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Services & Derived Systems — Texas Master Practice Questions

23 questions · 16% of the NEC Knowledge exam

Worked questions

2. In a commercial building, all electrical equipment must be bonded to the grounding system. Which of the following is NOT a requirement for bonding electrical equipment?

  • ABonding jumpers must be of the same material as the equipment.
  • BBonding jumpers must be of adequate size to carry the fault current.
  • Bonding jumpers must be installed in a visible location.
  • DBonding jumpers must be connected to the grounding electrode system.

Exam tip

Ensure you understand the specific requirements for bonding jumpers and grounding systems.

Why C is correct

According to 250.64(A), bonding jumpers must be of adequate size to carry the fault current, connected to the grounding electrode system, and of the same material as the equipment. The requirement for bonding jumpers to be installed in a visible location is not specified in the NEC.

3. In a healthcare facility, what is the minimum size of the grounding conductor required for a 120/208-volt, 3-phase, 4-wire service?

  • A3/4 inch
  • 1 inch
  • C1 1/4 inch
  • D1 1/2 inch

Exam tip

Always refer to the specific voltage and phase configuration in the NEC when determining the minimum grounding conductor size.

Why B is correct

According to 2026 NEC 250.104(A), the minimum size of the grounding conductor for a 120/208-volt, 3-phase, 4-wire service is 1 inch. The other options are not specified for this voltage and phase configuration.

6. Which type of cable is suitable for use in wet locations according to 2026 NEC 330.12?

  • AType MC
  • BType NM-B
  • Type THWN-2
  • DType SJ

Exam tip

Remember the specific codes for cable types suitable for wet locations to avoid installation errors.

Why C is correct

Type THWN-2 cable is suitable for use in wet locations as per 2026 NEC 330.12. Type MC is for general use, NM-B is for dry locations, and Type SJ is for dry locations and limited wet locations.

7. Which type of wiring method is typically used for outdoor installations where flexibility and durability are required?

  • Armored Cable
  • BRiser Cable
  • CConduit
  • DDirect Burial Cable

Exam tip

Be familiar with the different types of wiring methods and their applications.

Why A is correct

Armored Cable is designed for outdoor use and provides flexibility and durability. Riser Cable and Conduit are typically used for indoor installations, while Direct Burial Cable is used for underground installations without conduit.

16 more in the bank

Answers and explanations for these are in the app.

  • A 20-ampere, 120/240-volt branch circuit is being installed in a residential kitchen. What is the minimum size of the conductor required for this circuit?
  • A 200-ampere, single-phase, 120/240-volt service is installed in a residential building. The service disconnecting means is located in a separate equipment room. What is the minimum size of the equipment room required per NEC 230.6(A)?
  • A residential building has a 200-ampere main service. What is the minimum size of the grounding electrode conductor required?
  • For a system where the grounded conductor is not required to be run with the circuit conductors, what is the minimum grounding electrode conductor size required according to NEC 250.66(A)?
  • In a commercial building, what type of cable is required to be installed in a wet location according to NEC 300.4(B)(2)?
  • In a healthcare facility, what is the minimum number of emergency power outlets required per patient room?
  • In a high-rise building, what is the maximum spacing allowed between vertical runs of metal conduit for 120-volt, single-phase, 15-ampere branch circuits?
  • In a public assembly building, what is the maximum number of 20-ampere branch-circuit overcurrent devices that can be installed on a single 100-ampere branch-circuit according to NEC 210.14(A)?
  • In a residential dwelling unit, what is the minimum level of protection required for bedroom outlets according to NEC 210.12(A)(4)?
  • In an industrial plant, what is the minimum size of the grounding conductor required for a 480-volt, 3-phase, 4-wire system?
  • In an industrial setting, what is the maximum allowable time delay for a 480-volt, 3-phase, 4-wire circuit breaker?
  • In an institutional building, what is the minimum vertical spacing required between luminaires in a vertical row according to NEC 410.16(C)?
  • What is the minimum grounding electrode conductor size required for a 400-ampere service in a public assembly building?
  • What is the minimum height above the finished floor required for a wall-mounted lighting fixture in a retail establishment?
  • When installing a new electrical outlet in a residential remodeling project, what is the minimum distance from the edge of a countertop to the center of the outlet?
  • Which type of lighting fixture is typically used in office buildings to provide general lighting?

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