Duringaxialloadtest,theliftingdeviceshouldnothavepermanentdeformationortwisting.HookeyeaxialloadtestshouldconformtoGB/T825-1988.7.9Supplycordclamps7.9.1Supplycordclampsshouldbecheckedthroughtensionandtwistingtest.Duringtest,thesupplycordiscutat100mmfromtheclampandapplystaticpressureasspecifiedinTable12ontothecordforoneminute.Themotorshouldbeplacedinanypermissibleposition,tomaketheclampsubjecttotensileforce.Aftertest,therelativedisplacementoftheclampedpointsfromtheclampshouldbenogreaterthan1mm.7.9.2Applyaforcemoment0.28N·mbetweenclampdeviceoutercoverandcableforoneminuteandthecableshouldnothavetwisting.7.10Insulationsystemappraisal7.10.1Astolow-voltagerandomwindingmotors,thermalenduranceappraisalshouldbeconductedontheinsulationsystemasperGB/T17948.1-2000orIEC60034-18-22:2000.Astoformedwindingmotors,thermalenduranceappraisalshouldbeconductedontheinsulationsystemasperIEC60034-18-31:1992orJB/T7589-1994.Atcorrespondingtemperatures,thethermalenduranceofinsulationsystemshouldbelongerthan20,000h.7.10.2Astohigh-voltageformedwindingmotors,electricallifetestshouldbeconductedontheinsulationsystemasperIEC60034-18-32:1995.Undercorrespondingvoltagesatroomtemperature,theelectricallifeshouldbenoshorterthan100,000h.7.10.3Ifmaterialwithoutbeingappraisedthroughinsulationtestistobeusedintheinsulationsystemthathasbeentested,compositionreplacementtestshouldbeconductedaccordingtoIEC60034-18-22:2000.7.10.4Integralinsulation7.10.4.1Astomotorvoltage≤750V,ifintegralinsulation(e.g.,epoxycoating)replacestheslotlinerwinding,statororrotorwinding,testshouldbeconductedonthespecimenwindingaccordingto7.10.4.2~7.10.4.7.7.10.4.2Voltageendurancetestshouldbeconductedonthespecimenunder1,500Vforoneminute.Astospecimenwindingofmotorvoltagegreaterthan250V,voltageendurancetestshouldbeconductedunder2UN+1,000Vforoneminuteandthewindingshouldnotbepuncturedaftertest.7.10.4.3Theageingtreatmentcyclesforthespecimen:GradeAinsulation—175℃,24h;GradeBinsulation—200℃,24h;GradeFinsulation—220℃,24h.Thenthespecimenisleftunderrelativehumidity80%~90%for24h,at30℃,withapermissibletoleranceof(2℃.7.10.4.4Thespecimenshouldreceivesecondtreatmentaspertheageingtreatmentcyclesin7.10.4.3.Thenitisplacedinhardwatersolutionof25(0.5℃for24h.Thesolutionispreparedbyadding0.5gCaSO4tooneliterofdistilledwater.7.10.4.5Leavethespecimeninaplacewithlittleair-flowatnormalroomtemperature.Theairdryingprocessshouldbenoshorterthan7h.7.10.4.6Theinsulationresistanceofthespecimenshouldbemeasuredwith500VMegohm-meteratroomtemperature.Theinsulationresistanceshouldbenosmallerthan0.5MΩ.7.10.4.7Voltageendurancetestshouldbeconductedagainonallspecimensasper7.10.4.2.Thespecimensshouldpassthetestwithoutbeingpunctured.7.11Nonmetallicmaterialageingtest7.11.1Weatherresistancetestshouldbeconductedonnonmetallicmaterialandnonmetalliccomponentsinthemotor,suchasplasticfan,plasticwindshield,plasticjunctionbox,accordingtoGB/T16422.2-1999.Afterthetest,theirmechanicalproperties(tensilestrengthorimpactresistanceorbendingstrength)shouldbenosmallerthan50%oftheoriginalmaterial.7.11.2Theflexiblepartsmadefromrubberorsimilarmaterial(e.g.,pad,ringseal)shouldhaveageingresistance.Testshouldbeconductedasfollows:7.11.2.1Leavetheflexiblepartsinheatingroomof70℃(2℃for240h.Theheatingroomhasthesameairpressureandcompositionasthesurroundingatmosphere,andnaturalcirculatingventilation.7.11.2.2Thenleavethespecimenunderrelativehumidityof45%~55%atroomtemperaturefornolessthan24h.7.11.2.3Afterthetest,checkthespecimenbyvisual.Itssurfaceshouldnotbecomechapping,shrinking,stickyorgreasy.7.12Thermaldeformationresistance7.12.1Nonmetallicmaterialandnonmetalliccomponents(exceptceramics)inthemotorshouldhaveadequatethermaldeformationresistance.7.12.2Thenonmetallicexternalcomponents,suchasjunctionbox,coolingfan,outerwindcover,shouldpassthesphericalpressuretestat75℃.7.12.3Theinsulationthatfixorsupportnon-currentcarryingcomponents,suchaspatchboard,plasticcommutator,plasticcollectorring,shouldpassthesphericalpressuretestat125℃.7.12.4Sphericalpressuretestingdeviceisasshowninthediagram.Diagram1Sphericalpressuretestingdevice7.12.5SphericalpressuretestmethodsBeforetest,leavethespecimeninatmosphericconditionswithrelativehumidity45%~75%,at15℃to35℃,for24h.Putthespecimenhorizontallyonasteelplatenothinnerthan5mm,andsubjectittoaverticalpressureof20Nunderaø5mmsteelball.Placetheentiredevicewiththespecimenintoanoven75℃(2℃or125℃(2℃.Anhourlater,removethedeviceandimmediatelyputthespecimenintocoldwater,toletitcooldowntoroomtemperaturewithin10seconds.Measuretheimprintonthespecimenanditshouldbenobiggerthan2mmindiameter.Thespecimenshouldbenosmallerthan2.5mminthickness.Ifitsthicknessissmallerthan2.5mm,severalspecimenscanbeputtogethertoachievethedesirablethickness.7.13Burningtest7.13.1Nonmetallicmaterialandnonmetalliccomponents(exceptceramics)inthemotorshouldhaveadequateflameretardancy.7.13.2Flameretardancyshouldbetestedaccordingtothemethodsbelow.7.13.2.1Astoinsulatingpartsthatsupportterminals,suchaspatchboard,glowwiretestshouldbeconductedasperGB/T5169.11-1997,at960℃(15℃,foracontinuousperiodof30s(1s.7.13.2.2Astoinsulatingpartsthatmaybesubjecttocontactsparksduringnormalorabnormaloperation,suchascommutator,collectorring,brushholder,centrifugalswitch,glowwiretestshouldbeconductedasperGB/T5169.11-1997.Withregardtopartsthatsupportcurrent-carryingcomponents,thetesttemperatureshouldbe960℃(15℃.Withregardtopartsthatsupportnon-currentcarryingcomponents,thetesttemperatureshouldbe650℃(10℃.Testlastsforacontinuousperiodof30s(1s.7.13.2.3Astononmetallicexternalcomponentssuchasfan,outerwindshield,wirebox,firehazardtestshouldbeconductedasperFHofGB/T11020-1989.TestresultshouldbeuptoFH2-40mmgrade.Alternatively,glowwiretestcanbeconductedasperGB/T5169.12-1999,at650℃(10℃,foracontinuousperiodof30s(1s.7.13.2.4Astosupplycables/cords,burningtestshouldbeconductedasperGB/T18380.1-2001,GB/T18380.2-2001,andGB/T18380.3-2001.7.14Electrictrackingresistance7.14.1Insulationthatsupportschargedpartsandinsulationbetweenchargedpartsandadjacentunchargedparts(e.g.,windingimpregnatingpaint,sealingresin,coatings)shouldhaveelectrictrackingresistance.7.14.2Patchboard,plasticcommutator,andplasticcollectorringshouldbetestedasperGB/T4207-2003todeterminetheircomparativetrackingindex(CTI).TheirCTIshouldbenosmallerthan175V.7.14.3Ifthemotorisassembledwithotherequipmentsandtheentireassemblyrequireshigherelectrictrackingresistance,testshouldbeconductedconformingtotherequirementsoftheassembly.7.14.4Ifspecimensigniteduringtest,itsuggeststheyfailtherequirements.7.15Accessoriestest7.15.1Motoraccessories,suchascentrifugalswitch,auxiliaryswitch,capacitor,powersupplyplugs,shouldconformtorelevantproductstandards.7.15.2Unlessotherwisestated,accessoriesshouldbetestedaccordingtothisstandard,aspartofthemotor.7.16Rustingresistance7.16.1Ifmetallicpartsmayresultinmotorinflammation,electricshockorpersonalinjuries,thesepartsshouldbepainted,coated,electroplatedorothermeanstoensuretheiranti-rustcapability.7.16.2Withtheexceptionofcommutator,collectorringandbrushes,current-carryingcomponentsmustbeelectroplated,withtheelectroplatingnothinnerthan5μm.Externalmetallicparts,rotorcoreoutersurfaceandstatorcoreinternalsurfaceshouldreceiveanti-rustingtreatment.7.16.3Iftherustingresistanceofpartsisunknown,followingtestshouldbeconducted.a)Putthespecimenintetrachloro-methaneortrichloroethyleneorpuregasolinefor10min,toremovegreaseorforeignmatters;b)Putthespecimenin10%ammoniumchloridesolutionof20℃(5℃for10min;c)Takeoutthespecimenandshakewateroff(withoutwiping).Leaveitinatestchamberwithsaturatedhumidityand20℃(5℃for10min;d)Putthespecimeninanovenof100℃(5℃todryupfor10min;e)Aftertheproceduresa)tod),thetestedpartshouldshownosignofrust,exceptforrustandlightyellowfilmonthesharpedges.8Low-tensionACmotorwithratedvoltage≤1,000V(includinguniversalmotor)8.1ScopeThischapterisapplicabletoACmotorswithratedvoltage≤1,000V(includinguniversalmotor).8.2Structure8.2.1GeneralprinciplesExceptthemodificationsin8.2orunlessotherwisestated,therequirementsinChapter5areapplicable.8.2.2EmbeddedtemperaturedetectorThelead,withrespecttorelevanttemperaturesandvoltages,shouldhavethesameinsulationgradeasotherpartsofthemotor.8.2.3Clearanceandcreepagedistance(supplementaryrequirementsformotorsofframesize≤H80)Regardingmotorratedvoltage≤30V,theclearance/creepagedistancebetweentwonakedchargedpartsofoppositepolarityshouldbenosmallerthan1.6mm;theclearance/creepagedistancebetweennakedchargedpartsandgroundingmetalshouldbenosmallerthan1.2mm.8.2.4Mechanicalstrength(supplementaryrequirementsformotorsofframesize≥H315)8.2.4.1Coilendsshouldbeabletoendurethesurgeduringnormalstartingandoperationwithbeingdisplaced.8.2.4.2Whereringendsofcoilaresupported,theinsulationbetweenconductorandmotorbedplateshouldconformtorelevantvoltagerequirement.8.3SignsandSymbolsTherequirementsinChapter6areapplicable.8.4TestTherequirementsinChapter7areapplicable.9High-tensionACmotorswithratedvoltagegreaterthan1,000V9.1ScopeThischapterisapplicabletohigh-tensionACmotorswithratedvoltagegreaterthan1,000V.9.2Structure9.2.1GeneralprinciplesExceptthemodificationsin9.2orunlessotherwisestated,therequirementsinChapter5areapplicable.9.2.2Housing9.2.2.1Exceptopen-typemotors,thereshouldbenoopeningtoallowcontacttochargedpartsofover1,000V.Unlessthosepartshavebeeninsulated,accidentalcontactshouldbeavoided.9.2.2.2Theprotectivepanelorcoveringonchargedpartsofover1,000Vshouldbearthesignsandsymbolsasrequiredin9.3.2,unless:a)thepanelorcoveringisacomponentofopen-typemotors;b)thebarechargedpartshavebeensafelyinsulatedaspervoltagerequirement.9.2.2.3Astomotorswithair-waterclosedself-circulation,thereshouldbedevicestopreventwaterdroppingontochargedparts.Thedevicesincludewatertank,waterhose,andsealsoncoveringorwindings.9.2.3Mechanicalstrength8.2.4.1and8.2.4.2ofthisstandardareapplicable.9.2.4Internalwirearrangement(forvoltagegreaterthan1,000V)9.2.4.1Whereasingleconductorpassesthesurfaceofmagneticmaterial,aslotshouldbemadeonthesurface,biggerenoughtoletitgetthrough,sothatthecirculatingcurrentthatbypassesthenotchisminimal.9.2.4.2Whereasingleconductorpassesthemetalsurface,insulatingsleeveshouldbeused,whichcanreducetheelectricalandmechanicalstressoftheinsulationnearbytoanacceptablelevel.9.2.4.3Iftheinsulatingsleeveasin9.