(2026 Update) Actual Practice Questions – Set 100
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1. What is the minimum cover depth for direct-buried residential branch
circuits rated 120 volts or less with GFCI protection?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
✔ Correct Answer: B. 12 inches
Explanation: NEC Table 300.5 permits reduced burial depth of 12 inches for
GFCI-protected residential branch circuits.
2. A conductor used to connect non–current-carrying metal parts of
equipment to the system grounded conductor is called:
A. Grounded conductor
B. Equipment grounding conductor
C. Bonding jumper
D. Grounding electrode conductor
✔ Correct Answer: B. Equipment grounding conductor
Explanation: The equipment grounding conductor provides a path for fault
current to facilitate overcurrent protection operation.
3. What is the allowable ampacity of a 12 AWG copper conductor with THHN
insulation at 75°C?
A. 15A
B. 20A
C. 25A
, D. 30A
✔ Correct Answer: B. 20A
Explanation: NEC Table 310.16 lists 12 AWG copper THHN at 20 amps
under the 75°C column.
4. Which NEC article covers grounding and bonding requirements?
A. Article 110
B. Article 210
C. Article 250
D. Article 300
✔ Correct Answer: C. Article 250
Explanation: Article 250 specifically addresses grounding and bonding
requirements.
5. What is the maximum number of 90-degree bends allowed in a conduit run
between pull points?
A. 2
B. 3
C. 4
D. 5
✔ Correct Answer: C. 4
Explanation: NEC limits total bends to 360 degrees (four 90° bends)
between pull points.
6. In a dwelling unit, what is the minimum number of required small-appliance
branch circuits?
A. 1
B. 2
C. 3
D. 4
✔ Correct Answer: B. 2
Explanation: NEC 210.11(C)(1) requires at least two small-appliance
branch circuits.
, 7. What device is required to protect personnel from electric shock in wet
locations?
A. AFCI
B. GFCI
C. Circuit breaker
D. Fuse
✔ Correct Answer: B. GFCI
Explanation: Ground-Fault Circuit Interrupters protect against electric
shock in wet areas.
8. What is the purpose of bonding?
A. Increase voltage
B. Provide insulation
C. Ensure electrical continuity
D. Reduce resistance
✔ Correct Answer: C. Ensure electrical continuity
Explanation: Bonding ensures conductive parts are electrically connected
for safety.
9. What is the standard voltage of a typical residential branch circuit?
A. 120V
B. 208V
C. 240V
D. 277V
✔ Correct Answer: A. 120V
Explanation: Most residential branch circuits operate at 120 volts.
10.What type of cable is commonly used for residential wiring?
A. MC
B. AC
C. NM
D. SE
✔ Correct Answer: C. NM