UL 141421.docx

UL 141421.docx

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UL141421

June11994

1

UL1414

Standardfor

Across-the-line,Antenna-CouplingandLine-by-pass

CapacitorsforRadio-andTelevision–TypeAppliances

FifhEdition

ApprovalasanAmericanNationalStandard（ANSI）coversthenumberedparagraphsonpagesdatedJune11994.ThesepagesshouldnotbediscardedwhenrevisedoradditionalpagesareissuedifitisdesiredtoretaintheANSIapprovedtext.

AneffectivedateincludedasanoteimmediatelyfollowingcertainrequirementsisoneestablishedbyUL

ApprovedasANSI/UL14141978,July171978

ApprovedasANSI/UL14141983,March17,1983

ApprovedasANSI/UL14141988,October6,1988

ApprovedasANSI/UL1414-1994February14,1994

Revisionsofthisstandardwillbemadebyissuedrevisedoradditionalpagesbearingtheirdateofissue.AULStandardiscurrentonlyifitincorporatesthemostrecentlyadoptedrevision,allofwhichareitemizedonthetransmittalnoticethataccompaniesthelatestpublishedsetofrevisionpages

ISBN1-55989-570-5

Copyright1975¬1994UNDERWRITERSLABORTORIESINC.

CONTENTS

FOREWORD

INTRODUCTION

1SCOPE……………5

2Terminology………5

3Glossary……………5

4Reference………….5

5UnitsofMeasurement……..5

CONSTRUCTION

6Enclosure…………….6

7Sleeving,Tape,Tublingandwireinsulation…………6

8Spacings………………6

PERFORMANCE

ALLCAPACITORS

9CapacitorFlammabilityTest…………………….8

10DielectricVoltage-withstandTest…………….8

ANTENNA-COUPLINGCAPACITOR

11General……………9

ACROSS-THE-LINECAPACITOR

12General……………9

13Dischargetest…….9

14Lifetest…………..13

LINE-BY-PASSCAPACITOR

15General…………….14

16Dischargetest………14

17Lifetest……………..16

DOUBLE-PROTECTIONCAPACITORS

18General…………….16

19Across-the-linedischargetest…………16

20Across-the-linelifetest………………..17

21Antenna-couplingdischargetest………18

22Antenna-couplinglifetest……………….19

MANUFACTURINGANDPRODUCTIONTESTS

23DielectricVoltage-withstand…………….19

24Capacitymeasurement………................22

MARKING

25Details…………….22

FOREWORD

A.ThisstandardcontainsbasicrequirementsforproductscoveredbyULunderitsFollow-Upserviceforthiscategorywiththelimitationsgivenbelowandinthescopesectionofthisstandard.Theserequirementsarebaseduponsoundengineeringprinciples,research,recordsoftestandfieldexperience,andanappreciationoftheproblemsofmanufacture,installation,andusederivedfromconsultationwithandinformationobtainedfrommanufactures,users,inspectionauthorities,andotherhavingspecializedexperience.Theyaresubjecttorevisionasfurtherexperienceandinvestigationmayshowisnecessaryordesirable.

B.TheobservanceoftherequirementsofthisStandardbyamanufacturerisoneoftheconditionofthecontinuedcoverageofthemanufacturer’sproduct.

C.AproductwhichcomplieswiththetextofthisStandardwillnotnecessarybejudgedtocomplywiththeStandardif,whenexaminedandtested,itisfoundtohaveotherfeatureswhichimpairthelevelofsafetycontemplatedbytheserequirements.

D.Aproductemployingmaterialsorhavingformsofconstructiondifferingfromthosedetailedintherequirementofthisstandardmaybeexaminedandtestedaccordingtotheintentoftherequirementand,iffoundtobesubstantiallyequivalent,maybejudgedtocomplywiththeStandard.

E.UL.Inperformingitsfunctionsinaccordancewithitsobjectives,doesnotassumeorundertaketodischargeanyresponsibilityofthemanufactureroranyotherparty.TheopinionsandfindingsofULrepresentitsprofessionaljudgmentgivenwithdueconsiderationtothenecessarylimitationsofpracticaloperationandstateoftheartatthetimethestandardisprocesses.ULshallnotberesponsibletoanyonefortheuseoforrelianceuponthisStandardbyanyone.ULshallnotincuranyobligationorliabilityfordamages,includingconsequentialdamages,arisingoutoforinconnectionwiththeuse,interpretationoforrelianceuponthisStandard.

F.ManytestsrequiredbythestandardofULareinherentlyhazardousandadequatesafeguardsforpersonnelandpropertyshallbeemployedinconductingsuchtests.

INTRODUCTION

1Scope

1.1Theserequirementscovercapacitorsratednotmorethan1.0microfarad,85℃250voltages,and60hertzthatareemployedinradio,televisionreceiving,andsimilarappliancecircuitwherebreakdownofthecapacitormayresultinariskoffire,electicshock,orinjurytopersons.

1.2Theserequirementsalsocoverdoubleprotectioncapacitorsratedmorethan1.0microfarad,85℃,125Voltages,and60hertzthatareemployedinvideo,televisionreceiving,andsimilarappliancecircuitswherebreakdownofthecapacitormayresultinariskoffire,electicshock,orinjurytopersons.

