OKLAHOMA ELECTRICAL CONTRACTOR
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 dwelling unit branch circuit supplies general lighting and receptacles.
According to NEC practice, what is the minimum number of 20A small-
appliance branch circuits required in a kitchen?
A. 1
B. 2
C. 3
D. 4
Correct Answer: B ✓
Rationale: A minimum of two 20A small-appliance branch circuits is required to
serve kitchen receptacles in dwelling units for load distribution and safety.
2. What is the maximum number of 14 AWG copper conductors permitted in a
½-inch EMT conduit without derating considerations?
A. 6
B. 7
C. 9
D. 12
Correct Answer: B ✓
Rationale: Conduit fill tables allow up to seven 14 AWG conductors in ½-inch
EMT under standard fill limits.
, 3. A 240V single-phase load draws 24A. What is the minimum circuit breaker
rating?
A. 25A
B. 30A
C. 35A
D. 40A
Correct Answer: B ✓
Rationale: Standard breaker sizing requires selecting the next standard size
above load; 24A requires a 30A breaker.
4. In a residential grounding system, the grounding electrode conductor
connects to:
A. Neutral bus only
B. Equipment grounding conductor
C. Grounding electrode system
D. Transformer secondary only
Correct Answer: C ✓
Rationale: The grounding electrode conductor bonds the system to the
grounding electrode system such as rods or water pipe.
5. What is the maximum voltage drop recommended for branch circuits for
efficient operation?
A. 1%
B. 3%
C. 5%
D. 10%
Correct Answer: C ✓
Rationale: NEC recommended practice is 3% for branch circuits and 5% total
feeder + branch, but 5% is commonly referenced for branch circuit design
allowance.
6. A motor rated 10 HP, 230V, three-phase requires what minimum conductor
sizing practice?
, A. Based on full load current × 100%
B. Based on nameplate only
C. Based on 125% of motor full-load current
D. Based on breaker size only
Correct Answer: C ✓
Rationale: Motor conductors are typically sized at 125% of full-load current for
continuous operation safety.
7. Which device protects against ground-fault leakage current?
A. AFCI
B. GFCI
C. Circuit breaker
D. Fuse
Correct Answer: B ✓
Rationale: GFCI devices protect personnel from ground-fault leakage by
disconnecting power quickly.
8. The minimum burial depth for PVC conduit under a residential driveway is
typically:
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Correct Answer: C ✓
Rationale: Residential driveway installations generally require 18 inches
minimum cover for PVC conduit.
9. What is the primary purpose of a panelboard neutral bus?
A. Carry fault current
B. Provide grounding path
C. Distribute neutral return current
D. Increase voltage stability
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 dwelling unit branch circuit supplies general lighting and receptacles.
According to NEC practice, what is the minimum number of 20A small-
appliance branch circuits required in a kitchen?
A. 1
B. 2
C. 3
D. 4
Correct Answer: B ✓
Rationale: A minimum of two 20A small-appliance branch circuits is required to
serve kitchen receptacles in dwelling units for load distribution and safety.
2. What is the maximum number of 14 AWG copper conductors permitted in a
½-inch EMT conduit without derating considerations?
A. 6
B. 7
C. 9
D. 12
Correct Answer: B ✓
Rationale: Conduit fill tables allow up to seven 14 AWG conductors in ½-inch
EMT under standard fill limits.
, 3. A 240V single-phase load draws 24A. What is the minimum circuit breaker
rating?
A. 25A
B. 30A
C. 35A
D. 40A
Correct Answer: B ✓
Rationale: Standard breaker sizing requires selecting the next standard size
above load; 24A requires a 30A breaker.
4. In a residential grounding system, the grounding electrode conductor
connects to:
A. Neutral bus only
B. Equipment grounding conductor
C. Grounding electrode system
D. Transformer secondary only
Correct Answer: C ✓
Rationale: The grounding electrode conductor bonds the system to the
grounding electrode system such as rods or water pipe.
5. What is the maximum voltage drop recommended for branch circuits for
efficient operation?
A. 1%
B. 3%
C. 5%
D. 10%
Correct Answer: C ✓
Rationale: NEC recommended practice is 3% for branch circuits and 5% total
feeder + branch, but 5% is commonly referenced for branch circuit design
allowance.
6. A motor rated 10 HP, 230V, three-phase requires what minimum conductor
sizing practice?
, A. Based on full load current × 100%
B. Based on nameplate only
C. Based on 125% of motor full-load current
D. Based on breaker size only
Correct Answer: C ✓
Rationale: Motor conductors are typically sized at 125% of full-load current for
continuous operation safety.
7. Which device protects against ground-fault leakage current?
A. AFCI
B. GFCI
C. Circuit breaker
D. Fuse
Correct Answer: B ✓
Rationale: GFCI devices protect personnel from ground-fault leakage by
disconnecting power quickly.
8. The minimum burial depth for PVC conduit under a residential driveway is
typically:
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Correct Answer: C ✓
Rationale: Residential driveway installations generally require 18 inches
minimum cover for PVC conduit.
9. What is the primary purpose of a panelboard neutral bus?
A. Carry fault current
B. Provide grounding path
C. Distribute neutral return current
D. Increase voltage stability
