COLORADO ICC COMMERCIAL ELECTRICAL
INSPECTOR EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) Q&A 2026
|INSTANT DOWNLOAD PDF
1. What is the primary purpose of the National Electrical Code
(NEC)?
A. To design electrical equipment
B. To provide minimum safety standards for electrical
installations
C. To regulate electrical utility pricing
D. To certify electricians
Rationale: The NEC is a safety code, not a design or pricing
document.
Correct Answer: B
2. Which organization publishes the NEC?
A. OSHA
B. NFPA
C. ICC
D. ANSI
Rationale: The NEC is developed and published by the National
Fire Protection Association.
Correct Answer: B
,3. What is the minimum depth for burying residential branch
circuits in PVC conduit under a yard?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Rationale: NEC Table 300.5 specifies burial depth requirements
depending on wiring method.
Correct Answer: C
4. What is the purpose of grounding in electrical systems?
A. Increase voltage
B. Provide a return path for normal current
C. Stabilize voltage and provide fault current path
D. Reduce wire size requirements
Rationale: Grounding ensures safety by providing a fault
current path and stabilizing voltage.
Correct Answer: C
5. Which device protects circuits from overcurrent?
A. Transformer
B. Switch
,C. Circuit breaker
D. Conductor
Rationale: Circuit breakers interrupt current when overload or
short circuit occurs.
Correct Answer: C
6. What does GFCI stand for?
A. Ground Fault Circuit Interruption
B. Ground Fault Circuit Interrupter
C. General Fuse Current Indicator
D. Ground Fuse Control Interface
Rationale: GFCI devices protect against electric shock from
ground faults.
Correct Answer: B
7. Which NEC article covers grounding and bonding?
A. Article 250
B. Article 300
C. Article 310
D. Article 400
Rationale: Article 250 is dedicated to grounding and bonding
requirements.
Correct Answer: A
, 8. What is the purpose of bonding in electrical systems?
A. Increase resistance
B. Ensure electrical continuity between metal parts
C. Reduce voltage drop
D. Increase insulation strength
Rationale: Bonding connects metal parts to ensure equal
potential and safety.
Correct Answer: B
9. What is the standard voltage for most commercial lighting
circuits in the U.S.?
A. 120V
B. 208V
C. 277V
D. 480V
Rationale: Commercial lighting commonly uses 277V from
480Y/277V systems.
Correct Answer: C
10. What is the function of a transformer?
A. Store electrical energy
B. Convert AC to DC
C. Change voltage levels
D. Protect from overload
INSPECTOR EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) Q&A 2026
|INSTANT DOWNLOAD PDF
1. What is the primary purpose of the National Electrical Code
(NEC)?
A. To design electrical equipment
B. To provide minimum safety standards for electrical
installations
C. To regulate electrical utility pricing
D. To certify electricians
Rationale: The NEC is a safety code, not a design or pricing
document.
Correct Answer: B
2. Which organization publishes the NEC?
A. OSHA
B. NFPA
C. ICC
D. ANSI
Rationale: The NEC is developed and published by the National
Fire Protection Association.
Correct Answer: B
,3. What is the minimum depth for burying residential branch
circuits in PVC conduit under a yard?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Rationale: NEC Table 300.5 specifies burial depth requirements
depending on wiring method.
Correct Answer: C
4. What is the purpose of grounding in electrical systems?
A. Increase voltage
B. Provide a return path for normal current
C. Stabilize voltage and provide fault current path
D. Reduce wire size requirements
Rationale: Grounding ensures safety by providing a fault
current path and stabilizing voltage.
Correct Answer: C
5. Which device protects circuits from overcurrent?
A. Transformer
B. Switch
,C. Circuit breaker
D. Conductor
Rationale: Circuit breakers interrupt current when overload or
short circuit occurs.
Correct Answer: C
6. What does GFCI stand for?
A. Ground Fault Circuit Interruption
B. Ground Fault Circuit Interrupter
C. General Fuse Current Indicator
D. Ground Fuse Control Interface
Rationale: GFCI devices protect against electric shock from
ground faults.
Correct Answer: B
7. Which NEC article covers grounding and bonding?
A. Article 250
B. Article 300
C. Article 310
D. Article 400
Rationale: Article 250 is dedicated to grounding and bonding
requirements.
Correct Answer: A
, 8. What is the purpose of bonding in electrical systems?
A. Increase resistance
B. Ensure electrical continuity between metal parts
C. Reduce voltage drop
D. Increase insulation strength
Rationale: Bonding connects metal parts to ensure equal
potential and safety.
Correct Answer: B
9. What is the standard voltage for most commercial lighting
circuits in the U.S.?
A. 120V
B. 208V
C. 277V
D. 480V
Rationale: Commercial lighting commonly uses 277V from
480Y/277V systems.
Correct Answer: C
10. What is the function of a transformer?
A. Store electrical energy
B. Convert AC to DC
C. Change voltage levels
D. Protect from overload
