电力安全常识Common sense of electric power safety.docx

电力安全常识Common sense of electric power safety.docx

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电力安全常识Commonsenseofelectricpowersafety

电力安全常识（Commonsenseofelectricpowersafety）

Commonsenseofelectricpowersafety

1,whentheelectricalequipmentfireoccurs,whatkindsofequipmentcanbeelectrifiedfireextinguishing?

Answer:

1211carbondioxide,carbontetrachloridedrypowder（answer2,countright）

2,accordingtothefrequencyofelectricshockaccident,whichmonthoftheyearisthemostconcentratedaccident?

Answer:

6~9months

3.Howmanyvoltsisthemaximumsafetyvoltage?

Answer:

42Volts

4,throughthesafetyofthebody,DCcurrentprovisionsinthefollowing?

Answer:

50mA

5,throughpersonalcommunication,safetycurrentregulationinthefollowing?

Answer:

10mA

6,electricshockemergencyambulancelaw,whatshouldbethefirst?

Andwhatisgoingonrightnow?

Answer:

electricshockrescue;artificialrespiration.

7.Howmanykindsofprotectiondevicesaretheretopreventdirectlightninginourfactory?

Answer:

lightningrod;lightningprotectionnetwork;lightningeliminator.

8,whenthewireisgrounded,thedistancebetweenthebodyandthegroundiscloser.Thehigherthestepvoltageis,thefartherthedistanceis,andthelowerthestepvoltageis.Generally,thedistancebetweenthegroundingbodyandthestepvoltagecanberegardedaszero.A:

10mwithinB:

20motherthanC:

30m

Answer:

B

9,lowvoltagetestpencilisgenerallyapplicabletoACandDCvoltage（V）.

A:

220B:

380C:

500

Answer:

C

10,theconstructionsitelightingfacilitiesshouldbetakentopreventelectricshockmeasures（）.

A:

wearinsulatedglovesB:

cutoffthepowerC:

standontheinsulationboard

Answer:

B

11,theelectricshockcanberescued,thekeyliesin（）

A:

thewaytogetanelectricshockB:

thesizeofthebodyresistance

C:

theleveloftheelectricshockvoltageD:

canyougetoutofthepowerassoonaspossibleandcarryoutemergencymedicalservice?

Answer:

D

12,theeliminationofstaticelectricityonthepipeline,mainlywhattodo?

Answer:

Ground

13.Whatiscalledsafevoltage?

Answer:

indifferentenvironments,humanexposuretothechargedbodyhascertainvoltage,itsvariousparts（suchasskin,heart,dirty,respiratoryandnervoussystem）withoutanydamage,thevoltagecalledsafevoltage.

14,whatarethemainfactorsthataffectthedegreeofinjurytothehumanbody?

Answer:

themainfactorsare:

thesizeofthecurrent,thebodyresistance,thedurationofthepower,thefrequencyofthecurrent,thelevelofvoltage,thecurrentpath,thehumancondition.

15、themotorinoperationwillstartagainafterstopping.Howmanytimescanthethermalstartbeallowedinthehotstate?

Howmanytimesdoyouallowacontinuousstartinacoldcondition?

Answer:

1times;2~3times

16,theconstructionofelectricalmachineryandequipmentshouldbetakenasprotectivemeasures?

Answer:

protectionmustbeusedtoconnectzeroandrepeatground.

17,whatarethetwopartsoftheelectricalsafetymeasures?

Answer:

organizationalmeasuresandtechnicalmeasures.

18、Whatarethemainmethodsofseparatingfromlowvoltagepowersupply?

Answer:

（1）cutoffthepowersupply;

（2）cutoffthepowerline;（3）pullthepowercord;

（4）pulloutelectricshock;（5）takecorrespondingrescuemeasures.

Totaketheabovemeasures,attentionmustbepaidtotheinsulationtoolsaccordingtothecorrespondingvoltagelevel.

19、whatistheorderoftheisolationswitcheswhenthepoweristransmitted?

Answer:

first,afterthebussidelineside.

Switch20,powerdistributionboxcanbeopenedwithaload.

Answer:

No.

21、whatkindofpowertoolsmustbeusedwhenusinghand-heldormobilepowertoolsinexplosiveandfiredangerousplaces?

Answer:

thereareantiexplosionmeasures.

22howmanyvoltsofsafevoltageshouldbeusedinawetworkplaceorinametalcontainerusingportableelectricappliancesorlamps?

Answer:

12V.

23,themotortestmachine,youcanmovetogether,pressthestopbuttonimmediately?

Why?

Answer:

No.Thestartingcurrentis6~7timestheratedcurrent,andtheswitchwillburnoutimmediately.

24,Iplantmostofthemotorsareexplosion-proofmotors,explosion-proofgradeisgenerallywhat?

Answer:

dIIBT4

25,myfactoryexplosion-proofmotor,isnotwaterproofmotor?

Answer:

No.

26,whentheprocessloaddoesnotreachtheratedload,themotorwillnotoverload,right?

Why?

Answer:

No.Mediumchanges,pumpfailure,motorfailurewillleadtoexcessiveload.

27,whydonotfire,temporaryelectricityticketisnotallowedtoconnecttemporaryelectricity?

Answer:

temporarypowerbelongstotheelectricityspark,easytocausesafetyaccidentscausedbyelectricshock,fireexplosion,fire,temporaryelectricitymustapplyfortickets,takesomesecuritymeasuresontheconstructionsite,canconnecttemporaryelectricity.

