IAEI Residential Electrical Inspector EXAM with Questions
and Answers/Plus a Rationale Updated 2026 A+/Instant
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EXAM COVERAGE - 1. General Administration and Scope - 2.
Services and Service Equipment - 3. Branch Circuit and Feeder
Requirements - 4. Wiring Methods and Power/Lighting Distribution -
5. Devices, Luminaires, and Appliances - 6. Swimming Pools, Spas,
and Special Installations
1. During a rough-in inspection of a single-family dwelling, the inspector observes 10 AWG copper
conductors installed for a 30-ampere residential branch circuit supplying a fixed electric space
heater. Is this installation compliant with the International Residential Code (IRC)?
A. Yes, because 10 AWG copper is rated for 30 amperes under standard residential ampacity
tables.
B. No, because 10 AWG copper non-sheathed wire is restricted to a maximum overcurrent
protection of 25 amperes.
C. Yes, provided the branch circuit supplies only non-continuous loads not exceeding 80% of the
conductor rating.
D. No, because standard 10 AWG copper building wire (such as type NM-B) is limited to a
30-ampere ampacity only under specific thermal conditions, but standard ampacity rules
for 60°C termination terminals limit it to 30 amperes; however, specific continuous load
rules and terminal ratings must be verified.
CORRECT ANSWER : D
Rationale: Under standard provisions, 10 AWG copper wire has a 60°C ampacity rating of 30
amperes in free air or certain applications, but terminal temperature ratings usually dictate the
allowable ampacity. While 10 AWG copper NM-B cable is commonly rated for 30 amps for
specific uses like air conditioners, branch circuits supplying continuous loads or specific fixed
appliances must carefully evaluate terminal ratings and overcurrent protection limitations.
Options A, B, and C fail to integrate terminal temperature constraints and continuous load
factors required for rigorous code enforcement.
2. An electrical inspector is evaluating a 200-ampere single-phase service installation for a new
detached one-family dwelling. The service disconnect is grouped outdoors. What is the minimum
required vertical clearance of service drop conductors passing above a residential driveway,
where the voltage to ground does not exceed 150 volts?
, A. 10 feet
B. 12 feet
C. 18 feet
D. 15 feet
CORRECT ANSWER : C
Rationale: Overhead service drop conductors passing over residential driveways, subject to
truck traffic or general vehicular access, must maintain a minimum vertical clearance of 18 feet
above finished grade to ensure safe clearance for high-profile vehicles. A clearance of 10 feet is
permitted only for pedestrian-only walkways, while 12 feet is designated for residential property
driveways subject to traffic limited to vehicles under 8 feet in height under specific utility rules,
but the baseline code rule for driveways on residential and commercial properties carrying
vehicle traffic specifies higher thresholds depending on voltage. Option C aligns with standard
overhead clearance mandates crossing driveways.
3. When inspecting a newly installed 120/240-volt, single-phase residential service panel, the
electrical inspector notices that the neutral conductor is bonded to the service enclosure and a
grounding electrode conductor is connected to a ground rod. The homeowner has also run a
separate metallic water pipe bond. Which condition mandates an additional grounding electrode?
A. A ground rod is sufficient; no other electrodes are ever required for residential services.
B. A metal underground water pipe in direct contact with the earth for 10 feet or more
must always be supplemented by an additional electrode, such as a ground rod or concrete-
encased electrode.
C. Concrete-encased electrodes are strictly optional and can never replace a ground rod.
D. The metallic water pipe acts as a bonding jumper, not an electrode, so it cannot be counted.
CORRECT ANSWER : B
Rationale: Under the IRC and NEC provisions governing grounding, a metal underground water
pipe that is metered and contacts the earth for 10 feet or more is considered a grounding
electrode but must always be supplemented by an additional electrode (such as a concrete-
encased electrode, ground rod, or plate electrode). Option A is false because single ground rods
often require supplementation unless meeting low-resistance exceptions. Option C and D
misinterpret the dual role of metallic water piping systems.
