IAEI Electrical Inspector Recertification
Examination Practice Questions And
Correct Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
Pdf
1. What is the minimum size copper grounding electrode conductor for a
100-amp residential service?
a) 8 AWG
b) 6 AWG
c) 4 AWG
d) 2 AWG
Rationale: According to the NEC, Table 250.66, a 100-amp service
requires a minimum 6 AWG copper grounding electrode conductor.
,2. Which type of overcurrent protection is required for a 20-amp branch
circuit supplying a single receptacle in a dwelling?
a) 15-amp fuse
b) 30-amp breaker
c) 20-amp breaker
d) 25-amp fuse
Rationale: NEC 210.21(B)(1) specifies that branch circuits must have
overcurrent protection matching the conductor ampacity; a single
20-amp circuit requires a 20-amp breaker.
3. What is the maximum number of 12 AWG general-purpose conductors
allowed in a 3/4-inch EMT conduit?
a) 6
b) 7
c) 8
d) 9
Rationale: NEC Chapter 9, Table 1, and Annex C allow 8 conductors of
12 AWG in 3/4-inch EMT using the conduit fill calculation of 40% for
more than two conductors.
4. When must arc-fault circuit interrupters (AFCIs) be installed in a
dwelling?
a) Only in kitchens
, b) In all dwelling unit bedrooms
c) Only in bathrooms
d) Only in garages
Rationale: NEC 210.12(A) requires AFCIs in all dwelling unit bedrooms
to protect against fires caused by arcing faults.
5. What is the minimum height above finished grade for outdoor
receptacles on residential properties?
a) 12 inches
b) 18 inches
c) 6 inches
d) 24 inches
Rationale: NEC 210.52(E)(1) specifies that outdoor receptacles should
be installed not less than 6 inches above finished grade.
6. Which type of wiring method is allowed in damp or wet locations?
a) NM cable
b) UF cable
c) Type AC cable
d) Nonmetallic tubing (NM tubing)
Rationale: NEC 334.12(B)(4) allows UF cable to be installed in wet or
damp locations, while NM cable is limited to dry locations.
, 7. What is the maximum length of flexible cord connected to a motor
less than 1 HP in a dwelling?
a) 6 feet
b) 12 feet
c) 15 feet
d) 20 feet
Rationale: NEC 400.8 and 430.22(C) allow a maximum of 15 feet of
flexible cord for small motors in dwellings.
8. What is the proper location for a grounding electrode for a detached
structure?
a) Any nearby metal pipe
b) Any metallic water pipe inside the structure
c) A rod or plate electrode at the detached structure
d) Only the service grounding electrode
Rationale: NEC 250.32(A) requires that a separate building or
structure have its own grounding electrode, connected to the
building disconnect.
9. Which device is required for a pool receptacle within 20 feet of the
water’s edge?
Examination Practice Questions And
Correct Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
1. What is the minimum size copper grounding electrode conductor for a
100-amp residential service?
a) 8 AWG
b) 6 AWG
c) 4 AWG
d) 2 AWG
Rationale: According to the NEC, Table 250.66, a 100-amp service
requires a minimum 6 AWG copper grounding electrode conductor.
,2. Which type of overcurrent protection is required for a 20-amp branch
circuit supplying a single receptacle in a dwelling?
a) 15-amp fuse
b) 30-amp breaker
c) 20-amp breaker
d) 25-amp fuse
Rationale: NEC 210.21(B)(1) specifies that branch circuits must have
overcurrent protection matching the conductor ampacity; a single
20-amp circuit requires a 20-amp breaker.
3. What is the maximum number of 12 AWG general-purpose conductors
allowed in a 3/4-inch EMT conduit?
a) 6
b) 7
c) 8
d) 9
Rationale: NEC Chapter 9, Table 1, and Annex C allow 8 conductors of
12 AWG in 3/4-inch EMT using the conduit fill calculation of 40% for
more than two conductors.
4. When must arc-fault circuit interrupters (AFCIs) be installed in a
dwelling?
a) Only in kitchens
, b) In all dwelling unit bedrooms
c) Only in bathrooms
d) Only in garages
Rationale: NEC 210.12(A) requires AFCIs in all dwelling unit bedrooms
to protect against fires caused by arcing faults.
5. What is the minimum height above finished grade for outdoor
receptacles on residential properties?
a) 12 inches
b) 18 inches
c) 6 inches
d) 24 inches
Rationale: NEC 210.52(E)(1) specifies that outdoor receptacles should
be installed not less than 6 inches above finished grade.
6. Which type of wiring method is allowed in damp or wet locations?
a) NM cable
b) UF cable
c) Type AC cable
d) Nonmetallic tubing (NM tubing)
Rationale: NEC 334.12(B)(4) allows UF cable to be installed in wet or
damp locations, while NM cable is limited to dry locations.
, 7. What is the maximum length of flexible cord connected to a motor
less than 1 HP in a dwelling?
a) 6 feet
b) 12 feet
c) 15 feet
d) 20 feet
Rationale: NEC 400.8 and 430.22(C) allow a maximum of 15 feet of
flexible cord for small motors in dwellings.
8. What is the proper location for a grounding electrode for a detached
structure?
a) Any nearby metal pipe
b) Any metallic water pipe inside the structure
c) A rod or plate electrode at the detached structure
d) Only the service grounding electrode
Rationale: NEC 250.32(A) requires that a separate building or
structure have its own grounding electrode, connected to the
building disconnect.
9. Which device is required for a pool receptacle within 20 feet of the
water’s edge?
