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Equipment & Devices — Texas Master Practice Questions

14 questions · 10% of the NEC Knowledge exam

Worked questions

2. In a commercial building, the metal frames of interior partitions must be bonded to the grounding electrode system. What is the minimum size bonding jumper required according to the 2026 NEC?

  • A6 AWG
  • 8 AWG
  • C10 AWG
  • D12 AWG

Exam tip

Always check the specific bonding requirements for different types of metal structures and systems.

Why B is correct

The 2026 NEC requires a minimum 8 AWG bonding jumper to connect the metal frames of interior partitions to the grounding electrode system, ensuring proper bonding and fault current path.

4. In a residential dwelling, which rooms are required to have AFCI protection?

  • All bedrooms
  • BLiving rooms and dining rooms
  • CKitchen and bathrooms
  • DBasement and attic

Exam tip

Remember the specific requirements for AFCI protection in residential installations.

Why A is correct

According to 2026 NEC Article 210.12(A), AFCI protection is required in all bedrooms. The other options are not specifically required for AFCI protection.

5. At a dwelling, a new outdoor general-purpose receptacle is supplied by a 120-volt, single-phase, 20-ampere branch circuit. For this installation under the 2026 NEC, which GFCI statement is correct?

  • ANo GFCI protection is needed outdoors
  • This receptacle requires GFCI protection
  • CProtection is needed only for one receptacle per 20 linear feet
  • DProtection is needed only for one receptacle per 30 linear feet

Where to look it up

https://www.eaton.com/us/en-us/products/residential/nec-2026-updates/dwelling-unit.html

Why B is correct

Eaton’s official 2026 NEC dwelling guide identifies GFCI protection for outdoor 125-volt receptacles; the described 120-volt circuit falls in that application. The requirement protects this receptacle, rather than an invented one-per-length quota. This question concerns an ordinary dwelling receptacle, not every possible outdoor outlet or a non-dwelling occupancy. Source: https://www.eaton.com/us/en-us/products/residential/nec-2026-updates/dwelling-unit.html

9 more in the bank

Answers and explanations for these are in the app.

  • A 120-volt, 50-watt T8 fluorescent lamp is being installed in an industrial setting. What is the minimum size conductor required for the lamp, according to the 2026 NEC?
  • A high-bay industrial lighting fixture requires a 277V power supply. What type of transformer should be used to step down the voltage to 120V for the fixture?
  • A new residential addition requires an additional electrical panel. What is the minimum size of the main disconnecting means required for this panel?
  • A residential service panel has a 200-ampere main lugs. What is the minimum size conductor required to connect the panel to the meter base, according to the 2026 NEC?
  • An industrial motor with a full-load current of 100 amperes is being installed. What is the minimum size overcurrent protection device required for the motor, according to the 2026 NEC?
  • In a commercial building, the grounding electrode conductor must be connected to the grounding electrode. What is the minimum size of the grounding electrode conductor required?
  • In a commercial building, the grounding electrode conductor must be connected to the service equipment. Which of the following is the correct method of connection according to the 2026 NEC?
  • In a commercial kitchen, what type of wiring method is typically used for the power supply to cooking equipment?
  • In a high-rise building, what is the minimum size of the service equipment required for a 1000A service?

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