4. An inspector checks a kitchen multiwire branch circuit serving countertop receptacles in a
residential dwelling. The circuit utilizes a 12/3 NM-B cable with a shared neutral. Does the IRC
require a specific means of disconnect at the panelboard for this configuration?
, A. No disconnect means is necessary beyond standard single-pole breakers.
B. Yes, a simultaneous disconnect (such as a 2-pole common-trip breaker or approved
handle tie) must open all ungrounded conductors at the panelboard where the multiwire
branch circuit originates.
C. Only a handle tie is permitted; common-trip breakers are prohibited on multiwire branch
circuits.
D. The shared neutral must have an independent toggle switch inside the kitchen area.
CORRECT ANSWER : B
Rationale: Multiwire branch circuits supplying devices or equipment on the same premises must
provide a means to simultaneously disconnect all ungrounded conductors at the panelboard
where the branch circuit originates. This safety requirement prevents electrical shock hazards to
technicians working on one leg while the other remains energized. Options A, C, and D propose
unsafe or incorrect isolation methods.
5. An inspector is reviewing the physical protection of NM cable installed in an unfinished
basement. The 12/2 cable runs parallel to the bottom face of basement ceiling joists. Is running
the cable unprotected along the bottom of the joists compliant?
A. Yes, cables running parallel to the bottom of ceiling joists are considered protected by
the framing members and do not require additional running boards.
B. No, all NM cables in unfinished basements must be enclosed in rigid metal conduit regardless
of location.
C. Yes, but only if protected by running boards spaced every 24 inches.
D. No, NM cables can never be exposed in basements under any circumstances.
CORRECT ANSWER : A
Rationale: Cables of type NM smaller than two 6aler or larger sizes run parallel to the sides or
faces of framing members (such as bottom edges of basement joists) are considered protected by
the structural elements of the building. Running boards or running conduits are only strictly
required when cables are surface-mounted across open spans where they are susceptible to
physical damage. Options B, C, and D misstate standard wiring method installation allowances.
6. What is the minimum size copper grounding electrode conductor required for a 200-ampere
residential service supplied by 2/0 AWG copper ungrounded service-entrance conductors, when
utilizing a made electrode such as a single ground rod?
A. 8 AWG copper
, B. 6 AWG copper
C. 4 AWG copper
D. 2 AWG copper
CORRECT ANSWER : B
Rationale: According to the grounding electrode conductor sizing tables in the code, when a
copper grounding electrode conductor is connected solely to a rod, pipe, or plate electrode, the
copper GEC is never required to be larger than 6 AWG, regardless of the service-entrance
conductor ampacity. Options A, C, and D misapply sizing factors by either undersizing below the
absolute mechanical minimum or incorrectly scaling it up to match the ungrounded service
conductors.
7. During an inspection of a newly constructed single-family dwelling, the inspector finds a
receptacle installed face-up in the kitchen countertop. Is this installation acceptable?
A. Yes, provided it is a tamper-resistant receptacle.
B. Yes, if it is protected by a dedicated GFCI breaker.
C. No, receptacle outlets shall not be installed in a face-up position in work surfaces or
countertops.
D. No, unless it is a heavy-duty commercial grade twist-lock receptacle.
CORRECT ANSWER : C
Rationale: The code explicitly prohibits installing receptacles in a face-up position in
countertops or similar work surfaces because liquids, debris, and foreign objects can easily fall
into the slots, creating severe shock and fire hazards. Options A, B, and D incorrectly assume
that special protection types mitigate the inherent structural hazard of face-up countertop
orientations.
8. An electrical inspector is verifying the sizing of a residential dwelling service using the standard
calculation method. The total adjusted floor area of the living space is 2,500 square feet. What is
the minimum general lighting load required for this area?
