1ty|tyPty aty
g e
SOLUTION AND ANSWER GUIDE TO THE NATIONA
ty ty ty ty ty ty
L ELECTRICAL CODE 9TH EDITION BY CHARLES
ty ty ty ty ty ty ty
R. MILLER CHAPTER 1-
ty ty ty
19 FULL MANUAL WITH VERIFIED SOLUTIONS
ty ty ty ty ty
MILLER/SANDEFUR,TYILLUSTRATEDT Y GUIDETYTOT Y THETYNEC®,TY21E,TY©2024,TY978035
7766712;TYUNITT Y 1:TYINTRODUCTIONTYTOTYTHET Y NATIONALT Y ELECTRICALT Y CODE®
TABLETYOFTYCONTENTS
Unitt y 1t y Competencyt y Test ............................................................................................................ 1
UNIT1COMPETENCYT Y TEST
1. ThetyNationaltyFiretyProtectiontyAssociationtyhastyactedtyastysponsortyoftythe
NationaltyElectricaltyCodetysince .
a. NEC®Reference:tyPagety 1
b. Answer:1911
2. InformativetyAnnexty
providestyatylisttyoftyproductsafetystandardstyus
edtyfortyproducttylistingtywheretythattylistingtyistyrequiredtybytythetyNEC.
a. NEC®Reference:InformativeAnnexA
b. Answer:A
3. Whichtychapterst y intythetyNECtyapplytygenerallytytotyalltyinstallations?
a. NEC®Reference:ty90.3
b. Answer:tyChaptersty1,ty2,ty3,tyandty 4
4. Everytythreetyyears,tythetyNationaltyElectricaltyCodetyistyrevised,tybuttythetyCodetyhastyonlyty
beentyontyatythree-tyyeartyrevisiontycycletysincety .
a. NEC®Reference:tyPagety 1
b. Answer:1975
5. ThetypurposetyoftythetyNationaltyElectricaltyCodetyistythetypracticaltysafeguardingtyofty
ty fromtyhazardstyarisingtyfromtythetyusetyoftyelectricity.
a. NEC®Reference:personsandt y property
b. Answer:90.2(A)
6. ThetyoriginaltyCodetydocumenttywastydevelopedty
intyastyaresulttyoftyth
etyunitedtyeffortstyoftyvarioustyinsurance,tyelectrical,tyarchitectural,tyandtyalliedtyint
erests.
a. NEC®Reference:tyPagety 1
b. Answer:1897
,2ty|tyPty aty
g e
7. Informativetyannexesty aretynotty parttyoftythetyrequirementst y oftythetyNECtybuttyaretyincludedt y fo
r
only.
a. NEC®Reference:ty90.3
b. Answer:t y informationaltypurposes
8. Whattycitytywastyhometytotythetyfirsttycentral-
stationtyelectrictygeneratingtyplanttydevelopedtybytyThomastyA.tyEdison
?
a. NEC®Reference:tyPagety 2
b. Answer:tyNewtyYorktyCity
9. Chapterty consiststyoftytablestythattyaretyapplicabletyastyreferenced.
a. NEC®Reference:ty90.3
b. Answer:9
10. Int y thet y NEC,t y ULt y ist y thet y abbreviationt y fort y .
a. NEC®Reference:AnnextyI,tyfootnotetyundertyTabletyI.3
b. Answer:tyUnderwriterstyLaboratories
11. Equipmenttythattyistylisted,tylabeled,tyortyboth,tyortyidentifiedtyfortyatyusetyshalltybetyins
talledtyandtyusedtyintyaccordancetywithtyanyty
includedtyintythetylisting,tylabelin
g,tyortyidentification.
a. NEC®Reference:ty110.3(B)
b. Answer:instructions
,3ty|tyPty aty gty e
Solutionandt y AnswerGuide
MILLER/SANDEFUR,TYILLUSTRATEDT Y GUIDET Y TOT Y THET Y NEC®,TY21E,TY©2024,TY9780
357766712;TYUNITT Y 2:TYDEFINITIONS®
TABLETYOFTYCONTENTS
Unitt y 2t y Competencyt y Test ............................................................................................................ 1
UNIT2COMPETENCYT Y TEST
1. A(n)ty
branchtycircuittysuppliestytwotyortymoretyreceptaclesty
ortyoutletstyfortylightingtyandtyappliances.
a. NEC®Reference:Article100t y (Branch-Circuit,GeneralPurpose)
b. Answer:generalpurpose
2.
