關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)

RatedvoltageVRatedimpulsevoltageVOvervoltagecategoryIIIIII<=50330500800>50and<=15080015002500>150and<=300150025004000Clause29Clearances,Creepagedistancesandsolidinsulation爬電距離、電氣間隙和絕緣穿通距離

(Table1)關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)Minimumclearance(Table2)RatedimpulsevoltageVMinimumclearancemm3300.55000.58000.515000.525001.540003.060005.580008.0100011.0關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)HowtofindtheminimumclearanceHouseholdapplianceareinovervoltagecategoryIISelecttheratedvoltageUsingthetable1tofindouttheratedimpulsevoltageAccordingtotable2,theminimumclearancecouldbefoundbyratedimpulsevoltageTheclearancesoffourinsulationtypes:BasicinsulationSupplementaryinsulationReinforcedinsulationFunctionalinsulation關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)TheclearanceofbasicinsulationExample1 :WaterkettleRating :220–240V50Hz2500–3000WRatedvoltageVRatedimpulsevoltage(V)OvervoltagecategoryIIIIII<=50330500800>150and<=15080015002500>150and<=300150025004000220–240VUsingcategoryIITheratedimpulsevoltagewas2500V關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)29.1.1clearancesofbasicinsulationRatedimpulsevoltageVMinimumclearancemm3300.55000.58000.515000.525001.540003.060005.580008.0100011.0Theminimumclearancesofbasicinsulationwas1.5mm關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)Specialcomponentsforbasicinsulation

Theterminalsoftubularsheathedheatingelementscounted1mm,ifthemicroenvironmentispollutiondegree1.>1mmTubularsheathedheatingelementPollutiondegree1關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)29.1.2clearanceofsupplementinsulationTheminimumclearanceissameasthebasicinsulationThedistancebetweenenclosureandinternalwire關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)29.1.3clearanceofreinforcedinsulationThereinforcedinsulationusingthenextstepforratedimpulsevoltage.Betweenterminalandplasticenclosure關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)29.1.4clearanceoffunctionalinsulation

BetweenterminalsThefunctionalinsulationisbetweenlivepartsofdifferentpotential關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)PTCHeatingelementHairstraighterPTCheaterHairstraighterassembly關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)DifferenttypesofPTCHeatingelements關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)InternalconstructionofPTCheatingelementTheclearancebetweensurfacesofPTCheatingelementsmaybereducedto1mmTheclearance>=1mmKaptonfilmPTCheatingplateElectrodeplate關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)29.2creepagedistancesStep1(Tofindoutthepollutiondegree)Pollutiondegree2appliesunlessPrecautionshavebeentakentoprotecttheinsulation,inwhichcasepollution1appliesTheinsulationissubjectedtoconductivepollution,inwhichcasepollutiondegree3appliesNote:Thepollutiondegreeshouldneedrefertopart2.關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)StandardPollutiondegree60335–2–3II60335–2–9III60335–2–14III60335–2–15III60335–2–23II60335–2–80IIIPollutiondegreeclassification關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)Trackingindex(CTI)valuesMaterialgroupI:600<=CTIMaterialgroupII:400<=CTIMaterialgroupIIIa:175<=CTI<400MaterialgroupIIIb:100<=CTI<175Step2(Tofindoutthematerialgroup)

Trackingindextester關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)Trackingindex(CTI)values關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)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關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)ThecreepageofbasicinsulationExample1:WaterkettleRating:220–240V50Hz2500–3000WPollutiondegree3(refertostandard60335–2–15)Themicroenvironmentispollutiondegree3iftheinsulationcanbe pollutedbycondensationfromsteamproducedduringnormaluseof appliance.AssumethematerialgroupisIII(thetightengrade)Workingvoltageisbetween>125and<=250關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)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關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)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關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)InsulationtypeDistanceBasicinsulation4Supplementaryinsulation4Reinforcedinsulation8Functionalinsulation3.2SummaryofMinimumcreepagedistances

關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)29.2.1creepageforbasicinsulation

Lacqueredconductorsofwindings1.5mmCreepagedistanceofwindingneednotbegreaterthantheassociatedclearancespecifiedintable16關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)

Clause29.2.2Asperclause29.2.2,thecreepagedistanceofsupplementaryinsulationshallnotlessthanand2.5mm.Theinternalwireofmicro-switchwasnotsecurelyfixedthatitwaspossibletobetouchedbytestfingerwith2Nforce.Thecreepagedistanceweremeasuredas0mmInternalwireshallbeaccess關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)Clause29.2.3

Thecreepagedistancesofreinforcedinsulationshallnotlessthan8mm.Asresult,thecreepagedistancewasmeasured7.5mmbetweenleadsofneonlampandthelampcoverjoint.

LeadsofneonlampLensEnclosureLeonlampleads2mm3mm2.5mThecreepagedistances=2.5+2+3 =7.5mm關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)

29.2.4creepagedistancesoffunctionalinsulationCreepagedistancebetweenMeasuredresultsLimitationSwitchterminals1.5mm2mm1.5mm關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)Clause29.2.4DistancebetweenMeasuredresultsLimitationPCBBetweenPointAandBClearanceCreepageClearanceCreepage2.07mm2.75mm1.5mm2.0mm關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)PCBTrackABBABA關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)29.2.4creepagedistanceforfunctioninsulationCreepagedistancesmaybereducediftheappliancecomplieswithclause19withthefunctionalinsulationshort-circuited.Forexample:ElectroniccomponentElectroniccomponentThetransistorleads<limitationofcreepagedistance關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)LivePartSupplementaryinsulation(1mm)Basicinsulation29.3.1Materialthicknessrequirementforsupplementaryinsulation(1)SupplementaryInsulation關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)LivePartReinforcedinsulation(2mm)29.3.1Materialthicknessrequirementforreinforcedinsulation(1)ReinforcedInsulation關(guān)于爬電距離和空氣間隙的標(biāo)準(zhǔn)LivePart1stlayerinsulation2ndlayerinsulationEachofthelayersshouldwithstandstheelectricstrengthtestforsu