UL507文档格式.docx

UL507文档格式.docx

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Ratedvoltage

Inputtestvoltage

Temperaturetestvoltage

Bladeignitiontestvoltage

110―120

191―208

210―240

254―277

440―480

550―600

Rated

120

208

240

277

480

600

Fornameplateratingotherthanoneofthosespecifiedinthetable,themotoristobetestedat100―105percentoftheratedvoltage.However,considerationistobegiventothevoltageoftheintendedsourceofsupplyforamotor.

29LeakageCurrentTest

29.1Acord-connectedproductratedforanominal240-voltorlesssupplyshallbetestedinaccordancewith29.3-29.6.Leakagecurrentshallnotexceed:

a）0.5milliampereforanungrounded2-wireproduct;

b）0.5milliampereforagrounded,3-wire,portableproduct;

and

c）0.75milliampereforagrounded,3-wire,product:

1）Employingastandardattachmentplugrated20amperesorless;

2）Intendedtobefastenedinplaceorlocatedinadedicatedspace.

29.2Leakagecurrentreferstoallcurrents,includingcapacitivelycoupledcurrents,thatmaybeconveyedbetweenexposedconductivesurfacesofanapplianceandgroundototherexposedconductivesurfacesofanappliance.

29.3Allexposedconductivesurfacesaretobetestedforleakagecurrents.Theleakagecurrentsfromthesesurfacesaretobemeasuredtothegroundedsupplyconductorindividuallyaswellascollectivelywheresimultaneouslyaccessible.Partsareconsideredtobeexposedsurfacesunlessguardedbyanenclosureconsideredacceptableforreducingtheriskofelectricshockasdefinedin9.1-9.5.Surfacesareconsideredtobesimultaneouslyaccessibleiftheycanbereadilycontactedbyoneorbothhandsofapersonatthesametime.Thesemeasurementsdonotapplytoterminalsoperatingatvoltagesthatarenotconsideredtoinvolveariskofelectricshock.Ifallaccessiblesurfacesarebondedtogetherandconnectedtothegroundingconductorofthepower-supplycord,theleakagecurrentcanbemeasuredbetweenthegroundingconductorandthegroundedsupplyconductor.

29.4Ifaconductivesurfaceotherthanmetalisusedfortheenclosureorpartoftheenclosure,theleakagecurrentistobemeasuredusingmetalfoilhavinganareaof10by20centimeters（3.9by7.9inches）incontactwiththesurface.Ifthesurfacehasanareaoflessthan10by20centimeters（3.9by7.9inches）,themetalfoilistobethesamesizeasthesurface.Themetalfoilisnottoremaininplacelongenoughtoaffectthetemperatureoftheappliance.

29.5ThemeasurementcircuitforleakagecurrentistobeasillustratedinFigure29.1.Themeasurementinstrumentisdefinedin（a）–（d）.Themeterthatisactuallyusedforameasurementneednotonlyindicatethesamenumericalvalueforaparticularmeasurementaswouldthedefinedinstrument.Themeterusedneednothavealltheattributesofthedefinedinstrument:

a）Themeteristohaveaninputimpedanceof1500ohmsresistiveshuntedbyacapacitanceof0.15microfarad.

b）Themeteristoindicate1.11timestheaverageofthefull-waverectifiedcompositewaveformofthevoltageacrosstheresistororcurrentthroughtheresistor.

c）Overafrequencyrangeof0-100kilohertz,themeasurementcircuitryistohaveafrequencyresponse–ratioofindicatedtoactualvalueofcurrent–equaltotheratiooftheimpedanceofa1500-ohmresistorshuntedbya0.15-microfaradcapacitorto1500ohms.Atanindicationof0.5milliampere,themeasurementisnottohaveanerrorofmorethan5percentat60hertz.

d）Unlessthemeterisbeingusedtomeasureleakagefromonepartofanappliancetoanother,themeteristobeconnectedbetweentheaccessiblepartsandthegroundedsupplyconductor.

29.6Asampleoftheapplianceistobetestedforleakagecurrentintheas-receivedcondition,withoutpriorenergizationexceptasmayoccuraspartoftheproductionlinetesting,butwiththegroundingconductor,ifany,openattheattachmentplug.Thesupplyvoltageistobeadjustedtotheapplicablevaluesspecifiedin33.1.8.Thetestsequence,withreferencetothemeasuringcircuit,Figure29.1,istobeasfollows.

a）WiththeswitchS1open,theapplianceistobeconnectedtothemeasuringcircuit.LeakagecurrentistobemeasuredusingbothpositionsofswitchS2,andwiththeapplianceswitchingdevicesinalltheirnormaloperatingpositions.

b）SwitchS1isthentobeclosed,energizingtheappliance,andwithin5seconds,theleakagecurrentistobemeasuredusingbothpositionsofswitchS2andwiththeapplianceswitchingdevicesinalltheirnormaloperatingpositions.

c）Theleakagecurrentistobemonitoreduntilthermalstabilization.BothpositionsofswitchS2aretobeusedindeterminingthismeasurement.Thermalstabilizationistobeobtainedbyoperationasinthenormaltemperaturetest.

