ICC Commercial Electrical Inspector (E2)
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. What is the minimum clearance required for overhead conductors
above a residential driveway?
A. 10 ft
B. 12 ft
C. 15 ft
D. 18 ft
Answer: B. 12 ft
Rationale: NEC 230.24 requires a minimum 12 ft clearance over
residential driveways for overhead service conductors.
2. Which article of the NEC covers grounding and bonding?
A. Article 250
B. Article 300
, C. Article 310
D. Article 220
Answer: A. Article 250
Rationale: Article 250 governs grounding and bonding requirements
for electrical systems.
3. What is the maximum voltage permitted for general-use receptacles in
dwelling units?
A. 120V
B. 150V
C. 240V
D. 600V
Answer: D. 600V
Rationale: NEC permits up to 600V for general-use receptacles in
certain applications, though dwellings typically use 120/240V
systems.
4. What is the minimum burial depth for a PVC conduit carrying 120V
branch circuits under a residential yard?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Answer: C. 18 inches
, Rationale: NEC Table 300.5 requires 18 inches cover for PVC conduit
under residential yards for branch circuits.
5. Which device protects against overcurrent conditions?
A. Transformer
B. Circuit breaker
C. Receptacle
D. Switch
Answer: B. Circuit breaker
Rationale: Circuit breakers automatically open the circuit when
overcurrent is detected.
6. What is the purpose of equipment grounding?
A. Increase voltage
B. Stabilize voltage
C. Provide a fault current path
D. Reduce load
Answer: C. Provide a fault current path
Rationale: Equipment grounding provides a safe path for fault
current to return to the source.
7. The NEC requires working clearances in front of electrical equipment
to be at least:
A. 2 feet
B. 3 feet
C. 4 feet
, D. 6 feet
Answer: B. 3 feet
Rationale: NEC 110.26 requires a minimum of 3 feet working
clearance in front of electrical equipment.
8. What is the standard color for a grounded (neutral) conductor?
A. Green
B. White
C. Red
D. Black
Answer: B. White
Rationale: The neutral grounded conductor is typically white or gray
per NEC 200.6.
9. What is the function of a transformer?
A. Store energy
B. Convert AC to DC
C. Change voltage levels
D. Limit current
Answer: C. Change voltage levels
Rationale: Transformers increase or decrease AC voltage levels
through electromagnetic induction.
10. Which of the following is required for all 15A and 20A, 125V
receptacles in commercial buildings?
A. AFCI protection
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What is the minimum clearance required for overhead conductors
above a residential driveway?
A. 10 ft
B. 12 ft
C. 15 ft
D. 18 ft
Answer: B. 12 ft
Rationale: NEC 230.24 requires a minimum 12 ft clearance over
residential driveways for overhead service conductors.
2. Which article of the NEC covers grounding and bonding?
A. Article 250
B. Article 300
, C. Article 310
D. Article 220
Answer: A. Article 250
Rationale: Article 250 governs grounding and bonding requirements
for electrical systems.
3. What is the maximum voltage permitted for general-use receptacles in
dwelling units?
A. 120V
B. 150V
C. 240V
D. 600V
Answer: D. 600V
Rationale: NEC permits up to 600V for general-use receptacles in
certain applications, though dwellings typically use 120/240V
systems.
4. What is the minimum burial depth for a PVC conduit carrying 120V
branch circuits under a residential yard?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Answer: C. 18 inches
, Rationale: NEC Table 300.5 requires 18 inches cover for PVC conduit
under residential yards for branch circuits.
5. Which device protects against overcurrent conditions?
A. Transformer
B. Circuit breaker
C. Receptacle
D. Switch
Answer: B. Circuit breaker
Rationale: Circuit breakers automatically open the circuit when
overcurrent is detected.
6. What is the purpose of equipment grounding?
A. Increase voltage
B. Stabilize voltage
C. Provide a fault current path
D. Reduce load
Answer: C. Provide a fault current path
Rationale: Equipment grounding provides a safe path for fault
current to return to the source.
7. The NEC requires working clearances in front of electrical equipment
to be at least:
A. 2 feet
B. 3 feet
C. 4 feet
, D. 6 feet
Answer: B. 3 feet
Rationale: NEC 110.26 requires a minimum of 3 feet working
clearance in front of electrical equipment.
8. What is the standard color for a grounded (neutral) conductor?
A. Green
B. White
C. Red
D. Black
Answer: B. White
Rationale: The neutral grounded conductor is typically white or gray
per NEC 200.6.
9. What is the function of a transformer?
A. Store energy
B. Convert AC to DC
C. Change voltage levels
D. Limit current
Answer: C. Change voltage levels
Rationale: Transformers increase or decrease AC voltage levels
through electromagnetic induction.
10. Which of the following is required for all 15A and 20A, 125V
receptacles in commercial buildings?
A. AFCI protection
