NATIONAL ELECTRICAL CODE (NEC)
FUNDAMENTALS EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) Q&A 2027
|INSTANT DOWNLOAD PDF
1. What is the primary purpose of the National Electrical Code
(NEC)?
A. To regulate electricity prices
B. To provide practical safeguards for persons and property
from electrical hazards
C. To train electricians
D. To design utility power plants
Correct Answer: B. To provide practical safeguards for persons
and property from electrical hazards
Rationale: The NEC establishes requirements intended to
protect people and property from hazards arising from the use
of electricity.
2. Which organization publishes the National Electrical Code?
A. OSHA
B. IEEE
C. NFPA
D. ANSI alone
,Correct Answer: C. NFPA
Rationale: NFPA publishes NFPA 70, the National Electrical
Code.
3. Which NEC article contains general requirements for
conductors?
A. Article 100
B. Article 110
C. Article 200
D. Article 300
Correct Answer: D. Article 300
Rationale: Article 300 provides general requirements for wiring
methods and conductors.
4. What does NEC Article 100 primarily contain?
A. Definitions
B. Transformer requirements
C. Motor requirements
D. Fire alarm requirements
Correct Answer: A. Definitions
Rationale: Article 100 contains important definitions used
throughout the NEC.
,5. What is the purpose of an overcurrent protective device
(OCPD)?
A. Increase circuit voltage
B. Protect conductors and equipment from excessive current
C. Improve power factor
D. Increase conductor resistance
Correct Answer: B. Protect conductors and equipment from
excessive current
Rationale: Fuses and circuit breakers interrupt excessive
current caused by overloads or faults.
6. Which device is commonly used to provide overcurrent
protection for a branch circuit?
A. Circuit breaker
B. Transformer
C. Receptacle
D. Switch box
Correct Answer: A. Circuit breaker
Rationale: Circuit breakers are common overcurrent protective
devices used to protect branch circuits.
7. What is the nominal voltage of a typical U.S. single-phase
residential circuit supplying general-purpose receptacles?
, A. 12 V
B. 24 V
C. 120 V
D. 480 V
Correct Answer: C. 120 V
Rationale: Many general-purpose residential receptacle circuits
operate at a nominal 120 volts.
8. Which conductor normally carries current back to the
source on a typical single-phase circuit?
A. Grounding electrode conductor
B. Equipment grounding conductor
C. Neutral conductor
D. Bonding jumper
Correct Answer: C. Neutral conductor
Rationale: In a typical line-to-neutral circuit, the neutral is the
grounded circuit conductor that carries return current.
9. What is the primary purpose of an equipment grounding
conductor (EGC)?
A. Carry normal circuit current
B. Provide a low-impedance path for fault current
C. Increase voltage
D. Reduce load current
FUNDAMENTALS EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) Q&A 2027
|INSTANT DOWNLOAD PDF
1. What is the primary purpose of the National Electrical Code
(NEC)?
A. To regulate electricity prices
B. To provide practical safeguards for persons and property
from electrical hazards
C. To train electricians
D. To design utility power plants
Correct Answer: B. To provide practical safeguards for persons
and property from electrical hazards
Rationale: The NEC establishes requirements intended to
protect people and property from hazards arising from the use
of electricity.
2. Which organization publishes the National Electrical Code?
A. OSHA
B. IEEE
C. NFPA
D. ANSI alone
,Correct Answer: C. NFPA
Rationale: NFPA publishes NFPA 70, the National Electrical
Code.
3. Which NEC article contains general requirements for
conductors?
A. Article 100
B. Article 110
C. Article 200
D. Article 300
Correct Answer: D. Article 300
Rationale: Article 300 provides general requirements for wiring
methods and conductors.
4. What does NEC Article 100 primarily contain?
A. Definitions
B. Transformer requirements
C. Motor requirements
D. Fire alarm requirements
Correct Answer: A. Definitions
Rationale: Article 100 contains important definitions used
throughout the NEC.
,5. What is the purpose of an overcurrent protective device
(OCPD)?
A. Increase circuit voltage
B. Protect conductors and equipment from excessive current
C. Improve power factor
D. Increase conductor resistance
Correct Answer: B. Protect conductors and equipment from
excessive current
Rationale: Fuses and circuit breakers interrupt excessive
current caused by overloads or faults.
6. Which device is commonly used to provide overcurrent
protection for a branch circuit?
A. Circuit breaker
B. Transformer
C. Receptacle
D. Switch box
Correct Answer: A. Circuit breaker
Rationale: Circuit breakers are common overcurrent protective
devices used to protect branch circuits.
7. What is the nominal voltage of a typical U.S. single-phase
residential circuit supplying general-purpose receptacles?
, A. 12 V
B. 24 V
C. 120 V
D. 480 V
Correct Answer: C. 120 V
Rationale: Many general-purpose residential receptacle circuits
operate at a nominal 120 volts.
8. Which conductor normally carries current back to the
source on a typical single-phase circuit?
A. Grounding electrode conductor
B. Equipment grounding conductor
C. Neutral conductor
D. Bonding jumper
Correct Answer: C. Neutral conductor
Rationale: In a typical line-to-neutral circuit, the neutral is the
grounded circuit conductor that carries return current.
9. What is the primary purpose of an equipment grounding
conductor (EGC)?
A. Carry normal circuit current
B. Provide a low-impedance path for fault current
C. Increase voltage
D. Reduce load current
