MASTER ELECTRICIAN EXAM REVIEW
QUESTIONS AND ANSWERS WITH
SOLUTIONS 2024
branchYcircuitY-
YANSWERYThatYportionYofYaYwiringYsystemYextendingYbeyondYtheYfinalYovercurrentYdeviceYisYcalledYthe:
CalculatedYloadY-
YANSWERYTheYfinalYsumYofYtheYcomputedYloads,YbasedYonYtheYminimumYcodeYrequirements,YisYthe
ResistanceY-YANSWERYAsYcomparedYtoY#10,YaY#8YwireYofYtheYsameYIengthYhasYless:
0.001YinchY-YANSWERYOneYcircularYmilYisYtheYareaYofYaYcircleYwhoseYdiameterYis:
1,000,000YcmY-YANSWERYAYroundYbus-barYoneYinchYinYdiameter,YhasYaYcircularYmilYareaYof:
fourYtimesYasYgreatY-
YANSWERYAYcopperYwireYwithYtwiceYtheYdiameterYofYanotherYwireYhasYaYcurrentYcarryingYcapacity:
10.4Y-YANSWERYTheYspecificYresistanceYofYcopperYwireY@Y20°YCYinYohmsYperYcircularYmilYft.Yis
permitYcurrentYtoYflowY-YANSWERYConductanceYofYanYelectricYcircuitYisYthatYpropertyYthatYwill:
1OYohmsY-YANSWERYTheYequivalentYvalueYofY0.1YmhoYis
directlyYproportionalYtoYitsYlengthY-YANSWERYTheYresistanceYofYcopperYwireYis:
FeederY-
YANSWERYTheYportionYofYaYwiringYsystemYbetweenYaYpointYofYdistributionYandYtheYbranchYcircuitYovercurre
ntYdeviceYis
,lockingY-
YANSWERYGFCIYprotectionYatYaYcarnivalYisYnotYrequiredYforYequipmentYatYcircuitYifYtheYreceptacleYisYofYtheY_
___________type
notYlessYthanY1Y1/4Yin.YfromY-
YANSWERYWhereYcablesYorYnonmetallicYracewaysYareYinstalledYthroughYbored.holesYinYjoists,Yrafters,YorYwo
odYmembers;holesYshallYbeYboredYsoYthatYtheYedgeYofYtheYholeYisYtheYnearestYedgeY-ofYtheYwoodYmember.
locatedYonYaYbalconyYaccessibleYonlyYtoYqualifiedYpersons
locatedYinYaYroomYonlyYaccessibleYto
qualifiedYpersons
elevatedY8YftYorYmoreYaboveYfloorYorYotherYworkingYsurfaceY-
YANSWERYToYguardYliveYpartsYoverY50VYbutYlessYthanY600V,YequipmentYisYpermittedYtoYbe
12FtY-
YANSWERYOverheadYfeederYconductorsYshallYhaveYaYminimumY__________YverticalYclearanceYoverYresiden
tialYpropertyYandYdriveways,YasYwellYasYthoseYcommercialYareasYnotYsubjectYtoYtruckYtraffic,YwhereYtheYvolt
ageYisYlimitedYtoY300Yvolts-to-ground.
36YinchesY-YANSWERYWhereYrearYaccessYisYrequiredYtoYworkYonYde-
energizedYpartsYonYtheYbackYofYenclosedYequipment,YaYminimumYworkingYspaceYofYhorizontallyYshallYbeYpr
ovided.
50'Y-
YANSWERYWhatYisYtheYmaximumYrunYlengthYofYaY18AWGYfixtureYwireYthatYisYtappedYonYtoYaY20YampYbranch
Ycircuit?
powerYsupplyYfailureY-YANSWERYWhenYtheYserviceYdisconnectingYmeansYisYaYpower-
operatedYswitchYorYcircuitYbreaker,YitYshallYbeYableYtoYbeYopenedYbyYhandYinYtheYeventYofYa
2YinYofYconcreteY-
YANSWERYConductorsYareYconsideredYoutsideYaYbuildingsYwhenYtheyYareYburiedYunderYnotYlessYthan
, 8Y-
YANSWERYInYstraightYpull,YtheYlengthYofYtheYboxYshallYnotYbeYlessYthan.Y____timesYtheYtradeYsizeYofYtheYlarg
estYraceway.
