179|79P79 a
g e
SOLUTION AND ANSWER GUIDE TO THE NATIONA
79 79 79 79 79 79
L ELECTRICAL CODE 9TH EDITION BY CHARLES
79 79 79 79 79 79 7
R. MILLER CHAPTER 1-
9 79 79 79
19 FULL MANUAL WITH VERIFIED SOLUTIONS
79 79 79 79 79
MILLER/SANDEFUR,79ILLUSTRATED7 9 GUIDE79TO7 9 THE79NEC®,7921E,79©2024,799780357
766712;79UNIT7 9 1:79INTRODUCTION79TO79THE7 9 NATIONAL7 9 ELECTRICAL7 9 CODE®
TABLE79OF79CONTENTS
Unit7 9 17 9 Competency7 9 Test........................................................................................................... 1
UNIT1COMPETENCY7 9 TEST
1. The79National79Fire79Protection79Association79has79acted79as79sponsor79of79the
National79Electrical79Code79since .
a. NEC®Reference:79Page79 1
b. Answer:1911
2. Informative79Annex79
provides79a79list79of79productsafetystandards79u
sed79for79product79listing79where79that79listing79is79required79by79the79NEC.
a. NEC®Reference:InformativeAnnexA
b. Answer:A
3. Which79chapters79 in79the79NEC79apply79generally79to79all79installations?
a. NEC®Reference:7990.3
b. Answer:79Chapters791,792,793,79and79 4
4. Every79three79years,79the79National79Electrical79Code79is79revised,79but79the79Code79has79
only79been79on79a79three-79year79revision79cycle79since79 .
a. NEC®Reference:79Page79 1
b. Answer:1975
5. The79purpose79of79the79National79Electrical79Code79is79the79practical79safeguarding79of79
from79hazards79arising79from79the79use79of79electricity.
79
a. NEC®Reference:personsand7 9 property
b. Answer:90.2(A)
6. The79original79Code79document79was79developed79
in79as79aresult79of79t
he79united79efforts79of79various79insurance,79electrical,79architectural,79and79allied
79interests.
a. NEC®Reference:79Page79 1
b. Answer:1897
,279|79P79 a
g e
7. Informative79annexes79 are79not79 part79of79the79requirements7 9 of79the79NEC79but79are79include
d7 9 for
only.
a. NEC®Reference:7990.3
b. Answer:7 9 informational79purposes
8. What79city79was79home79to79the79first79central-
station79electric79generating79plant79developed79by79Thomas79A.79Edis
on?
a. NEC®Reference:79Page79 2
b. Answer:79New79York79City
9. Chapter79 consists79of79tables79that79are79applicable79as79referenced.
a. NEC®Reference:7990.3
b. Answer:9
10. In7 9 the7 9 NEC,7 9 UL7 9 is7 9 the7 9 abbreviation7 9 for7 9 .
a. NEC®Reference:Annex79I,79footnote79under79Table79I.3
b. Answer:79Underwriters79Laboratories
11. Equipment79that79is79listed,79labeled,79or79both,79or79identified79for79a79use79shall79b
e79installed79and79used79in79accordance79with79any79
included79in79the79listing,79labeli
ng,79or79identification.
a. NEC®Reference:79110.3(B)
b. Answer:instructions
,379|79P79 a79 g79 e
Solutionand7 9 AnswerGuide
MILLER/SANDEFUR,79ILLUSTRATED7 9 GUIDE7 9 TO7 9 THE7 9 NEC®,7921E,79©2024,799780
357766712;79UNIT7 9 2:79DEFINITIONS®
TABLE79OF79CONTENTS
Unit7 9 27 9 Competency7 9 Test........................................................................................................... 1
UNIT2COMPETENCY7 9 TEST
1. A(n)79
branch79circuit79supplies79two79or79more79receptacl
es79or79outlets79for79lighting79and79appliances.