istythetylargesttyamounttyoftycurrenttycapabletyoftybeingtydeliveredty
attyatypointtyontythetyelectricaltysystemtyduringtyatyshort-circuittycondition.
a. NEC®Reference:tyArticlety100ty(Fault Current,tyAvailable)
b. Answer:tyAvailabletyfaultcurrent
3. A(n)ty
branchtycircuittyconsiststyoftytwotyortymoretyungroundedty
conductorstyhavingtyatypotentialtydifferencetybetweentythem,tyandtyatygroundedtycond
uctortyhavingtyequaltypotentialtydifferencetybetweentyittyandtyeachtyungroundedtycondu
ctortyoftythetycircuittyandtythattyistyconnectedtytotythetyneutraltyortygroundedtyconductort
yoftythetysystem.
a. NEC®Reference:tymultiwire
b. Answer:tyArticle100ty(Branch-Circuit,Multiwire)
4. Antyintermittenttyoperationtyintywhichtyloadtyconditionstyaretyregularlytyrecurr
enttyistythetydefinitiontyofty .
a. NEC®Reference:Article100(Duty,Periodic)
b. Answer:periodic duty
5. Thety istytheconnectiontybetweentythetygrounded-
circuittyconductortyandtythetyequipmenttygroundingtyconductortyattythetyservice.
a. NEC®Reference:tyArticlety100ty(Bonding Jumper,tyMain)
b. Answer:tymainbondingtyjumper
, 4ty|tyPty aty gt
e
6. A(n)ty
tyistyusedtytotyconnecttythetysystemtygroundedtyconducto
rtyortythetyequipmenttytotyatygroundingtyelectrodetyortytotyatypointtyontythetygroundin
gtyelectrodetysystem.
a. NEC®Reference:Article100ty(GroundingElectrodeConductor)
b. Answer:grounding electrodetyconductor
7. Rainproof,tyraintight,tyortywatertighttyequipmenttycantyfulfilltythetyrequirementstyfor
tywheretyvaryingtyweathertyconditionstyothertythantywetne
ss,tysuchtyastysnow,tyice,tydust,tyortytemperaturetyextremes,tyaretynottyatyfactor.
a. NEC®Reference:tyArticlety100t y (Weatherproof:tyInformationaltyNote)
b. Answer:weatherproof
8. A(n)ty t y istyantyintentionallytyconstructed,tylow-
impedancetyelectricallytyconductivetypathtydesignedtyandtyintendedtytotycarrytycurrenttydur
ingtyground-
faulttyeventstyfromtythetypointtyoftyatygroundtyfaulttyontyatywiringtysystemtytotythetyelectrical
tysupplytysourcetyandtythattyfacilitatestythetyoperationtyoftythetyovercurrenttyprotectivetydevi
cetyortyground-tyfaulttydetectors.
a. NEC®Reference:tyArticlety100ty(GroundFault Current Path,tyEffective)
b. Answer:tyeffectiveground-faulttycurrenttypath
9. A(n)ty
tyistyatymanual,tynonautomatic,tyortyautomatictyoperatedtydevicety
usedtyintyconjunctiontywithtyatytransfertyswitchtytotyprovidetyatymeanstyoftydirectlytyconnecti
ngtyloadtyconductorstytotyatypowertysourcetyandtyoftydisconnectingtythetytransfertyswitch.
a. NEC®Reference:tyArticle100t y (TransferSwitch,Bypassty Isolation)
b. Answer:bypasstyisolationt y transfertyswitch
10. Atysurface,tyflush,tyortyfreestandingtyassemblagetywithtyatyraceway,tyfittings,tyorty
othertyenclosuretyprovidedtywithtyonetyortymoretyreceptacles,tyfortythetypurposetyoft
ysupplyingtypowertytotyutilizationtyequipmenttyistycalledtya(n).
a. NEC®Reference:Article100ty(MultioutlettyAssembly)
b. Answer:multioutlett y assembly
11. Atyracewaytyencasedtyinty4tyin.ty(102tymm)tyoftyconcretetyontythetygroundtyfloorty(intydirecttyc
ontacttywithtythetyearth)tyshalltybetyconsideredtya(n)ty tylocation.
a. NEC®Reference:tyArticlety100ty (Location,tyWet)
b. Answer:wet
12. A(n)ty
tymaytyconsisttyoftyonetyortymoretysensingtyelementstyinte
graltywithtythetymotor-compressortyandtyantyexternaltycontroltydevice.
