2023年全國碩士研究生考試考研英語一試題真題（含答案詳解+作文范文）_第1頁
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1、Designation:D1049?98(Reapproved2010)StardSpecificationfRubberInsulatingCovers1ThisstardisissuedunderthefixeddesignationD1049thenumberimmediatelyfollowingthedesignationindicatestheyearofiginaladoptioninthecaseofrevisionth

2、eyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.ThisstardhasbeenapprovedfusebyagenciesoftheDepartmentofDefense.1.Scope1.1This

3、specificationcoversacceptancetestingofrubberinsulatingcoversfuseasptableprotectivedevicesfprotectionofwkersfromaccidentalcontactwithliveelectricalconductsapparatuscircuits.Itincludesinsulathoodsdeadendprotectslinehosecon

4、nectscableendcoversmiscellaneouscovers.Theelectricalphysicalchemicalrequirementsofthisspecificationshallapplyalsotoanynewmodifiedstylesofcoversthatmaybedevelopedfspecificpurposes.1.2Threetypesofcoversdifferinginchemicalp

5、hysicalacteristicsareprovidedaredesignatedasTypeInonresistanttoozoneTypeIITypeIIIresistanttoozone.1.3FiveclassesofcoversdifferinginelectricalacteristicsareprovidedaredesignatedasClass0Class1Class2Class3Class4.1.4Fivestyl

6、esofcoversdifferingindesignacteristicsareprovidedaredesignatedasStyleAStyleBStyleCStyleDStyleE.NOTE1—Becauseoftheuserequirementssomecoversaresemirigidothersflexible.Theflexibledevicesshouldremainsuitablyflexiblefapplicat

7、ionremovalthroughnmaltemperaturesof?29to54.5C(?20to130F).1.5Thisstarddoesnotpurpttoaddressallofthesafetyconcernsifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpractic

8、esdeterminetheapplicabilityofregulatylimitationspritouse.See18.2.2.ReferencedDocuments2.1ASTMStards:2D297TestMethodsfRubberProducts—ChemicalAnalysisD412TestMethodsfVulcanizedRubberThermoplasticElastomers—TensionD573TestM

9、ethodfRubber—DeteriationinanAirOven3.Terminology3.1DefinitionsofTermsSpecifictoThisStard:3.1.1breakdown—theelectricaldisgearcoccurringbetweentheelectrodesthroughtheequipmentbeingtested.3.1.2flashover—theelectricaldisgear

10、coccurringbetweenelectrodesoveraroundbutnotthroughtheequipmentbeingtested.3.1.3ozone—averyactivefmofoxygenthatmaybeproducedbyconaarcingultravioletrays.3.1.4ozonecuttingchecking—thecuttingactionproducedbyozoneonrubberunde

11、rmechanicalstressintoaseriesofinterlacingcracks.3.1.5rubber—agenerictermthatincludeselastomerselastomericcompoundsregardlessofigin.3.1.6user—asusedin4.3.1theentityemployingtheactualwker(s)usingtheequipmentifnoseparateemp

12、loyerthentheindividual.3.1.7voltagemaximumuse—theacvoltage(rms)ratingoftheprotectiveequipmentthatdesignatesthemaximumnominaldesignvoltageoftheenergizedsystemthatmaybesafelywked.Thenominaldesignvoltageisequaltothephasetop

13、hasevoltageonmultiphasecircuits.3.1.7.1Discussion—Ifthereisnomultiphaseexposureinasystemareathevoltageexposureislimitedtophase1ThisspecificationisunderthejurisdictionofASTMCommitteeF18onElectricalProtectiveEquipmentfWker

14、sisthedirectresponsibilityofSubcommitteeF18.25onInsulatingCoverUpEquipment.ThisstardreplacesANSIStardJ6.2whichisnolongeravailable.CurrenteditionapprovedOct.12010.PublishedNovember2010.iginallypublishedin1949asD1049–49T.L

15、astpreviouseditionapprovedin2002asD1049–98(2002)1.DOI:10.1520D104998R10.2FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSumma

