ICC RESIDENTIAL ELECTRICAL INSPECTOR EXAM
QUESTIONS AND CORRECT ANSWER WITH DETAILED
EXPLANATION GRADED A+ STUDY GUIDE LATEST
UPDATE 2026 100% CORRECT
1. The National Electrical Code (NEC) is primarily concerned with:
A. Structural safety
B. Electrical safety and installation requirements
C. Plumbing systems
D. Mechanical systems
Answer: B
Rationale: The NEC provides minimum safety requirements for electrical installations.
2. Which NEC article covers general requirements for wiring and protection?
A. Article 90
B. Article 100
C. Article 110
D. Article 210
Answer: C
Rationale: Article 110 covers general requirements including workmanship and safety.
3. A residential electrical inspector primarily ensures:
A. Design aesthetics
B. Code compliance of electrical installations
C. Contractor profitability
D. Architectural style
Answer: B
Rationale: Inspectors verify installations comply with adopted codes.
4. NM cable is commonly used for:
,A. Underground feeders
B. Interior residential wiring
C. Industrial plants
D. High-voltage systems
Answer: B
Rationale: NM (Romex) is standard for residential interior wiring.
5. The minimum size copper conductor for a 20A branch circuit is:
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Answer: B
Rationale: 12 AWG copper is required for 20-amp circuits.
6. AFCI devices protect against:
A. Overload only
B. Arc faults
C. Grounding issues
D. Lightning only
Answer: B
Rationale: AFCIs reduce fire risk from arc faults.
7. GFCI protection is designed to prevent:
A. Overcurrent
B. Electric shock
C. Voltage drop
D. Power surge
Answer: B
Rationale: GFCIs detect leakage current to ground.
8. The grounding electrode system connects to:
, A. Neutral bus only
B. Earth
C. Hot conductor
D. Switchboard
Answer: B
Rationale: Grounding electrodes connect electrical systems to earth.
9. A dwelling unit requires how many 20A small appliance circuits in the kitchen?
A. 1
B. 2
C. 3
D. 4
Answer: B
Rationale: NEC requires at least two 20A kitchen circuits.
10. Receptacles in bathrooms must be protected by:
A. AFCI
B. GFCI
C. Fuse only
D. No protection
Answer: B
Rationale: Bathrooms require GFCI protection.
11. Working clearance in front of a panelboard is typically:
A. 12 inches
B. 24 inches
C. 36 inches
D. 48 inches
Answer: C
Rationale: NEC requires 36-inch working depth minimum.
12. Voltage in a typical U.S. dwelling service is:
QUESTIONS AND CORRECT ANSWER WITH DETAILED
EXPLANATION GRADED A+ STUDY GUIDE LATEST
UPDATE 2026 100% CORRECT
1. The National Electrical Code (NEC) is primarily concerned with:
A. Structural safety
B. Electrical safety and installation requirements
C. Plumbing systems
D. Mechanical systems
Answer: B
Rationale: The NEC provides minimum safety requirements for electrical installations.
2. Which NEC article covers general requirements for wiring and protection?
A. Article 90
B. Article 100
C. Article 110
D. Article 210
Answer: C
Rationale: Article 110 covers general requirements including workmanship and safety.
3. A residential electrical inspector primarily ensures:
A. Design aesthetics
B. Code compliance of electrical installations
C. Contractor profitability
D. Architectural style
Answer: B
Rationale: Inspectors verify installations comply with adopted codes.
4. NM cable is commonly used for:
,A. Underground feeders
B. Interior residential wiring
C. Industrial plants
D. High-voltage systems
Answer: B
Rationale: NM (Romex) is standard for residential interior wiring.
5. The minimum size copper conductor for a 20A branch circuit is:
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Answer: B
Rationale: 12 AWG copper is required for 20-amp circuits.
6. AFCI devices protect against:
A. Overload only
B. Arc faults
C. Grounding issues
D. Lightning only
Answer: B
Rationale: AFCIs reduce fire risk from arc faults.
7. GFCI protection is designed to prevent:
A. Overcurrent
B. Electric shock
C. Voltage drop
D. Power surge
Answer: B
Rationale: GFCIs detect leakage current to ground.
8. The grounding electrode system connects to:
, A. Neutral bus only
B. Earth
C. Hot conductor
D. Switchboard
Answer: B
Rationale: Grounding electrodes connect electrical systems to earth.
9. A dwelling unit requires how many 20A small appliance circuits in the kitchen?
A. 1
B. 2
C. 3
D. 4
Answer: B
Rationale: NEC requires at least two 20A kitchen circuits.
10. Receptacles in bathrooms must be protected by:
A. AFCI
B. GFCI
C. Fuse only
D. No protection
Answer: B
Rationale: Bathrooms require GFCI protection.
11. Working clearance in front of a panelboard is typically:
A. 12 inches
B. 24 inches
C. 36 inches
D. 48 inches
Answer: C
Rationale: NEC requires 36-inch working depth minimum.
12. Voltage in a typical U.S. dwelling service is:
