ALABAMA ELECTRICAL CONTRACTOR EXAM |
COMPLETE EXAM WITH ACTUAL QUESTIONS WITH
CORRECT VERIFIED ANSWERS WITH RATIONALES
1. According to the NEC, the minimum working space in
front of an electrical panel rated 200A is:
A. 24 inches
B. 30 inches
C. 36 inches
D. 42 inches
Correct Answer: C
Rationale: NEC 110.26(A) requires a minimum of 36 inches
for safe working space in front of equipment ≥600V or rated
>200A.
2. A 3-phase, 480V feeder supplies 50A. What is the
minimum size copper conductor? (Use 75°C rating, THHN)
A. 6 AWG
B. 4 AWG
C. 2 AWG
D. 1 AWG
Correct Answer: B
,Rationale: Using NEC Table 310.16, 75°C copper 4 AWG
handles 85A, exceeding 50A load requirement.
3. A branch circuit supplying a 240V, 3,600W water heater
requires:
A. 15A breaker
B. 20A breaker
C. 25A breaker
D. 30A breaker
Correct Answer: B
Rationale: Current = 3,600 ÷ 240 = 15A. Apply 125% for
continuous load → 15 × 1.25 = 18.75A → next standard
breaker size = 20A.
4. A 120V lighting circuit with 10 fixtures, each 60W,
requires:
A. 5A breaker
B. 10A breaker
C. 15A breaker
D. 20A breaker
Correct Answer: A
Rationale: Total load = 10 × 60W = 600W; Current = 600 ÷
120 = 5A → 5A minimum protection.
,5. Grounding electrode conductor for a 200A service must
be:
A. 6 AWG copper
B. 4 AWG copper
C. 2 AWG copper
D. 1/0 AWG copper
Correct Answer: B
Rationale: NEC Table 250.66 specifies 4 AWG copper for
200A service grounding.
6. Maximum continuous load on a 20A, 120V circuit per NEC
is:
A. 12A
B. 16A
C. 20A
D. 24A
Correct Answer: B
Rationale: Continuous load ≤ 80% of rating → 20 × 0.8 = 16A.
7. Conduit fill for three 3/4-inch THHN conductors in 1-inch
EMT must not exceed:
, A. 20%
B. 40%
C. 53%
D. 60%
Correct Answer: B
Rationale: NEC Chapter 9 Table 1 allows up to 40% fill for 3
conductors in conduit.
8. A 120/240V, single-phase dwelling service for a 4,500
sq.ft house requires a minimum:
A. 100A
B. 150A
C. 200A
D. 250A
Correct Answer: B
Rationale: NEC Article 220 applies load calculations. Typical
modern home ≥150A service.
9. An outdoor service disconnect must be:
A. Rainproof
B. NEMA 1 enclosure
COMPLETE EXAM WITH ACTUAL QUESTIONS WITH
CORRECT VERIFIED ANSWERS WITH RATIONALES
1. According to the NEC, the minimum working space in
front of an electrical panel rated 200A is:
A. 24 inches
B. 30 inches
C. 36 inches
D. 42 inches
Correct Answer: C
Rationale: NEC 110.26(A) requires a minimum of 36 inches
for safe working space in front of equipment ≥600V or rated
>200A.
2. A 3-phase, 480V feeder supplies 50A. What is the
minimum size copper conductor? (Use 75°C rating, THHN)
A. 6 AWG
B. 4 AWG
C. 2 AWG
D. 1 AWG
Correct Answer: B
,Rationale: Using NEC Table 310.16, 75°C copper 4 AWG
handles 85A, exceeding 50A load requirement.
3. A branch circuit supplying a 240V, 3,600W water heater
requires:
A. 15A breaker
B. 20A breaker
C. 25A breaker
D. 30A breaker
Correct Answer: B
Rationale: Current = 3,600 ÷ 240 = 15A. Apply 125% for
continuous load → 15 × 1.25 = 18.75A → next standard
breaker size = 20A.
4. A 120V lighting circuit with 10 fixtures, each 60W,
requires:
A. 5A breaker
B. 10A breaker
C. 15A breaker
D. 20A breaker
Correct Answer: A
Rationale: Total load = 10 × 60W = 600W; Current = 600 ÷
120 = 5A → 5A minimum protection.
,5. Grounding electrode conductor for a 200A service must
be:
A. 6 AWG copper
B. 4 AWG copper
C. 2 AWG copper
D. 1/0 AWG copper
Correct Answer: B
Rationale: NEC Table 250.66 specifies 4 AWG copper for
200A service grounding.
6. Maximum continuous load on a 20A, 120V circuit per NEC
is:
A. 12A
B. 16A
C. 20A
D. 24A
Correct Answer: B
Rationale: Continuous load ≤ 80% of rating → 20 × 0.8 = 16A.
7. Conduit fill for three 3/4-inch THHN conductors in 1-inch
EMT must not exceed:
, A. 20%
B. 40%
C. 53%
D. 60%
Correct Answer: B
Rationale: NEC Chapter 9 Table 1 allows up to 40% fill for 3
conductors in conduit.
8. A 120/240V, single-phase dwelling service for a 4,500
sq.ft house requires a minimum:
A. 100A
B. 150A
C. 200A
D. 250A
Correct Answer: B
Rationale: NEC Article 220 applies load calculations. Typical
modern home ≥150A service.
9. An outdoor service disconnect must be:
A. Rainproof
B. NEMA 1 enclosure
