关于爬电距离和空气间隙的标准

RatedvoltageVRatedimpulsevoltageVOvervoltagecategoryIIIIII<=50330500800>50and<=15080015002500>150and<=300150025004000Clause29Clearances,Creepagedistancesandsolidinsulation爬电距离、电气间隙和绝缘穿通距离

(Table1)关于爬电距离和空气间隙的标准Minimumclearance(Table2)RatedimpulsevoltageVMinimumclearancemm3300.55000.58000.515000.525001.540003.060005.580008.0100011.0关于爬电距离和空气间隙的标准HowtofindtheminimumclearanceHouseholdapplianceareinovervoltagecategoryIISelecttheratedvoltageUsingthetable1tofindouttheratedimpulsevoltageAccordingtotable2,theminimumclearancecouldbefoundbyratedimpulsevoltageTheclearancesoffourinsulationtypes:BasicinsulationSupplementaryinsulationReinforcedinsulationFunctionalinsulation关于爬电距离和空气间隙的标准TheclearanceofbasicinsulationExample1 :WaterkettleRating :220–240V50Hz2500–3000WRatedvoltageVRatedimpulsevoltage(V)OvervoltagecategoryIIIIII<=50330500800>150and<=15080015002500>150and<=300150025004000220–240VUsingcategoryIITheratedimpulsevoltagewas2500V关于爬电距离和空气间隙的标准29.1.1clearancesofbasicinsulationRatedimpulsevoltageVMinimumclearancemm3300.55000.58000.515000.525001.540003.060005.580008.0100011.0Theminimumclearancesofbasicinsulationwas1.5mm关于爬电距离和空气间隙的标准Specialcomponentsforbasicinsulation

Theterminalsoftubularsheathedheatingelementscounted1mm,ifthemicroenvironmentispollutiondegree1.>1mmTubularsheathedheatingelementPollutiondegree1关于爬电距离和空气间隙的标准29.1.2clearanceofsupplementinsulationTheminimumclearanceissameasthebasicinsulationThedistancebetweenenclosureandinternalwire关于爬电距离和空气间隙的标准29.1.3clearanceofreinforcedinsulationThereinforcedinsulationusingthenextstepforratedimpulsevoltage.Betweenterminalandplasticenclosure关于爬电距离和空气间隙的标准29.1.4clearanceoffunctionalinsulation

BetweenterminalsThefunctionalinsulationisbetweenlivepartsofdifferentpotential关于爬电距离和空气间隙的标准PTCHeatingelementHairstraighterPTCheaterHairstraighterassembly关于爬电距离和空气间隙的标准DifferenttypesofPTCHeatingelements关于爬电距离和空气间隙的标准InternalconstructionofPTCheatingelementTheclearancebetweensurfacesofPTCheatingelementsmaybereducedto1mmTheclearance>=1mmKaptonfilmPTCheatingplateElectrodeplate关于爬电距离和空气间隙的标准29.2creepagedistancesStep1(Tofindoutthepollutiondegree)Pollutiondegree2appliesunlessPrecautionshavebeentakentoprotecttheinsulation,inwhichcasepollution1appliesTheinsulationissubjectedtoconductivepollution,inwhichcasepollutiondegree3appliesNote:Thepollutiondegreeshouldneedrefertopart2.关于爬电距离和空气间隙的标准StandardPollutiondegree60335–2–3II60335–2–9III60335–2–14III60335–2–15III60335–2–23II60335–2–80IIIPollutiondegreeclassification关于爬电距离和空气间隙的标准Trackingindex(CTI)valuesMaterialgroupI:600<=CTIMaterialgroupII:400<=CTIMaterialgroupIIIa:175<=CTI<400MaterialgroupIIIb:100<=CTI<175Step2(Tofindoutthematerialgroup)

