NFPA 70 National Electrical Code Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. In accordance with NFPA 70, which of the following best describes the
primary purpose of the National Electrical Code?
A. To regulate utility company operations and tariffs
B. To provide guidelines for the design and installation of electrical systems
to safeguard persons and property
C. To establish mandatory federal electrical licensing requirements
D. To standardize electrical manufacturing processes worldwide
B
The NEC is primarily intended to provide practical safeguarding of persons
and property from hazards arising from the use of electricity through
proper design, installation, and inspection of electrical systems.
2. Which article of NFPA 70 specifically covers general requirements for
grounding and bonding?
A. Article 100
B. Article 250
C. Article 300
D. Article 310
,B
Article 250 of NFPA 70 contains the detailed requirements for grounding
and bonding, ensuring electrical systems are properly connected to earth
for safety and fault current control.
3. A grounded conductor is best defined as which of the following?
A. A conductor connected to earth but not intended to carry current under
normal operation
B. A conductor intentionally connected to ground and carrying current
during normal operation
C. A conductor used only for equipment grounding
D. A conductor that carries only fault current
B
A grounded conductor is intentionally connected to earth and is normally
current-carrying, such as the neutral conductor in a typical electrical
system.
4. According to NFPA 70, which condition requires GFCI protection in
dwelling units?
A. All lighting circuits above 120 volts
B. Outdoor receptacles and bathrooms
C. Only kitchen lighting circuits
D. Only HVAC equipment circuits
B
Ground-Fault Circuit-Interrupter protection is required in locations such as
bathrooms and outdoor receptacles in dwelling units to protect against
shock hazards.
5. What is the primary function of an equipment grounding conductor?
,A. Carry normal load current
B. Stabilize voltage levels during normal operation
C. Provide a low-resistance path for fault current
D. Increase circuit resistance for safety
C
An equipment grounding conductor provides a safe, low-impedance path
for fault current to facilitate rapid operation of overcurrent protection
devices.
6. Which of the following is required for all branch circuits supplying
dwelling unit kitchen countertop receptacles?
A. 15-ampere maximum rating
B. AFCI protection only
C. GFCI protection
D. Isolation transformer use
C
NFPA 70 requires GFCI protection for kitchen countertop receptacles in
dwelling units to reduce the risk of electrical shock.
7. The term “feeder” in NFPA 70 refers to which of the following?
A. Any circuit supplying lighting only
B. Conductors that supply power to branch circuits
C. A grounding electrode conductor
D. A service disconnect device
B
Feeders are conductors that carry power from the service equipment to
distribution points supplying branch circuits.
, 8. What is the minimum clearance required for overhead conductors
above residential driveways?
A. 8 feet
B. 10 feet
C. 12 feet
D. 15 feet
C
NFPA 70 requires at least 12 feet of clearance above residential driveways
to prevent accidental contact with overhead conductors.
9. Which article of NFPA 70 governs wiring methods and materials?
A. Article 90
B. Article 200
C. Article 300
D. Article 400
C
Article 300 covers general requirements for wiring methods and materials
used in electrical installations.
10. What is the maximum number of disconnects permitted for a
service in a single enclosure?
A. 3
B. 4
C. 6
D. 8
C
NFPA 70 permits up to six service disconnecting means in a single enclosure
to allow for safe and manageable service disconnection.
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. In accordance with NFPA 70, which of the following best describes the
primary purpose of the National Electrical Code?
A. To regulate utility company operations and tariffs
B. To provide guidelines for the design and installation of electrical systems
to safeguard persons and property
C. To establish mandatory federal electrical licensing requirements
D. To standardize electrical manufacturing processes worldwide
B
The NEC is primarily intended to provide practical safeguarding of persons
and property from hazards arising from the use of electricity through
proper design, installation, and inspection of electrical systems.
2. Which article of NFPA 70 specifically covers general requirements for
grounding and bonding?
A. Article 100
B. Article 250
C. Article 300
D. Article 310
,B
Article 250 of NFPA 70 contains the detailed requirements for grounding
and bonding, ensuring electrical systems are properly connected to earth
for safety and fault current control.
3. A grounded conductor is best defined as which of the following?
A. A conductor connected to earth but not intended to carry current under
normal operation
B. A conductor intentionally connected to ground and carrying current
during normal operation
C. A conductor used only for equipment grounding
D. A conductor that carries only fault current
B
A grounded conductor is intentionally connected to earth and is normally
current-carrying, such as the neutral conductor in a typical electrical
system.
4. According to NFPA 70, which condition requires GFCI protection in
dwelling units?
A. All lighting circuits above 120 volts
B. Outdoor receptacles and bathrooms
C. Only kitchen lighting circuits
D. Only HVAC equipment circuits
B
Ground-Fault Circuit-Interrupter protection is required in locations such as
bathrooms and outdoor receptacles in dwelling units to protect against
shock hazards.
5. What is the primary function of an equipment grounding conductor?
,A. Carry normal load current
B. Stabilize voltage levels during normal operation
C. Provide a low-resistance path for fault current
D. Increase circuit resistance for safety
C
An equipment grounding conductor provides a safe, low-impedance path
for fault current to facilitate rapid operation of overcurrent protection
devices.
6. Which of the following is required for all branch circuits supplying
dwelling unit kitchen countertop receptacles?
A. 15-ampere maximum rating
B. AFCI protection only
C. GFCI protection
D. Isolation transformer use
C
NFPA 70 requires GFCI protection for kitchen countertop receptacles in
dwelling units to reduce the risk of electrical shock.
7. The term “feeder” in NFPA 70 refers to which of the following?
A. Any circuit supplying lighting only
B. Conductors that supply power to branch circuits
C. A grounding electrode conductor
D. A service disconnect device
B
Feeders are conductors that carry power from the service equipment to
distribution points supplying branch circuits.
, 8. What is the minimum clearance required for overhead conductors
above residential driveways?
A. 8 feet
B. 10 feet
C. 12 feet
D. 15 feet
C
NFPA 70 requires at least 12 feet of clearance above residential driveways
to prevent accidental contact with overhead conductors.
9. Which article of NFPA 70 governs wiring methods and materials?
A. Article 90
B. Article 200
C. Article 300
D. Article 400
C
Article 300 covers general requirements for wiring methods and materials
used in electrical installations.
10. What is the maximum number of disconnects permitted for a
service in a single enclosure?
A. 3
B. 4
C. 6
D. 8
C
NFPA 70 permits up to six service disconnecting means in a single enclosure
to allow for safe and manageable service disconnection.