A. 3,000 volt-amperes
B. 7,500 volt-amperes
C. 5,000 volt-amperes
D. 10,000 volt-amperes
and Answers/Plus a Rationale Updated 2026 A+/Instant
Download PDF
EXAM COVERAGE - 1. General Administration and Scope - 2.
Services and Service Equipment - 3. Branch Circuit and Feeder
Requirements - 4. Wiring Methods and Power/Lighting Distribution -
5. Devices, Luminaires, and Appliances - 6. Swimming Pools, Spas,
and Special Installations
1. During a rough-in inspection of a single-family dwelling, the inspector observes 10 AWG copper
conductors installed for a 30-ampere residential branch circuit supplying a fixed electric space
heater. Is this installation compliant with the International Residential Code (IRC)?
A. Yes, because 10 AWG copper is rated for 30 amperes under standard residential ampacity
tables.
B. No, because 10 AWG copper non-sheathed wire is restricted to a maximum overcurrent
protection of 25 amperes.
C. Yes, provided the branch circuit supplies only non-continuous loads not exceeding 80% of the
conductor rating.
D. No, because standard 10 AWG copper building wire (such as type NM-B) is limited to a
30-ampere ampacity only under specific thermal conditions, but standard ampacity rules
for 60°C termination terminals limit it to 30 amperes; however, specific continuous load
rules and terminal ratings must be verified.
CORRECT ANSWER : D
Rationale: Under standard provisions, 10 AWG copper wire has a 60°C ampacity rating of 30
amperes in free air or certain applications, but terminal temperature ratings usually dictate the
allowable ampacity. While 10 AWG copper NM-B cable is commonly rated for 30 amps for
specific uses like air conditioners, branch circuits supplying continuous loads or specific fixed
appliances must carefully evaluate terminal ratings and overcurrent protection limitations.
Options A, B, and C fail to integrate terminal temperature constraints and continuous load
factors required for rigorous code enforcement.
2. An electrical inspector is evaluating a 200-ampere single-phase service installation for a new
detached one-family dwelling. The service disconnect is grouped outdoors. What is the minimum
required vertical clearance of service drop conductors passing above a residential driveway,
where the voltage to ground does not exceed 150 volts?
, A. 10 feet
B. 12 feet
C. 18 feet
D. 15 feet
CORRECT ANSWER : C
Rationale: Overhead service drop conductors passing over residential driveways, subject to
truck traffic or general vehicular access, must maintain a minimum vertical clearance of 18 feet
above finished grade to ensure safe clearance for high-profile vehicles. A clearance of 10 feet is
permitted only for pedestrian-only walkways, while 12 feet is designated for residential property
driveways subject to traffic limited to vehicles under 8 feet in height under specific utility rules,
but the baseline code rule for driveways on residential and commercial properties carrying
vehicle traffic specifies higher thresholds depending on voltage. Option C aligns with standard
overhead clearance mandates crossing driveways.
3. When inspecting a newly installed 120/240-volt, single-phase residential service panel, the
electrical inspector notices that the neutral conductor is bonded to the service enclosure and a
grounding electrode conductor is connected to a ground rod. The homeowner has also run a
separate metallic water pipe bond. Which condition mandates an additional grounding electrode?
A. A ground rod is sufficient; no other electrodes are ever required for residential services.
B. A metal underground water pipe in direct contact with the earth for 10 feet or more
must always be supplemented by an additional electrode, such as a ground rod or concrete-
encased electrode.
C. Concrete-encased electrodes are strictly optional and can never replace a ground rod.
D. The metallic water pipe acts as a bonding jumper, not an electrode, so it cannot be counted.
CORRECT ANSWER : B
Rationale: Under the IRC and NEC provisions governing grounding, a metal underground water
pipe that is metered and contacts the earth for 10 feet or more is considered a grounding
electrode but must always be supplemented by an additional electrode (such as a concrete-
encased electrode, ground rod, or plate electrode). Option A is false because single ground rods
often require supplementation unless meeting low-resistance exceptions. Option C and D
misinterpret the dual role of metallic water piping systems.
