Electrical Contractor Licensing Exam – Practice Questions Verified Questions, Correct Answers, and Detailed Explanations for Computer Science Students||Already Graded A+

Electrical Contractor Licensing Exam – Practice
Questions Verified Questions, Correct Answers, and
Detailed Explanations for Computer Science
Students||Already Graded A+
1. What is the primary purpose of the National Electrical Code (NEC)?
A. To design electrical equipment
B. To ensure safety in electrical installations
C. To establish electrical utility rates
D. To regulate electrical labor wages
Answer: B
Rationale: The NEC provides minimum standards for safe electrical installations
to protect people and property from electrical hazards.
2. Which of the following is considered a Class A fire in terms of electrical
hazards?
A. Electrical panels
B. Wood, paper, and cloth
C. Flammable liquids
D. Electrical circuits
Answer: B
Rationale: Class A fires involve ordinary combustibles like wood, paper, and
cloth, whereas electrical fires are Class C.
3. What is the maximum overcurrent protection allowed for a 14 AWG
copper conductor in a branch circuit?
A. 10 A
B. 15 A
C. 20 A
D. 25 A
Answer: B
Rationale: According to NEC Table 310.15(B)(16), 14 AWG copper is rated for
15 A in standard branch circuits.
4. When must a ground-fault circuit interrupter (GFCI) be installed?
A. In all bedrooms
B. In kitchens, bathrooms, and outdoor outlets

,C. Only in commercial buildings
D. Only in industrial settings
Answer: B
Rationale: GFCIs protect against electrical shock in wet or damp areas as
required by the NEC.
5. Which type of conduit is suitable for outdoor underground installations?
A. EMT
B. PVC
C. FMC
D. ENT
Answer: B
Rationale: PVC is non-metallic, corrosion-resistant, and suitable for
underground use.
6. What color is typically used for a grounding conductor?
A. Black
B. White
C. Green or bare copper
D. Red
Answer: C
Rationale: NEC requires grounding conductors to be green or bare copper to
distinguish them from other conductors.
7. What is the minimum height for a ceiling-mounted lighting fixture in a
residential kitchen above a countertop?
A. 12 inches
B. 18 inches
C. 30 inches
D. 36 inches
Answer: D
Rationale: NEC requires at least 36 inches clearance to prevent hazards and
allow for safe usage.
8. Which device is used to prevent overcurrent in a circuit?
A. Transformer
B. Circuit breaker
C. Contactor
D. Receptacle
Answer: B

, Rationale: Circuit breakers protect circuits by automatically interrupting excess
current.
9. What is the primary function of a service disconnect?
A. Convert AC to DC
B. Allow emergency power shutoff
C. Increase voltage
D. Distribute neutral current
Answer: B
Rationale: Service disconnects allow for the safe shutdown of electrical service
during emergencies or maintenance.
10. How often should electrical panels be inspected in commercial buildings?
A. Every year
B. Every 3 years
C. Every 5 years
D. Only when problems occur
Answer: A
Rationale: Annual inspections ensure panels remain safe and code-compliant.
11. Which type of wire insulation is rated for wet locations?
A. THHN
B. THWN
C. NM-B
D. UF-B
Answer: B
Rationale: THWN insulation is rated for wet environments, unlike standard
THHN.
12. What is the maximum number of 12 AWG conductors allowed in a 3/4-
inch EMT conduit?
A. 9
B. 10
C. 11
D. 12
Answer: A
Rationale: NEC conduit fill tables specify a maximum of 9 12 AWG conductors in
a 3/4-inch EMT.