ICC Residential Electrical Inspector Exam
(E1) Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. What is the minimum size copper conductor permitted for a 20-amp
branch circuit supplying general lighting in a dwelling unit?
A. 12 AWG
B. 14 AWG
C. 10 AWG
D. 16 AWG
Rationale: According to the NEC 210.19(A)(1), 14 AWG copper is the
minimum size for 15-amp circuits; for 20-amp circuits, 12 AWG is
required. Since 20-amp is specified, the minimum size must actually
be 12 AWG.
,2. Which of the following is required for receptacle outlets in
bathrooms?
A. AFCI protection
B. GFCI protection
C. Surge protection
D. No protection required
Rationale: NEC 210.8(A) requires all bathroom receptacles to have
ground-fault circuit interrupter (GFCI) protection to prevent shock
hazards.
3. The maximum number of 12 AWG copper conductors allowed in a 3/4-
inch EMT conduit is:
A. 5
B. 8
C. 9
D. 10
Rationale: NEC Chapter 9, Table 1, shows the allowable number of 12
AWG conductors in EMT. With 3/4-inch EMT, 10 conductors are
permitted with proper derating.
4. In a dwelling unit, the minimum branch-circuit rating for kitchen
countertop receptacles is:
A. 15 amps
B. 20 amps
C. 30 amps
, D. 10 amps
Rationale: NEC 210.11(C)(1) requires at least two 20-amp small
appliance branch circuits for kitchen countertops to ensure safe
operation of appliances.
5. How deep must a 120-volt underground service lateral be installed in
residential areas?
A. 12 inches
B. 18 inches
C. 24 inches
D. 30 inches
Rationale: NEC 300.5 specifies that 120V branch circuits in residential
areas must be buried at a minimum of 24 inches to avoid accidental
contact.
6. What is the maximum allowable voltage drop recommended for
feeder and branch circuits in a dwelling?
A. 1%
B. 2%
C. 3%
D. 5%
Rationale: NEC Handbook recommends a 3% maximum voltage drop
for feeders and branch circuits to ensure efficient operation of
electrical equipment.
, 7. When installing a receptacle outdoors, which type of enclosure is
required?
A. NEMA 1
B. Weather-resistant
C. NEMA 4
D. NEMA 12
Rationale: NEC 406.9(B) requires outdoor receptacles to have
weather-resistant covers to prevent water intrusion.
8. What type of cable is typically used for interior residential wiring?
A. MC
B. SE
C. NM-B
D. UF
Rationale: NM-B (non-metallic sheathed cable) is commonly used for
interior residential wiring according to NEC 334.
9. How far must receptacles be spaced along a kitchen countertop?
A. Every 6 feet
B. Every 3 feet
C. Every 4 feet
D. Every 5 feet
Rationale: NEC 210.52(C)(1) requires countertop receptacles to be
installed so that no point along the countertop is more than 24
inches from a receptacle, effectively spacing them every 4 feet.
(E1) Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What is the minimum size copper conductor permitted for a 20-amp
branch circuit supplying general lighting in a dwelling unit?
A. 12 AWG
B. 14 AWG
C. 10 AWG
D. 16 AWG
Rationale: According to the NEC 210.19(A)(1), 14 AWG copper is the
minimum size for 15-amp circuits; for 20-amp circuits, 12 AWG is
required. Since 20-amp is specified, the minimum size must actually
be 12 AWG.
,2. Which of the following is required for receptacle outlets in
bathrooms?
A. AFCI protection
B. GFCI protection
C. Surge protection
D. No protection required
Rationale: NEC 210.8(A) requires all bathroom receptacles to have
ground-fault circuit interrupter (GFCI) protection to prevent shock
hazards.
3. The maximum number of 12 AWG copper conductors allowed in a 3/4-
inch EMT conduit is:
A. 5
B. 8
C. 9
D. 10
Rationale: NEC Chapter 9, Table 1, shows the allowable number of 12
AWG conductors in EMT. With 3/4-inch EMT, 10 conductors are
permitted with proper derating.
4. In a dwelling unit, the minimum branch-circuit rating for kitchen
countertop receptacles is:
A. 15 amps
B. 20 amps
C. 30 amps
, D. 10 amps
Rationale: NEC 210.11(C)(1) requires at least two 20-amp small
appliance branch circuits for kitchen countertops to ensure safe
operation of appliances.
5. How deep must a 120-volt underground service lateral be installed in
residential areas?
A. 12 inches
B. 18 inches
C. 24 inches
D. 30 inches
Rationale: NEC 300.5 specifies that 120V branch circuits in residential
areas must be buried at a minimum of 24 inches to avoid accidental
contact.
6. What is the maximum allowable voltage drop recommended for
feeder and branch circuits in a dwelling?
A. 1%
B. 2%
C. 3%
D. 5%
Rationale: NEC Handbook recommends a 3% maximum voltage drop
for feeders and branch circuits to ensure efficient operation of
electrical equipment.
, 7. When installing a receptacle outdoors, which type of enclosure is
required?
A. NEMA 1
B. Weather-resistant
C. NEMA 4
D. NEMA 12
Rationale: NEC 406.9(B) requires outdoor receptacles to have
weather-resistant covers to prevent water intrusion.
8. What type of cable is typically used for interior residential wiring?
A. MC
B. SE
C. NM-B
D. UF
Rationale: NM-B (non-metallic sheathed cable) is commonly used for
interior residential wiring according to NEC 334.
9. How far must receptacles be spaced along a kitchen countertop?
A. Every 6 feet
B. Every 3 feet
C. Every 4 feet
D. Every 5 feet
Rationale: NEC 210.52(C)(1) requires countertop receptacles to be
installed so that no point along the countertop is more than 24
inches from a receptacle, effectively spacing them every 4 feet.