1.3Aproductthatcontainsfeaturescharacteristics,components,materialsorsystemsnewordiffientfromthoseinusewhenthestandardwasdeveloped,andthatinvolvesariskoffireelectricrock,orinjurytopersonshallbeevaluatedusingtheappropriateadditionalcomponentandend-productrequirementsasdeteminednecessarytomaintainthelevelofsafetyfortheuseroftheproductasoriginallyanticipatedbytheintentofthisStandard.

2Terminology

2.1Forthepurposeoftheserequirements,thetermcapacitoralsoreferstocombinationsofcapacitorandresistors.

3Glossary

3.1ACROSS-THE–LINECAPACITOR-Acapacitorthatisconnectedeitheracrossasupplycircuitorbetweenonesideofasupplycircuitandconductivepartthatmaybeconnectedtotheearthground.

3.2Antenna-couplingcapacitor–Acapacitorthatisconnectedfromanantennaterminaltocircuitwithinanappliance.

3.3Double-protectioncapacitor–Acapacitorthatprovidesprotectionagainsttheriskofelectricshockinaccordancewiththerequirementsfordoubleprotectioninthestandardfortelevisionreceiversandhigh-voltagevideoproduce,UL1410.

3.4LINE-BY-PASSCAPACITOR–Acapacitorthatisconnectedbetweenonesideofasupplycircuitandanaccessibleconductivepart.

4references

4.1Anyundatedreferencetoacodeorstandardappearingintherequirementsofthisstandardshallbeinterpretedasreferringtothelatesteditionofthatcodeorstandard

5.Unitsofmeasurement

5.1Ifavalueformeasurementisfollowedbyavalueinotherunitsinparentheses,thesecondvaluemaybeonlyapproximate.Thefirststatevalueistherequirement.

CONSTRUCTION

6Enclosure

6.1Anonmetallicmaterialusedasallorpartoftheenclosureofacapacitorshalleither:

a）Beclassified94V-0asthedeterminedbythetestdescribedinthestandardfor

testforflammabilityofplasticMaterialsforpartsindevicesandappliances,UL94,or

b）Performacceptablywhentestedinaccordancewithcapacitorflammabilitytest,section9.

6.2Amaterialclassified94V-0orbetterusing1/16-inch（1.6mm）thickflat-stocksamplesmaybeusedinlesserthickness

7Sleeving,Tape,TupingandWireinsulation

7.1Sleeving,tape,tubingandwireinsulationshallberatedforthevoltageinvolvedandthetemperatureattainedunderanyconditionofactualuse.Tapeshallbeflame-retardant.Sleeving,tubing,andwireinsulationshallhaveaflameretardantratingVW-1

8Spacings

8.1General

8.1.1Thespacingbetweenuninsulatedlivepartsofoppositepolarity,andbetweenanuninsulatedlivepartandadeadmetalpart,shallnotbelessthantheapplicablevaluespecifiedintable8.1

Table8.1spacings

Capacitorratingvolts

Minimumspacingthroughairandoversurface,inch（mm）

125orless

1/16（1.6）

125to250

1/8（3.2）

8.2Double-protectioncapacitor

8.2.1Thespacingbetweenuninsulatedlivepartsofoppositepolarity,andanuninsulationlivepartandadeadmetalpartshallnotbelessthan1/8inch（3.2mm）oversurfaceorthroughair.

8.2.2Thespacingbetweenuninsulationedlivepartofthesamepolaritybutofadifferentpotentialshallnotbelessthan1/16inch（1.6mm）oversurfaceorthroughair,seefigure8.1.

Figure8.1

Polaritlesindouble-protectioncapacitors

leader

Enlosure

D

C

B

A

Forthepurposeofjudgingspacingsindoule-protectioncapacitors:

a）CapacitorelementsAandDareconsideredtobeatoppositepolarityand

b）CapacitorelementsAandB,CandD,AandC,andBandDareconsideredtobeatdifferentpotientialbutofthesamepolarity.

PERFORMANCE

ALLCAPACITORS

9CapacitorFlammabilityTest

9.1IFanonmetalliccapacitorenclosurematerialisnotclassified94V-0,threesamplesofthecapacitorshallbesubjectedtothree15-secondapplicationsofatestflame,theperiodbetweenapplicationsoftheflamebeing15seconds.Thematerialoftheenclosureisacceptableifeachcapacitordoesnotcontinuetoflameformorethan15secondsafterthefirstandsecondapplications,andfornotmorethan60secondsafterthethirdapplication.

9.2Forthetestrequiredby9.1,asupplyofgashavingheatingvalueofapproximately1000btupercubicfoot（37.6MJ/m3）atnormalpressureand3/8inch（9.5mm）diameterthrillburneraretobeused.Thetestflameistobe3/4inch（19mm）highwithairportsoftheburnerclosed.

9.3Eachcapacitoristobemountedinapositionthatismostconductivetotheignitionofthecapacitorandwhichispermittedbythephysicalcondstructionofthecapacitor.Thetipofthetestflameistobeappliedatanylocationonthebodyofeachcapacitor.

10DielectricVoltage-withstandtest

10.1Asreceivedsamples

10.1.1Tencapacitorsshallwithstandwithoutindicationofunacceptableperformancefor1minuteasinusoidalpotential,havingafrequencyof60hertz,appliedfromleadtolead.Thepotentialshallbe1250voltsrmsforcapacitorsratedupto125volts,and1500Vrmsforcapacitorsrated126~250v