18"Y-
YANSWERYAtYleastYoneYreceptacleYoutletYshallYbeYinstalledYwithinYofYtheYtopYofYaYshowYwindowYforYeachY12Y
linearYfeetYmeasuredYhorizontallyYacrossYitsYlength
1000AY-YANSWERYGround-
faultYprotectionYofYequipmentYshallYbeYprovidedYfroYsolidlyYgroundedYwyeYelectricalYservicesYofYmoreYthanY
150Yvolts-to-ground,YbutYnotYexceedingY600VYphase-to..phaseYforYeachYserviceYdisconnectingYmeansYrated
18"Y-YANSWERYReceptacleYoutletsYinYfloorsYshallYnotYbeYcountedYasYpartYofYtheYrequired
numberYofYreceptacleYoutletsYunlessYlocatedYwithinY______YofYtheYwall
50VY-
YANSWERYExposedYliveYpartsYofYmotorsYandYcontrollersYoperatingYatYorYmoreYbetweenYterminalsYshallYbeYg
uardedYagainstYaccidentalYcontactYbyYenclosureYorYbyYlocation
5'Y-
YANSWERYLightingYtrackYshallYnotYbeYinstalledYlessYthan______YaboveYtheYfinishedYfloorYexcept'YwhereYpro
tectedYfromYphysicalYdamageYorYwhereYtheYtrackYoperatesYatYlessYthanY30YVYrms,Yopen-circuitYvoltage
4Y-
YANSWERYEachYgeneralYcareYareaYpatientYbedYlocationYshallYbeYprovidedYwithYaYminimumYof_______recep
tacles,YwhichYcanYbeYsingle,Yduplex,YorYaYcombinationYwithYeachYduplexYcountingYasYtwoYreceptacles
CombinationYRangeYhood/YMicrowave
ovenY-
YANSWERYInYaYDwellingYUnitYwhichYapplianceYisYallowedYtoYhaveYaY24"YcordYwithYattachmentYgroundYplug?
1Y-YANSWERYAtYleast_____Y125YV,YsingleYphase,Y15YAYorY20YA,YduplexYwithYground-
faultYcircuitYinterrupterYreceptacleYshallYbeYprovidedYinYeachYelevatorYmachineYroomYandYelevatorYmachin
eryYspace.
QUESTIONS AND ANSWERS WITH
SOLUTIONS 2024
branchYcircuitY-
YANSWERYThatYportionYofYaYwiringYsystemYextendingYbeyondYtheYfinalYovercurrentYdeviceYisYcalledYthe:
CalculatedYloadY-
YANSWERYTheYfinalYsumYofYtheYcomputedYloads,YbasedYonYtheYminimumYcodeYrequirements,YisYthe
ResistanceY-YANSWERYAsYcomparedYtoY#10,YaY#8YwireYofYtheYsameYIengthYhasYless:
0.001YinchY-YANSWERYOneYcircularYmilYisYtheYareaYofYaYcircleYwhoseYdiameterYis:
1,000,000YcmY-YANSWERYAYroundYbus-barYoneYinchYinYdiameter,YhasYaYcircularYmilYareaYof:
fourYtimesYasYgreatY-
YANSWERYAYcopperYwireYwithYtwiceYtheYdiameterYofYanotherYwireYhasYaYcurrentYcarryingYcapacity:
10.4Y-YANSWERYTheYspecificYresistanceYofYcopperYwireY@Y20°YCYinYohmsYperYcircularYmilYft.Yis
permitYcurrentYtoYflowY-YANSWERYConductanceYofYanYelectricYcircuitYisYthatYpropertyYthatYwill:
1OYohmsY-YANSWERYTheYequivalentYvalueYofY0.1YmhoYis
directlyYproportionalYtoYitsYlengthY-YANSWERYTheYresistanceYofYcopperYwireYis:
FeederY-
YANSWERYTheYportionYofYaYwiringYsystemYbetweenYaYpointYofYdistributionYandYtheYbranchYcircuitYovercurre
ntYdeviceYis
,lockingY-
YANSWERYGFCIYprotectionYatYaYcarnivalYisYnotYrequiredYforYequipmentYatYcircuitYifYtheYreceptacleYisYofYtheY_
___________type
notYlessYthanY1Y1/4Yin.YfromY-
YANSWERYWhereYcablesYorYnonmetallicYracewaysYareYinstalledYthroughYbored.holesYinYjoists,Yrafters,YorYwo
odYmembers;holesYshallYbeYboredYsoYthatYtheYedgeYofYtheYholeYisYtheYnearestYedgeY-ofYtheYwoodYmember.