16、rypageontheASTMwebsite.Copyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates19.ElectricalRequirements9.1EachcoverwhenedinaccdancewithSection13shallwithstthe60Hzacprooftestvoltage(rm

17、svalue)thedcprooftestvoltage(averagevalue)specifiedinTable2Table3.TheprooftestshallbeperfmedinaccdancewithSection18shallbeappliedcontinuouslyf3min.9.2TypeIITypeIIIcoversshallshownovisibleeffectsfromconaozonewhentestedina

18、ccdancewith18.5.TABLE3Covers—TypeIITypeIIISpecificationsInsulatHoods—StyleAItemNumberATypeInsulatInsulatDiameterin.InsulatHeightin.HoseSizein.Lengthmm(in.)minHeightmm(in.)minTensileMPa(psi)minClassacProofTestVoltageVdcPr

19、oofTestVoltageVSuggestedElectrodeGroup1pin441375(14.75)159(6.25)4.82(700)220000300002–32pin651406(16.0)159(6.25)4.82(700)220000300002–33pin7611?4–11?2406(16.0(wide))162(6.375)4.82(700)2330000400002–34pin101221?2483(19.0)

20、406(16.0)6.89(1000)440000600002–35pin11611?2267(10.5(ID))165(6.5)4.82(700)330000400002–36pin83?453?411?2–21?2381(15.0)216(8.5)6.89(1000)440000600002–37post6.583?411?2–21?2317(12.5)298(11.75)6.89(1000)330000400002–38post6

21、.51311?2–21?2317(12.5)400(15.75)6.89(1000)440000600002–3DeadEndProtects—StyleBItemNumberATypeInsulatInsulatDiameterHoseSizein.SleeveLengthmmin.TensileMPa(psi)minClassacProofTestVoltageVdcProofTestVoltageVSuggestedElectro

22、deGroup1diskdeadend41?4anysize(adapters)254(10.0)4.82(700)2330000400002–32diskdeadend41?4anysize(adapters)457(18.0)4.82(700)2330000400002–33diskdeadend61457(18.0)4.82(700)220000300002–34diskdeadend41?411?2–21?2940(37.0)4

23、.82(700)440000500002–35diskdeadend711?2–21?2624(24.5)11.0(1600)440000500002–36diskdeadend1011?2–21?2624(24.5)11.0(1600)440000500002–3LineHoseConnects—StyleCItemNumberAHoseSizein.Lengthmm(in.)TensileMPa(psi)minClassacProo

24、fTestVoltageVdcProofTestVoltageVSuggestedElectrodeGroup11305(12.0)4.82(700)220000300002–3211?4305(12.0)4.82(700)220000300002–3311?2305(12.0)4.82(700)330000400002–3TABLE2Covers—TypeISpecificationsInsulatHoods—StyleAItemNu

25、mberATypeInsulatInsulatDiameterin.HoseSizein.Lengthmm(in.)minHeightmm(in.)minTensileMPa(psi)minClassacProofTestVoltageVdcProofTestVoltageVSuggestedElectrodeGroupB1pin41375(14.75)159(6.25)11.0(1600)2200003000022pin61406(1

26、6.0)159(6.25)11.0(1600)2200003000023pin711?411?2406(16.0)162(6.375)11.0(1600)2330000400002DeadEndProtects—StyleBItemNumberATypeInsulatInsulatDiameterin.HoseSizein.InsideDiametermm(in.)SleeveLengthmm(in.)TensileMPa(psi)mi

27、nClassacProofTestVoltageVdcProofTestVoltageVSuggestedElectrodeGroupB1diskdeadend41?4anysize(adapters)121(4.75)254(10)11.0(1600)22000030000222disk2deadend41?4anysize(adapters)121(4.75)457(18)11.0(1600)2200003000023diskdea

28、dend61165(6.5)457(18)11.0(1600)220000300002LineHoseConnects—StyleCItemNumberAHoseSizein.Lengthmm(in.)TensileMPa(psi)minClassacProofTestVoltageVdcProofTestVoltageVSuggestedElectrodeGroupB11305(12.0)11.0(1600)2200003000022

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