UL 879-2022 Electric Sign Components 电子标志元件（2-2）.pdf

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APRIL22,2022UL879101

3.4.2.5Dielectricvoltagewithstandtest

3.4.2.5.1General

3.4.2.5.1.1Acomponentshallwithstand,withoutdielectricbreakdown,adielectricvoltageapplied

betweenlivepa巾。foppositepolarityandbetweenlivepa同sanddeadmetalpa同STheapplicationofthe

dielectricwithstandvoltageistobeinaccordancewith主生主皇Uand~生L豆jd.Componentswith

voltagesof1000Vandlessaresubjecttotheprocedurein主A主主主Componentswithvoltagesgreater

than1000VaresubjecttotheprocedureinL牟辛皇主

3.4.2.5.1.2Thedielectricvoltage－川ithstandtestistobeconductedusinga500VAorlargercapacity

testingtransformer,theoutputvoltageofwhichisessentiallysinusoidalandcanbevaried.Theapplied

potentialistobeincreasedfromzerountiltherequiredtestlevelisreachedandistobeheldatthatlevel

for1min.Theincreaseintheappliedpotentialistobeatasubsta『itiallyuniformrateandasrapidasis

consistentwithitsvaluebeingcorrectlyindicatedbyavoltmeter.Thetestsaretobeconductedattherated

supplyinputfrequencyoftheproductunlessotherwisenoted.

3.4.2.5.1.3Thedielectricvoltagebetweencurrent-carryingpa叫sandaninsulatingtypematerial

(polymericenclosure,barri町，orthelike)shallbeappliedbetweenmetalfoilcoveringtheoutsideofthe

materialandcurrentcar叩ingpa由．

3.4.2.5.2Dielectricv。ltagewithstand(forproductswithn。。peratingv。ltagesgreaterthan1000

3.4.2.5.2.1Acomponentistobeoperateduntilinaheatedconditionandtheninaheatedcondition,

withstandwithoutbreakdowntheapplicationofa60-Hzessentiallysinusoidalpotentialof:

a)1000Vplustwicethemaximumratedinputvoltageappliedbetweenthepr

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