ICC Residential Electrical Inspector (E1)
Practice Examination Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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Question 1
A grounded conductor, also known as a neutral conductor, is typically identified by
which color insulation in a residential branch circuit?
A) Green
B) Bare copper
C) White or natural gray
D) Black or red
Correct Answer: C
Rationale: The grounded conductor (neutral) must be identified by a white or
natural gray color. Green or bare copper is reserved for the equipment grounding
conductor. Black and red are commonly used for ungrounded (hot) conductors.
Question 2
Two grounding rods used in one grounding electrode system must be located at
least how many feet apart?
A) 4 feet
B) 6 feet
C) 8 feet
D) 10 feet
Correct Answer: B
Rationale: When two or more grounding electrodes are used, they must be spaced
,at least 6 feet apart. This distance helps ensure the resistance area of each
electrode does not overlap significantly, maximizing their effectiveness in
dissipating electrical energy into the earth.
Question 3
Which branch circuit is required to be provided for a residential laundry room?
A) 15-ampere circuit
B) 20-ampere circuit
C) 30-ampere circuit
D) Dedicated 15-ampere circuit
Correct Answer: B
Rationale: A minimum of one 20-ampere branch circuit is required to supply the
laundry receptacle outlet(s). This circuit is dedicated to the laundry area.
Question 4
When installing Type NM-B (Romex) cable through a wood stud, what is the
minimum distance the cable must be from the face of the stud, or what protection
must be provided?
A) 1 inch
B) 1 ¼ inches
C) 2 inches
D) ½ inch
Correct Answer: B
Rationale: Cables, such as NM-B, installed in a stud cavity must be kept at least 1
¼ inches from the nearest edge of the framing member. If this cannot be achieved,
a steel nail plate at least 1/16 inch thick must be installed to protect the cable
from potential damage from nails or screws.
Question 5
The minimum vertical clearance of a service drop conductor over a residential
driveway is:
A) 10 feet
B) 12 feet
,C) 15 feet
D) 18 feet
Correct Answer: B
Rationale: Overhead service conductors must maintain a minimum vertical
clearance of 12 feet over a driveway. This provides adequate clearance for
vehicles.
Question 6
The maximum overcurrent protection device rating permitted for a branch circuit
using 14 AWG copper conductors is:
A) 10 amperes
B) 15 amperes
C) 20 amperes
D) 25 amperes
Correct Answer: B
Rationale: The ampacity of 14 AWG copper conductors is 15 amperes. The
overcurrent protection device must not exceed this ampacity to protect the wiring
from overheating.
Question 7
Which of the following must be installed in a new residential bathroom?
A) AFCI Protection
B) GFCI Protection
C) Both AFCI and GFCI Protection
D) Surge Protection
Correct Answer: C
Rationale: All 120-volt branch circuits supplying outlets in a bathroom must be
GFCI-protected. Additionally, AFCIs are required for branch circuits supplying
outlets in dwelling unit bathrooms (with specific exceptions). Therefore, both
protections are typically required.
Question 8
The electrical inspector's authority to enter a premises for inspection is generally
, granted by:
A) The homeowner's verbal permission
B) A warrant
C) The code provisions
D) The building official's fee schedule
Correct Answer: C
Rationale: The applicable code (like the IRC) grants the authority having
jurisdiction (AHJ), which includes the inspector, the right to enter and inspect
premises during reasonable hours to enforce the code provisions.
Question 9
In a multi-wire branch circuit (MWBC), what is required to ensure the shared
neutral is de-energized during maintenance?
A) A common trip breaker or a handle tie on a two-pole breaker
B) Separate single-pole breakers
C) A lockout device on the neutral
D) A separate neutral for each hot conductor
Correct Answer: A
Rationale: A MWBC that shares a neutral must have a means to simultaneously
disconnect all ungrounded conductors. This is typically achieved with a two-pole
circuit breaker with a common trip or handle ties.
Question 10
Receptacles located more than how many feet above the floor are NOT required
to be tamper-resistant?
A) 4 ½ feet
B) 5 ½ feet
C) 6 feet
D) 6 ½ feet
Correct Answer: B
Rationale: The requirement for tamper-resistant receptacles (TRRs) typically
Practice Examination Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
Question 1
A grounded conductor, also known as a neutral conductor, is typically identified by
which color insulation in a residential branch circuit?
