作者:标准资料网 时间:2024-05-03 01:54:22   浏览:8365   来源:标准资料网

【英文标准名称】:ULStandardforSafetyFusedPower-CircuitDevicesFourthEdition;ReprintwithRevisionsThroughandIncluding7/29/2003
【原文标准名称】:安全熔断的电力线路装置用UL标准.第4版
【标准号】:UL977-1994
【标准状态】:作废
【国别】:美国
【发布日期】:1994-11-30
【实施或试行日期】:
【发布单位】:美国保险商实验所(US-UL)
【起草单位】:UL
【标准类型】:()
【标准水平】:()
【中文主题词】:压力传动开关;熔断器;电力导线;高电压;启动装置;安全设备;开关;高压;保险盒
【英文主题词】:pressureswitches;fuses;powerlines;highvoltage;trippingdevices;safeguardingplants;switches;highpressure;fuseboxes
【摘要】:1.1Theserequirementscoverfusedpower-circuitdevicestobeemployedinaccordancewiththeNationalElectricalCode.1.2Fusedpower-circuitdevices,ascoveredbytheserequirements,areconsideredtobeeitherboltedpressurecontactswitchesorhigh-pressurebutt-typecontactswitches.1.3Bolted-pressurecontactswitchesaredevicesinwhichtheblade-jawconnectionshaveanadditionalpressureorclampingactionprovidedatbothendsoftheswitchbladeswhenthebladesareinthefullyclosedposition.1.4High-pressurebutt-typecontactswitchesaredeviceshavingbutt-typecontactsandaspring-chargedmechanism.1.5Theserequirementsdonotapplytolow-voltageACpowercircuitprotectorsascoveredbytheStandardforLowVoltageACPowerCircuitProtectorsUsedinEnclosures,ANSI/IEEEC37.29,ortolow-voltageACintegrallyfusedpowercircuitbreakersascoveredbytheStandardforLow-VoltageACPowerCircuitBreakersUsedinEnclosures,ANSI/IEEEC37.13.1.6Fusedpower-circuitdevicesmaybemanuallyorelectricallyoperatedandmayincorporateelectricaltrippingmeans.1.7Anelectricallytrippeddeviceisonewhoseclosingisperformedmanuallyorelectricallybutcontactopeningisperformedbyareleaseenergizedbyaseparatesourceofvoltage.1.8Adevicewithanelectricaloperatorisonewhosecontactclosingandopeningisperformedbyelectricalmeans.1.9Fusedpower-circuitdeviceshavecontinuouscurrentratingsofmorethan600Aandvoltageratingsof600VorlessAC,DC,orboth.DevicesratedACareintendedforuseoncircuitshavingmaximumavailableshort-circuitcurrentsof100,000,150,000,or200,000A(rmssymmetrical).DevicesratedDCareintendedforuseoncircuitshavingmaximumavailableshort-circuitcurrentsof20,000,50,000,100,000,150,000,or200,000ADC.1.9revisedDecember17,19961.10TheserequirementscoverdeviceswithprovisionformountingClassLfusesorClassTfusesratedmorethan600A.1.11Theserequirementscovercomplete,enclosedfusedpower-circuitdevicesinwhichtheswitchisintegralwiththeenclosure;open-typefusedpower-circuitdevicesintendedformountinginotherequipment,suchasswitchboardsorinaseparatelyshippedenclosure;andenclosuresintendedformountingopen-typefusedpower-circuitdevices.1.11revisedDecember17,19961.12Theserequirementsalsocoverelectricallytrippedand/oroperateddevicesthathavebeeninvestigatedtodeterminetheiracceptabilityforground-faultprotectionwhencombinedwithground-faultsensingandrelayingequipmentasfollows:a)SwitchesforusewithClassIground-faultsensingandrelayingequipmentincludingthosedevicesthatarecapableofinterrupting12timestheirratedcurrentorthathaveintegralmeansintendedtopreventdisconnectingatlevelsoffaultcurrentexceedingthecontactinterruptingcapabilityoftheswitch.b)SwitchesforusewithClassIIground-faultsensingandrelayingequipmentarecapableofinterruptingat10timestheirratedcurrentandareforuseinground-faultprotectionsystemswheremeansintendedtopreventdisconnectinglevelsatfaultcurrentexceedingthecontactinterruptingcapabilitiesoftheswitchareincorporatedwithintheground-faultsensingandrelayingequipment.
【中国标准分类号】:K43
【国际标准分类号】:29_120_50
【页数】:86P.;A4
【正文语种】:英语