ICC E1 Residential Electrical Inspector
ICC Residential Electrical Inspector (E1) Exam
International Code Council — Certification Exam
Questions with Answers| Latest Update| Pass Guaranteed
Q1. What is the minimum size copper conductor generally permitted for a 15-
ampere branch circuit under the NEC?
A. 18 AWG
B. 14 AWG
C. 10 AWG
D. 6 AWG
Answer: B — 14 AWG
Rationale: 14 AWG copper is the minimum conductor size rated for a 15-ampere
general branch circuit under standard NEC ampacity tables.
Q2. What is the minimum size copper conductor generally required for a 20-
ampere branch circuit?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Answer: B — 12 AWG
Rationale: 12 AWG copper conductors are rated for 20-ampere circuits per
standard NEC ampacity requirements.
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, ICC E1 Residential Electrical Inspector
Q3. Per the NEC, what is the standard minimum height above the floor for
receptacle outlets, and are there specific requirements for readily accessible
placement?
A. There is no requirement
B. Receptacles must be readily accessible; a specific universal minimum height
is not generally mandated for standard outlets, unlike maximum height rules
for some applications
C. Exactly 12 inches for every outlet
D. Exactly 60 inches for every outlet
Answer: B — Receptacles must be readily accessible; a specific universal
minimum height is not generally mandated for standard outlets, unlike
maximum height rules for some applications
Rationale: The NEC generally requires receptacles to be readily accessible
without specifying one universal minimum mounting height for standard wall
receptacles, though specific rules apply to certain locations like countertops.
Q4. In a dwelling unit kitchen, what is the maximum spacing permitted between
countertop receptacle outlets along the wall behind a counter?
A. No spacing limit applies
B. 24 inches
C. 48 inches
D. 72 inches
Answer: C — 48 inches
Rationale: The NEC requires countertop receptacles spaced so no point along
the countertop wall line is more than 24 inches from an outlet, resulting in a
maximum 48-inch spacing between outlets.
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, ICC E1 Residential Electrical Inspector
Q5. What type of protection is required for all 125-volt, 15- and 20-ampere
receptacles installed in dwelling unit kitchens?
A. AFCI protection only
B. GFCI protection
C. No special protection required
D. Surge protection only
Answer: B — GFCI protection
Rationale: GFCI protection is required for kitchen receptacles serving countertop
surfaces (and other kitchen receptacles per current code cycles) to reduce shock
hazard near water and appliances.
Q6. In addition to GFCI, what type of protection does the NEC require for most
120-volt, 15- and 20-ampere branch circuits supplying outlets in dwelling unit
bedrooms?
A. No additional protection required
B. AFCI (Arc-Fault Circuit Interrupter) protection
C. Surge protection only
D. Only a dedicated neutral is required
Answer: B — AFCI (Arc-Fault Circuit Interrupter) protection
Rationale: AFCI protection is required for most 120-volt, 15- and 20-ampere
branch circuits supplying dwelling unit living areas, including bedrooms, to
reduce fire risk from arcing faults.
Q7. Where GFCI protection is required in a bathroom, what circuit configuration
is generally permitted for the bathroom receptacle circuit?
A. A shared circuit with unlimited other rooms only
B. A dedicated 20-ampere circuit for the bathroom(s), or a circuit supplying
only other bathroom receptacles, subject to code provisions
C. Only 15-ampere circuits are allowed
D. No GFCI protection is ever required in bathrooms
Answer: B — A dedicated 20-ampere circuit for the bathroom(s), or a circuit
supplying only other bathroom receptacles, subject to code provisions
Rationale: The NEC permits a 20-ampere circuit dedicated to bathroom
receptacle outlets, which may serve receptacles in multiple bathrooms, or supply
a single bathroom along with other loads under specific conditions.
Page 3 of 47
, ICC E1 Residential Electrical Inspector
Q8. What is the required GFCI protection for 125-volt, 15- and 20-ampere
receptacles installed outdoors at a dwelling?
A. Not required outdoors
B. Required, since outdoor receptacles present increased shock hazard from
moisture
C. Only required if within 3 feet of a door
D. Only required in swimming pool areas
Answer: B — Required, since outdoor receptacles present increased shock
hazard from moisture
Rationale: GFCI protection is required for outdoor receptacles at dwellings due
to the increased risk of ground faults in wet or damp locations.
Q9. What is the purpose of a Ground-Fault Circuit Interrupter (GFCI)?
A. To protect equipment from overcurrent
B. To detect current leakage to ground and quickly de-energize the circuit to
reduce risk of electric shock
C. To prevent electrical surges from lightning
D. To regulate voltage fluctuations
Answer: B — To detect current leakage to ground and quickly de-energize the
circuit to reduce risk of electric shock
Rationale: GFCIs monitor for small current imbalances (as low as 4-6 mA)
indicating current leaking to ground through an unintended path, such as a
person, and interrupt power to prevent shock.
Q10. What is the purpose of an Arc-Fault Circuit Interrupter (AFCI)?
A. To detect ground faults only
B. To detect dangerous arcing conditions in wiring, such as those caused by
damaged insulation, and interrupt the circuit to reduce fire risk
C. To measure voltage drop
D. To protect against lightning strikes only
Answer: B — To detect dangerous arcing conditions in wiring, such as those
caused by damaged insulation, and interrupt the circuit to reduce fire risk
Rationale: AFCIs are designed to detect the electrical signature of arcing faults,
which can ignite fires, and de-energize the circuit before ignition occurs.