A) Green
B) Bare copper
C) White or natural gray
D) Black or red
Correct Answer: C
Rationale: The grounded conductor (neutral) must be identified by a white or
natural gray color. Green or bare copper is reserved for the equipment grounding
conductor. Black and red are commonly used for ungrounded (hot) conductors.
Question 2
Two grounding rods used in one grounding electrode system must be located at
least how many feet apart?
A) 4 feet
B) 6 feet
C) 8 feet
D) 10 feet
Correct Answer: B
Rationale: When two or more grounding electrodes are used, they must be spaced
,at least 6 feet apart. This distance helps ensure the resistance area of each
electrode does not overlap significantly, maximizing their effectiveness in
dissipating electrical energy into the earth.
Question 3
Which branch circuit is required to be provided for a residential laundry room?
A) 15-ampere circuit
B) 20-ampere circuit
C) 30-ampere circuit
D) Dedicated 15-ampere circuit
Correct Answer: B
Rationale: A minimum of one 20-ampere branch circuit is required to supply the
laundry receptacle outlet(s). This circuit is dedicated to the laundry area.
Question 4
When installing Type NM-B (Romex) cable through a wood stud, what is the
minimum distance the cable must be from the face of the stud, or what protection
must be provided?
A) 1 inch
B) 1 ¼ inches
C) 2 inches
D) ½ inch
Correct Answer: B
Rationale: Cables, such as NM-B, installed in a stud cavity must be kept at least 1
¼ inches from the nearest edge of the framing member. If this cannot be achieved,
a steel nail plate at least 1/16 inch thick must be installed to protect the cable
from potential damage from nails or screws.
Question 5
The minimum vertical clearance of a service drop conductor over a residential
driveway is:
A) 10 feet
B) 12 feet
,C) 15 feet
D) 18 feet
Correct Answer: B
Rationale: Overhead service conductors must maintain a minimum vertical
clearance of 12 feet over a driveway. This provides adequate clearance for
vehicles.
Question 6
The maximum overcurrent protection device rating permitted for a branch circuit
using 14 AWG copper conductors is:
A) 10 amperes
B) 15 amperes
C) 20 amperes
D) 25 amperes
Correct Answer: B
Rationale: The ampacity of 14 AWG copper conductors is 15 amperes. The
overcurrent protection device must not exceed this ampacity to protect the wiring
from overheating.
Question 7
Which of the following must be installed in a new residential bathroom?
A) AFCI Protection
B) GFCI Protection
C) Both AFCI and GFCI Protection
D) Surge Protection
Correct Answer: C
Rationale: All 120-volt branch circuits supplying outlets in a bathroom must be
GFCI-protected. Additionally, AFCIs are required for branch circuits supplying
outlets in dwelling unit bathrooms (with specific exceptions). Therefore, both
protections are typically required.
Question 8
The electrical inspector's authority to enter a premises for inspection is generally
, granted by:
A) The homeowner's verbal permission
B) A warrant
C) The code provisions
D) The building official's fee schedule
Correct Answer: C
Rationale: The applicable code (like the IRC) grants the authority having
jurisdiction (AHJ), which includes the inspector, the right to enter and inspect
premises during reasonable hours to enforce the code provisions.
Question 9
In a multi-wire branch circuit (MWBC), what is required to ensure the shared
neutral is de-energized during maintenance?
A) A common trip breaker or a handle tie on a two-pole breaker
B) Separate single-pole breakers
C) A lockout device on the neutral
D) A separate neutral for each hot conductor
Correct Answer: A
Rationale: A MWBC that shares a neutral must have a means to simultaneously
disconnect all ungrounded conductors. This is typically achieved with a two-pole
circuit breaker with a common trip or handle ties.
Question 10
Receptacles located more than how many feet above the floor are NOT required
to be tamper-resistant?
A) 4 ½ feet
B) 5 ½ feet
C) 6 feet
D) 6 ½ feet
Correct Answer: B
Rationale: The requirement for tamper-resistant receptacles (TRRs) typically