Trackingindextester关于爬电距离和空气间隙的标准Trackingindex(CTI)values关于爬电距离和空气间隙的标准MinimumcreepagedistancesforbasicinsulationWorkingvoltageVCreepagedistancemmPollutiondegree123MaterialgroupMaterialgroupIIIIIIa/bIIIIIIa/b<=500.20.60.91.21.51.71.9ª>50and<=1250.30.81.11.51.92.12.4>125and<=2501.61.31.82.53.23.64.0>250and<=4001.02.02.84.05.05.66.3>400and<=5001.32.53.65.06.37.18.0>500and<=8001.83.24.56.38.09.010.0关于爬电距离和空气间隙的标准ThecreepageofbasicinsulationExample1:WaterkettleRating:220–240V50Hz2500–3000WPollutiondegree3(refertostandard60335–2–15)Themicroenvironmentispollutiondegree3iftheinsulationcanbe pollutedbycondensationfromsteamproducedduringnormaluseof appliance.AssumethematerialgroupisIII(thetightengrade)Workingvoltageisbetween>125and<=250关于爬电距离和空气间隙的标准ThecreepageofbasicinsulationWorkingvoltageVCreepagedistancemmPollutiondegree123MaterialgroupMaterialgroupIIIIIIa/bIIIIIIa/b<=500.20.60.91.21.51.71.9ª>50and<=1250.30.81.11.51.92.12.4>125and<=2501.61.31.82.53.23.64.0>250and<=4001.02.02.84.05.05.66.3>400and<=5001.32.53.65.06.37.18.0>500and<=8001.83.24.56.38.09.010.0关于爬电距离和空气间隙的标准WorkingvoltageVCreepagedistancemmPollutiondegree123MaterialgroupMaterialgroupIIIIIIa/bIIIIIIa/b<=500.20.60.81.11.41.61.8ª>50and<=1250.30.71.01.41.82.02.2>125and<=2500.41.01.42.02.52.83.2>250and<=4000.81.62.23.24.04.55.0>400and<=5001.02.02.84.05.05.66.3>500and<=8001.83.24.56.38.09.010.0Minimumcreepagedistancesforfunctionalinsulation关于爬电距离和空气间隙的标准InsulationtypeDistanceBasicinsulation4Supplementaryinsulation4Reinforcedinsulation8Functionalinsulation3.2SummaryofMinimumcreepagedistances

关于爬电距离和空气间隙的标准29.2.1creepageforbasicinsulation

Lacqueredconductorsofwindings1.5mmCreepagedistanceofwindingneednotbegreaterthantheassociatedclearancespecifiedintable16关于爬电距离和空气间隙的标准

Clause29.2.2Asperclause29.2.2,thecreepagedistanceofsupplementaryinsulationshallnotlessthanand2.5mm.Theinternalwireofmicro-switchwasnotsecurelyfixedthatitwaspossibletobetouchedbytestfingerwith2Nforce.Thecreepagedistanceweremeasuredas0mmInternalwireshallbeaccess关于爬电距离和空气间隙的标准Clause29.2.3

Thecreepagedistancesofreinforcedinsulationshallnotlessthan8mm.Asresult,thecreepagedistancewasmeasured7.5mmbetweenleadsofneonlampandthelampcoverjoint.

LeadsofneonlampLensEnclosureLeonlampleads2mm3mm2.5mThecreepagedistances=2.5+2+3 =7.5mm关于爬电距离和空气间隙的标准

29.2.4creepagedistancesoffunctionalinsulationCreepagedistancebetweenMeasuredresultsLimitationSwitchterminals1.5mm2mm1.5mm关于爬电距离和空气间隙的标准Clause29.2.4DistancebetweenMeasuredresultsLimitationPCBBetweenPointAandBClearanceCreepageClearanceCreepage2.07mm2.75mm1.5mm2.0mm关于爬电距离和空气间隙的标准PCBTrackABBABA关于爬电距离和空气间隙的标准29.2.4creepagedistanceforfunctioninsulationCreepagedistancesmaybereducediftheappliancecomplieswithclause19withthefunctionalinsulationshort-circuited.Forexample:ElectroniccomponentElectroniccomponentThetransistorleads<limitationofcreepagedistance关于爬电距离和空气间隙的标准LivePartSupplementaryinsulation(1mm)Basicinsulation29.3.1Materialthicknessrequirementforsupplementaryinsulation(1)SupplementaryInsulation关于爬电距离和空气间隙的标准LivePartReinforcedinsulation(2mm)29.3.1Materialthicknessrequirementforreinforcedinsulation(1)ReinforcedInsulation关于爬电距离和空气间隙的标准LivePart1stlayerinsulation2ndlayerinsulationEachofthelayersshouldwithstandstheelectricstrengthtestforsu