UL507.docx
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UL507.docx
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UL507
PERFORMANCE–ALLAPPLIANCES
28TestVoltages
28.1Unlessotherwisespecified,productsshallbetestedattheappropriatepotentialindicatedinTable.
28.2foreachtestasdetailedinthedescribingthetest.
Table28.1
TestVoltages
Ratedvoltage
Inputtestvoltage
Temperaturetestvoltage
Bladeignitiontestvoltage
110―120
191―208
210―240
254―277
440―480
550―600
Rated
Rated
Rated
Rated
Rated
Rated
120
208
240
277
480
600
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;and
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;or
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;or
c)Haveconstanttemperaturerisesatspecificpoints(particularlythosesurfacesthatmaybecontactedbytheuserwiththefanoperatingasintended)morethanthosespecifiedinTable33.1.(See33.1.10.)
33.1.2Athermalprotectivedeviceshallnotoperateduringthetemperaturetest.See21.6.
31.1.3Coilandwindingtemperaturesaretobemeasuredbythermocoupleslocatedonexposedsurfaces,exceptthechange-in-resistancemethodmaybeusedforacoilthatisinaccessibleformountingofthermocouples,suchasacoil:
a)Immersedinsealingcompound;
b)Wrappedwiththermalinsulation;or
c)Wrappedwithmorethantwolayersofmaterialsuchascotton,paper,orrayonhavingatotalthicknessofmorethan0.8mm(1/32inch).
Inanalternating-currentmotorhavingaframediameterof177.80mm(7inches)orless,thethermocoupleistobemountedontheintegrally-applied(enamel)insulationofthewindings.
33.1.4ThermocouplesaretoconsistofwiresnotlargerthanNo.24AWG.Whenthermocouple
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