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SOLUTION AND ANSWER GUIDE TO THE NATIONAL
ELECTRICAL CODE 9TH EDITION BY CHARLES R.
MILLER CHAPTER 1-19 FULL MANUAL WITH
VERIFIED SOLUTIONS
MILLER/SANDEFUR, ILLUSTRATED GUIDE TO THE NEC®, 21E, ©2024, 9780357766712;
UNIT 1: INTRODUCTION TO THE NATIONAL ELECTRICAL CODE®
TABLE OF CONTENTS
Unit 1 Competency Test ............................................................................................................... 1
UNIT1COMPETENCY TEST
1. The National Fire Protection Association has acted as sponsor of the
National Electrical Code since .
a. NEC®Reference: Page 1
b. Answer:1911
2. Informative Annex provides a list of productsafetystandards used
for product listing where that listing is required by the NEC.
a. NEC®Reference:InformativeAnnexA
b. Answer:A
3. Which chapters in the NEC apply generally to all installations?
a. NEC®Reference: 90.3
b. Answer: Chapters 1, 2, 3, and 4
4. Every three years, the National Electrical Code is revised, but the Code has only been
on a three- year revision cycle since .
a. NEC®Reference: Page 1
b. Answer:1975
5. The purpose of the National Electrical Code is the practical safeguarding of
from hazards arising from the use of electricity.
a. NEC®Reference:personsand property
b. Answer:90.2(A)
6. The original Code document was developed in as aresult of the
united efforts of various insurance, electrical, architectural, and allied interests.
a. NEC®Reference: Page 1
b. Answer:1897
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7. Informative annexes are not part of the requirements of the NEC but are included for
only.
a. NEC®Reference: 90.3
b. Answer: informational purposes
8. What city was home to the first central-station electric generating plant
developed by Thomas A. Edison?
a. NEC®Reference: Page 2
b. Answer: New York City
9. Chapter consists of tables that are applicable as referenced.
a. NEC®Reference: 90.3
b. Answer:9
10. In the NEC, UL is the abbreviation for .
a. NEC®Reference:Annex I, footnote under Table I.3
b. Answer: Underwriters Laboratories
11. Equipment that is listed, labeled, or both, or identified for a use shall be installed
and used in accordance with any included in the listing, labeling,
or identification.
a. NEC®Reference: 110.3(B)
b. Answer:instructions
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MILLER/SANDEFUR, ILLUSTRATED GUIDE TO THE NEC®, 21E, ©2024,
9780357766712; UNIT 2: DEFINITIONS®
TABLE OF CONTENTS
Unit 2 Competency Test ............................................................................................................... 1
UNIT2COMPETENCY TEST
1. A(n) branch circuit supplies two or more receptacles or
outlets for lighting and appliances.
a. NEC®Reference:Article100 (Branch-Circuit,GeneralPurpose)
b. Answer:generalpurpose
2. is the largest amount of current capable of being delivered at a
point on the electrical system during a short-circuit condition.
a. NEC®Reference: Article 100 (FaultzxCurrent, Available)
b. Answer: Available faultcurrent
3. A(n) branch circuit consists of two or more ungrounded
conductors having a potential difference between them, and a grounded conductor
having equal potential difference between it and each ungrounded conductor of the
circuit and that is connected to the neutral or grounded conductor of the system.
a. NEC®Reference: multiwire
b. Answer: Article100 (Branch-Circuit,Multiwire)
4. An intermittent operation in which load conditions are regularly recurrent
is the definition of .
a. NEC®Reference:Article100(Duty,Periodic)
b. Answer:periodiczxduty
5. The is theconnection between the grounded-circuit conductor
and the equipment grounding conductor at the service.
a. NEC®Reference: Article 100 (BondingzxJumper, Main)
b. Answer: mainbonding jumper
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6. A(n) is used to connect the system grounded conductor or
the equipment to a grounding electrode or to a point on the grounding electrode
system.
a. NEC®Reference:Article100 (GroundingElectrodeConductor)
b. Answer:groundingzxelectrode conductor
7. Rainproof, raintight, or watertight equipment can fulfill the requirements for
where varying weather conditions other than wetness,
such as snow, ice, dust, or temperature extremes, are not a factor.
a. NEC®Reference: Article 100 (Weatherproof: Informational Note)
b. Answer:weatherproof
8. A(n) is an intentionally constructed, low-impedance
electrically conductive path designed and intended to carry current during ground-fault
events from the point of a ground fault on a wiring system to the electrical supply
source and that facilitates the operation of the overcurrent protective device or ground-
fault detectors.
a. NEC®Reference: Article 100 (GroundFaultzxCurrentzxPath, Effective)
b. Answer: effectiveground-fault current path
9. A(n) is a manual, nonautomatic, or automatic operated device used
in conjunction with a transfer switch to provide a means of directly connecting load
conductors to a power source and of disconnecting the transfer switch.
a. NEC®Reference: Article100 (TransferSwitch,Bypass Isolation)
b. Answer:bypass isolationzxtransfer switch
10. A surface, flush, or freestanding assemblage with a raceway, fittings, or other
enclosure provided with one or more receptacles, for the purpose of supplying
power to utilization equipment is called a(n).
a. NEC®Reference:Article100 (Multioutlet Assembly)
b. Answer:multioutletzxassembly
11. A raceway encased in 4 in. (102 mm) of concrete on the ground floor (in direct contact
with the earth) shall be considered a(n) location.
a. NEC®Reference: Article 100 (Location, Wet)
b. Answer:wet
12. A(n) may consist of one or more sensing elements integral
with the motor-compressor and an external control device.
