Practice Test Geeks(E2) E2 Commercial Electrical Inspector Practice Test
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Systems and Equipment Flashcards

7 cards from real E2 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Systems and Equipment flashcards as text

  1. When inspecting a commercial fire alarm system, the inspector notes that the NAC (Notification Appliance Circuit) uses Class B wiring. What distinguishes Class B from Class A wiring?

    Answer: Class B has no return path and a single open fault can disable devices beyond the fault

    Class B (Style B) NAC circuits do not loop back to the panel, so a single wire break can disable all devices beyond that point.

  2. A 480V, 3-phase transformer feeding a 120/208V panelboard in a commercial building must have its secondary protected at no more than what percentage of the transformer's rated secondary current when using a standard fuse?

    Answer: 125%

    NEC 450.3(B) allows secondary overcurrent protection up to 125% of the transformer's rated secondary current for a supervised installation.

  3. In a commercial occupancy, the NEC requires that luminaires installed in a clothes closet must maintain what minimum clearance from the storage area?

    Answer: 12 inches

    NEC 410.16(C) requires incandescent and LED luminaires to maintain at least 12 inches of clearance from the defined storage space in closets.

  4. An inspector finds that a commercial building's panelboard has all circuit breakers fully populated with no spare spaces. Under the NEC, this is:

    Answer: Acceptable if the load is under 80% of panel capacity

    The NEC does not require spare breaker spaces in a panelboard; 100% population is permitted as long as the calculated load does not exceed the panelboard rating.

  5. For a commercial elevator installation, the NEC requires a separate branch circuit for which of the following?

    Answer: The elevator cab lighting, receptacle, and ventilation on a separate circuit from the motor

    NEC 620.22 requires a separate branch circuit for elevator car lighting, receptacle outlets, and ventilation, independent of the elevator motor circuit.

  6. When inspecting a commercial pool pump motor installation, which bonding requirement is unique compared to standard motor installations?

    Answer: All metal parts within 5 feet of the pool, including the motor, must be bonded together with a solid copper conductor no smaller than 8 AWG

    NEC 680.26 requires all metal parts within 5 feet of the pool water surface to be bonded together using a solid copper bonding conductor not smaller than 8 AWG solid.

  7. A commercial building's uninterruptible power supply (UPS) system has a bypass switch. The NEC requires this bypass to:

    Answer: Allow maintenance without de-energizing the critical load

    NEC 700.3(F) requires UPS systems serving emergency loads to have a bypass that allows maintenance without interrupting power to the critical load.