North Carolina Residential Single-Family Dwelling
Electrical Contractor Licensing Exam Preparation
Newest With Complete Questions And Correct
Detailed Answers| Brand New Version
1. What is the maximum number of receptacle outlets allowed on a
15-amp, 120-volt branch circuit for a dwelling living room according
to the NEC?
a) 6
b) 8
c) 10
d) 12
Answer: a) 6
Rationale: NEC Table 220.12 limits general-purpose 15-amp branch
circuits in dwelling units to 6 outlets to prevent overloads.
2. What type of wire is commonly used for residential branch
circuits in North Carolina?
a) Aluminum THHN
b) NM-B (Romex)
c) MC cable
d) BX cable
Answer: b) NM-B (Romex)
Rationale: NM-B cable, commonly called Romex, is widely used in
residential wiring for branch circuits.
3. A dwelling unit requires GFCI protection for which of the
following locations?
,a) Bedrooms
b) Garages
c) Living rooms
d) Dining rooms
Answer: b) Garages
Rationale: NEC 210.8(A) requires GFCI protection for receptacles in
garages, bathrooms, kitchens, and outdoors.
4. What is the minimum size copper grounding electrode conductor
for a 100-amp service?
a) 6 AWG
b) 8 AWG
c) 4 AWG
d) 2 AWG
Answer: a) 6 AWG
Rationale: NEC Table 250.66 specifies 6 AWG copper as the minimum
grounding electrode conductor for 100-amp services.
5. Which of the following is the correct color coding for a grounded
conductor in residential wiring?
a) Black
b) Red
c) White
d) Green
Answer: c) White
Rationale: NEC 200.6 identifies white or gray insulation for grounded
(neutral) conductors.
,6. A 240-volt, single-phase branch circuit requires which minimum
conductor size for 20 amps?
a) 14 AWG
b) 12 AWG
c) 10 AWG
d) 8 AWG
Answer: b) 12 AWG
Rationale: NEC Table 310.15(B)(16) states that 12 AWG copper
conductors are rated for 20 amps at 60°C.
7. Which device is required to protect a 15-amp branch circuit?
a) 15-amp fuse or breaker
b) 20-amp breaker only
c) 30-amp breaker only
d) 10-amp fuse
Answer: a) 15-amp fuse or breaker
Rationale: NEC 210.21(B)(1) requires that overcurrent protection
match the branch circuit rating.
8. The minimum height for wall-mounted receptacles in a kitchen
countertop area is:
a) 12 inches
b) 18 inches
c) 20 inches
d) 24 inches
Answer: b) 18 inches
Rationale: NEC 210.52(C)(5) requires countertop receptacles to be
mounted no more than 20 inches above the countertop, with 18
inches being standard.
, 9. What is the NEC-required spacing of receptacle outlets in a living
room?
a) Every 4 feet of wall space
b) Every 6 feet of wall space
c) Every 12 feet of wall space
d) Every 10 feet of wall space
Answer: b) Every 6 feet of wall space
Rationale: NEC 210.52(A) specifies that receptacle outlets must be
installed so that no point along the wall is more than 6 feet from an
outlet.
10. A residential service panel in a dwelling requires which type of
grounding?
a) Ground rod only
b) Water pipe and ground rod
c) Rebar in foundation only
d) Metal conduit only
Answer: b) Water pipe and ground rod
Rationale: NEC 250.52(A) requires grounding electrode systems,
typically including metal water piping and one or more ground rods.
11. Which conductor is used to connect a metal box to a ground in a
residential circuit?
a) Neutral conductor
b) Hot conductor
c) Equipment grounding conductor
d) Bonding jumper
Electrical Contractor Licensing Exam Preparation
Newest With Complete Questions And Correct
Detailed Answers| Brand New Version
1. What is the maximum number of receptacle outlets allowed on a
15-amp, 120-volt branch circuit for a dwelling living room according
to the NEC?
a) 6
b) 8
c) 10
d) 12
Answer: a) 6
Rationale: NEC Table 220.12 limits general-purpose 15-amp branch
circuits in dwelling units to 6 outlets to prevent overloads.
2. What type of wire is commonly used for residential branch
circuits in North Carolina?
a) Aluminum THHN
b) NM-B (Romex)
c) MC cable
d) BX cable
Answer: b) NM-B (Romex)
Rationale: NM-B cable, commonly called Romex, is widely used in
residential wiring for branch circuits.
3. A dwelling unit requires GFCI protection for which of the
following locations?
,a) Bedrooms
b) Garages
c) Living rooms
d) Dining rooms
Answer: b) Garages
Rationale: NEC 210.8(A) requires GFCI protection for receptacles in
garages, bathrooms, kitchens, and outdoors.
4. What is the minimum size copper grounding electrode conductor
for a 100-amp service?
a) 6 AWG
b) 8 AWG
c) 4 AWG
d) 2 AWG
Answer: a) 6 AWG
Rationale: NEC Table 250.66 specifies 6 AWG copper as the minimum
grounding electrode conductor for 100-amp services.
5. Which of the following is the correct color coding for a grounded
conductor in residential wiring?
a) Black
b) Red
c) White
d) Green
Answer: c) White
Rationale: NEC 200.6 identifies white or gray insulation for grounded
(neutral) conductors.
,6. A 240-volt, single-phase branch circuit requires which minimum
conductor size for 20 amps?
a) 14 AWG
b) 12 AWG
c) 10 AWG
d) 8 AWG
Answer: b) 12 AWG
Rationale: NEC Table 310.15(B)(16) states that 12 AWG copper
conductors are rated for 20 amps at 60°C.
7. Which device is required to protect a 15-amp branch circuit?
a) 15-amp fuse or breaker
b) 20-amp breaker only
c) 30-amp breaker only
d) 10-amp fuse
Answer: a) 15-amp fuse or breaker
Rationale: NEC 210.21(B)(1) requires that overcurrent protection
match the branch circuit rating.
8. The minimum height for wall-mounted receptacles in a kitchen
countertop area is:
a) 12 inches
b) 18 inches
c) 20 inches
d) 24 inches
Answer: b) 18 inches
Rationale: NEC 210.52(C)(5) requires countertop receptacles to be
mounted no more than 20 inches above the countertop, with 18
inches being standard.
, 9. What is the NEC-required spacing of receptacle outlets in a living
room?
a) Every 4 feet of wall space
b) Every 6 feet of wall space
c) Every 12 feet of wall space
d) Every 10 feet of wall space
Answer: b) Every 6 feet of wall space
Rationale: NEC 210.52(A) specifies that receptacle outlets must be
installed so that no point along the wall is more than 6 feet from an
outlet.
10. A residential service panel in a dwelling requires which type of
grounding?
a) Ground rod only
b) Water pipe and ground rod
c) Rebar in foundation only
d) Metal conduit only
Answer: b) Water pipe and ground rod
Rationale: NEC 250.52(A) requires grounding electrode systems,
typically including metal water piping and one or more ground rods.
11. Which conductor is used to connect a metal box to a ground in a
residential circuit?
a) Neutral conductor
b) Hot conductor
c) Equipment grounding conductor
d) Bonding jumper