2.4.2ismeanwhileusedtoincreasetheinsulationoflead(e.g.,theratedvoltageofleadislowerthanthatofthemotor),thethicknessofthesleeveshouldbeamajorstandardagainstwhichtodetermineitsapplicability.9.2.4.4Ifinsulatingmaterialisusedtosupportsomehigh-tensionleadsthatpassthemetalsurface,thetransverseclearanceoftheinsulatingmaterialbetweenconductorandthemetalthatmaygroundduringinstallationshouldbemainlyexamined.9.2.5Clearanceandcreepagedistance9.2.5.1Inthejunctionbox,theclearance/creepagedistancebetweendifferentnakedchargedpartsorbetweendifferentpolarity,andtheclearance/creepagedistancebetweennakedchargedparts(includingmagneticwire)andnon-currentcarryingmetalormovablemetallichousingshouldbenosmallerthatspecifiedinTable13.9.2.5.2Whereapplicable,theinsulationthatpartitionsnon-currentcarryingmetallicpartsandsolidpartsshouldbefixedreliably.Thepuremicapartitionshouldbenothinnerthan0.25mmorequivalentinsulationcanbeused,andthecreepagedistanceshouldbenosmallerthatspecifiedinTable13.9.2.5.3Whereapplicable,asanothersituationof9.2.5.2,heatsinksthatsupportsolidcomponentbecomesanakedchargedpart,andtheclearance/creepagedistanceshouldconformtoTable13.9.3Signsandsymbols9.3.1Excepttherequirementin9.3.2,requirementsinChapter6areapplicable.9.3.2Thepanel,junctionboxcoverandbrushholdercoverthatareclosetohightensioncomponents(over1,000V),unlessthehightensioncomponentshavebeeninsulated,shouldbear“DangerHighTension”orequivalentsigns,orshouldbemarkedwithsymbolNo.5036(blacklighteningonyellowbackgroundinblackframe)asperGB/T5465.2-1996.9.4TestRequirementsinChapter7areapplicable.10DCmotors10.1ScopeThischapterisapplicabletoDCmotorsandgenerators,includingDCmotorspoweredbystaticrectifier(excludinguniversalmotors)10.2Structure10.2.1GeneralprinciplesExceptthemodificationsin10.2orunlessotherwisestated,therequirementsinChapter5areapplicable.10.2.2Housing10.2.2.1Exceptopen-typemotors,thereshouldbenoopeningtoallowcontacttochargedpartsofover1,500V.Unlessthosepartshavebeeninsulated,accidentalcontactshouldbeavoided.10.2.2.2Theprotectivepanelorcoveringnearchargedpartsofover1,500Vshouldbearthesignsandsymbolsasrequiredin9.3.2,unless:a)thepanelorcoveringisacomponentofopen-typemotors;b)thebarechargedpartshavebeensafelyinsulatedaspervoltagerequirement.10.2.3Internalwirearrangement10.2.3.1Leadsincludingtemperaturesensor,armatureandexcitationcircuitleadsshouldconformtotherequirementsinchapters4~6.10.2.3.2Temperaturesensorleadandlow-tensioncomponentsthatcontacthigh-tensionmotorleadsshouldbeinsulatedasthesamewaywithhighvoltages.10.2.4Clearanceandcreepagedistance10.2.4.1Forratedvoltage≤1,500V,clearanceandcreepagedistanceshouldconformto5.8.Forratedvoltage>1,500V,theclearance/creepagedistancebetweenchargedpartsofdifferentpolarityandbetweenchargedpartsandnon-currentcarryingmetalshouldbenosmallerthan0.0127mm/V.10.2.4.2Astocircuitofabove1,500V,thespacershouldbenothinnerthan1.6mm;10.2.4.3Astocircuitofabove1,500V,thecreepagedistanceoverthesurfacewithaccumulatedcarbonsootshouldbegreaterthanthatspecifiedin10.2.4.1by50%atleast.Otheralternativedevicesincludeappropriatepartition,ringwasherorequivalents.10.2.5Liftingbracket10.2.5.1Astomotorbearingthatismountedonthebedplatebywayofendcoverorothermeans,theliftingbracketshouldbeabletolifttheentiremotorsafely.10.2.5.2Regardingmotorsthataremarkedasin6.9andwhosebearingismounteddirectlyongroundbaseorbedplatebywayofbearingpedestalorothermeans,theliftingbracketshouldatleastbeabletolifttheattachedparts.Theliftingbracketovertheseparatebedplateshouldonlybeabletolifttheupperpart.10.3Signsandsymbols10.3.1Except10.3.2and10.3.3,therequirementsinChapter6areapplicable.10.3.2Whentherequirementsexceptof6.1areapplicable,motorsshouldbearthefollowinginformation,onthenameplate,orimprintedonthebedplateorhousinginaclearway,orinotherwaysthatthesignswillremainpermanent.a)AstoDCmotorswithwater-airheatexchanger,themaximumtemperatureandminimumflowrateofinletcoolingwatershouldbespecified.b)Astomotorswithindependentventilationpipe,coolingairvolumeperminuteshouldbespecified.10.3.3Panelsorcoversprovidingaccesstochargedpartsthatmaybeover1,500Vshouldbearthesignsasrequiredin9.3.2,unless:a)Thepanelorcoverispartoftheopen-typemotorb)Thebarepartshavebeeninsulatedaspervoltagerequirement.10.4Test10.4.1GeneralprinciplesExcept10.4.2and10.4.3,therequirementsinChapter6areapplicable.10.4.2VoltagewithstandingtestTherequirementsin7.5areapplicable,orDCvoltageequals10.4.3WaterprooftestIfthedrip-proofhousingcanbejudgedtomeetrequirements,byvisualinspectionorfromthemotoroutlinedrawing,thetestasin7.6maybeabsent.11Portableandauxiliarygenerators11.1ScopeThischapterisapplicabletoportableandauxiliarygeneratorsofratedvoltage≤240V,power≤12kW.11.2Structure11.2.1GeneralprinciplesExcept11.2.2to11.2.4,therequirementsinChapter5areapplicable.11.2.2Housingorcovering11.2.2.1AstopanelsorcoversthatprovideaccesstonakedchargedpartsofACvoltageequivalenthigherthan30VorDCvoltagehigherthan50V,itmustbeensuredthattheycanbeopenedonlybetoolorkeys.11.2.2.2Thesizeandshapeoftheopeningsonpanel/coveringshouldbesodesignedthataprobewithenddiameter11.7mmcannotenterandreachthenakedchargedpartsorrotatingpart.Iftheminimaldistancebetweennakedchargedparts/rotatingpartandopeningonthecoverexceeds100mm,theprobeusedintestshouldbe19mmindiameter.Probesshouldbeusedconformingto11.4.3.11.2.2.3Ifhousingandfancasingarenonmetallic,theyshouldconformto5.3.2.11.2.3Junctionbox(formotorvoltage≤750V)11.2.3.1Junctionboxpanelorcovershouldbemadefromfire-retardingmoisture-resistantandoil-resistantmaterial.Ifmadefrommetal,itsthicknessshouldconformtoTable2.Junctionboxpanelorcovershouldsatisfythestaticpressuretestrequirementsasin7.8.4.11.2.3.2Nonmetallicpanel/coverofjunctionboxshouldbeabletowithstandtheimpacttestasin7.8.3andtheburningtestasin7.13.11.2.4Lead11.2.4.1Leadshouldhavepropercurrent-carryingcapacityandlengths.11.2.4.2Armature,excitation,rotorandstatorwindingsleadsthatconnecttopowersupplyshouldbenosmallerthan0.3mm2incross-sectionalarea.11.2.4.3Asforleadsofwinding/brushholder,iftheycannotbefixedwithrigidsupporttoensureappropriateclearance,insulatedconductorsshouldbeusedorthermal-andmoisture-resistantmaterialshouldbeusedtowrapupcontinuouslybetweentwosupportpoints.Thematerialcanbeinsulatingpad,insulatinghoseorotherappropriateones.11.2.4.4Leadinsulationshouldbeabletowithstandthehighesttemperaturesthatmightoccurduringnormalwork.11.2.4.5Leadsshouldhaveadequatestability;orshouldbefixedmechanicalmeanstoavoidcontactwithmovableparts.11.2.4.6Whereleadspassmetalormetallicsmoothedge,thereshouldbemeasurestoavoidwearingofinsulation.Regardingportablegeneratorsonly,washers,sleevesorotherdeviceswithequaltemperatureratingshouldbeusedtowearingofinsulation.11.3Signsandsymbols11.3.1AccordingtorequirementsonsignsandsymbolsinGB4706.1-1998andGB755-2000,whereapplicable,motorsshouldbearthefollowinginformation,onthenameplate,orimprintedonthebedplateorhousinginaclearway,orbyotherpermanentmeans.a)Nameofmanufacturer,trademark,nameoftrademark,orothersymbolicsigns;b)Model,category,typeorotherdesignations;c)Ratedoutputpower,unitVA,WorkW;d)Timerating(ifnotcontinuousduty);e)Ratedrotatingspeedorsynchronousspeed(r/min);f)DC(applicabletoDCgenerators)g)Hz(applicabletoACgenerators)h)Phasenumber(applicabletoACgenerators),maynotbemarkedonsingle-phasegenerators;i)Maximumambienttemperature(℃);j)Astoauxiliarygenerators,“auxiliary”shouldbemarked;k)AstocontinuousratingACgeneratorsasspecifiedin11.4.1.3,thereshouldbenotice“ina24hcycle,canworkoverloadby10%,for2h”;l)Ifusagecoefficientisgreaterthan1.0,itmustbespecified;m)Manufacturingdate,datecode,serialnumber,orothermeans.11.4TestAstoportableandauxiliarygenerators,11.4shallreplaceChapter7.11.4.1Thermaltest11.4.1.1Astomotorswithspecifiedusagecoefficient,loadshouldbecontinuouslyapplieduntiloutput(currentorpower)equalsratedoutputmultipliedbyusagecoefficient.11.4.1.2Ifthemotorhasseveralratings(e.g.,ACandDC),testshouldbeconductedattheratingthatcouldresultinthehighesttemperature.11.4.1.3Inconsistencewiththepermissiblemaximumtemperatureasspecifiedin11.3.1k)forcontinuousratinggenerators,overloadby10%for2h(ina24hcycle)shouldconformtothefollowingpermissibletemperatures:GradeAinsulation≤125℃;GradeBinsulation≤145℃;GradeFinsulation≤170℃;GradeHinsulation≤190℃.11.4.2Patchboard11.4.2.1TemperaturesonpatchboardorinjunctionboxandonthesurfaceofsupplycablesshouldnotexceedthatspecifiedinTable1.11.4.2.2Regardingauxiliarygeneratorsonly,therequirementsof11.4.2.1shouldbesatisfiedunderfollowingconditions:a)100%ofratedcurrent;b)Thesupplycableoutsidethejunctionboxshouldbenolessthan1.22m;c)Supplycablesshouldgothroughconduit;d)Allunusedopeningsonthejunctionboxshouldbecovered.11.4.3ProbetestWheninstalled,thestationarygeneratorshouldbetestedwithprobethatconformsto11.2.2.2andappliesaxialforce26.5Ninanydirection.Duringtest,thegeneratorshouldremainattheinstallationposition.11.4.4Impacttest11.4.4.1Astonon-metallichousingandpanelofthegenerator,anypointonthesurfaceshouldbeabletosustaintheshockproducedbyaø51mm,0.53kgsteelballthatfallsfromaheightof1,300mm.Thetestisconductedatroomtemperature.11.4.4.2Afterthetestasin11.4.4.1,thenon-metallichousingandpanelshouldsatisfytherequirementsof11.2.2.2.12Variable-frequency&adjustable-speedmotor12.1ScopeThischapterisapplicabletoACmotorsequippedwithfrequencyconverter.12.2Structure12.2.1ThebasicrequirementsinChapter5,8and9areapplicable.12.2.2AstomotorswithframesizegreaterthanH280andpoweredbyfrequencyconverter,appropriatemeasuresshouldbeadoptedtoavoidshaftcurrent.12.3Signsandsymbols12.3.1InadditiontothesignsasrequiredbyChapter6,8and9,thefollowingdatashouldbespecifiedonvariable-frequencymotors:a)Applicationscope(e.g.,variable-frequencymotor);b)Designedrotationspeedrange;c)Designedtorqueapplications(e.g.,variabletorque,constanttorque,constantpowerorsimilarspecification).12.3.2Motorswithintegralfrequency-converterneednotbespecifiedas12.3.1c).12.4Test12.4.1GeneralprinciplesExcept12.4.2to12.4.3,therequirementsinChapter7to9areapplicable.12.4.2PowersupplyTestvoltageandfrequencyshouldbeconsistentwiththeoutputvoltageandfrequencyoffrequencyconverterwithinthescopeofapplication.Themodeloffrequencyconvertershouldisspecifiedaspertherequirementsofmanufacturer.12.4.3ThermaltestWhentestisconductedwithinthespeedrangeaccordingto7.3,everypartofthemotorshouldconformtothetemperatureriseandtemperaturerequirementsasinGB755-2000andrelevantproductstandards.Table1Permissiblemaximumtemperaturesofjunctionbox(againsttheambienttemperature30℃) Motorinsulationthermalwithstandgrade