Electrical Inspector Exam
Questions And Correct
Answers (Verified Answers)
Plus Rationales 2025/2026
Q&A | Instant Download Pdf
1. What is the primary purpose of the National Electrical Code
(NEC)?
A. To design electrical systems
B. To provide minimum safety requirements
C. To maximize energy efficiency
D. To replace local codes
Answer: B
Rationale: The NEC establishes minimum safety standards for
electrical installations, not design or efficiency requirements.
2. Which NEC article covers general requirements for wiring and
protection?
A. Article 100
B. Article 200
C. Article 300
D. Article 400
Answer: C
Rationale: Article 300 covers general requirements for wiring
methods and materials.
3. What is the standard voltage for residential single-phase service
in North America?
,A. 120/240V
B. 277/480V
C. 208Y/120V
D. 600V
Answer: A
Rationale: Residential services are typically 120/240V single-phase
systems.
4. Grounding conductors are intended to:
A. Carry normal load current
B. Provide a return path for overloads
C. Carry fault current safely
D. Increase voltage stability
Answer: C
Rationale: Grounding conductors carry fault current to facilitate
protective device operation.
5. Which device protects against overloads and short circuits?
A. Transformer
B. Circuit breaker
C. Conduit
D. Meter
Answer: B
Rationale: Circuit breakers interrupt current during overload or short
circuit conditions.
6. What is the minimum cover requirement for PVC conduit under a
residential driveway?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Answer: C
Rationale: NEC requires 18 inches of cover under residential
driveways for PVC conduit.
, 7. Which color is typically used for grounding conductors?
A. White
B. Green
C. Red
D. Blue
Answer: B
Rationale: Green is universally used for equipment grounding
conductors.
8. A GFCI is designed to protect against:
A. Overvoltage
B. Ground faults
C. Power surges
D. Short circuits only
Answer: B
Rationale: Ground Fault Circuit Interrupters protect against leakage
current to ground.
9. What is the maximum voltage for general-use receptacles in
dwelling units?
A. 120V
B. 240V
C. 600V
D. 480V
Answer: C
Rationale: NEC permits receptacles up to 600V in some applications,
though dwellings are typically lower.
10. Which article covers grounding and bonding?
A. Article 200
B. Article 250
C. Article 310
D. Article 400
Answer: B
Questions And Correct
Answers (Verified Answers)
Plus Rationales 2025/2026
Q&A | Instant Download Pdf
1. What is the primary purpose of the National Electrical Code
(NEC)?
A. To design electrical systems
B. To provide minimum safety requirements
C. To maximize energy efficiency
D. To replace local codes
Answer: B
Rationale: The NEC establishes minimum safety standards for
electrical installations, not design or efficiency requirements.
2. Which NEC article covers general requirements for wiring and
protection?
A. Article 100
B. Article 200
C. Article 300
D. Article 400
Answer: C
Rationale: Article 300 covers general requirements for wiring
methods and materials.
3. What is the standard voltage for residential single-phase service
in North America?
,A. 120/240V
B. 277/480V
C. 208Y/120V
D. 600V
Answer: A
Rationale: Residential services are typically 120/240V single-phase
systems.
4. Grounding conductors are intended to:
A. Carry normal load current
B. Provide a return path for overloads
C. Carry fault current safely
D. Increase voltage stability
Answer: C
Rationale: Grounding conductors carry fault current to facilitate
protective device operation.
5. Which device protects against overloads and short circuits?
A. Transformer
B. Circuit breaker
C. Conduit
D. Meter
Answer: B
Rationale: Circuit breakers interrupt current during overload or short
circuit conditions.
6. What is the minimum cover requirement for PVC conduit under a
residential driveway?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Answer: C
Rationale: NEC requires 18 inches of cover under residential
driveways for PVC conduit.
, 7. Which color is typically used for grounding conductors?
A. White
B. Green
C. Red
D. Blue
Answer: B
Rationale: Green is universally used for equipment grounding
conductors.
8. A GFCI is designed to protect against:
A. Overvoltage
B. Ground faults
C. Power surges
D. Short circuits only
Answer: B
Rationale: Ground Fault Circuit Interrupters protect against leakage
current to ground.
9. What is the maximum voltage for general-use receptacles in
dwelling units?
A. 120V
B. 240V
C. 600V
D. 480V
Answer: C
Rationale: NEC permits receptacles up to 600V in some applications,
though dwellings are typically lower.
10. Which article covers grounding and bonding?
A. Article 200
B. Article 250
C. Article 310
D. Article 400
Answer: B