28,indoorlightinglinesofelectricalequipment,thetotalcapacityofeachcircuitshouldnotexceedkW,

（1）1;

（2）2;（3）3.

Answer:

（2）

29,thesocketcapacityshouldbecompatiblewiththepowerload,eachsocketisallowedtouseafewappliances

Answer:

1

30,workplacerelativehumidityisgreaterthan75%,thenthisworkenvironmentisvulnerabletoelectricshockenvironment:

（1）danger;

（2）particularlydangerous;（3）general

Answer:

（1）

31,inordertopreventaccidentscausedbyelectrostaticsparks,allusedtoprocess,storage,transportationofavarietyofflammablegas,liquid,powderequipment,metalpipes,nonconductivematerialspipemust

（1）thereisalargeenoughresistance;

（2）thereisasmallenoughresistance;（3）grounding

Three

32,powertoolsleadwire,inwhichtheyellowgreendoublecolorlineshouldbeusedasaline.

（1）phase;

（2）workzeroline;（3）protectiveearthing.

Answer:

（3）

33,themosteffectivemeasurestoensurethepersonalsafetyofelectricalmaintenancepersonnelare.

（1）hangingnameplate;

（2）placingbarrier;（3）groundingandshort-circuitofmaintenanceequipment.Answer:

（3）

34,fromthesecuritypointofview,theequipmentoutagemusthaveanobvious--.

（1）sign:

（2）grounding;（3）breakpoint.

Answer:

（3）

35,theequipmentorlinesofconfirmationofnoelectricity,shouldbebasedoninstructions.

（1）thevoltagemeter

（2）;electroscopes;（3）disconnectsignal.

Answer:

（2）

36,distributionpanel（box）,switches,transformersandotherelectricalequipmentmaynotbenear.

（1）setfireextinguishers;

（2）setupfences;

3）pileupinflammable,explosive,dampandotherthingsthataffecttheoperation.

Answer:

（3）

37,generalresidentialbuildings,officespace,ifthemainpurposeofpreventingelectricshock,theuseofleakageactioncurrentofmAleakageprotectionswitch.

（1）6;

（2）15;（3）30.

Answer:

（3）

38,mobilepowertoolsandtheirswitchboard（box）powerlinemustbeadopted.

（1）doubleplasticcoppercoreinsulationwire;

（2）doublestrandedcoppercoreplasticwire;（3）coppercorerubberinsulationorsheathcoppercorePVCinsulatedPVCsheathedflexiblecord.

Answer:

（3）

39,mobilepowertools,powercordleadlengthshouldnotgenerallyexceedmeters.

（1）2;

（2）3;（3）4.

Answer:

（2）

40,long-termuseofhand-heldpowertools,theuseofinsulationresistancemustbemeasured,requiringIclasshand-heldpowertools,livepartsandinsulationresistancebetweentheshellisnotlessthanM.

（1）2;

（2）0.5;（3）1.

Answer;

（2）

41.Whatisashortcircuit?

Answer:

shortcircuitisaphaselineandphaselineintheelectricline,phaselineandthezerolineortheearth,notincollisionbyloadorresistanceisverysmall,resultinginasubstantialincreaseintheelectricalcurrentloopphenomenon.

42,whatharmdoesshortcircuithave?

A:

theshortcircuitcurrentcausestheshortcircuitoreventhewholecircuittooverheat,andtheinsulatinglayerofthewireburnsupandignitesthecombustibleinthesurroundingbuilding.

43,inmovingfan,lightingandmobileweldingmachineandotherelectricalequipment,underwhatcircumstancesshouldbecarriedout?

Answer:

cutoffthepowersupply.

44,anyelectricalequipmentshallbeconsideredincheckwhenthereisnoelectricity,andnotblindtouch.

Answer:

thereiselectricity.

45,1kWiodinetungstentubesurfacetemperatureofuptohowmanydegrees?

Answer:

500~800degreescelsius.

46.Whyisanincandescentlampeasytobreakwhenturningonthelight?

Answer:

filamentcold,smallresistance,justenergized,thecurrentislarge（about10times）,longtime,easytobad.

47,fluorescenttwohairrednotbright,youcancontinuerunning?

Why?

Answer:

No.Atthistimethecurrentisgreaterthantheratedcurrent,willcause

（1）filamentaginganddamagequickly;

（2）ballasttemperatureistoohigh,itwillcausefire.

48,thesamevoltagealternatingcurrentanddirectcurrent,whichoneofthegreatharmtopeople?

Answer:

alternatingcurrent.Especiallythealternatingcurrentof50~60Hz.

49,electricalequipmentfire,firstofall,whatmeasuresmustbetaken?

Answer:

powerfailure.

50,intheproductionprocess,equipmentmaintenancefireshallnotbetemporarywhyinthecabletrenchnear?

Answer:

inordertopreventtheditchmemoryhasflammablegascausedeflagration.

51,whathappensintheoperationofelectricalequipment,theoperatorshouldtakeemergencymeasurestostartthestandbyunit,stopabnormalunits,andnotifytheprofessionalinspectionprocess.

A:

（1）theloadcurrentsuddenlyexceedsthespecifiedvalueorthephaseofthephaseisrecognized;

（2）themotororswitchsuddenlyappearshightemperatureorsmoke;

（3）thefrictionofthemotororotherequipmentduetotheloosenessofcomponentscausesnoiseorsparks;

（4）seriousmechanicalloadfailureorendangerelectricalsafety.