29.7Normallythecompleteleakagecurrenttest,asdescribedin29.6,istobeconductedwithoutinterruptionforothertests.However,withtheconcurrenceofthoseconcerned,theleakagecurrenttestmaybeinterruptedtoconductothernondestructivetests.

Figure29.1

Leakagecurrentmeasurementcircuits

30ContinuityofGroundingCircuitTest

30.1Theresistanceshallbenotmorethan0.1ohmbetweenanypointrequiredtobegrounded,asspecifiedin25.1.2,and:

a）Foranapplianceintendedforpermanentelectricalconnection,thepointontheenclosureatwhichthepower-supplysystemwillbeconnected.

b）Foracord-connectedapplianceemployingagroundingconductorinthecord,thepointtowhichthegroundingconductorofthepower-supplycordisconnected.

30.2Theresistancemaybedeterminedbyanyconvenientmethodexceptthatifunacceptableresultsareobtained,eitheradirectoralternatingcurrentequaltothecurrentratingofthemaximum-current-ratedbranch-circuitovercurrent-protectivedevicethatmaybeemployedwiththeapplianceistobepassedfromtheequipmentgroundingterminalorthepointofattachmentofthewiringsystemtothedeadmetalpart,andtheresultingdropinpotentialistobemeasuredbetweenthesetwopoints.Theresistanceinohmsisdeterminedbydividingthedropinpotentialinvoltsbythecurrentinamperespassingbetweenthetwopoints.

31StartingCurrentTest

31.1Whenoperatedasdescribedin31.3,anapplianceshallstartandoperatenormallywithout:

a）Trippinganoverloadprotectorprovidedaspartoftheappliance;

or

b）Openingthefuse,whenconnectedtoacircuitprotectedbyafuseasdescribedin31.2.

31.2Thefusementionedin31.1（b）istobeotherthanatime-delaytype.Thecurrentratingofthefuseistobeequaltothecurrentratingofthesupplycircuitofthelowestratingtowhichtheapplianceisintendedtobeconnected.

Exception:

Atime-delayfusemaybeemployed,providedthattheapplianceismarkedinaccordancewith55.1.2and:

a）Theconstructionoftheapplianceorthenatureofitsusageissuchthatitislikelytobeusedcontinuallyonthesamebranchcircuitafterinstallation–forexample,awindowfan,anatticventilator,orthelike;

b）Theapplianceisofthehouseholdtypethatwouldnormallybeusedona15-or20-amperebranchcircuit.

31.3Todeterminewhetheranappliancecomplieswiththerequirementsin31.1.theapplianceistobeconnectedtoapower-supplycircuitprotectedbyafuseasspecifiedin31.2orintheexceptionto31.2,whicheverapplies.Theapplianceistobeatroomtemperatureatthebeginningofthetest.Theapplianceistobestartedthreetimeswithouttrippinganoverloadprotectorprovidedaspartoftheappliance,oropeningthefuseprotectingthesupplycircuit.Eachstartoftheapplianceistobemadeunderconditionsrepresentingthebeginningofnormaloperation-thebeginningofthenormaloperatingcycleinthecaseofanautomaticappliance.Themotoroftheapplianceistobeallowedtocometofullspeedaftereachstart,andtocometorestbetweensuccessivestarts.

31.4Anapplianceemployingageneralusereceptacleshallbeloadedtothemarkedratingofthereceptacleoutlet.See18.18

32InputTest

32.1Thecurrentinputtoanapplianceshallbenotmorethan110percentoftheratedvaluewhentheapplianceisoperatedunderconditionsofintendedservice,whenconnectedtoapower-supplycircuitofmaximumratedvoltageandratedfrequency.

33TemperatureTest

33.1Allfans

33.1.1Whentestedasdescribedin33.1.3–33.2.2,anapplianceshallnot:

a）Attainconstanttemperaturesatanypointonthefansufficientlyhightocauseariskoffire;

b）Causedeteriorationofanymaterialsemployedintheappliance;

c）Haveconstanttemperaturerisesatspecificpoints（particularlythosesurfacesthatmaybecontactedbytheuserwiththefanoperatingasintended）morethanthosespecifiedinTable33.1.（See33.1.10.）

33.1.2Athermalprotectivedeviceshallnotoperateduringthetemperaturetest.See21.6.

31.1.3Coilandwindingtemperaturesaretobemeasuredbythermocoupleslocatedonexposedsurfaces,exceptthechange-in-resistancemethodmaybeusedforacoilthatisinaccessibleformountingofthermocouples,suchasacoil:

a）Immersedinsealingcompound;

b）Wrappedwiththermalinsulation;

c）Wrappedwithmorethantwolayersofmaterialsuchascotton,paper,orrayonhavingatotalthicknessofmorethan0.8mm（1/32inch）.

Inanalternating-currentmotorhavingaframediameterof177.80mm（7inches）orless,thethermocoupleistobemountedontheintegrally-applied（enamel）insulationofthewindings.

33.1.4ThermocouplesaretoconsistofwiresnotlargerthanNo.24AWG.Whenthermocouple