ICC Residential Electrical Inspector (E1)
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. What is the minimum branch circuit rating required for general
lighting in dwelling units per NEC?
A. 10 amperes
B. 15 amperes
C. 20 amperes
D. 30 amperes
Correct Answer: C. 20 amperes
Rationale: General lighting circuits in dwelling units are typically
required to be at least 20 amps to handle standard residential loads
safely.
2. Which device is required in bathrooms of dwelling units?
A. AFCI
, B. GFCI
C. Surge protector
D. Disconnect switch
Correct Answer: B. GFCI
Rationale: GFCI protection is required in bathrooms to protect against
shock hazards in wet locations.
3. What is the maximum fill percentage for more than two conductors in
a conduit?
A. 31%
B. 40%
C. 53%
D. 60%
Correct Answer: B. 40%
Rationale: Conduit fill is limited to 40% when more than two
conductors are installed in a raceway.
4. Which wiring method is commonly used in residential wood frame
construction?
A. EMT
B. PVC only
C. NM cable
D. Rigid steel conduit
Correct Answer: C. NM cable
, Rationale: Nonmetallic-sheathed cable is widely used in residential
dwellings due to ease of installation.
5. AFCI protection is primarily designed to protect against:
A. Overload
B. Ground faults
C. Arc faults
D. Lightning strikes
Correct Answer: C. Arc faults
Rationale: AFCIs detect arc faults that can cause electrical fires in
wiring systems.
6. The maximum number of 14 AWG conductors allowed on a 15A circuit
is:
A. 8
B. 10
C. 12
D. Unlimited
Correct Answer: D. Unlimited
Rationale: There is no limit on number of outlets, only load
restrictions apply.
7. What is the minimum clearance for overhead service conductors
above residential roofs?
A. 3 ft
, B. 6 ft
C. 8 ft
D. 10 ft
Correct Answer: B. 6 ft
Rationale: NEC requires minimum clearance depending on slope and
accessibility, typically 6 ft or more.
8. A GFCI trips when it detects:
A. Overcurrent
B. Ground fault current imbalance
C. High voltage
D. Low resistance only
Correct Answer: B. Ground fault current imbalance
Rationale: GFCI devices sense imbalance between hot and neutral
conductors.
9. Minimum burial depth for PVC conduit under a residential driveway is
typically:
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Correct Answer: C. 18 inches
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What is the minimum branch circuit rating required for general
lighting in dwelling units per NEC?
A. 10 amperes
B. 15 amperes
C. 20 amperes
D. 30 amperes
Correct Answer: C. 20 amperes
Rationale: General lighting circuits in dwelling units are typically
required to be at least 20 amps to handle standard residential loads
safely.
2. Which device is required in bathrooms of dwelling units?
A. AFCI
, B. GFCI
C. Surge protector
D. Disconnect switch
Correct Answer: B. GFCI
Rationale: GFCI protection is required in bathrooms to protect against
shock hazards in wet locations.
3. What is the maximum fill percentage for more than two conductors in
a conduit?
A. 31%
B. 40%
C. 53%
D. 60%
Correct Answer: B. 40%
Rationale: Conduit fill is limited to 40% when more than two
conductors are installed in a raceway.
4. Which wiring method is commonly used in residential wood frame
construction?
A. EMT
B. PVC only
C. NM cable
D. Rigid steel conduit
Correct Answer: C. NM cable
, Rationale: Nonmetallic-sheathed cable is widely used in residential
dwellings due to ease of installation.
5. AFCI protection is primarily designed to protect against:
A. Overload
B. Ground faults
C. Arc faults
D. Lightning strikes
Correct Answer: C. Arc faults
Rationale: AFCIs detect arc faults that can cause electrical fires in
wiring systems.
6. The maximum number of 14 AWG conductors allowed on a 15A circuit
is:
A. 8
B. 10
C. 12
D. Unlimited
Correct Answer: D. Unlimited
Rationale: There is no limit on number of outlets, only load
restrictions apply.
7. What is the minimum clearance for overhead service conductors
above residential roofs?
A. 3 ft
, B. 6 ft
C. 8 ft
D. 10 ft
Correct Answer: B. 6 ft
Rationale: NEC requires minimum clearance depending on slope and
accessibility, typically 6 ft or more.
8. A GFCI trips when it detects:
A. Overcurrent
B. Ground fault current imbalance
C. High voltage
D. Low resistance only
Correct Answer: B. Ground fault current imbalance
Rationale: GFCI devices sense imbalance between hot and neutral
conductors.
9. Minimum burial depth for PVC conduit under a residential driveway is
typically:
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Correct Answer: C. 18 inches
