TEXAS ELECTRICAL CONTRACTOR LICENSE
1. What is the primary purpose of the National Electrical
Code (NEC)?
A. To set tax rates for electrical contractors
B. To provide minimum safety standards for electrical
installations
C. To regulate utility company pricing
D. To certify electrical inspectors
Answer: B
The NEC is a widely adopted set of minimum safety standards
designed to protect people and property from electrical
hazards. It does not set pricing, taxes, or certification rules but
instead focuses on safe installation practices for electrical
systems.
2. In Texas, which agency is primarily responsible for
licensing electrical contractors?
A. Texas Department of Transportation
B. Texas Workforce Commission
C. Texas Department of Licensing and Regulation (TDLR)
D. Public Utility Commission of Texas
Answer: C
The Texas Department of Licensing and Regulation (TDLR)
oversees licensing and enforcement for electrical contractors,
ensuring compliance with state laws and safety standards.
3. What is the minimum size grounding electrode conductor
typically required for a 200-amp service using copper?
A. 6 AWG
, B. 4 AWG
C. 2 AWG
D. 8 AWG
Answer: B
For a 200-amp service, NEC tables generally require a 4 AWG
copper grounding electrode conductor, depending on electrode
type. This ensures adequate fault current handling.
4. Which device is designed to protect against ground-fault
current leakage?
A. Circuit breaker
B. Fuse
C. GFCI
D. Transformer
Answer: C
A Ground Fault Circuit Interrupter (GFCI) detects small leakage
currents to ground and quickly shuts off power to prevent shock
hazards, especially in wet locations.
5. What is the main purpose of a conduit system?
A. Increase voltage capacity
B. Provide mechanical protection for conductors
C. Reduce electrical resistance
D. Generate electrical power
Answer: B
Conduit systems physically protect electrical wiring from
damage, moisture, and environmental hazards, improving
system durability and safety.
, 6. What does OSHA primarily regulate?
A. Electrical design standards
B. Workplace safety conditions
C. Electrical pricing structures
D. Utility distribution design
Answer: B
The Occupational Safety and Health Administration (OSHA)
focuses on ensuring safe working conditions for employees,
including electrical safety practices on job sites.
7. Which of the following is required before electrical work
can begin on most commercial projects?
A. Verbal approval from inspector
B. Electrical permit
C. Utility company agreement only
D. Completed wiring installation
Answer: B
An electrical permit is required to ensure the work is inspected
and complies with applicable codes and safety standards.
8. What is voltage drop primarily affected by?
A. Wire color
B. Wire length and current load
C. Breaker size only
D. Grounding type
Answer: B
Voltage drop increases with longer wire runs and higher current
loads. Proper conductor sizing helps minimize efficiency losses.
, 9. Which conductor is typically used for grounding in
residential systems?
A. Hot conductor
B. Neutral conductor only
C. Equipment grounding conductor
D. Ungrounded conductor
Answer: C
The equipment grounding conductor provides a safe path for
fault current, helping prevent electric shock hazards.
10. What is the standard frequency of residential
electrical power in the U.S.?
A. 50 Hz
B. 60 Hz
C. 100 Hz
D. 120 Hz
Answer: B
The United States uses 60 Hz alternating current for residential
and commercial power systems.
11. What is the purpose of a circuit breaker?
A. Increase voltage
B. Store electrical energy
C. Protect against overcurrent conditions
D. Reduce resistance
Answer: C
A circuit breaker automatically interrupts current flow when
overloads or short circuits occur, protecting wiring and
equipment.
1. What is the primary purpose of the National Electrical
Code (NEC)?
A. To set tax rates for electrical contractors
B. To provide minimum safety standards for electrical
installations
C. To regulate utility company pricing
D. To certify electrical inspectors
Answer: B
The NEC is a widely adopted set of minimum safety standards
designed to protect people and property from electrical
hazards. It does not set pricing, taxes, or certification rules but
instead focuses on safe installation practices for electrical
systems.
2. In Texas, which agency is primarily responsible for
licensing electrical contractors?
A. Texas Department of Transportation
B. Texas Workforce Commission
C. Texas Department of Licensing and Regulation (TDLR)
D. Public Utility Commission of Texas
Answer: C
The Texas Department of Licensing and Regulation (TDLR)
oversees licensing and enforcement for electrical contractors,
ensuring compliance with state laws and safety standards.
3. What is the minimum size grounding electrode conductor
typically required for a 200-amp service using copper?
A. 6 AWG
, B. 4 AWG
C. 2 AWG
D. 8 AWG
Answer: B
For a 200-amp service, NEC tables generally require a 4 AWG
copper grounding electrode conductor, depending on electrode
type. This ensures adequate fault current handling.
4. Which device is designed to protect against ground-fault
current leakage?
A. Circuit breaker
B. Fuse
C. GFCI
D. Transformer
Answer: C
A Ground Fault Circuit Interrupter (GFCI) detects small leakage
currents to ground and quickly shuts off power to prevent shock
hazards, especially in wet locations.
5. What is the main purpose of a conduit system?
A. Increase voltage capacity
B. Provide mechanical protection for conductors
C. Reduce electrical resistance
D. Generate electrical power
Answer: B
Conduit systems physically protect electrical wiring from
damage, moisture, and environmental hazards, improving
system durability and safety.
, 6. What does OSHA primarily regulate?
A. Electrical design standards
B. Workplace safety conditions
C. Electrical pricing structures
D. Utility distribution design
Answer: B
The Occupational Safety and Health Administration (OSHA)
focuses on ensuring safe working conditions for employees,
including electrical safety practices on job sites.
7. Which of the following is required before electrical work
can begin on most commercial projects?
A. Verbal approval from inspector
B. Electrical permit
C. Utility company agreement only
D. Completed wiring installation
Answer: B
An electrical permit is required to ensure the work is inspected
and complies with applicable codes and safety standards.
8. What is voltage drop primarily affected by?
A. Wire color
B. Wire length and current load
C. Breaker size only
D. Grounding type
Answer: B
Voltage drop increases with longer wire runs and higher current
loads. Proper conductor sizing helps minimize efficiency losses.
, 9. Which conductor is typically used for grounding in
residential systems?
A. Hot conductor
B. Neutral conductor only
C. Equipment grounding conductor
D. Ungrounded conductor
Answer: C
The equipment grounding conductor provides a safe path for
fault current, helping prevent electric shock hazards.
10. What is the standard frequency of residential
electrical power in the U.S.?
A. 50 Hz
B. 60 Hz
C. 100 Hz
D. 120 Hz
Answer: B
The United States uses 60 Hz alternating current for residential
and commercial power systems.
11. What is the purpose of a circuit breaker?
A. Increase voltage
B. Store electrical energy
C. Protect against overcurrent conditions
D. Reduce resistance
Answer: C
A circuit breaker automatically interrupts current flow when
overloads or short circuits occur, protecting wiring and
equipment.
