RESIDENTIAL FEEDER INSPECTION
EXAMINATION WITH ACTUAL QUESTIONS
AND VERIFIED ANSWERS, PLUS
EXPLAINED RATIONALES/EXPERT
VERIFIED FOR GUARANTEED 100% PASS
2026/LATEST UPDATE/INSTANT
DOWNLOAD PDF
1. A dwelling-unit feeder supplies a 120/240-volt, single-phase
panelboard from a service equipment panel. The feeder consists of
two ungrounded conductors, one grounded conductor, and an
equipment grounding conductor. During inspection, the inspector
finds that the grounded conductor and equipment grounding
conductor are connected together in the downstream panelboard.
What is the primary concern?
A. The feeder voltage will automatically increase
B. Parallel neutral current may flow on the equipment grounding path
C. The feeder overcurrent device will become oversized
D. The grounding electrode system will become ineffective
Answer: B. Parallel neutral current may flow on the equipment
grounding path
Rationale: In a downstream panelboard supplied by a feeder, the
grounded conductor and equipment grounding conductor generally
must remain isolated. Bonding them together downstream of the
service disconnect can place normal neutral current on equipment
grounding conductors, metal enclosures, raceways, and other bonded
metallic paths. The main bonding connection belongs at the service
1
,disconnecting means or other location permitted by the applicable
installation rules.
2. A residential feeder is protected by a 100-ampere circuit breaker.
The feeder conductors are installed in a raceway and terminate on a
panelboard rated 100 amperes. Which inspection characteristic is
most important when determining whether the feeder conductors
are properly sized?
A. Only the physical diameter of the conductors
B. The conductor ampacity under the applicable conditions of use
C. The color of the insulation only
D. The length of the panelboard enclosure
Answer: B. The conductor ampacity under the applicable conditions
of use
Rationale: Feeder conductor sizing depends on ampacity after
applying applicable requirements such as temperature limitations,
adjustment and correction factors, termination ratings, and other
installation conditions. Simply comparing conductor diameter or
insulation color does not establish compliance.
3. An inspector finds a 120/240-volt feeder supplying a dwelling
panelboard. The two ungrounded conductors are connected to
opposite phases of the system. What is the primary purpose of this
arrangement?
A. To eliminate the equipment grounding conductor
B. To permit the feeder to supply both 120-volt and 240-volt loads
C. To reduce the panelboard enclosure size
D. To eliminate the grounded conductor
2
,Answer: B. To permit the feeder to supply both 120-volt and 240-
volt loads
Rationale: A typical single-phase, 120/240-volt dwelling feeder uses
two ungrounded conductors on opposite phases and a grounded
conductor. A 120-volt load connects between one ungrounded
conductor and the grounded conductor, while a 240-volt load connects
between the two ungrounded conductors.
4. During inspection of a feeder panelboard, the inspector observes
that the feeder neutral conductor is connected to the panelboard
enclosure with the bonding screw installed. The panelboard is
located downstream from the service disconnect. What should the
inspector generally conclude?
A. This is always required
B. This is generally an improper downstream neutral-to-ground bond
C. This eliminates the need for an equipment grounding conductor
D. This is required whenever the feeder exceeds 50 amperes
Answer: B. This is generally an improper downstream neutral-to-
ground bond
Rationale: At a downstream feeder panelboard, the grounded
conductor is normally isolated from the equipment grounding
conductor and enclosure. Installing the bonding screw can create
objectionable current paths through grounding and bonding
metalwork. The inspector should verify the actual system
configuration and applicable code requirements before documenting
the deficiency.
3
, 5. A residential feeder passes through an attic space where ambient
temperatures can become significantly elevated. Why might the
inspector need to consider the attic temperature?
A. Elevated temperature can affect conductor ampacity
B. Elevated temperature changes the phase sequence
C. Elevated temperature eliminates the need for overcurrent protection
D. Elevated temperature automatically increases conductor ampacity
Answer: A. Elevated temperature can affect conductor ampacity
Rationale: Conductor ampacity may need correction for ambient
temperature. Attic installations can expose conductors to temperatures
substantially different from the assumed reference conditions. The
inspector should evaluate conductor insulation rating, ambient
temperature, adjustment factors, and termination limitations as
applicable.
6. A feeder supplies a residential panelboard through a cable
assembly. The cable enters the panelboard enclosure without an
appropriate connector or listed cable clamp. What is the primary
inspection concern?
