RESIDENTIAL GFCI INSPECTION
EXAMINATION WITH ACTUAL QUESTIONS
AND VERIFIED ANSWERS, PLUS
EXPLAINED RATIONALES/EXPERT
VERIFIED FOR GUARANTEED 100% PASS
2026/LATEST UPDATE/INSTANT
DOWNLOAD PDF
1. What is the primary purpose of a Ground-Fault Circuit-
Interrupter (GFCI)?
A. To protect electrical equipment from overvoltage
B. To protect people from electric shock caused by current leaking to
ground
C. To prevent all electrical fires caused by short circuits
D. To regulate the voltage supplied to receptacles
Answer: B. To protect people from electric shock caused by current
leaking to ground
Rationale: A GFCI monitors the current leaving and returning
through the circuit conductors. When it detects an imbalance
indicating that some current may be flowing through an unintended
path, such as a person's body to ground, it rapidly interrupts power. It
is primarily a personnel-protection device rather than an overcurrent
or voltage-regulation device.
2. During a residential inspection, an inspector observes a GFCI
receptacle protecting a bathroom receptacle. Which condition most
directly indicates that the GFCI may not be functioning properly?
A. The receptacle has a grounding terminal
B. The receptacle cover is white
1
,C. The TEST button fails to interrupt power
D. The receptacle is installed on a 20-ampere circuit
Answer: C. The TEST button fails to interrupt power
Rationale: The TEST function is specifically provided to verify that the
GFCI sensing and tripping mechanism operates. If pressing TEST
does not cause the protected circuit to lose power, the device may be
defective, improperly wired, or otherwise unable to provide the
intended protection.
3. What electrical condition does a GFCI primarily detect?
A. Excessive current caused by an overload
B. Excessive voltage
C. An imbalance between current flowing out and current returning
D. A low-frequency electrical waveform
Answer: C. An imbalance between current flowing out and current
returning
Rationale: Under normal operation, the current flowing through the
ungrounded conductor should return through the intended grounded
conductor. A GFCI compares these currents. A difference indicates
leakage through another path, potentially including a person.
4. A residential bathroom contains a 120-volt receptacle located
within the area where a person could reasonably contact a grounded
plumbing fixture while using electrical equipment. Why is GFCI
protection particularly important?
A. Plumbing fixtures increase the possibility of an unintended current
path through a person
B. Bathrooms always contain overloaded circuits
2
,C. Plumbing fixtures increase the voltage supplied to receptacles
D. GFCIs are required only because bathrooms contain lighting fixtures
Answer: A. Plumbing fixtures increase the possibility of an
unintended current path through a person
Rationale: Bathrooms commonly contain conductive plumbing and
other grounded surfaces. A person contacting energized equipment
while simultaneously contacting a grounded surface can provide a
path for current through the body. GFCI protection is designed to
reduce the duration of such hazardous current flow.
5. Which statement best describes the difference between a circuit
breaker and a GFCI?
A. A GFCI primarily protects against overloads, while a breaker protects
against leakage
B. A breaker primarily provides overcurrent protection, while a GFCI
provides ground-fault protection
C. Both devices perform exactly the same function
D. A GFCI replaces all required circuit breakers
Answer: B. A breaker primarily provides overcurrent protection,
while a GFCI provides ground-fault protection
Rationale: Circuit breakers and GFCIs perform different protective
functions. Overcurrent protective devices respond to excessive current
associated with overloads and short circuits. GFCIs respond to current
imbalance associated with leakage to an unintended path. One should
not be assumed to replace the other.
6. An inspector presses the TEST button on a GFCI receptacle and
the device trips. What should the inspector generally do next when
conducting a functional inspection?
3
, A. Assume the entire electrical system is compliant
B. Reset the device and verify appropriate operation
C. Remove the GFCI from the wall
D. Replace the circuit breaker
Answer: B. Reset the device and verify appropriate operation
Rationale: Testing normally involves both tripping and resetting the
device. A GFCI that trips but cannot properly reset may have a defect
or wiring problem. The inspector should evaluate its operation within
the limits of the inspection standard and applicable code requirements.
7. What is the significance of a GFCI's LOAD terminals?
A. They are intended to connect downstream conductors so additional
outlets can receive GFCI protection
B. They are exclusively used for grounding conductors
C. They are designed to connect only the circuit breaker
D. They are used to increase circuit voltage
Answer: A. They are intended to connect downstream conductors so
additional outlets can receive GFCI protection
Rationale: Many GFCI receptacles have LINE and LOAD terminals.
Conductors connected to the LOAD side can provide downstream
protection when the device is properly installed. Incorrect
identification of LINE and LOAD conductors can result in improper
operation or loss of intended protection.
8. An inspector discovers that a GFCI receptacle has LINE and
LOAD conductors reversed. What is the most appropriate concern?
