NEC Code Practice Exam Questions
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1. What is the minimum working space depth required in
front of electrical equipment rated 0–150 volts to
ground?
A. 24 inches
B. 36 inches
C. 30 inches
D. 42 inches
ANSWER: 36 inches is required by NEC 110.26(A)(1) to
provide safe access and working clearance.
2. What is the maximum number of current-carrying
conductors allowed in a ¾-inch EMT conduit?
A. 6
B. 8
C. 16
D. 22
ANSWER: 16 conductors are permitted per NEC Chapter 9,
Table 1 and Annex C.
, 3. Which color insulation is required for grounding
conductors?
A. White
B. Gray
C. Green
D. Red
ANSWER: Green or bare conductors are reserved for
equipment grounding per NEC 250.119.
4. What is the minimum cover required for a residential
branch circuit buried in PVC conduit?
A. 12 inches
B. 18 inches
C. 24 inches
D. 30 inches
ANSWER: 18 inches is required under NEC Table 300.5.
5. What NEC article covers grounding and bonding?
A. Article 210
B. Article 300
C. Article 250
D. Article 240
ANSWER: Article 250 addresses grounding and bonding
requirements.
, 6. What is the maximum rating of a GFCI receptacle used
on a 120-volt circuit?
A. 15 amps
B. 20 amps
C. 30 amps
D. 40 amps
ANSWER: 20 amps is the maximum allowed for standard GFCI
receptacles per NEC 210.8.
7. What type of receptacle is required in bathrooms?
A. Standard duplex
B. AFCI
C. GFCI
D. Isolated ground
ANSWER: GFCI protection is required by NEC 210.8(A).
8. What is the minimum size copper equipment grounding
conductor for a 60-amp circuit?
A. 10 AWG
B. 8 AWG
C. 6 AWG
D. 12 AWG
ANSWER: 8 AWG copper is required per NEC Table 250.122.
, 9. Which conductor is grounded in a typical single-phase
system?
A. Hot
B. Neutral
C. Equipment ground
D. Bonding jumper
ANSWER: Neutral is the grounded conductor per NEC
definitions.
10. How many receptacles are required for a kitchen
countertop 12 feet long?
A. 3
B. 4
C. 5
D. 6
ANSWER: 4 receptacles are required per NEC 210.52(C).
11. What NEC article covers overcurrent protection?
A. 210
B. 240
C. 250
D. 300
ANSWER: Article 240 governs overcurrent protection devices.
Correct Answers, and Detailed
Explanations for Computer Science
Students||Already Graded A+
1. What is the minimum working space depth required in
front of electrical equipment rated 0–150 volts to
ground?
A. 24 inches
B. 36 inches
C. 30 inches
D. 42 inches
ANSWER: 36 inches is required by NEC 110.26(A)(1) to
provide safe access and working clearance.
2. What is the maximum number of current-carrying
conductors allowed in a ¾-inch EMT conduit?
A. 6
B. 8
C. 16
D. 22
ANSWER: 16 conductors are permitted per NEC Chapter 9,
Table 1 and Annex C.
, 3. Which color insulation is required for grounding
conductors?
A. White
B. Gray
C. Green
D. Red
ANSWER: Green or bare conductors are reserved for
equipment grounding per NEC 250.119.
4. What is the minimum cover required for a residential
branch circuit buried in PVC conduit?
A. 12 inches
B. 18 inches
C. 24 inches
D. 30 inches
ANSWER: 18 inches is required under NEC Table 300.5.
5. What NEC article covers grounding and bonding?
A. Article 210
B. Article 300
C. Article 250
D. Article 240
ANSWER: Article 250 addresses grounding and bonding
requirements.
, 6. What is the maximum rating of a GFCI receptacle used
on a 120-volt circuit?
A. 15 amps
B. 20 amps
C. 30 amps
D. 40 amps
ANSWER: 20 amps is the maximum allowed for standard GFCI
receptacles per NEC 210.8.
7. What type of receptacle is required in bathrooms?
A. Standard duplex
B. AFCI
C. GFCI
D. Isolated ground
ANSWER: GFCI protection is required by NEC 210.8(A).
8. What is the minimum size copper equipment grounding
conductor for a 60-amp circuit?
A. 10 AWG
B. 8 AWG
C. 6 AWG
D. 12 AWG
ANSWER: 8 AWG copper is required per NEC Table 250.122.
, 9. Which conductor is grounded in a typical single-phase
system?
A. Hot
B. Neutral
C. Equipment ground
D. Bonding jumper
ANSWER: Neutral is the grounded conductor per NEC
definitions.
10. How many receptacles are required for a kitchen
countertop 12 feet long?
A. 3
B. 4
C. 5
D. 6
ANSWER: 4 receptacles are required per NEC 210.52(C).
11. What NEC article covers overcurrent protection?
A. 210
B. 240
C. 250
D. 300
ANSWER: Article 240 governs overcurrent protection devices.