locatedYonYaYbalconyYaccessibleYonlyYtoYqualifiedYpersons
locatedYinYaYroomYonlyYaccessibleYto
qualifiedYpersons
elevatedY8YftYorYmoreYaboveYfloorYorYotherYworkingYsurfaceY-
YANSWERYToYguardYliveYpartsYoverY50VYbutYlessYthanY600V,YequipmentYisYpermittedYtoYbe
12FtY-
YANSWERYOverheadYfeederYconductorsYshallYhaveYaYminimumY__________YverticalYclearanceYoverYresiden
tialYpropertyYandYdriveways,YasYwellYasYthoseYcommercialYareasYnotYsubjectYtoYtruckYtraffic,YwhereYtheYvolt
ageYisYlimitedYtoY300Yvolts-to-ground.
36YinchesY-YANSWERYWhereYrearYaccessYisYrequiredYtoYworkYonYde-
energizedYpartsYonYtheYbackYofYenclosedYequipment,YaYminimumYworkingYspaceYofYhorizontallyYshallYbeYpr
ovided.
50'Y-
YANSWERYWhatYisYtheYmaximumYrunYlengthYofYaY18AWGYfixtureYwireYthatYisYtappedYonYtoYaY20YampYbranch
Ycircuit?
powerYsupplyYfailureY-YANSWERYWhenYtheYserviceYdisconnectingYmeansYisYaYpower-
operatedYswitchYorYcircuitYbreaker,YitYshallYbeYableYtoYbeYopenedYbyYhandYinYtheYeventYofYa
2YinYofYconcreteY-
YANSWERYConductorsYareYconsideredYoutsideYaYbuildingsYwhenYtheyYareYburiedYunderYnotYlessYthan
, 8Y-
YANSWERYInYstraightYpull,YtheYlengthYofYtheYboxYshallYnotYbeYlessYthan.Y____timesYtheYtradeYsizeYofYtheYlarg
estYraceway.
18"Y-
YANSWERYAtYleastYoneYreceptacleYoutletYshallYbeYinstalledYwithinYofYtheYtopYofYaYshowYwindowYforYeachY12Y
linearYfeetYmeasuredYhorizontallyYacrossYitsYlength
1000AY-YANSWERYGround-
faultYprotectionYofYequipmentYshallYbeYprovidedYfroYsolidlyYgroundedYwyeYelectricalYservicesYofYmoreYthanY
150Yvolts-to-ground,YbutYnotYexceedingY600VYphase-to..phaseYforYeachYserviceYdisconnectingYmeansYrated
18"Y-YANSWERYReceptacleYoutletsYinYfloorsYshallYnotYbeYcountedYasYpartYofYtheYrequired
numberYofYreceptacleYoutletsYunlessYlocatedYwithinY______YofYtheYwall
50VY-
YANSWERYExposedYliveYpartsYofYmotorsYandYcontrollersYoperatingYatYorYmoreYbetweenYterminalsYshallYbeYg
uardedYagainstYaccidentalYcontactYbyYenclosureYorYbyYlocation
5'Y-
YANSWERYLightingYtrackYshallYnotYbeYinstalledYlessYthan______YaboveYtheYfinishedYfloorYexcept'YwhereYpro
tectedYfromYphysicalYdamageYorYwhereYtheYtrackYoperatesYatYlessYthanY30YVYrms,Yopen-circuitYvoltage
4Y-
YANSWERYEachYgeneralYcareYareaYpatientYbedYlocationYshallYbeYprovidedYwithYaYminimumYof_______recep
tacles,YwhichYcanYbeYsingle,Yduplex,YorYaYcombinationYwithYeachYduplexYcountingYasYtwoYreceptacles
CombinationYRangeYhood/YMicrowave
ovenY-
YANSWERYInYaYDwellingYUnitYwhichYapplianceYisYallowedYtoYhaveYaY24"YcordYwithYattachmentYgroundYplug?
1Y-YANSWERYAtYleast_____Y125YV,YsingleYphase,Y15YAYorY20YA,YduplexYwithYground-
faultYcircuitYinterrupterYreceptacleYshallYbeYprovidedYinYeachYelevatorYmachineYroomYandYelevatorYmachin
eryYspace.