A. The receptacle may not function as intended
B. The receptacle will automatically increase circuit capacity
4
EXAMINATION WITH ACTUAL QUESTIONS
AND VERIFIED ANSWERS, PLUS
EXPLAINED RATIONALES/EXPERT
VERIFIED FOR GUARANTEED 100% PASS
2026/LATEST UPDATE/INSTANT
DOWNLOAD PDF
1. What is the primary purpose of a Ground-Fault Circuit-
Interrupter (GFCI)?
A. To protect electrical equipment from overvoltage
B. To protect people from electric shock caused by current leaking to
ground
C. To prevent all electrical fires caused by short circuits
D. To regulate the voltage supplied to receptacles
Answer: B. To protect people from electric shock caused by current
leaking to ground
Rationale: A GFCI monitors the current leaving and returning
through the circuit conductors. When it detects an imbalance
indicating that some current may be flowing through an unintended
path, such as a person's body to ground, it rapidly interrupts power. It
is primarily a personnel-protection device rather than an overcurrent
or voltage-regulation device.
2. During a residential inspection, an inspector observes a GFCI
receptacle protecting a bathroom receptacle. Which condition most
directly indicates that the GFCI may not be functioning properly?
A. The receptacle has a grounding terminal
B. The receptacle cover is white
1
,C. The TEST button fails to interrupt power
D. The receptacle is installed on a 20-ampere circuit
Answer: C. The TEST button fails to interrupt power
Rationale: The TEST function is specifically provided to verify that the
GFCI sensing and tripping mechanism operates. If pressing TEST
does not cause the protected circuit to lose power, the device may be
defective, improperly wired, or otherwise unable to provide the
intended protection.
3. What electrical condition does a GFCI primarily detect?
A. Excessive current caused by an overload
B. Excessive voltage
C. An imbalance between current flowing out and current returning
D. A low-frequency electrical waveform
Answer: C. An imbalance between current flowing out and current
returning
Rationale: Under normal operation, the current flowing through the
ungrounded conductor should return through the intended grounded
conductor. A GFCI compares these currents. A difference indicates
leakage through another path, potentially including a person.
4. A residential bathroom contains a 120-volt receptacle located
within the area where a person could reasonably contact a grounded
plumbing fixture while using electrical equipment. Why is GFCI
protection particularly important?
A. Plumbing fixtures increase the possibility of an unintended current
path through a person
B. Bathrooms always contain overloaded circuits
2
,C. Plumbing fixtures increase the voltage supplied to receptacles
D. GFCIs are required only because bathrooms contain lighting fixtures
Answer: A. Plumbing fixtures increase the possibility of an
unintended current path through a person
Rationale: Bathrooms commonly contain conductive plumbing and
other grounded surfaces. A person contacting energized equipment
while simultaneously contacting a grounded surface can provide a
path for current through the body. GFCI protection is designed to
reduce the duration of such hazardous current flow.
5. Which statement best describes the difference between a circuit
breaker and a GFCI?
A. A GFCI primarily protects against overloads, while a breaker protects
against leakage
B. A breaker primarily provides overcurrent protection, while a GFCI
provides ground-fault protection
C. Both devices perform exactly the same function
D. A GFCI replaces all required circuit breakers
Answer: B. A breaker primarily provides overcurrent protection,
while a GFCI provides ground-fault protection
Rationale: Circuit breakers and GFCIs perform different protective
functions. Overcurrent protective devices respond to excessive current
associated with overloads and short circuits. GFCIs respond to current
imbalance associated with leakage to an unintended path. One should
not be assumed to replace the other.
6. An inspector presses the TEST button on a GFCI receptacle and
the device trips. What should the inspector generally do next when
conducting a functional inspection?
3
, A. Assume the entire electrical system is compliant
B. Reset the device and verify appropriate operation
C. Remove the GFCI from the wall
D. Replace the circuit breaker
Answer: B. Reset the device and verify appropriate operation
Rationale: Testing normally involves both tripping and resetting the
device. A GFCI that trips but cannot properly reset may have a defect
or wiring problem. The inspector should evaluate its operation within
the limits of the inspection standard and applicable code requirements.
7. What is the significance of a GFCI's LOAD terminals?
A. They are intended to connect downstream conductors so additional
outlets can receive GFCI protection
B. They are exclusively used for grounding conductors
C. They are designed to connect only the circuit breaker
D. They are used to increase circuit voltage
Answer: A. They are intended to connect downstream conductors so
additional outlets can receive GFCI protection
Rationale: Many GFCI receptacles have LINE and LOAD terminals.
Conductors connected to the LOAD side can provide downstream
protection when the device is properly installed. Incorrect
identification of LINE and LOAD conductors can result in improper
operation or loss of intended protection.
8. An inspector discovers that a GFCI receptacle has LINE and
LOAD conductors reversed. What is the most appropriate concern?
A. The receptacle may not function as intended
B. The receptacle will automatically increase circuit capacity
4
