Practice Test Geeks(InterNACHI) International Association of Certified Home Inspectors Practice Test
← All INTERNACHI Flashcard Decks

Electrical Systems & Safety Flashcards

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

Read the first 7 Electrical Systems & Safety flashcards as text

  1. An arc-fault circuit interrupter (AFCI) breaker is designed to protect against which specific hazard?

    Answer: Electrical arcing that can ignite nearby combustibles

    AFCI breakers detect the unique electrical signature of arcing faults, which can cause fires in walls or other concealed locations.

  2. What is the correct term for the main disconnect switch that cuts power to the entire home's electrical system?

    Answer: Main breaker

    The main breaker is the primary overcurrent protection device that disconnects all power to the home's branch circuits and feeders.

  3. A home inspector finds knob-and-tube wiring in an attic that has been covered with insulation. Why is this a concern?

    Answer: Knob-and-tube wiring requires ventilation to dissipate heat, and insulation prevents this

    Knob-and-tube wiring relies on open air for heat dissipation, and burying it in insulation can cause dangerous overheating.

  4. What does the term 'service drop' refer to in a residential electrical inspection?

    Answer: The overhead utility conductors from the pole to the weatherhead

    The service drop refers to the overhead conductors supplied by the utility company that run from the utility pole to the customer's weatherhead.

  5. