Equipment & Devices — Texas Master Practice Questions

14 questions · 10% of the NEC Knowledge exam

Worked questions

1. A residential circuit is protected by a 20A circuit breaker. What is the minimum size wire that can be used for this circuit?

A14 AWG
12 AWG
C10 AWG
D8 AWG

Exam tip

Always refer to the specific wire ampacity requirements for the correct wire size.

Why B is correct

According to 2026 NEC Article 210.3(B), the minimum wire size for a 20A circuit is 12 AWG. The 14 AWG wire is suitable for 15A circuits, and the 10 AWG and 8 AWG wires are for 30A and 40A circuits, respectively.

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.

3. In a residential bedroom circuit, which type of AFCI is required according to the 2026 NEC?

Type B
BType C
CType D
DType E

Exam tip

Understand the specific requirements for AFCI types in different residential applications.

Why A is correct

The 2026 NEC mandates the use of Type B AFCIs in bedroom circuits, which are designed to detect arcing conditions in 15- and 20-ampere, 120/240-volt circuits.

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. In an outdoor area, what is the minimum requirement for GFCI protection for receptacle outlets?

ANone
1 GFCI-protected receptacle per 10 linear feet
C1 GFCI-protected receptacle per 20 linear feet
D1 GFCI-protected receptacle per 30 linear feet

Exam tip

Understand the GFCI requirements for different areas to ensure compliance with safety standards.

Why B is correct

According to 2026 NEC Article 210.8(B), at least one GFCI-protected receptacle is required per 10 linear feet in outdoor areas. The other options are not the correct requirements.

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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Equipment & Devices — Texas Master Practice Questions

Worked questions

1. A residential circuit is protected by a 20A circuit breaker. What is the minimum size wire that can be used for this circuit?

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?

3. In a residential bedroom circuit, which type of AFCI is required according to the 2026 NEC?

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

5. In an outdoor area, what is the minimum requirement for GFCI protection for receptacle outlets?

9 more in the bank

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