a. NEC®Reference:Article1007 9 (Branch-Circuit,GeneralPurpose)
b. Answer:generalpurpose
2.
is79the79largest79amount79of79current79capable79of79being79deliver
ed79at79a79point79on79the79electrical79system79during79a79short-circuit79condition.
a. NEC®Reference:79Article7910079(Fault Current,79Available)
b. Answer:79Available79faultcurrent
3. A(n)79
branch79circuit79consists79of79two79or79more79ungrounde
d79conductors79having79a79potential79difference79between79them,79and79a79grounded7
9conductor79having79equal79potential79difference79between79it79and79each79unground
ed79conductor79of79the79circuit79and79that79is79connected79to79the79neutral79or79ground
ed79conductor79of79the79system.
a. NEC®Reference:79multiwire
b. Answer:79Article10079(Branch-Circuit,Multiwire)
4. An79intermittent79operation79in79which79load79conditions79are79regularly79rec
urrent79is79the79definition79of79 .
a. NEC®Reference:Article100(Duty,Periodic)
b. Answer:periodic duty
5. The79 is79theconnection79between79the79grounded-
circuit79conductor79and79the79equipment79grounding79conductor79at79the79service.
a. NEC®Reference:79Article7910079(Bonding Jumper,79Main)
b. Answer:79mainbonding79jumper
, 479|79P79 a79
g e
6. A(n)79
79is79used79to79connect79the79system79grounded79condu
ctor79or79the79equipment79to79a79grounding79electrode79or79to79a79point79on79the79gr
ounding79electrode79system.
a. NEC®Reference:Article10079(GroundingElectrodeConductor)
b. Answer:grounding electrode79conductor
7. Rainproof,79raintight,79or79watertight79equipment79can79fulfill79the79requirements79for
79where79varying79weather79conditions79other79than79wet
ness,79such79as79snow,79ice,79dust,79or79temperature79extremes,79are79not79a79fa
ctor.
a. NEC®Reference:79Article7910079 (Weatherproof:79Informational79Note)
b. Answer:weatherproof
8. A(n)79 7 9 is79an79intentionally79constructed,79low-
impedance79electrically79conductive79path79designed79and79intended79to79carry79current79
during79ground-
fault79events79from79the79point79of79a79ground79fault79on79a79wiring79system79to79the79elec
trical79supply79source79and79that79facilitates79the79operation79of79the79overcurrent79protect
ive79device79or79ground-79fault79detectors.
a. NEC®Reference:79Article7910079(GroundFault Current Path,79Effective)
b. Answer:79effectiveground-fault79current79path
9. A(n)79
is79a79manual,79nonautomatic,79or79automatic79operated79devic
79
e79used79in79conjunction79with79a79transfer79switch79to79provide79a79means79of79directly79co
nnecting79load79conductors79to79a79power79source79and79of79disconnecting79the79transfer79s
witch.
a. NEC®Reference:79Article1007 9 (TransferSwitch,Bypass79 Isolation)
b. Answer:bypass79isolation7 9 transfer79switch
10. A79surface,79flush,79or79freestanding79assemblage79with79a79raceway,79fittings,79
or79other79enclosure79provided79with79one79or79more79receptacles,79for79the79purp
ose79of79supplying79power79to79utilization79equipment79is79called79a(n).
a. NEC®Reference:Article10079(Multioutlet79Assembly)
b. Answer:multioutlet7 9 assembly
11. A79raceway79encased79in79479in.79(10279mm)79of79concrete79on79the79ground79floor79(in79dir
ect79contact79with79the79earth)79shall79be79considered79a(n)7979location.
a. NEC®Reference:79Article7910079(Location,79Wet)
b. Answer:wet
12. A(n)79
79may79consist79of79one79or79more79sensing79elements79in
tegral79with79the79motor-compressor79and79an79external79control79device.