a. NEC®Reference:Article100(ThermalProtector:InformationalNote)
b. Answer:thermalprotector
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SOLUTION AND ANSWER GUIDE TO THE NATIONAL
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MILLER CHAPTER 1-19 FULL MANUAL WITH
VERIFIED SOLUTIONS
MILLER/SANDEFUR, ILLUSTRATED GUIDE TO THE NEC®, 21E, ©2024, 9780357766712;
UNIT 1: INTRODUCTION TO THE NATIONAL ELECTRICAL CODE®
TABLE OF CONTENTS
Unit 1 Competency Test ............................................................................................................... 1
UNIT1COMPETENCY TEST
1. The National Fire Protection Association has acted as sponsor of the
National Electrical Code since .
a. NEC®Reference: Page 1
b. Answer:1911
2. Informative Annex provides a list of productsafetystandards used
for product listing where that listing is required by the NEC.
a. NEC®Reference:InformativeAnnexA
b. Answer:A
3. Which chapters in the NEC apply generally to all installations?
a. NEC®Reference: 90.3
b. Answer: Chapters 1, 2, 3, and 4
4. Every three years, the National Electrical Code is revised, but the Code has only been
on a three- year revision cycle since .
a. NEC®Reference: Page 1
b. Answer:1975
5. The purpose of the National Electrical Code is the practical safeguarding of
from hazards arising from the use of electricity.
a. NEC®Reference:personsand property
b. Answer:90.2(A)
6. The original Code document was developed in as aresult of the
united efforts of various insurance, electrical, architectural, and allied interests.
a. NEC®Reference: Page 1
b. Answer:1897
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7. Informative annexes are not part of the requirements of the NEC but are included for
only.
a. NEC®Reference: 90.3
b. Answer: informational purposes
8. What city was home to the first central-station electric generating plant
developed by Thomas A. Edison?
a. NEC®Reference: Page 2
b. Answer: New York City
9. Chapter consists of tables that are applicable as referenced.
a. NEC®Reference: 90.3
b. Answer:9
10. In the NEC, UL is the abbreviation for .
a. NEC®Reference:Annex I, footnote under Table I.3
b. Answer: Underwriters Laboratories
11. Equipment that is listed, labeled, or both, or identified for a use shall be installed
and used in accordance with any included in the listing, labeling,
or identification.
a. NEC®Reference: 110.3(B)
b. Answer:instructions
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MILLER/SANDEFUR, ILLUSTRATED GUIDE TO THE NEC®, 21E, ©2024,
9780357766712; UNIT 2: DEFINITIONS®
TABLE OF CONTENTS
Unit 2 Competency Test ............................................................................................................... 1
UNIT2COMPETENCY TEST
1. A(n) branch circuit supplies two or more receptacles or
outlets for lighting and appliances.
a. NEC®Reference:Article100 (Branch-Circuit,GeneralPurpose)
b. Answer:generalpurpose
2. is the largest amount of current capable of being delivered at a
point on the electrical system during a short-circuit condition.
a. NEC®Reference: Article 100 (FaultzxCurrent, Available)
b. Answer: Available faultcurrent
3. A(n) branch circuit consists of two or more ungrounded
conductors having a potential difference between them, and a grounded conductor
having equal potential difference between it and each ungrounded conductor of the
circuit and that is connected to the neutral or grounded conductor of the system.
a. NEC®Reference: multiwire
b. Answer: Article100 (Branch-Circuit,Multiwire)
4. An intermittent operation in which load conditions are regularly recurrent
is the definition of .
a. NEC®Reference:Article100(Duty,Periodic)
b. Answer:periodiczxduty
5. The is theconnection between the grounded-circuit conductor
and the equipment grounding conductor at the service.
a. NEC®Reference: Article 100 (BondingzxJumper, Main)
b. Answer: mainbonding jumper
AL
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6. A(n) is used to connect the system grounded conductor or
the equipment to a grounding electrode or to a point on the grounding electrode
system.
a. NEC®Reference:Article100 (GroundingElectrodeConductor)
b. Answer:groundingzxelectrode conductor
7. Rainproof, raintight, or watertight equipment can fulfill the requirements for
where varying weather conditions other than wetness,
such as snow, ice, dust, or temperature extremes, are not a factor.
a. NEC®Reference: Article 100 (Weatherproof: Informational Note)
b. Answer:weatherproof
8. A(n) is an intentionally constructed, low-impedance
electrically conductive path designed and intended to carry current during ground-fault
events from the point of a ground fault on a wiring system to the electrical supply
source and that facilitates the operation of the overcurrent protective device or ground-
fault detectors.
a. NEC®Reference: Article 100 (GroundFaultzxCurrentzxPath, Effective)
b. Answer: effectiveground-fault current path
9. A(n) is a manual, nonautomatic, or automatic operated device used
in conjunction with a transfer switch to provide a means of directly connecting load
conductors to a power source and of disconnecting the transfer switch.
a. NEC®Reference: Article100 (TransferSwitch,Bypass Isolation)
b. Answer:bypass isolationzxtransfer switch
10. A surface, flush, or freestanding assemblage with a raceway, fittings, or other
enclosure provided with one or more receptacles, for the purpose of supplying
power to utilization equipment is called a(n).
a. NEC®Reference:Article100 (Multioutlet Assembly)
b. Answer:multioutletzxassembly
11. A raceway encased in 4 in. (102 mm) of concrete on the ground floor (in direct contact
with the earth) shall be considered a(n) location.
a. NEC®Reference: Article 100 (Location, Wet)
b. Answer:wet
12. A(n) may consist of one or more sensing elements integral
with the motor-compressor and an external control device.
a. NEC®Reference:Article100(ThermalProtector:InformationalNote)
b. Answer:thermalprotector
IONAL
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