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1、EN60335EN60335关于爬电距离和关于爬电距离和空气间隙的标准资料空气间隙的标准资料Minimumclearance(Table2)Rated impulse voltageVMinimum clearancemm3300.55000.58000.515000.525001.540003.060005.580008.0100011.0HowtofindtheminimumclearanceHouseholdapplianceareinovervoltagecategoryIISelecttheratedvoltageUsingthetable1tofindouttheratedimpu
2、lsevoltageAccordingtotable2,theminimumclearancecouldbefoundbyratedimpulsevoltageTheclearancesoffourinsulationtypes:1.Basicinsulation2.Supplementaryinsulation3.Reinforcedinsulation4.FunctionalinsulationTheclearanceofbasicinsulationExample 1 : Water kettleRating : 220 240V 50Hz 2500 3000WRated voltage
3、VRated impulse voltage (V)Overvoltage categoryIIIIII150 and 150 and 1mmTubular sheathed heating elementPollution degree 129.1.2clearanceofsupplementinsulationTheminimumclearanceissameasthebasicinsulationThe distance between enclosure and internal wire29.1.3clearanceofreinforcedinsulationThe reinforc
4、ed insulation using the next step for rated impulse voltage. Between terminal and plastic enclosure29.1.4clearanceoffunctionalinsulationBetween terminalsThe functional insulation is between live parts of different potentialPTCHeatingelementHairstraighterPTCheaterHair straighter assemblyDifferenttype
5、sofPTCHeatingelementsInternalconstructionofPTCheatingelementThe clearance between surfaces of PTC heating elements may be reduced to 1mmThe clearance =1mmKapton filmPTC heating plateElectrode plate29.2creepagedistancesStep 1 (To find out the pollution degree)Pollution degree 2 applies unlessPrecauti
6、ons have been taken to protect the insulation, in which case pollution 1 appliesThe insulation is subjected to conductive pollution, in which case pollution degree 3 appliesNote: The pollution degree should need refer to part 2. StandardPollution degree60335 2 3II60335 2 9III60335 2 14III60335 2 15
7、III60335 2 23 II60335 2 80 IIIPollutiondegreeclassificationTracking index (CTI) valuesMaterial group I: 600=CTIMaterial group II: 400=CTIMaterial group III a: 175 =CTI 400Material group III b: 100 =CTI175Step 2 (To find out the material group)TrackingindextesterTrackingindex(CTI)valuesMinimumcreepag
8、edistancesforbasicinsulationWorking voltageVCreepage distance mmPollution degree123Material groupMaterial groupIIIIII a/bIIIIII a/b50 and 125 and 250 and 400 and 500 and 125and=250ThecreepageofbasicinsulationWorking voltageVCreepage distance mmPollution degree123Material groupMaterial groupIIIIII a/
9、bIIIIII a/b50 and 125 and 250 and 400 and 500 and = 8001.83.24.56.38.09.010.0Working voltageVCreepage distance mmPollution degree123Material groupMaterial groupIIIIII a/bIIIIII a/b50 and 125 and 250 and 400 and 500 and = 8001.83.24.56.38.09.010.0MinimumcreepagedistancesforfunctionalinsulationInsulat
10、ion typeDistanceBasic insulation4Supplementary insulation4Reinforced insulation8Functional insulation3.2SummaryofMinimumcreepagedistances29.2.1creepageforbasicinsulationLacqueredconductorsofwindings1.5mmCreepage distance of winding need not be greater than the associated clearance specified in table
11、 16Clause29.2.2Asperclause29.2.2,thecreepagedistanceofsupplementaryinsulationshallnotlessthanand2.5mm.Theinternalwireofmicro-switchwasnotsecurelyfixedthatitwaspossibletobetouchedbytestfingerwith2Nforce.Thecreepagedistanceweremeasuredas0mmInternalwireshallbeaccessClause29.2.3Thecreepagedistancesofrei
12、nforcedinsulationshallnotlessthan8mm.Asresult,thecreepagedistancewasmeasured7.5mmbetweenleadsofneonlampandthelampcoverjoint.LeadsofneonlampLensEnclosureLeonlampleads2mm3mm2.5mThecreepagedistances=2.5+2+3=7.5mm29.2.4creepagedistancesoffunctionalinsulationCreepage distance betweenMeasured resultsLimit
13、ationSwitch terminals1.5mm2mm1.5mmClause29.2.4Distance betweenMeasured resultsLimitationPCBBetween Point A and BClearanceCreepageClearanceCreepage2.07mm2.75mm1.5mm2.0mmPCBTrackABBABA29.2.4creepagedistanceforfunctioninsulationCreepagedistancesmaybereducediftheappliancecomplieswithclause19withthefunct
14、ionalinsulationshort-circuited.Forexample:ElectroniccomponentElectroniccomponentThetransistorleadslimitationofcreepagedistanceLivePartSupplementaryinsulation(1mm)Basicinsulation29.3.1Materialthicknessrequirementforsupplementaryinsulation(1)SupplementaryInsulationLivePartReinforcedinsulation(2mm)29.3
15、.1Materialthicknessrequirementforreinforcedinsulation(1)ReinforcedInsulationLivePart1stlayerinsulation2ndlayerinsulationEachofthelayersshouldwithstandstheelectricstrengthtestforsupplementaryinsulation29.3.2Materialrequirementforsupplementaryinsulation(2)Basicinsulation29.3.2Materialrequirementforrei
16、nforcedinsulation(2)LivePart1stlayerinsulation2ndlayerinsulation3rdlayerinsulationAnytwolayerstogethershouldwithstandstheelectricstrengthtestforreinforcedinsulation= 1mmCase2ClearanceCreepage distance1mmCase3ClearanceCreepage distancePath under consideration includes a V shaped groove with internal angle of less than 80and with a width greater than 1mmCase4ClearanceCreepage distanceCase5ClearanceCreepage distance1mm结束结束