a. NEC®Reference:Article100(ThermalProtector:InformationalNote)
b. Answer:thermalprotector
g e
SOLUTION AND ANSWER GUIDE TO THE NATIONA
79 79 79 79 79 79
L ELECTRICAL CODE 9TH EDITION BY CHARLES
79 79 79 79 79 79 7
R. MILLER CHAPTER 1-
9 79 79 79
19 FULL MANUAL WITH VERIFIED SOLUTIONS
79 79 79 79 79
MILLER/SANDEFUR,79ILLUSTRATED7 9 GUIDE79TO7 9 THE79NEC®,7921E,79©2024,799780357
766712;79UNIT7 9 1:79INTRODUCTION79TO79THE7 9 NATIONAL7 9 ELECTRICAL7 9 CODE®
TABLE79OF79CONTENTS
Unit7 9 17 9 Competency7 9 Test........................................................................................................... 1
UNIT1COMPETENCY7 9 TEST
1. The79National79Fire79Protection79Association79has79acted79as79sponsor79of79the
National79Electrical79Code79since .
a. NEC®Reference:79Page79 1
b. Answer:1911
2. Informative79Annex79
provides79a79list79of79productsafetystandards79u
sed79for79product79listing79where79that79listing79is79required79by79the79NEC.
a. NEC®Reference:InformativeAnnexA
b. Answer:A
3. Which79chapters79 in79the79NEC79apply79generally79to79all79installations?
a. NEC®Reference:7990.3
b. Answer:79Chapters791,792,793,79and79 4
4. Every79three79years,79the79National79Electrical79Code79is79revised,79but79the79Code79has79
only79been79on79a79three-79year79revision79cycle79since79 .
a. NEC®Reference:79Page79 1
b. Answer:1975
5. The79purpose79of79the79National79Electrical79Code79is79the79practical79safeguarding79of79
from79hazards79arising79from79the79use79of79electricity.
79
a. NEC®Reference:personsand7 9 property
b. Answer:90.2(A)
6. The79original79Code79document79was79developed79
in79as79aresult79of79t
he79united79efforts79of79various79insurance,79electrical,79architectural,79and79allied
79interests.
a. NEC®Reference:79Page79 1
b. Answer:1897
,279|79P79 a
g e
7. Informative79annexes79 are79not79 part79of79the79requirements7 9 of79the79NEC79but79are79include
d7 9 for
only.
a. NEC®Reference:7990.3
b. Answer:7 9 informational79purposes
8. What79city79was79home79to79the79first79central-
station79electric79generating79plant79developed79by79Thomas79A.79Edis
on?
a. NEC®Reference:79Page79 2
b. Answer:79New79York79City
9. Chapter79 consists79of79tables79that79are79applicable79as79referenced.
a. NEC®Reference:7990.3
b. Answer:9
10. In7 9 the7 9 NEC,7 9 UL7 9 is7 9 the7 9 abbreviation7 9 for7 9 .
a. NEC®Reference:Annex79I,79footnote79under79Table79I.3
b. Answer:79Underwriters79Laboratories
11. Equipment79that79is79listed,79labeled,79or79both,79or79identified79for79a79use79shall79b
e79installed79and79used79in79accordance79with79any79
included79in79the79listing,79labeli
ng,79or79identification.
a. NEC®Reference:79110.3(B)
b. Answer:instructions
,379|79P79 a79 g79 e
Solutionand7 9 AnswerGuide
MILLER/SANDEFUR,79ILLUSTRATED7 9 GUIDE7 9 TO7 9 THE7 9 NEC®,7921E,79©2024,799780
357766712;79UNIT7 9 2:79DEFINITIONS®
TABLE79OF79CONTENTS
Unit7 9 27 9 Competency7 9 Test........................................................................................................... 1
UNIT2COMPETENCY7 9 TEST
1. A(n)79
branch79circuit79supplies79two79or79more79receptacl
es79or79outlets79for79lighting79and79appliances.
