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【英文标准名称】:StandardTestMethodforSmokeObscurationofInsulatingMaterialsContainedinElectricalorOpticalFiberCablesWhenBurninginaVerticalCableTrayConfiguration
【原文标准名称】:电缆或光缆中绝缘材料在立式电缆槽结构中燃烧时的烟雾遮蔽性标准试验方法
【标准号】:ASTMD5424-2005
【标准状态】:现行
【国别】:
【发布日期】:2005
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D09.21
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:氧消耗;绝缘材料;一氧化碳;有毒气体;二氧化碳;点火;热量计;电绝缘材料;仪器装置;绝缘;燃烧气体;电缆;试验;设计;烟;防火安全;排气系统
【英文主题词】:cable;cabletray;carbondioxide;carbonmonoxide;char;electricalcable;fire;fire-testresponse;flame;heatrelease;heatreleaserate;ignition;opticaldensity;opticalfibercable;oxygenconsumptioncalorimetry;smokeobscuration;smokerelease;smokereleaserate;totalsmokereleased;toxicgases
【摘要】:Thistestmethodprovidesameanstomeasureavarietyoffire-test-responsecharacteristicsassociatedwithsmokeobscurationandresultingfromburningtheelectricalinsulatingmaterialscontainedinelectricaloropticalfibercables.Thespecimensareallowedtoburnfreelyunderwellventilatedconditionsafterignitionbymeansofapropanegasburner.Smokeobscurationquantifiesthevisibilityinfires.Thistestmethodisalsosuitableformeasuringtherateofheatreleaseasanoptionalmeasurement.Therateofheatreleaseoftenservesasanindicationoftheintensityofthefiregenerated.Otheroptionalfire-test-responsecharacteristicsthataremeasurablebythistestmethodareusefultomakedecisionsonfiresafety.Themostimportantgaseouscomponentsofsmokearethecarbonoxides,presentinallfires.Theyaremajorindicatorsofthetoxicityoftheatmosphereandofthecompletenessofcombustionandareoftenusedaspartoffirehazardassessmentcalculationsandtoimprovetheaccuracyofheatreleasemeasurements.Othertoxicgases,whicharespecifictocertainmaterials,arelesscrucialfordeterminingcombustioncompleteness.TestLimitations:5.5.1Thefire-test-responsecharacteristicsmeasuredinthistestmethodarearepresentationofthemannerinwhichthespecimenstestedbehaveundercertainspecificconditions.Donotassumetheyarerepresentativeofagenericfireperformanceofthematerialstestedwhenmadeintocablesoftheconstructionunderconsideration.5.5.2Inparticular,itisunlikelythatthistestmethodisanadequaterepresentationofthefirebehaviorofcablesinconfinedspaces,withoutabundantcirculationofair.5.5.3Thisisanintermediate-scaletest,andthepredictabilityofitsresultstolargescalefireshasnotbeendetermined.Someinformationexiststosuggestthatithasbeenvalidatedagainstsomelarge-scalescenarios.1.1Thisisafire-test-responsestandard.1.2Thistestmethodprovidesameanstomeasurethesmokeobscurationresultingfromburningelectricalinsulatingmaterialscontainedinelectricaloropticalfibercableswhenthecablespecimens,excludingaccessories,aresubjectedtoaspecifiedflamingignitionsourceandburnfreelyunderwellventilatedconditions.1.3Thistestmethodprovidestwodifferentprotocolsforexposingthematerials,whenmadeintocablespecimens,toanignitionsource(approximately20kW),fora20mintestduration.Useittodeterminetheflamepropagationandsmokereleasecharacteristicsofthematerialscontainedinsingleandmulticonductorelectricaloropticalfibercablesdesignedforuseincabletrays.1.4Thistestmethoddoesnotprovideinformationonthefireperformanceofelectricaloropticalfibercablesinfireconditionsotherthantheonesspecificallyusedinthistestmethodnordoesitmeasurethecontributionofthecablestoadevelopingfirecondition.1.5Datadescribingtheburningbehaviorfromignitiontotheendofthetestareobtained.1.6Theproductionoflightobscuringsmokeismeasured.1.7Theburningbehaviorisdocumentedvisually,byphotographicorvideorecordings,orboth.1.8Thetestequipmentissuitableformakingother,optional,measurements,includingtherateofheatreleaseoftheburningspecimen,byanoxygenconsumptiontechniqueandweightloss.1.9Anothersetofoptionalmeasurementsaretheconcentrationsofcertaintoxicgasspeciesinthecombustiongases.1.10ThevaluesstatedinSIunitsaretoberegardedasthestandard(seeIEEE/ASTMSI10).Thisstandardmeasuresanddescribestheresponseofmaterials,products,orassembliestoheatandflameundercontro......
【中国标准分类号】:K10
【国际标准分类号】:13_220_40;29_035_01;29_060_01
【页数】:20P.;A4
【正文语种】:


【英文标准名称】:WirelessFeaturesDescription:PasswordCallAcceptance(PCA)
【原文标准名称】:无线通信特征:口令呼叫接收(PCA)
【标准号】:ANSI/TIA-664-515-B-2007
【标准状态】:现行
【国别】:美国
【发布日期】:2007
【实施或试行日期】:
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:ANSI
【标准类型】:()
【标准水平】:()
【中文主题词】:移动无线电通信系统;无线电工程;电信
【英文主题词】:Features;Mobileradiosystems;Radioengineering;Telecommunications;Wireless
【摘要】:PasswordCallAcceptance(PCA)isacallscreeningfeaturethatallowsasubscribertolimitincomingcallstoonlythosecallingpartieswhoareabletoprovideavalidPCAPassword(i.e.,aseriesofdigits).CallsfrompartieswhocannotprovideavalidPCAPasswordshallbegivencallrefusaltreatmentwhilePCAisactive.PCAprovidesamethodforscreeningincomingcallswhileprovidingaccesstothesubscriberfromacallingpartyusinganyterminalorphone.
【中国标准分类号】:M19
【国际标准分类号】:33_070_50
【页数】:
【正文语种】:英语