NORTH CAROLINA RESIDENTIAL
SINGLE-FAMILY DWELLING
ELECTRICAL CONTRACTOR
LICENSING EXAM 2027 QUESTIONS
AND CORRECT ANSWERS WITH
EXPLANATIONS
1. According to NEC 210.8(A), which of the following locations in a residential dwelling does
NOT require GFCI protection for 125-volt, single-phase, 15- and 20-ampere receptacles?
A. Finished attic spaces used for storage
B. Garages and service bays
C. Crawl spaces at or below grade level
D. Unfinished portions of basements
Answer: A
Conceptual Explanation: NEC 210.8(A) requires GFCI protection for receptacles in
garages, crawl spaces, and unfinished basements. Finished attics not used as habitable
rooms are not specifically listed under the mandatory GFCI requirements for dwellings
unless they meet other criteria like proximity to sinks.
,2. What is the maximum number of #12 AWG THHN conductors permitted in a 4-inch x 1 1/2-
inch square box that already contains two internal cable clamps and one equipment
grounding conductor?
A. 6
B. 9
C. 7
D. 8
Answer: D
Conceptual Explanation: A 4 x 1.5 square box has a volume of 21.0 cu in. #12 AWG
requires 2.25 cu in. Internal clamps count as one #12 (2.25). The ground counts as one #12
(2.25). 21.0 - 2.25 (clamps) - 2.25 (ground) = 16.5 cu in. 16..25 = 7.33. Therefore, 7
additional circuit conductors are allowed, but the question asks for the total conductors
including the ground and device allowance if applicable. Calculation: 21..25 = 9.33
total units. Minus 1 for clamps, minus 1 for ground = 7.33. Max is 7 circuit conductors plus
1 ground.
3. For a one-family dwelling, the service disconnecting means must have a rating of not less
than how many amperes?
A. 100 Amperes
B. 60 Amperes
C. 125 Amperes
, D. 200 Amperes
Answer: A
Conceptual Explanation: NEC 230.79(C) requires that for a one-family dwelling, the
service disconnecting means shall have a rating of not less than 100 amperes, 3-wire.
4. In a residential kitchen, what is the maximum horizontal distance allowed between any
point along the floor line and a receptacle outlet in a wall space?
A. 6 feet
B. 4 feet
C. 2 feet
D. 12 feet
Answer: A
Conceptual Explanation: NEC 210.52(A)(1) states that receptacles shall be installed so
that no point measured horizontally along the floor line in any wall space is more than 6
feet from an outlet.
5. Which of the following is the minimum size Copper-Clad Aluminum grounding electrode
conductor for a service with 2/0 AWG Copper service-entrance conductors?
A. #4 AWG
B. #2 AWG
C. 1/0 AWG
SINGLE-FAMILY DWELLING
ELECTRICAL CONTRACTOR
LICENSING EXAM 2027 QUESTIONS
AND CORRECT ANSWERS WITH
EXPLANATIONS
1. According to NEC 210.8(A), which of the following locations in a residential dwelling does
NOT require GFCI protection for 125-volt, single-phase, 15- and 20-ampere receptacles?
A. Finished attic spaces used for storage
B. Garages and service bays
C. Crawl spaces at or below grade level
D. Unfinished portions of basements
Answer: A
Conceptual Explanation: NEC 210.8(A) requires GFCI protection for receptacles in
garages, crawl spaces, and unfinished basements. Finished attics not used as habitable
rooms are not specifically listed under the mandatory GFCI requirements for dwellings
unless they meet other criteria like proximity to sinks.
,2. What is the maximum number of #12 AWG THHN conductors permitted in a 4-inch x 1 1/2-
inch square box that already contains two internal cable clamps and one equipment
grounding conductor?
A. 6
B. 9
C. 7
D. 8
Answer: D
Conceptual Explanation: A 4 x 1.5 square box has a volume of 21.0 cu in. #12 AWG
requires 2.25 cu in. Internal clamps count as one #12 (2.25). The ground counts as one #12
(2.25). 21.0 - 2.25 (clamps) - 2.25 (ground) = 16.5 cu in. 16..25 = 7.33. Therefore, 7
additional circuit conductors are allowed, but the question asks for the total conductors
including the ground and device allowance if applicable. Calculation: 21..25 = 9.33
total units. Minus 1 for clamps, minus 1 for ground = 7.33. Max is 7 circuit conductors plus
1 ground.
3. For a one-family dwelling, the service disconnecting means must have a rating of not less
than how many amperes?
A. 100 Amperes
B. 60 Amperes
C. 125 Amperes
, D. 200 Amperes
Answer: A
Conceptual Explanation: NEC 230.79(C) requires that for a one-family dwelling, the
service disconnecting means shall have a rating of not less than 100 amperes, 3-wire.
4. In a residential kitchen, what is the maximum horizontal distance allowed between any
point along the floor line and a receptacle outlet in a wall space?
A. 6 feet
B. 4 feet
C. 2 feet
D. 12 feet
Answer: A
Conceptual Explanation: NEC 210.52(A)(1) states that receptacles shall be installed so
that no point measured horizontally along the floor line in any wall space is more than 6
feet from an outlet.
5. Which of the following is the minimum size Copper-Clad Aluminum grounding electrode
conductor for a service with 2/0 AWG Copper service-entrance conductors?
A. #4 AWG
B. #2 AWG
C. 1/0 AWG