a. NEC®Reference:Article1007 9 (Branch-Circuit,GeneralPurpose)
b. Answer:generalpurpose
2.
is79the79largest79amount79of79current79capable79of79being79deliver
ed79at79a79point79on79the79electrical79system79during79a79short-circuit79condition.
a. NEC®Reference:79Article7910079(Fault Current,79Available)
b. Answer:79Available79faultcurrent
3. A(n)79
branch79circuit79consists79of79two79or79more79ungrounde
d79conductors79having79a79potential79difference79between79them,79and79a79grounded7
9conductor79having79equal79potential79difference79between79it79and79each79unground
ed79conductor79of79the79circuit79and79that79is79connected79to79the79neutral79or79ground
ed79conductor79of79the79system.
a. NEC®Reference:79multiwire
b. Answer:79Article10079(Branch-Circuit,Multiwire)
4. An79intermittent79operation79in79which79load79conditions79are79regularly79rec
urrent79is79the79definition79of79 .
a. NEC®Reference:Article100(Duty,Periodic)
b. Answer:periodic duty
5. The79 is79theconnection79between79the79grounded-
circuit79conductor79and79the79equipment79grounding79conductor79at79the79service.
a. NEC®Reference:79Article7910079(Bonding Jumper,79Main)
b. Answer:79mainbonding79jumper
, 479|79P79 a79
g e
6. A(n)79
79is79used79to79connect79the79system79grounded79condu
ctor79or79the79equipment79to79a79grounding79electrode79or79to79a79point79on79the79gr
ounding79electrode79system.
a. NEC®Reference:Article10079(GroundingElectrodeConductor)
b. Answer:grounding electrode79conductor
7. Rainproof,79raintight,79or79watertight79equipment79can79fulfill79the79requirements79for
79where79varying79weather79conditions79other79than79wet
ness,79such79as79snow,79ice,79dust,79or79temperature79extremes,79are79not79a79fa
ctor.
a. NEC®Reference:79Article7910079 (Weatherproof:79Informational79Note)
b. Answer:weatherproof
8. A(n)79 7 9 is79an79intentionally79constructed,79low-
impedance79electrically79conductive79path79designed79and79intended79to79carry79current79
during79ground-
fault79events79from79the79point79of79a79ground79fault79on79a79wiring79system79to79the79elec
trical79supply79source79and79that79facilitates79the79operation79of79the79overcurrent79protect
ive79device79or79ground-79fault79detectors.
a. NEC®Reference:79Article7910079(GroundFault Current Path,79Effective)
b. Answer:79effectiveground-fault79current79path
9. A(n)79
is79a79manual,79nonautomatic,79or79automatic79operated79devic
79
e79used79in79conjunction79with79a79transfer79switch79to79provide79a79means79of79directly79co
nnecting79load79conductors79to79a79power79source79and79of79disconnecting79the79transfer79s
witch.
a. NEC®Reference:79Article1007 9 (TransferSwitch,Bypass79 Isolation)
b. Answer:bypass79isolation7 9 transfer79switch
10. A79surface,79flush,79or79freestanding79assemblage79with79a79raceway,79fittings,79
or79other79enclosure79provided79with79one79or79more79receptacles,79for79the79purp
ose79of79supplying79power79to79utilization79equipment79is79called79a(n).
a. NEC®Reference:Article10079(Multioutlet79Assembly)
b. Answer:multioutlet7 9 assembly
11. A79raceway79encased79in79479in.79(10279mm)79of79concrete79on79the79ground79floor79(in79dir
ect79contact79with79the79earth)79shall79be79considered79a(n)7979location.
a. NEC®Reference:79Article7910079(Location,79Wet)
b. Answer:wet
12. A(n)79
79may79consist79of79one79or79more79sensing79elements79in
tegral79with79the79motor-compressor79and79an79external79control79device.
a. NEC®Reference:Article100(ThermalProtector:InformationalNote)
b. Answer:thermalprotector