a. NEC®Reference:Article100(ThermalProtector:InformationalNote)
b. Answer:thermalprotector
g e
SOLUTION AND ANSWER GUIDE TO THE NATIONA
ty ty ty ty ty ty
L ELECTRICAL CODE 9TH EDITION BY CHARLES
ty ty ty ty ty ty ty
R. MILLER CHAPTER 1-
ty ty ty
19 FULL MANUAL WITH VERIFIED SOLUTIONS
ty ty ty ty ty
MILLER/SANDEFUR,TYILLUSTRATEDT Y GUIDETYTOT Y THETYNEC®,TY21E,TY©2024,TY978035
7766712;TYUNITT Y 1:TYINTRODUCTIONTYTOTYTHET Y NATIONALT Y ELECTRICALT Y CODE®
TABLETYOFTYCONTENTS
Unitt y 1t y Competencyt y Test ............................................................................................................ 1
UNIT1COMPETENCYT Y TEST
1. ThetyNationaltyFiretyProtectiontyAssociationtyhastyactedtyastysponsortyoftythe
NationaltyElectricaltyCodetysince .
a. NEC®Reference:tyPagety 1
b. Answer:1911
2. InformativetyAnnexty
providestyatylisttyoftyproductsafetystandardstyus
edtyfortyproducttylistingtywheretythattylistingtyistyrequiredtybytythetyNEC.
a. NEC®Reference:InformativeAnnexA
b. Answer:A
3. Whichtychapterst y intythetyNECtyapplytygenerallytytotyalltyinstallations?
a. NEC®Reference:ty90.3
b. Answer:tyChaptersty1,ty2,ty3,tyandty 4
4. Everytythreetyyears,tythetyNationaltyElectricaltyCodetyistyrevised,tybuttythetyCodetyhastyonlyty
beentyontyatythree-tyyeartyrevisiontycycletysincety .
a. NEC®Reference:tyPagety 1
b. Answer:1975
5. ThetypurposetyoftythetyNationaltyElectricaltyCodetyistythetypracticaltysafeguardingtyofty
ty fromtyhazardstyarisingtyfromtythetyusetyoftyelectricity.
a. NEC®Reference:personsandt y property
b. Answer:90.2(A)
6. ThetyoriginaltyCodetydocumenttywastydevelopedty
intyastyaresulttyoftyth
etyunitedtyeffortstyoftyvarioustyinsurance,tyelectrical,tyarchitectural,tyandtyalliedtyint
erests.
a. NEC®Reference:tyPagety 1
b. Answer:1897
,2ty|tyPty aty
g e
7. Informativetyannexesty aretynotty parttyoftythetyrequirementst y oftythetyNECtybuttyaretyincludedt y fo
r
only.
a. NEC®Reference:ty90.3
b. Answer:t y informationaltypurposes
8. Whattycitytywastyhometytotythetyfirsttycentral-
stationtyelectrictygeneratingtyplanttydevelopedtybytyThomastyA.tyEdison
?
a. NEC®Reference:tyPagety 2
b. Answer:tyNewtyYorktyCity
9. Chapterty consiststyoftytablestythattyaretyapplicabletyastyreferenced.
a. NEC®Reference:ty90.3
b. Answer:9
10. Int y thet y NEC,t y ULt y ist y thet y abbreviationt y fort y .
a. NEC®Reference:AnnextyI,tyfootnotetyundertyTabletyI.3
b. Answer:tyUnderwriterstyLaboratories
11. Equipmenttythattyistylisted,tylabeled,tyortyboth,tyortyidentifiedtyfortyatyusetyshalltybetyins
talledtyandtyusedtyintyaccordancetywithtyanyty
includedtyintythetylisting,tylabelin
g,tyortyidentification.
a. NEC®Reference:ty110.3(B)
b. Answer:instructions
,3ty|tyPty aty gty e
Solutionandt y AnswerGuide
MILLER/SANDEFUR,TYILLUSTRATEDT Y GUIDET Y TOT Y THET Y NEC®,TY21E,TY©2024,TY9780
357766712;TYUNITT Y 2:TYDEFINITIONS®
TABLETYOFTYCONTENTS
Unitt y 2t y Competencyt y Test ............................................................................................................ 1
UNIT2COMPETENCYT Y TEST
1. A(n)ty
branchtycircuittysuppliestytwotyortymoretyreceptaclesty
ortyoutletstyfortylightingtyandtyappliances.
a. NEC®Reference:Article100t y (Branch-Circuit,GeneralPurpose)
b. Answer:generalpurpose
2.
