ICC E1 Residential Electrical Inspector
Examination Practice Questions And
Correct Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
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1. Which of the following is the minimum required working space in front
of an electrical panel?
A. 24 inches
B. 30 inches
C. 36 inches
D. 42 inches
B. 30 inches
Rationale: NEC 110.26 requires a minimum of 30 inches of clear
working space in front of electrical panels.
,2. What is the maximum number of 15-ampere branch circuits allowed
on a single neutral wire in a multiwire branch circuit?
A. 1
B. 2
C. 3
D. 4
B. 2
Rationale: Multiwire branch circuits share a neutral between two
ungrounded conductors of opposite phase; only two circuits are
permitted per neutral.
3. Which of the following materials is not permitted for residential
grounding electrodes?
A. Copper
B. Galvanized steel
C. Aluminum
D. Concrete-encased electrode
C. Aluminum
Rationale: NEC 250.52 prohibits aluminum as a grounding electrode
material due to corrosion and conductivity concerns.
4. The minimum size grounding electrode conductor for a 100-ampere
service using copper is:
A. 6 AWG
B. 8 AWG
, C. 4 AWG
D. 2 AWG
A. 6 AWG
Rationale: NEC 250.66 specifies a 6 AWG copper conductor as the
minimum for 100-ampere service.
5. What is the maximum height for a receptacle outlet in a dwelling’s
bathroom from the finished floor?
A. 36 inches
B. 48 inches
C. No maximum height
D. 42 inches
C. No maximum height
Rationale: NEC does not specify a maximum height for receptacle
outlets in bathrooms, only location requirements.
6. AFCI protection is required in which of the following areas?
A. Kitchen countertops
B. Garage
C. Living rooms
D. Basements with equipment only
C. Living rooms
Rationale: NEC 210.12(A) requires AFCI protection in all dwelling unit
bedrooms, living rooms, dining rooms, and similar areas.
, 7. What is the minimum depth a 120V, 20-ampere receptacle must be
recessed when installed outdoors?
A. Flush with surface
B. 1 inch
C. 2 inches
D. It must be in a weatherproof box
D. It must be in a weatherproof box
Rationale: NEC 406.9(B) requires outdoor receptacles to be installed
in weatherproof enclosures.
8. The maximum length of NM cable supported horizontally between
supports is:
A. 2 feet
B. 4.5 feet
C. 6 feet
D. 8 feet
C. 4.5 feet
Rationale: NEC 334.30 requires nonmetallic-sheathed cable to be
supported at intervals not exceeding 4.5 feet.
9. What is the required minimum distance between a ceiling-mounted
lighting outlet and the top of a shower stall?
A. 6 feet
B. 7 feet
C. 8 feet
Examination Practice Questions And
Correct Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
1. Which of the following is the minimum required working space in front
of an electrical panel?
A. 24 inches
B. 30 inches
C. 36 inches
D. 42 inches
B. 30 inches
Rationale: NEC 110.26 requires a minimum of 30 inches of clear
working space in front of electrical panels.
,2. What is the maximum number of 15-ampere branch circuits allowed
on a single neutral wire in a multiwire branch circuit?
A. 1
B. 2
C. 3
D. 4
B. 2
Rationale: Multiwire branch circuits share a neutral between two
ungrounded conductors of opposite phase; only two circuits are
permitted per neutral.
3. Which of the following materials is not permitted for residential
grounding electrodes?
A. Copper
B. Galvanized steel
C. Aluminum
D. Concrete-encased electrode
C. Aluminum
Rationale: NEC 250.52 prohibits aluminum as a grounding electrode
material due to corrosion and conductivity concerns.
4. The minimum size grounding electrode conductor for a 100-ampere
service using copper is:
A. 6 AWG
B. 8 AWG
, C. 4 AWG
D. 2 AWG
A. 6 AWG
Rationale: NEC 250.66 specifies a 6 AWG copper conductor as the
minimum for 100-ampere service.
5. What is the maximum height for a receptacle outlet in a dwelling’s
bathroom from the finished floor?
A. 36 inches
B. 48 inches
C. No maximum height
D. 42 inches
C. No maximum height
Rationale: NEC does not specify a maximum height for receptacle
outlets in bathrooms, only location requirements.
6. AFCI protection is required in which of the following areas?
A. Kitchen countertops
B. Garage
C. Living rooms
D. Basements with equipment only
C. Living rooms
Rationale: NEC 210.12(A) requires AFCI protection in all dwelling unit
bedrooms, living rooms, dining rooms, and similar areas.
, 7. What is the minimum depth a 120V, 20-ampere receptacle must be
recessed when installed outdoors?
A. Flush with surface
B. 1 inch
C. 2 inches
D. It must be in a weatherproof box
D. It must be in a weatherproof box
Rationale: NEC 406.9(B) requires outdoor receptacles to be installed
in weatherproof enclosures.
8. The maximum length of NM cable supported horizontally between
supports is:
A. 2 feet
B. 4.5 feet
C. 6 feet
D. 8 feet
C. 4.5 feet
Rationale: NEC 334.30 requires nonmetallic-sheathed cable to be
supported at intervals not exceeding 4.5 feet.
9. What is the required minimum distance between a ceiling-mounted
lighting outlet and the top of a shower stall?
A. 6 feet
B. 7 feet
C. 8 feet