A,E B F H Permissiblemaximumtemperaturesforinsidejunctionbox,patchboardandsupplycord/℃ Housingsotherthanhermeticventlessones 75 75 90 110 Hermeticventlesshousing 75 90 110 110 Note:themaximumtemperaturesareobtainedagainsttheambienttemperature30℃.Thermaltestcanbeconductedatanyroomtemperaturebetween0~40℃.Maxtesttemperature=measuredtemperature+(30℃-labroomtemperature)or=measuredtemperature-(labroomtemperature-30℃).Table2Thicknessofmetallicjunctionbox Typeofmetal Minimumthickness*/mm Thinsteelplate 1.1 Castiron 3.2 Wroughtiron 2.4 Diecastingmetal Astoanarea>15,500mm2oranyside>150mm 2.4 Astoanarea≤15,500mm2oranyside≤150mm 1.6 *Iftestshowsithasequivalentrigidity,thinnersteelcanbeapplied,exceptattheconduitinlet.Table3Conduitminimumdiameters(astomotors750Vandcopperconductor) Mono-phaseACandDCmotors Multi-phaseACmotors Currentatfullload/A Conduitminimumdiameters/mm Currentatfullload/A Conduitminimumdiameters/mm 16 12.7 12 12.7 24 12.7 16 12.7 36 19.1 24 12.7 52 25.4 36 19.1 80 31.8 52 25.4 104 38.1 68 25.4 120 38.1 80 31.8 140 38.1 92 31.8 160 50.8 104 38.1 184 50.8 120 38.1 228 63.5 140 50.8 248 63.5 160 50.8 280 38.1(2)* 184 50.8 320 50.8(2)* 204 63.5 368 50.8(2)* 228 63.5 408 50.8(2)* 248 63.5 456 63.5(2)* 280 50.8(2)*Table3(continued) Mono-phaseACandDCmotors Multi-phaseACmotors Currentatfullload/A Conduitminimumdiameters/mm Currentatfullload/A Conduitminimumdiameters/mm 496 63.5(2)* 320 50.8(2)* 552 50.8(3)* 368 50.8(2)* 612 50.8(3)* 408 63.5(2)* 684 63.5(3)* 456 63.5(2)* 744 63.5(3)* 480 50.8(3)* 804 63.5(3)* 552 50.8(3)* 912 76.2(3)* 612 63.5(3)* *Twoormoreparallelpowercablesenteringthejunctionboxshouldbeequippedwithtwoorthreeconduits.Fewerbutbiggerconduitscanbeusedinstead.Table4Minimumclearancebetweennakedchargedparts Relativeparts RelevantmaximumvoltagesV Minimumclearance/mm Betweennakedchargedpartsofdifferentvoltages Betweennon-currentcarryingmetalandnakedchargedparts Betweenmovablemetalcoverandnakedchargedparts Clearance Creepagedistance Clearance Creepagedistance Clearance Creepagedistance Motorswithframesize≤H90 Wireterminal 31~375 6.3 6.3 3.2 6.3 3.2 6.3 376~750 6.3 6.3 6.3 6.3 9.8 9.8 Componentsotherthanwireterminal,includingplateandbarconnectedtoterminal 31~375 1.6 2.4 1.6 2.4 3.2 6.3 376~750 3.2 6.3 3.2＋ 6.3＋ 6.3 6.3 Motorswithframesize>H90 Wireterminal 31~375 6.3 6.3 6.3 6.3 6.3 6.3 376~750 9.5 9.5 9.5 9.5 9.8 9.8 Componentsotherthanwireterminal,includingplateandbarconnectedtoterminal 31~375 3.2 6.3 3.2＋ 6.3＋ 6.3 6.3 376~750 6.3 9.5 6.3＋ 9.5＋ 9.8 9.8 Note:Thecreepagedistancebetweenchargedsolidcomponents(e.g.,diodeandsiliconcontrolledrectifierinthemetallicbox)andsupportingmetalsurfacecanbehalfthatspecifiedinTable4,butshouldbenosmallerthan1.6mm.