A. The cable may lack proper mechanical protection and strain relief
B. The circuit will automatically become a 240-volt circuit
C. The neutral conductor will become oversized
D. The panelboard will automatically become a service panel
Answer: A. The cable may lack proper mechanical protection and
strain relief
Rationale: Cable assemblies entering enclosures generally require an
appropriate listed connector or fitting. The connector protects the
cable from abrasion and provides mechanical retention. A loose or
4
EXAMINATION WITH ACTUAL QUESTIONS
AND VERIFIED ANSWERS, PLUS
EXPLAINED RATIONALES/EXPERT
VERIFIED FOR GUARANTEED 100% PASS
2026/LATEST UPDATE/INSTANT
DOWNLOAD PDF
1. A dwelling-unit feeder supplies a 120/240-volt, single-phase
panelboard from a service equipment panel. The feeder consists of
two ungrounded conductors, one grounded conductor, and an
equipment grounding conductor. During inspection, the inspector
finds that the grounded conductor and equipment grounding
conductor are connected together in the downstream panelboard.
What is the primary concern?
A. The feeder voltage will automatically increase
B. Parallel neutral current may flow on the equipment grounding path
C. The feeder overcurrent device will become oversized
D. The grounding electrode system will become ineffective
Answer: B. Parallel neutral current may flow on the equipment
grounding path
Rationale: In a downstream panelboard supplied by a feeder, the
grounded conductor and equipment grounding conductor generally
must remain isolated. Bonding them together downstream of the
service disconnect can place normal neutral current on equipment
grounding conductors, metal enclosures, raceways, and other bonded
metallic paths. The main bonding connection belongs at the service
1
,disconnecting means or other location permitted by the applicable
installation rules.
2. A residential feeder is protected by a 100-ampere circuit breaker.
The feeder conductors are installed in a raceway and terminate on a
panelboard rated 100 amperes. Which inspection characteristic is
most important when determining whether the feeder conductors
are properly sized?
A. Only the physical diameter of the conductors
B. The conductor ampacity under the applicable conditions of use
C. The color of the insulation only
D. The length of the panelboard enclosure
Answer: B. The conductor ampacity under the applicable conditions
of use
Rationale: Feeder conductor sizing depends on ampacity after
applying applicable requirements such as temperature limitations,
adjustment and correction factors, termination ratings, and other
installation conditions. Simply comparing conductor diameter or
insulation color does not establish compliance.
3. An inspector finds a 120/240-volt feeder supplying a dwelling
panelboard. The two ungrounded conductors are connected to
opposite phases of the system. What is the primary purpose of this
arrangement?
A. To eliminate the equipment grounding conductor
B. To permit the feeder to supply both 120-volt and 240-volt loads
C. To reduce the panelboard enclosure size
D. To eliminate the grounded conductor
2
,Answer: B. To permit the feeder to supply both 120-volt and 240-
volt loads
Rationale: A typical single-phase, 120/240-volt dwelling feeder uses
two ungrounded conductors on opposite phases and a grounded
conductor. A 120-volt load connects between one ungrounded
conductor and the grounded conductor, while a 240-volt load connects
between the two ungrounded conductors.
4. During inspection of a feeder panelboard, the inspector observes
that the feeder neutral conductor is connected to the panelboard
enclosure with the bonding screw installed. The panelboard is
located downstream from the service disconnect. What should the
inspector generally conclude?
A. This is always required
B. This is generally an improper downstream neutral-to-ground bond
C. This eliminates the need for an equipment grounding conductor
D. This is required whenever the feeder exceeds 50 amperes
Answer: B. This is generally an improper downstream neutral-to-
ground bond
Rationale: At a downstream feeder panelboard, the grounded
conductor is normally isolated from the equipment grounding
conductor and enclosure. Installing the bonding screw can create
objectionable current paths through grounding and bonding
metalwork. The inspector should verify the actual system
configuration and applicable code requirements before documenting
the deficiency.
3
, 5. A residential feeder passes through an attic space where ambient
temperatures can become significantly elevated. Why might the
inspector need to consider the attic temperature?
A. Elevated temperature can affect conductor ampacity
B. Elevated temperature changes the phase sequence
C. Elevated temperature eliminates the need for overcurrent protection
D. Elevated temperature automatically increases conductor ampacity
Answer: A. Elevated temperature can affect conductor ampacity
Rationale: Conductor ampacity may need correction for ambient
temperature. Attic installations can expose conductors to temperatures
substantially different from the assumed reference conditions. The
inspector should evaluate conductor insulation rating, ambient
temperature, adjustment factors, and termination limitations as
applicable.
6. A feeder supplies a residential panelboard through a cable
assembly. The cable enters the panelboard enclosure without an
appropriate connector or listed cable clamp. What is the primary
inspection concern?
A. The cable may lack proper mechanical protection and strain relief
B. The circuit will automatically become a 240-volt circuit
C. The neutral conductor will become oversized
D. The panelboard will automatically become a service panel
Answer: A. The cable may lack proper mechanical protection and
strain relief
Rationale: Cable assemblies entering enclosures generally require an
appropriate listed connector or fitting. The connector protects the
cable from abrasion and provides mechanical retention. A loose or
4
