Texas Electrical Contractor Examination
Practice Exam 2026 | 100 Questions &
Answers with Detailed Rationales |
Complete Exam Prep & Study Guide
1. What is the primary purpose of the National Electrical Code (NEC)?
A. To establish labor rates
B. The practical safeguarding of persons and property from electrical hazards
C. To regulate utility companies
D. To establish building permit fees
Answer: The practical safeguarding of persons and property from electrical
hazards
Rationale: NEC 90.1(A) states that the purpose of the Code is the practical
safeguarding of people and property from hazards arising from the use of
electricity.
2. Which organization publishes the National Electrical Code?
A. IEEE
,B. OSHA
C. National Fire Protection Association (NFPA)
D. ANSI
Answer: National Fire Protection Association (NFPA)
Rationale: The NFPA develops and publishes the NEC on a three-year revision
cycle.
3. In Texas, electrical contractors must generally be licensed through:
A. Texas Department of Transportation
B. Texas Secretary of State
C. Texas Department of Licensing and Regulation (TDLR)
D. Texas Workforce Commission
Answer: Texas Department of Licensing and Regulation (TDLR)
Rationale: TDLR regulates electrical licensing and contractor registration in
Texas.
4. Which conductor is normally connected to earth at the service equipment?
A. Equipment grounding conductor
B. Grounding electrode conductor
C. Grounded (neutral) conductor
D. Bonding jumper
Answer: Grounded (neutral) conductor
,Rationale: The grounded conductor is bonded to the grounding electrode system
at the service disconnecting means.
5. Copper conductors generally have what advantage over aluminum
conductors?
A. Lower conductivity
B. Lower strength
C. Higher conductivity and better durability
D. Higher resistance
Answer: Higher conductivity and better durability
Rationale: Copper offers better conductivity, mechanical strength, and corrosion
resistance than aluminum.
6. Which NEC chapter primarily covers wiring methods?
A. Chapter 1
B. Chapter 2
C. Chapter 3
D. Chapter 8
Answer: Chapter 3
Rationale: Chapter 3 contains wiring methods and materials requirements.
7. Which device protects against overloads and short circuits?
A. Relay
, B. Contactor
C. Circuit breaker
D. Transformer
Answer: Circuit breaker
Rationale: Circuit breakers automatically interrupt excessive current conditions.
8. Conductors installed underground must generally be protected by:
A. PVC paint
B. Approved raceways or direct-burial methods permitted by the NEC
C. Electrical tape
D. Plastic wrap
Answer: Approved raceways or direct-burial methods permitted by the NEC
Rationale: Underground wiring must comply with NEC-approved installation
methods.
9. Which voltage is commonly used for residential branch circuits?
A. 24V
B. 48V
C. 120V
D. 600V
Answer: 120V
Practice Exam 2026 | 100 Questions &
Answers with Detailed Rationales |
Complete Exam Prep & Study Guide
1. What is the primary purpose of the National Electrical Code (NEC)?
A. To establish labor rates
B. The practical safeguarding of persons and property from electrical hazards
C. To regulate utility companies
D. To establish building permit fees
Answer: The practical safeguarding of persons and property from electrical
hazards
Rationale: NEC 90.1(A) states that the purpose of the Code is the practical
safeguarding of people and property from hazards arising from the use of
electricity.
2. Which organization publishes the National Electrical Code?
A. IEEE
,B. OSHA
C. National Fire Protection Association (NFPA)
D. ANSI
Answer: National Fire Protection Association (NFPA)
Rationale: The NFPA develops and publishes the NEC on a three-year revision
cycle.
3. In Texas, electrical contractors must generally be licensed through:
A. Texas Department of Transportation
B. Texas Secretary of State
C. Texas Department of Licensing and Regulation (TDLR)
D. Texas Workforce Commission
Answer: Texas Department of Licensing and Regulation (TDLR)
Rationale: TDLR regulates electrical licensing and contractor registration in
Texas.
4. Which conductor is normally connected to earth at the service equipment?
A. Equipment grounding conductor
B. Grounding electrode conductor
C. Grounded (neutral) conductor
D. Bonding jumper
Answer: Grounded (neutral) conductor
,Rationale: The grounded conductor is bonded to the grounding electrode system
at the service disconnecting means.
5. Copper conductors generally have what advantage over aluminum
conductors?
A. Lower conductivity
B. Lower strength
C. Higher conductivity and better durability
D. Higher resistance
Answer: Higher conductivity and better durability
Rationale: Copper offers better conductivity, mechanical strength, and corrosion
resistance than aluminum.
6. Which NEC chapter primarily covers wiring methods?
A. Chapter 1
B. Chapter 2
C. Chapter 3
D. Chapter 8
Answer: Chapter 3
Rationale: Chapter 3 contains wiring methods and materials requirements.
7. Which device protects against overloads and short circuits?
A. Relay
, B. Contactor
C. Circuit breaker
D. Transformer
Answer: Circuit breaker
Rationale: Circuit breakers automatically interrupt excessive current conditions.
8. Conductors installed underground must generally be protected by:
A. PVC paint
B. Approved raceways or direct-burial methods permitted by the NEC
C. Electrical tape
D. Plastic wrap
Answer: Approved raceways or direct-burial methods permitted by the NEC
Rationale: Underground wiring must comply with NEC-approved installation
methods.
9. Which voltage is commonly used for residential branch circuits?
A. 24V
B. 48V
C. 120V
D. 600V
Answer: 120V
