Solution and Answer Guide: Miller/Sandefur, Illustrated Guide to the NEC®, 10e, ©2027, 9798214133461; Unit 1: Introduction to the National Electrical Code®
Solution and Answer Guide
MILLER/SANDEFUR , ILLUSTRATED GUIDE TO THE NEC®, 10E, ©2027, 9798214133461; UNIT 1:
INTRODUCTION TO THE NATIONAL ELECTRICAL CODE®
TABLE OF CONTENTS
Unit 1 Competency Test................................................................................................1
UNIT 1 COMPETENCY TEST
1. The National Fire Protection Association has acted as sponsor of the National Electrical Code
since__________________.
a. Reference: IG Page 2
b. Answer: 1911
2. Informative Annex _______________ provides a list of product safety standards used for product listing
where that listing is required by the NEC.
a. NEC® Reference: Informative Annex A
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. Reference: IG Page 2
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: 90.2(B)
b. Answer: persons and property
6. The original Code document was developed in _______________ as a result of the united efforts of various
insurance, electrical, architectural, and allied interests.
a. Reference: IG Page 2
b. Answer: 1897
© 2027 Cengage Learning, Inc. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly 1
accessible website, in whole or in part.
,Solution and Answer Guide: Miller/Sandefur, Illustrated Guide to the NEC®, 10e, ©2027, 9798214133461; Unit 1: Introduction to the National Electrical Code®
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. Reference: IG 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
© 2027 Cengage Learning, Inc. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly 2
accessible website, in whole or in part.
, Solution and Answer Guide: Miller/Sandefur, Illustrated Guide to the NEC®, 10e, ©2027, 9798214133461; Unit 2: Definitions®
Solution and Answer Guide
MILLER/SANDEFUR , ILLUSTRATED GUIDE TO THE NEC®, 10E, ©2027, 9798214133461; U NIT 2:
DEFINITIONS®
TABLE OF CONTENTS
Unit 2 Competency Test................................................................................................1
UNIT 2 COMPETENCY TEST
1. A(n) __________________ branch circuit supplies two or more receptacles or outlets for lighting and
appliances.
a. NEC® Reference: Article 100 (Branch-Circuit, General Purpose)
b. Answer: general purpose
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 (Fault Current, Available)
b. Answer: Available fault current
3. A(n) __________________ branch circuit consists of two or more ungrounded conductors that have a
voltage between them, and a neutral conductor that has equal voltage between it and each ungrounded
conductor of the circuit and that is connected to the neutral conductor of the system.
a. NEC® Reference: multiwire
b. Answer: Article 100 (Branch-Circuit, Multiwire)
4. An intermittent operation in which load conditions are regularly recurrent is the definition of
__________________.
a. NEC® Reference: Article 100 (Duty, Periodic)
b. Answer: periodic duty
5. The __________________ is the connection between the grounded-circuit conductor and the equipment
grounding conductor, or the supply-side bonding conductor, or both at the service equipment.
a. NEC® Reference: Article 100 (Bonding Jumper, Main)
b. Answer: main bonding jumper
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: Article 100 (Grounding Electrode Conductor)
b. Answer: grounding electrode 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
© 20YY Cengage Learning, Inc. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly 1
accessible website, in whole or in part.
, Solution and Answer Guide: Miller/Sandefur, Illustrated Guide to the NEC®, 10e, ©2027, 9798214133461; Unit 2: Definitions®
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 (Ground Fault Current Path, Effective)
b. Answer: effective ground-fault current path
9. A(n) __________ is equipment that includes a transfer switch and bypass isolation functionality.
a. NEC® Reference: Article 100 (Transfer Switch, Bypass Isolation)
b. Answer: bypass isolation transfer 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: Article 100 (Multioutlet Assembly)
b. Answer: multioutlet assembly
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) __________________ is a protective device for assembly as an integral part of a motor or motor-
compressor that, when properly applied, protects the motor against dangerous overheating due to overload
and failure to start.
a. NEC® Reference: Article 100 (Thermal Protector: Informational Note)
b. Answer: thermal protector
13. An enclosure designed for either surface or flush mounting and provided with a frame, mat, or trim in
which a swinging door or doors are or can be hung is called a(n) __________________.
a. NEC® Reference: Article 100 (Cabinet)
b. Answer: cabinet
14. A(n) __________________ is a shaftway, hatchway, well hole, or other vertical opening or space in which
an elevator or dumbwaiter is designed to operate.
a. NEC® Reference: Article 100 (Hoistway)
b. Answer: hoistway
15. A multiwire branch circuit can supply:
I. 120/240 volts to only one piece of utilization equipment
II. 120/240 volts where all ungrounded conductors are opened simultaneously
a) I only b) II only c) both I and II d) neither I nor II
a. NEC® Reference: 210.4(C) Exceptions No. 1 and 2
b. Answer: c) both I and II
16. An overcurrent protective device with a circuit-opening fusible part that is heated and severed by the
passage of overcurrent through it is the definition of a(n) __________________.
a. NEC® Reference: Article 100 (Fuse)
b. Answer: fuse
17. __________________ is a string of outdoor lights suspended between two points.
a. NEC® Reference: Article 100 (Festoon Lighting)
b. Answer: Festoon lighting
© 20YY Cengage Learning, Inc. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly 2
accessible website, in whole or in part.
