Texas Electrical Contractor License Exam 2026 – 190 Practice
Questions with Correct Answers & Detailed Rationales, NEC 2023,
Electrical Wiring and Circuits, Grounding and Bonding, TDLR
Statutes and Rules, Electrical Calculations, Code Compliance &
Safety Standards
Section 1: National Electrical Code — General Requirements and Definitions (Questions
1–15)
Question 1
Which of the following best describes the purpose of the National Electrical Code as stated
in Article 90?
A. To provide design specifications for electrical engineers
B. To establish minimum requirements for safe electrical installations
C. To mandate the use of specific manufacturer products
D. To ensure electrical systems operate at maximum efficiency
Correct Answer: B
Explanation: The NEC is a minimum safety standard, not a design manual or efficiency guide.
It establishes requirements that protect people and property from electrical hazards.
Question 2
A licensed electrical contractor is planning a commercial installation. According to NEC
Article 100, what is the definition of a "feeder"?
,A. All circuit conductors between the service equipment and the final branch-circuit
overcurrent device
B. The conductors between the utility transformer and the service point
C. The circuit conductors between the branch-circuit overcurrent device and the outlet
D. The conductors that connect the grounding electrode to the earth
Correct Answer: A
Explanation: A feeder supplies power from the service equipment (or separately derived
system) to branch-circuit overcurrent devices. It does not include branch-circuit conductors
or service conductors.
Question 3
A contractor is evaluating an existing installation where the electrical equipment has been
listed by a recognized testing laboratory. What does the term "listed" indicate per NEC
Article 100?
A. The equipment is guaranteed to last for ten years
B. The equipment complies with local building codes
C. The equipment has been tested and found suitable for a specific purpose by an approved
agency
D. The equipment was manufactured in the United States
Correct Answer: C
Explanation: "Listed" means equipment has been evaluated by a nationally recognized
testing laboratory and found suitable for its intended use under specified conditions.
,Question 4
In a commercial building, a junction box is installed in a location that is "accessible" per NEC
definitions. Which statement best describes an accessible wiring method?
A. The wiring can be accessed without damaging the building structure or finish
B. The wiring is located outdoors only
C. The wiring is installed above a suspended ceiling
D. The wiring can only be accessed by licensed electricians
Correct Answer: A
Explanation: Accessibility refers to the ability to reach equipment for inspection,
maintenance, or repair without demolishing structural elements. Above suspended ceilings
may be accessible or not depending on conditions.
Question 5
An electrical contractor is reviewing specifications for a new installation. The term
"approved" as used in the NEC means:
A. Acceptable to the authority having jurisdiction
B. Meets the minimum requirements of the NEC only
C. Approved by the electrical contractor
D. Listed by a testing laboratory
Correct Answer: A
, Explanation: "Approved" means acceptable to the AHJ. While listing is one factor the AHJ
may consider, final approval authority rests with the jurisdiction.
Question 6
A contractor must determine the correct wiring method for a wet location. Per NEC Article
100, which of the following installations is considered a wet location?
A. Under a canopy where water is not likely to accumulate
B. In a crawl space with adequate ventilation
C. In a location subject to saturation with water or other liquids
D. In a concrete slab on grade
Correct Answer: C
Explanation: A wet location includes installations underground, in concrete slabs, in
masonry, or where water or other liquids saturate the equipment. Canopies and ventilated
crawl spaces may be damp locations.
Question 7
A master electrician is supervising an apprentice who is installing raceway in a damp
location. What is the minimum requirement for equipment installed in damp locations per
NEC Section 110.11?
A. Equipment must be listed for the specific purpose and suitable for the environment
B. Equipment must be painted to prevent corrosion
C. Equipment must be energized at reduced voltage
D. Equipment must be inspected monthly
Questions with Correct Answers & Detailed Rationales, NEC 2023,
Electrical Wiring and Circuits, Grounding and Bonding, TDLR
Statutes and Rules, Electrical Calculations, Code Compliance &
Safety Standards
Section 1: National Electrical Code — General Requirements and Definitions (Questions
1–15)
Question 1
Which of the following best describes the purpose of the National Electrical Code as stated
in Article 90?
A. To provide design specifications for electrical engineers
B. To establish minimum requirements for safe electrical installations
C. To mandate the use of specific manufacturer products
D. To ensure electrical systems operate at maximum efficiency
Correct Answer: B
Explanation: The NEC is a minimum safety standard, not a design manual or efficiency guide.
It establishes requirements that protect people and property from electrical hazards.
Question 2
A licensed electrical contractor is planning a commercial installation. According to NEC
Article 100, what is the definition of a "feeder"?
,A. All circuit conductors between the service equipment and the final branch-circuit
overcurrent device
B. The conductors between the utility transformer and the service point
C. The circuit conductors between the branch-circuit overcurrent device and the outlet
D. The conductors that connect the grounding electrode to the earth
Correct Answer: A
Explanation: A feeder supplies power from the service equipment (or separately derived
system) to branch-circuit overcurrent devices. It does not include branch-circuit conductors
or service conductors.
Question 3
A contractor is evaluating an existing installation where the electrical equipment has been
listed by a recognized testing laboratory. What does the term "listed" indicate per NEC
Article 100?
A. The equipment is guaranteed to last for ten years
B. The equipment complies with local building codes
C. The equipment has been tested and found suitable for a specific purpose by an approved
agency
D. The equipment was manufactured in the United States
Correct Answer: C
Explanation: "Listed" means equipment has been evaluated by a nationally recognized
testing laboratory and found suitable for its intended use under specified conditions.
,Question 4
In a commercial building, a junction box is installed in a location that is "accessible" per NEC
definitions. Which statement best describes an accessible wiring method?
A. The wiring can be accessed without damaging the building structure or finish
B. The wiring is located outdoors only
C. The wiring is installed above a suspended ceiling
D. The wiring can only be accessed by licensed electricians
Correct Answer: A
Explanation: Accessibility refers to the ability to reach equipment for inspection,
maintenance, or repair without demolishing structural elements. Above suspended ceilings
may be accessible or not depending on conditions.
Question 5
An electrical contractor is reviewing specifications for a new installation. The term
"approved" as used in the NEC means:
A. Acceptable to the authority having jurisdiction
B. Meets the minimum requirements of the NEC only
C. Approved by the electrical contractor
D. Listed by a testing laboratory
Correct Answer: A
, Explanation: "Approved" means acceptable to the AHJ. While listing is one factor the AHJ
may consider, final approval authority rests with the jurisdiction.
Question 6
A contractor must determine the correct wiring method for a wet location. Per NEC Article
100, which of the following installations is considered a wet location?
A. Under a canopy where water is not likely to accumulate
B. In a crawl space with adequate ventilation
C. In a location subject to saturation with water or other liquids
D. In a concrete slab on grade
Correct Answer: C
Explanation: A wet location includes installations underground, in concrete slabs, in
masonry, or where water or other liquids saturate the equipment. Canopies and ventilated
crawl spaces may be damp locations.
Question 7
A master electrician is supervising an apprentice who is installing raceway in a damp
location. What is the minimum requirement for equipment installed in damp locations per
NEC Section 110.11?
A. Equipment must be listed for the specific purpose and suitable for the environment
B. Equipment must be painted to prevent corrosion
C. Equipment must be energized at reduced voltage
D. Equipment must be inspected monthly
