Texas Electrical Contractor Licensing Exam
Questions With Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
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1. What is the primary purpose of the National Electrical Code
(NEC)?
A. To provide utility billing standards
B. To establish minimum safety requirements for electrical
installations
C. To design electrical utility pricing models
D. To regulate electrical appliance manufacturing
Answer: B
The NEC is primarily used as a safety standard to ensure electrical
installations protect people and property from electrical hazards. It is
not a design manual or pricing guide.
2. Which organization publishes the NEC?
A. OSHA
, B. IEEE
C. NFPA
D. NEC Board
Answer: C
The National Fire Protection Association (NFPA) is responsible for
publishing the NEC (NFPA 70).
3. In general, which voltage is considered low voltage under most
electrical codes?
A. 1,000V and above
B. Below 50V
C. Below 600V
D. Below 1,000V
Answer: C
Most electrical codes classify systems under 600 volts as low voltage
distribution systems in residential and commercial contexts.
4. What is the function of a circuit breaker?
A. Store electrical energy
B. Increase voltage
, C. Protect circuits from overcurrent
D. Convert AC to DC
Answer: C
Circuit breakers automatically interrupt current flow when an
overload or short circuit occurs.
5. Which device provides protection against ground-fault currents?
A. Transformer
B. GFCI
C. Disconnect switch
D. Capacitor
Answer: B
Ground-Fault Circuit Interrupters (GFCIs) detect leakage current and
quickly shut off power to prevent shock hazards.
6. What is the standard color of the equipment grounding conductor
in the NEC?
A. White or gray
B. Green or bare copper
, C. Black
D. Red
Answer: B
Equipment grounding conductors are identified by green insulation or
are bare copper.
7. What does NEC Article 250 cover?
A. Lighting systems
B. Grounding and bonding
C. Motor controls
D. Fire alarms
Answer: B
Article 250 specifically addresses grounding and bonding
requirements.
8. What is the purpose of bonding in an electrical system?
A. Increase circuit resistance
B. Ensure electrical continuity and reduce voltage differences
C. Reduce voltage drop
D. Store energy in conductors
Questions With Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of the National Electrical Code
(NEC)?
A. To provide utility billing standards
B. To establish minimum safety requirements for electrical
installations
C. To design electrical utility pricing models
D. To regulate electrical appliance manufacturing
Answer: B
The NEC is primarily used as a safety standard to ensure electrical
installations protect people and property from electrical hazards. It is
not a design manual or pricing guide.
2. Which organization publishes the NEC?
A. OSHA
, B. IEEE
C. NFPA
D. NEC Board
Answer: C
The National Fire Protection Association (NFPA) is responsible for
publishing the NEC (NFPA 70).
3. In general, which voltage is considered low voltage under most
electrical codes?
A. 1,000V and above
B. Below 50V
C. Below 600V
D. Below 1,000V
Answer: C
Most electrical codes classify systems under 600 volts as low voltage
distribution systems in residential and commercial contexts.
4. What is the function of a circuit breaker?
A. Store electrical energy
B. Increase voltage
, C. Protect circuits from overcurrent
D. Convert AC to DC
Answer: C
Circuit breakers automatically interrupt current flow when an
overload or short circuit occurs.
5. Which device provides protection against ground-fault currents?
A. Transformer
B. GFCI
C. Disconnect switch
D. Capacitor
Answer: B
Ground-Fault Circuit Interrupters (GFCIs) detect leakage current and
quickly shut off power to prevent shock hazards.
6. What is the standard color of the equipment grounding conductor
in the NEC?
A. White or gray
B. Green or bare copper
, C. Black
D. Red
Answer: B
Equipment grounding conductors are identified by green insulation or
are bare copper.
7. What does NEC Article 250 cover?
A. Lighting systems
B. Grounding and bonding
C. Motor controls
D. Fire alarms
Answer: B
Article 250 specifically addresses grounding and bonding
requirements.
8. What is the purpose of bonding in an electrical system?
A. Increase circuit resistance
B. Ensure electrical continuity and reduce voltage differences
C. Reduce voltage drop
D. Store energy in conductors
