UL 141421.docx
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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
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