4. An inspector checks a kitchen multiwire branch circuit serving countertop receptacles in a
residential dwelling. The circuit utilizes a 12/3 NM-B cable with a shared neutral. Does the IRC
require a specific means of disconnect at the panelboard for this configuration?
, A. No disconnect means is necessary beyond standard single-pole breakers.
B. Yes, a simultaneous disconnect (such as a 2-pole common-trip breaker or approved
handle tie) must open all ungrounded conductors at the panelboard where the multiwire
branch circuit originates.
C. Only a handle tie is permitted; common-trip breakers are prohibited on multiwire branch
circuits.
D. The shared neutral must have an independent toggle switch inside the kitchen area.
CORRECT ANSWER : B
Rationale: Multiwire branch circuits supplying devices or equipment on the same premises must
provide a means to simultaneously disconnect all ungrounded conductors at the panelboard
where the branch circuit originates. This safety requirement prevents electrical shock hazards to
technicians working on one leg while the other remains energized. Options A, C, and D propose
unsafe or incorrect isolation methods.
5. An inspector is reviewing the physical protection of NM cable installed in an unfinished
basement. The 12/2 cable runs parallel to the bottom face of basement ceiling joists. Is running
the cable unprotected along the bottom of the joists compliant?
A. Yes, cables running parallel to the bottom of ceiling joists are considered protected by
the framing members and do not require additional running boards.
B. No, all NM cables in unfinished basements must be enclosed in rigid metal conduit regardless
of location.
C. Yes, but only if protected by running boards spaced every 24 inches.
D. No, NM cables can never be exposed in basements under any circumstances.
CORRECT ANSWER : A
Rationale: Cables of type NM smaller than two 6aler or larger sizes run parallel to the sides or
faces of framing members (such as bottom edges of basement joists) are considered protected by
the structural elements of the building. Running boards or running conduits are only strictly
required when cables are surface-mounted across open spans where they are susceptible to
physical damage. Options B, C, and D misstate standard wiring method installation allowances.
6. What is the minimum size copper grounding electrode conductor required for a 200-ampere
residential service supplied by 2/0 AWG copper ungrounded service-entrance conductors, when
utilizing a made electrode such as a single ground rod?
A. 8 AWG copper
, B. 6 AWG copper
C. 4 AWG copper
D. 2 AWG copper
CORRECT ANSWER : B
Rationale: According to the grounding electrode conductor sizing tables in the code, when a
copper grounding electrode conductor is connected solely to a rod, pipe, or plate electrode, the
copper GEC is never required to be larger than 6 AWG, regardless of the service-entrance
conductor ampacity. Options A, C, and D misapply sizing factors by either undersizing below the
absolute mechanical minimum or incorrectly scaling it up to match the ungrounded service
conductors.
7. During an inspection of a newly constructed single-family dwelling, the inspector finds a
receptacle installed face-up in the kitchen countertop. Is this installation acceptable?
A. Yes, provided it is a tamper-resistant receptacle.
B. Yes, if it is protected by a dedicated GFCI breaker.
C. No, receptacle outlets shall not be installed in a face-up position in work surfaces or
countertops.
D. No, unless it is a heavy-duty commercial grade twist-lock receptacle.
CORRECT ANSWER : C
Rationale: The code explicitly prohibits installing receptacles in a face-up position in
countertops or similar work surfaces because liquids, debris, and foreign objects can easily fall
into the slots, creating severe shock and fire hazards. Options A, B, and D incorrectly assume
that special protection types mitigate the inherent structural hazard of face-up countertop
orientations.
8. An electrical inspector is verifying the sizing of a residential dwelling service using the standard
calculation method. The total adjusted floor area of the living space is 2,500 square feet. What is
the minimum general lighting load required for this area?
A. 3,000 volt-amperes
B. 7,500 volt-amperes
C. 5,000 volt-amperes
D. 10,000 volt-amperes
