DISTRICT OF COLUMBIA JOURNEYMAN
ELECTRICIAN EXAM Newest (2026
Update) Actual Practice Questions – Set
100 Most Common Exam Questions And
Answers In Details 100% Verified Exam
Highly Recommendable For Grade A+
1. A conductor is carrying 28 amperes continuously. According to NEC
requirements, the minimum ampacity of the conductor must be:
A. 28A
B. 30A
C. 35A
D. 40A
Answer: D ✓ (D: 40A)
Rationale: Continuous loads require conductors sized at 125% of load; 28A × 1.25
= 35A minimum, so next standard size is 40A.
2. What is the maximum number of 12 AWG conductors allowed in a ½-inch EMT
conduit (no fittings, THHN insulation)?
A. 6
B. 7
,C. 9
D. 10
Answer: B ✓ (B: 7)
Rationale: NEC conduit fill tables limit 12 AWG THHN conductors in ½-inch EMT
to 7 conductors at 40% fill.
3. A 240V single-phase load draws 20A. What is the power in watts?
A. 2400W
B. 3600W
C. 4800W
D. 6000W
Answer: C ✓ (C: 4800W)
Rationale: P = V × I = 240 × 20 = 4800 watts.
4. Which device protects against ground-fault current leakage?
A. AFCI
B. GFCI
C. Circuit breaker
D. Fuse
Answer: B ✓ (B: GFCI)
Rationale: GFCI devices protect personnel from ground-fault current by detecting
imbalance between hot and neutral.
5. Minimum burial depth for rigid metal conduit under a residential driveway is
typically:
A. 6 inches
B. 12 inches
, C. 18 inches
D. 24 inches
Answer: D ✓ (D: 24 inches)
Rationale: NEC Table 300.5 requires 24 inches cover for RMC under residential
driveways.
6. The purpose of a neutral conductor is to:
A. Carry fault current only
B. Provide equipment grounding
C. Carry unbalanced return current
D. Increase voltage
Answer: C ✓ (C: Carry unbalanced return current)
Rationale: Neutral carries return current from unbalanced loads in a system.
7. A 15A circuit breaker is typically required to protect which wire size?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Answer: A ✓ (A: 14 AWG)
Rationale: NEC requires 14 AWG copper conductors for 15A circuits.
8. What is the main purpose of bonding?
A. Increase voltage stability
B. Provide low-resistance fault path
C. Reduce conductor size
D. Improve insulation resistance
ELECTRICIAN EXAM Newest (2026
Update) Actual Practice Questions – Set
100 Most Common Exam Questions And
Answers In Details 100% Verified Exam
Highly Recommendable For Grade A+
1. A conductor is carrying 28 amperes continuously. According to NEC
requirements, the minimum ampacity of the conductor must be:
A. 28A
B. 30A
C. 35A
D. 40A
Answer: D ✓ (D: 40A)
Rationale: Continuous loads require conductors sized at 125% of load; 28A × 1.25
= 35A minimum, so next standard size is 40A.
2. What is the maximum number of 12 AWG conductors allowed in a ½-inch EMT
conduit (no fittings, THHN insulation)?
A. 6
B. 7
,C. 9
D. 10
Answer: B ✓ (B: 7)
Rationale: NEC conduit fill tables limit 12 AWG THHN conductors in ½-inch EMT
to 7 conductors at 40% fill.
3. A 240V single-phase load draws 20A. What is the power in watts?
A. 2400W
B. 3600W
C. 4800W
D. 6000W
Answer: C ✓ (C: 4800W)
Rationale: P = V × I = 240 × 20 = 4800 watts.
4. Which device protects against ground-fault current leakage?
A. AFCI
B. GFCI
C. Circuit breaker
D. Fuse
Answer: B ✓ (B: GFCI)
Rationale: GFCI devices protect personnel from ground-fault current by detecting
imbalance between hot and neutral.
5. Minimum burial depth for rigid metal conduit under a residential driveway is
typically:
A. 6 inches
B. 12 inches
, C. 18 inches
D. 24 inches
Answer: D ✓ (D: 24 inches)
Rationale: NEC Table 300.5 requires 24 inches cover for RMC under residential
driveways.
6. The purpose of a neutral conductor is to:
A. Carry fault current only
B. Provide equipment grounding
C. Carry unbalanced return current
D. Increase voltage
Answer: C ✓ (C: Carry unbalanced return current)
Rationale: Neutral carries return current from unbalanced loads in a system.
7. A 15A circuit breaker is typically required to protect which wire size?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Answer: A ✓ (A: 14 AWG)
Rationale: NEC requires 14 AWG copper conductors for 15A circuits.
8. What is the main purpose of bonding?
A. Increase voltage stability
B. Provide low-resistance fault path
C. Reduce conductor size
D. Improve insulation resistance
