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Definitions, Theory & Plans — Texas Master Practice Questions

14 questions · 10% of the NEC Knowledge exam

Worked questions

1. A public building is being renovated, and the existing electrical installations are in poor condition. What is the first step that should be taken before any new work can begin?

  • AInstall new electrical panels
  • BRemove all existing electrical installations
  • Perform a detailed electrical inspection
  • DInstall temporary power sources

Exam tip

Always prioritize safety and compliance with the code by performing a detailed electrical inspection before starting any renovation work.

Why C is correct

According to 2026 NFPA 70 NEC Article 90.2, all electrical installations must be inspected and tested before any new work can begin. Options a, b, and d are not the first steps required by the code.

2. A residential building is being wired with 10 AWG copper conductors. What is the maximum allowable length of the conductors between the electrical panel and the first outlet in the branch circuit?

  • A100 feet
  • B150 feet
  • 120 feet
  • D180 feet

Exam tip

Always refer to the specific conductor size and the code for the maximum allowable length.

Why C is correct

According to 2026 NFPA 70 NEC Article 210.100(A), the maximum allowable length of conductors between the electrical panel and the first outlet in a branch circuit is 120 feet for 10 AWG copper conductors. Options a, b, and d exceed this limit.

3. An electrician is inspecting a commercial building's grounding system. Which of the following is a requirement for grounding the service equipment in accordance with 2026 NFPA 70 NEC Article 250.52?

  • AA grounding electrode conductor with a minimum size of 6 AWG
  • A grounding electrode conductor with a minimum size of 8 AWG
  • CA grounding electrode conductor with a minimum size of 10 AWG
  • DA grounding electrode conductor with a minimum size of 12 AWG

Exam tip

Always refer to the specific code requirements for grounding conductor sizes to ensure compliance.

Why B is correct

2026 NFPA 70 NEC Article 250.52(A)(1) specifies that the grounding electrode conductor must be not less than 8 AWG copper or equivalent. Smaller sizes are not acceptable for ensuring adequate grounding.

4. In a retail store, a new branch circuit is being installed for lighting fixtures. The ceiling height is 12 feet. Which type of wiring method is required for this installation?

  • Concealed wiring in ceiling joists
  • BExposed wiring on ceiling joists
  • CConcealed wiring in ceiling plenum
  • DExposed wiring in ceiling plenum

Exam tip

Always check the code requirements for the appropriate wiring method based on the ceiling height and the type of installation.

Why A is correct

According to 2026 NFPA 70 NEC Article 348.4, concealed wiring in ceiling joists is the required method for lighting fixtures in a ceiling height of 12 feet or less. Exposed wiring is not allowed in ceiling joists. Options b, c, and d are not the correct methods for this installation.

10 more in the bank

Answers and explanations for these are in the app.

  • A residential addition is being constructed, and a new electrical panel is required. What is the minimum size of the electrical panel that must be installed to serve the new addition?
  • A Texas Master Electrician is installing electrical wiring in a new residential home. Which of the following is the correct method for installing electrical cable in a concrete block wall?
  • A Texas Master Electrician is reviewing the electrical installation plans for a public building. Which of the following is a requirement for the installation of smoke detectors in accordance with 2026 NFPA 70 NEC Article 700.7?
  • An electrician is designing an overcurrent protection scheme for an industrial facility. Which of the following is the correct rule for selecting the overcurrent protection device for a 480V, 3-phase, 4-wire system?
  • An electrician is inspecting electrical equipment in a healthcare facility. Which of the following is a requirement for the installation of electrical equipment in accordance with 2026 NFPA 70 NEC Article 517.12?
  • An electrician is installing lighting fixtures in a retail store. Which of the following is the correct method for installing a pendant light fixture according to 2026 NFPA 70 NEC Article 410.16?
  • In a commercial establishment, the grounding electrode conductor must be connected to the grounding electrode in a manner that provides a continuous and effective path to the earth. Which of the following methods is NOT acceptable for this connection?
  • In a healthcare facility, a new piece of medical equipment requires a dedicated branch circuit. What is the minimum size of the branch circuit required for this equipment?
  • In an industrial facility, a 3-phase, 4-wire, 480V system is being protected by a 400A main overcurrent device. What is the minimum size of the overcurrent device required for a branch circuit feeding a 3-phase, 4-wire, 208V motor with a full load current of 100A?
  • In an office building, a new lighting fixture is being installed in a ceiling with a slope of 45 degrees. What is the minimum distance required between the bottom of the fixture and the ceiling surface?

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