+:Electromagneticwireisregardedasanon-insulatingchargedpart.Wherevoltagedoesnotexceed375V,iftheclearancebetweenproperlysupportedwireandunchargedmetallicpartis2.4mmatminimum,measuredthroughairoralongthesurface,itisappropriate.Wherevoltagedoesnotexceed750V,ifcoilshavebeenimpregnatedorsealed,theclearanceof2.4mmisappropriate.Table5Minimumdiametersofgroundingscrews Motorratedcurrent/A Minimumdiametersofgroundingscrews/mm ≤20 4 >20~200 6 >200~630 8 >630~1000 10 >1000 12Table6ConnectionBolt Permissiblecontinuouscurrent/A Minimumdiametersofbolt/mm Materialofbolt 10 3.5 Brass(H62) 16 4 25 5 63 6 100 8 160 10 250 12 315 16 400 20 200 10 Copper 315 12 400 16 630 20 800 24 1000 30 1250 33 1600 36 25 5 Steel(galvanized) 63 6 100 8 200 10 400 12 630 16 Table7ChipTerminal Setboltminimumdiameter/mm 8 10 12 16 20 PermissiblecontinuouscurrentA Copperbarsingle-sidecontact 160 315 500 1000 1600 Copperbardouble-sidecontact 315 630 1000 2000 3200 Copperbarminimumwidth/mm 20 25 30 35 50Table8Looselead-out Permissiblecontinuouscurrent/A 8 12 20 25 32 50 65 85 Recommendedcrosssectionofcable/mm2 1.0 1.5 2.5 4 6 10 16 25 Permissiblecontinuouscurrent/A 115 150 175 225 250 275 350 400 Recommendedcrosssectionofcable/mm2 35 50 70 95 120 150 185 240 Permissiblecontinuouscurrent/A 500 630 800 Recommendedcrosssectionofcable/mm2 150 185 240 Numberofsupplycables 2 2 2Table9Insulationresistancemeasurementvoltage Motorwindingratedvoltage/V <500 500～3300 >3300 Insulationresistancemeasurementvoltage/V 500 1000 ≥2500Note:astomotorswiththermo-detector,whenmeasuringtheinsulationresistancebetweenthermo-detectorandthewindings/housing,thevoltageshouldbenogreaterthan250V.Table10Bendingandsettorque Specificationsofconduitthread Settorque/(N·m) M12×1.5 34 M20×1.5 57 M24×1.5 80 M30×2 113 M36×2 136 M52×2andabove 181Table11Settorqueofwireterminal Wireterminaldiameter/mm 3.5 4 5 6 8 10 12 16 20 24 Settorque/(N·m) 0.8 1.2 2.0 3.0 6.0 10.0 15.5 30.0 52.0 80.0Table12Supplycordstatictensionendurance Typeofcable(cord) Statictension/N Cordconnectingtopowersupply 157 Cordconnectingtocomponents 88Table13Minimumclearancebetweennakedchargedpartsforvoltage≥1,000V Relativeparts RatedvoltageV Minimumclearance/mm Betweennakedchargedpartsofdifferentpolarity Betweennakedchargedpartsandnon-currentcarryingmetal Betweennakedchargedpartsandmovablemetalcover Clearance Creepagedistance Clearance Creepagedistance Clearance Creepagedistance Wireterminal 1000 11 16 11 16 11 16 1500 13 24 13 24 13 24 2000 17 30 17 30 17 30 3000 26 45 26 45 26 45 6000 50 90 50 90 50 90 10000 80 160 80 160 80 160 Note1:whenthemotorisenergized,thereductioninclearancebetweenrigidpartsduetomechanicalorelectricalstressshouldnotexceedthatspecifiedby10%.Note2:theclearancesinthetableareapplicablewhentheelevationofworksiteisnohigherthan1,000m.Atelevationsabove1,000m,theclearancesinthetableshouldincreaseby3%foreveryriseof300m.Note3:regardingneutrallineonly,theinputvoltageinthetableshouldbedividedbyNote4:formotorsvoltage≤750V,refertoTable4.Note5:clearancesinthistablecanbereducedbyusinginsulationspacers.Theeffectivenessofsuchprotectioncanbeprovedbyvoltage-withstandingtest.NationalStandardofthePeople’sRepublicofChinaSafetyRequirementsofSmallandMediumSizeRotatingElectricalMachinesGB14711-2006*PublishedbyStandardsPressofChina16SanliheNorthStreet,FuxingmenWai,BeijingPostcode:100045Website:www.bzcbs.comTel:6852394668517548PrintedbyQinhuangdaoPrintingFactoryofStandardsPressofChinaDistributedbyXinhuaBookstores*Format880×12301/16Impression1.75NumberofChineseCharacters:43,000Firstedition:Dec.2006Firstprinting:Dec.2006*Incaseofprintingorbindingerror,ourdistributioncenterisresponsibleforexchange.Exclusivecopyright,infringementmustbepunished.Call(010)68533533toreport.SpecimenSphericalsurfaceGB14711-2006�Puremicanothinnerthan0.25mmcanalsobeused.