IAEI Residential Electrical Inspector
Examination Practice Questions And
Correct Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
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1. What is the minimum size copper grounding electrode conductor for a
200-ampere residential service?
a) 6 AWG
b) 4 AWG
c) 2 AWG
d) 1/0 AWG
Rationale: According to NEC Table 250.66, a 200-amp service requires
a minimum 2 AWG copper grounding electrode conductor.
2. Which type of receptacle is required in a bathroom?
a) Standard 15A
, b) GFCI protected
c) AFCI protected
d) 20A only
Rationale: NEC 210.8(A)(1) requires GFCI protection for all bathroom
receptacles.
3. The maximum spacing of receptacles in a living room is:
a) 6 feet
b) 12 feet
c) 15 feet
d) 24 feet
Rationale: NEC 210.52(A) specifies that receptacles shall be installed
so that no point along the wall is more than 6 feet from a receptacle,
effectively requiring spacing of 12 feet.
4. A dwelling unit requires a minimum of how many branch circuits for
the kitchen countertop receptacles?
a) 1
b) 2
c) 2 or more
d) 3
Rationale: NEC 210.11(C)(1) requires at least two 20-amp small
appliance branch circuits for kitchen countertops.
5. Which conductor color is generally used for a neutral in residential
wiring?
, a) Black
b) Red
c) Blue
d) White
Rationale: NEC 200.6 requires that grounded (neutral) conductors be
white or gray.
6. The minimum clearance from the ground for service-entrance
conductors over a residential driveway is:
a) 10 feet
b) 12 feet
c) 18 feet
d) 20 feet
Rationale: NEC 230.24 requires 18 feet minimum clearance over
residential driveways for service conductors.
7. A 120/240V single-phase dwelling service may be supplied by which
type of conductor configuration?
a) Single ungrounded conductor
b) Two ungrounded and one grounded conductor
c) Two ungrounded and one grounded conductor
d) Three ungrounded conductors only
Rationale: Standard residential service uses 120/240V split-phase
with two hot (ungrounded) and one neutral (grounded) conductor.
, 8. What is the minimum height for wall-mounted receptacles in a kitchen
from the finished floor?
a) 12 inches
b) 15 inches
c) 18 inches
d) 24 inches
Rationale: NEC 210.52(C)(5) suggests a practical minimum of 15
inches above finished floor for countertop receptacles.
9. A habitable room requires a lighting outlet. How is this defined?
a) Only ceiling-mounted fixture
b) Only wall switch-controlled outlet
c) Any outlet that provides illumination
d) Only a ceiling fan fixture
Rationale: NEC 210.70(A)(1) requires at least one lighting outlet in
every habitable room, which can be ceiling or wall-controlled.
10. AFCI protection is required for which locations in a dwelling?
a) Kitchens
b) Bathrooms
c) Bedrooms
d) Garages
Rationale: NEC 210.12(A) requires AFCI protection for all 120V, 15-
and 20-ampere branch circuits supplying outlets in dwelling unit
bedrooms.
Examination Practice Questions And
Correct Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
1. What is the minimum size copper grounding electrode conductor for a
200-ampere residential service?
a) 6 AWG
b) 4 AWG
c) 2 AWG
d) 1/0 AWG
Rationale: According to NEC Table 250.66, a 200-amp service requires
a minimum 2 AWG copper grounding electrode conductor.
2. Which type of receptacle is required in a bathroom?
a) Standard 15A
, b) GFCI protected
c) AFCI protected
d) 20A only
Rationale: NEC 210.8(A)(1) requires GFCI protection for all bathroom
receptacles.
3. The maximum spacing of receptacles in a living room is:
a) 6 feet
b) 12 feet
c) 15 feet
d) 24 feet
Rationale: NEC 210.52(A) specifies that receptacles shall be installed
so that no point along the wall is more than 6 feet from a receptacle,
effectively requiring spacing of 12 feet.
4. A dwelling unit requires a minimum of how many branch circuits for
the kitchen countertop receptacles?
a) 1
b) 2
c) 2 or more
d) 3
Rationale: NEC 210.11(C)(1) requires at least two 20-amp small
appliance branch circuits for kitchen countertops.
5. Which conductor color is generally used for a neutral in residential
wiring?
, a) Black
b) Red
c) Blue
d) White
Rationale: NEC 200.6 requires that grounded (neutral) conductors be
white or gray.
6. The minimum clearance from the ground for service-entrance
conductors over a residential driveway is:
a) 10 feet
b) 12 feet
c) 18 feet
d) 20 feet
Rationale: NEC 230.24 requires 18 feet minimum clearance over
residential driveways for service conductors.
7. A 120/240V single-phase dwelling service may be supplied by which
type of conductor configuration?
a) Single ungrounded conductor
b) Two ungrounded and one grounded conductor
c) Two ungrounded and one grounded conductor
d) Three ungrounded conductors only
Rationale: Standard residential service uses 120/240V split-phase
with two hot (ungrounded) and one neutral (grounded) conductor.
, 8. What is the minimum height for wall-mounted receptacles in a kitchen
from the finished floor?
a) 12 inches
b) 15 inches
c) 18 inches
d) 24 inches
Rationale: NEC 210.52(C)(5) suggests a practical minimum of 15
inches above finished floor for countertop receptacles.
9. A habitable room requires a lighting outlet. How is this defined?
a) Only ceiling-mounted fixture
b) Only wall switch-controlled outlet
c) Any outlet that provides illumination
d) Only a ceiling fan fixture
Rationale: NEC 210.70(A)(1) requires at least one lighting outlet in
every habitable room, which can be ceiling or wall-controlled.
10. AFCI protection is required for which locations in a dwelling?
a) Kitchens
b) Bathrooms
c) Bedrooms
d) Garages
Rationale: NEC 210.12(A) requires AFCI protection for all 120V, 15-
and 20-ampere branch circuits supplying outlets in dwelling unit
bedrooms.