Solution and Answer Guide
MILLER/SANDEFUR , ILLUSTRATED GUIDE TO THE NEC®, 10E, ©2027, 9798214133461; UNIT 1:
INTRODUCTION TO THE NATIONAL ELECTRICAL CODE®
TABLE OF CONTENTS
Unit 1 Competency Test................................................................................................1
UNIT 1 COMPETENCY TEST
1. The National Fire Protection Association has acted as sponsor of the National Electrical Code
since__________________.
a. Reference: IG Page 2
b. Answer: 1911
2. Informative Annex _______________ provides a list of product safety standards used for product listing
where that listing is required by the NEC.
a. NEC® Reference: Informative Annex A
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. Reference: IG Page 2
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: 90.2(B)
b. Answer: persons and property
6. The original Code document was developed in _______________ as a result of the united efforts of various
insurance, electrical, architectural, and allied interests.
a. Reference: IG Page 2
b. Answer: 1897
© 2027 Cengage Learning, Inc. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly 1
accessible website, in whole or in part.
,Solution and Answer Guide: Miller/Sandefur, Illustrated Guide to the NEC®, 10e, ©2027, 9798214133461; Unit 1: Introduction to the National Electrical Code®
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. Reference: IG 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
© 2027 Cengage Learning, Inc. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly 2
accessible website, in whole or in part.
, Solution and Answer Guide: Miller/Sandefur, Illustrated Guide to the NEC®, 10e, ©2027, 9798214133461; Unit 2: Definitions®
Solution and Answer Guide
MILLER/SANDEFUR , ILLUSTRATED GUIDE TO THE NEC®, 10E, ©2027, 9798214133461; U NIT 2:
DEFINITIONS®
TABLE OF CONTENTS
Unit 2 Competency Test................................................................................................1
UNIT 2 COMPETENCY TEST
1. A(n) __________________ branch circuit supplies two or more receptacles or outlets for lighting and
appliances.
a. NEC® Reference: Article 100 (Branch-Circuit, General Purpose)
b. Answer: general purpose
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 (Fault Current, Available)
b. Answer: Available fault current
3. A(n) __________________ branch circuit consists of two or more ungrounded conductors that have a
voltage between them, and a neutral conductor that has equal voltage between it and each ungrounded
conductor of the circuit and that is connected to the neutral conductor of the system.
a. NEC® Reference: multiwire
b. Answer: Article 100 (Branch-Circuit, Multiwire)
4. An intermittent operation in which load conditions are regularly recurrent is the definition of
__________________.
a. NEC® Reference: Article 100 (Duty, Periodic)
b. Answer: periodic duty
5. The __________________ is the connection between the grounded-circuit conductor and the equipment
grounding conductor, or the supply-side bonding conductor, or both at the service equipment.
a. NEC® Reference: Article 100 (Bonding Jumper, Main)
b. Answer: main bonding jumper
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: Article 100 (Grounding Electrode Conductor)
b. Answer: grounding electrode 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
© 20YY Cengage Learning, Inc. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly 1
accessible website, in whole or in part.
, Solution and Answer Guide: Miller/Sandefur, Illustrated Guide to the NEC®, 10e, ©2027, 9798214133461; Unit 2: Definitions®
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 (Ground Fault Current Path, Effective)
b. Answer: effective ground-fault current path
9. A(n) __________ is equipment that includes a transfer switch and bypass isolation functionality.
a. NEC® Reference: Article 100 (Transfer Switch, Bypass Isolation)
b. Answer: bypass isolation transfer 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: Article 100 (Multioutlet Assembly)
b. Answer: multioutlet assembly
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) __________________ is a protective device for assembly as an integral part of a motor or motor-
compressor that, when properly applied, protects the motor against dangerous overheating due to overload
and failure to start.
a. NEC® Reference: Article 100 (Thermal Protector: Informational Note)
b. Answer: thermal protector
13. An enclosure designed for either surface or flush mounting and provided with a frame, mat, or trim in
which a swinging door or doors are or can be hung is called a(n) __________________.
a. NEC® Reference: Article 100 (Cabinet)
b. Answer: cabinet
14. A(n) __________________ is a shaftway, hatchway, well hole, or other vertical opening or space in which
an elevator or dumbwaiter is designed to operate.
a. NEC® Reference: Article 100 (Hoistway)
b. Answer: hoistway
15. A multiwire branch circuit can supply:
I. 120/240 volts to only one piece of utilization equipment
II. 120/240 volts where all ungrounded conductors are opened simultaneously
a) I only b) II only c) both I and II d) neither I nor II
a. NEC® Reference: 210.4(C) Exceptions No. 1 and 2
b. Answer: c) both I and II
16. An overcurrent protective device with a circuit-opening fusible part that is heated and severed by the
passage of overcurrent through it is the definition of a(n) __________________.
a. NEC® Reference: Article 100 (Fuse)
b. Answer: fuse
17. __________________ is a string of outdoor lights suspended between two points.
a. NEC® Reference: Article 100 (Festoon Lighting)
b. Answer: Festoon lighting
© 20YY Cengage Learning, Inc. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly 2
accessible website, in whole or in part.