istythetylargesttyamounttyoftycurrenttycapabletyoftybeingtydeliveredty
attyatypointtyontythetyelectricaltysystemtyduringtyatyshort-circuittycondition.
a. NEC®Reference:tyArticlety100ty(Fault Current,tyAvailable)
b. Answer:tyAvailabletyfaultcurrent
3. A(n)ty
branchtycircuittyconsiststyoftytwotyortymoretyungroundedty
conductorstyhavingtyatypotentialtydifferencetybetweentythem,tyandtyatygroundedtycond
uctortyhavingtyequaltypotentialtydifferencetybetweentyittyandtyeachtyungroundedtycondu
ctortyoftythetycircuittyandtythattyistyconnectedtytotythetyneutraltyortygroundedtyconductort
yoftythetysystem.
a. NEC®Reference:tymultiwire
b. Answer:tyArticle100ty(Branch-Circuit,Multiwire)
4. Antyintermittenttyoperationtyintywhichtyloadtyconditionstyaretyregularlytyrecurr
enttyistythetydefinitiontyofty .
a. NEC®Reference:Article100(Duty,Periodic)
b. Answer:periodic duty
5. Thety istytheconnectiontybetweentythetygrounded-
circuittyconductortyandtythetyequipmenttygroundingtyconductortyattythetyservice.
a. NEC®Reference:tyArticlety100ty(Bonding Jumper,tyMain)
b. Answer:tymainbondingtyjumper
, 4ty|tyPty aty gt
e
6. A(n)ty
tyistyusedtytotyconnecttythetysystemtygroundedtyconducto
rtyortythetyequipmenttytotyatygroundingtyelectrodetyortytotyatypointtyontythetygroundin
gtyelectrodetysystem.
a. NEC®Reference:Article100ty(GroundingElectrodeConductor)
b. Answer:grounding electrodetyconductor
7. Rainproof,tyraintight,tyortywatertighttyequipmenttycantyfulfilltythetyrequirementstyfor
tywheretyvaryingtyweathertyconditionstyothertythantywetne
ss,tysuchtyastysnow,tyice,tydust,tyortytemperaturetyextremes,tyaretynottyatyfactor.
a. NEC®Reference:tyArticlety100t y (Weatherproof:tyInformationaltyNote)
b. Answer:weatherproof
8. A(n)ty t y istyantyintentionallytyconstructed,tylow-
impedancetyelectricallytyconductivetypathtydesignedtyandtyintendedtytotycarrytycurrenttydur
ingtyground-
faulttyeventstyfromtythetypointtyoftyatygroundtyfaulttyontyatywiringtysystemtytotythetyelectrical
tysupplytysourcetyandtythattyfacilitatestythetyoperationtyoftythetyovercurrenttyprotectivetydevi
cetyortyground-tyfaulttydetectors.
a. NEC®Reference:tyArticlety100ty(GroundFault Current Path,tyEffective)
b. Answer:tyeffectiveground-faulttycurrenttypath
9. A(n)ty
tyistyatymanual,tynonautomatic,tyortyautomatictyoperatedtydevicety
usedtyintyconjunctiontywithtyatytransfertyswitchtytotyprovidetyatymeanstyoftydirectlytyconnecti
ngtyloadtyconductorstytotyatypowertysourcetyandtyoftydisconnectingtythetytransfertyswitch.
a. NEC®Reference:tyArticle100t y (TransferSwitch,Bypassty Isolation)
b. Answer:bypasstyisolationt y transfertyswitch
10. Atysurface,tyflush,tyortyfreestandingtyassemblagetywithtyatyraceway,tyfittings,tyorty
othertyenclosuretyprovidedtywithtyonetyortymoretyreceptacles,tyfortythetypurposetyoft
ysupplyingtypowertytotyutilizationtyequipmenttyistycalledtya(n).
a. NEC®Reference:Article100ty(MultioutlettyAssembly)
b. Answer:multioutlett y assembly
11. Atyracewaytyencasedtyinty4tyin.ty(102tymm)tyoftyconcretetyontythetygroundtyfloorty(intydirecttyc
ontacttywithtythetyearth)tyshalltybetyconsideredtya(n)ty tylocation.
a. NEC®Reference:tyArticlety100ty (Location,tyWet)
b. Answer:wet
12. A(n)ty
tymaytyconsisttyoftyonetyortymoretysensingtyelementstyinte
graltywithtythetymotor-compressortyandtyantyexternaltycontroltydevice.
a. NEC®Reference:Article100(ThermalProtector:InformationalNote)
b. Answer:thermalprotector