Page 4 of 47
ICC Residential Electrical Inspector (E1) Exam
International Code Council — Certification Exam
Questions with Answers| Latest Update| Pass Guaranteed
Q1. What is the minimum size copper conductor generally permitted for a 15-
ampere branch circuit under the NEC?
A. 18 AWG
B. 14 AWG
C. 10 AWG
D. 6 AWG
Answer: B — 14 AWG
Rationale: 14 AWG copper is the minimum conductor size rated for a 15-ampere
general branch circuit under standard NEC ampacity tables.
Q2. What is the minimum size copper conductor generally required for a 20-
ampere branch circuit?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Answer: B — 12 AWG
Rationale: 12 AWG copper conductors are rated for 20-ampere circuits per
standard NEC ampacity requirements.
Page 1 of 47
, ICC E1 Residential Electrical Inspector
Q3. Per the NEC, what is the standard minimum height above the floor for
receptacle outlets, and are there specific requirements for readily accessible
placement?
A. There is no requirement
B. Receptacles must be readily accessible; a specific universal minimum height
is not generally mandated for standard outlets, unlike maximum height rules
for some applications
C. Exactly 12 inches for every outlet
D. Exactly 60 inches for every outlet
Answer: B — Receptacles must be readily accessible; a specific universal
minimum height is not generally mandated for standard outlets, unlike
maximum height rules for some applications
Rationale: The NEC generally requires receptacles to be readily accessible
without specifying one universal minimum mounting height for standard wall
receptacles, though specific rules apply to certain locations like countertops.
Q4. In a dwelling unit kitchen, what is the maximum spacing permitted between
countertop receptacle outlets along the wall behind a counter?
A. No spacing limit applies
B. 24 inches
C. 48 inches
D. 72 inches
Answer: C — 48 inches
Rationale: The NEC requires countertop receptacles spaced so no point along
the countertop wall line is more than 24 inches from an outlet, resulting in a
maximum 48-inch spacing between outlets.
Page 2 of 47
, ICC E1 Residential Electrical Inspector
Q5. What type of protection is required for all 125-volt, 15- and 20-ampere
receptacles installed in dwelling unit kitchens?
A. AFCI protection only
B. GFCI protection
C. No special protection required
D. Surge protection only
Answer: B — GFCI protection
Rationale: GFCI protection is required for kitchen receptacles serving countertop
surfaces (and other kitchen receptacles per current code cycles) to reduce shock
hazard near water and appliances.
Q6. In addition to GFCI, what type of protection does the NEC require for most
120-volt, 15- and 20-ampere branch circuits supplying outlets in dwelling unit
bedrooms?
A. No additional protection required
B. AFCI (Arc-Fault Circuit Interrupter) protection
C. Surge protection only
D. Only a dedicated neutral is required
Answer: B — AFCI (Arc-Fault Circuit Interrupter) protection
Rationale: AFCI protection is required for most 120-volt, 15- and 20-ampere
branch circuits supplying dwelling unit living areas, including bedrooms, to
reduce fire risk from arcing faults.
Q7. Where GFCI protection is required in a bathroom, what circuit configuration
is generally permitted for the bathroom receptacle circuit?
A. A shared circuit with unlimited other rooms only
B. A dedicated 20-ampere circuit for the bathroom(s), or a circuit supplying
only other bathroom receptacles, subject to code provisions
C. Only 15-ampere circuits are allowed
D. No GFCI protection is ever required in bathrooms
Answer: B — A dedicated 20-ampere circuit for the bathroom(s), or a circuit
supplying only other bathroom receptacles, subject to code provisions
Rationale: The NEC permits a 20-ampere circuit dedicated to bathroom
receptacle outlets, which may serve receptacles in multiple bathrooms, or supply
a single bathroom along with other loads under specific conditions.
Page 3 of 47
, ICC E1 Residential Electrical Inspector
Q8. What is the required GFCI protection for 125-volt, 15- and 20-ampere
receptacles installed outdoors at a dwelling?
A. Not required outdoors
B. Required, since outdoor receptacles present increased shock hazard from
moisture
C. Only required if within 3 feet of a door
D. Only required in swimming pool areas
Answer: B — Required, since outdoor receptacles present increased shock
hazard from moisture
Rationale: GFCI protection is required for outdoor receptacles at dwellings due
to the increased risk of ground faults in wet or damp locations.
Q9. What is the purpose of a Ground-Fault Circuit Interrupter (GFCI)?
A. To protect equipment from overcurrent
B. To detect current leakage to ground and quickly de-energize the circuit to
reduce risk of electric shock
C. To prevent electrical surges from lightning
D. To regulate voltage fluctuations
Answer: B — To detect current leakage to ground and quickly de-energize the
circuit to reduce risk of electric shock
Rationale: GFCIs monitor for small current imbalances (as low as 4-6 mA)
indicating current leaking to ground through an unintended path, such as a
person, and interrupt power to prevent shock.
Q10. What is the purpose of an Arc-Fault Circuit Interrupter (AFCI)?
A. To detect ground faults only
B. To detect dangerous arcing conditions in wiring, such as those caused by
damaged insulation, and interrupt the circuit to reduce fire risk
C. To measure voltage drop
D. To protect against lightning strikes only
Answer: B — To detect dangerous arcing conditions in wiring, such as those
caused by damaged insulation, and interrupt the circuit to reduce fire risk
Rationale: AFCIs are designed to detect the electrical signature of arcing faults,
which can ignite fires, and de-energize the circuit before ignition occurs.
Page 4 of 47
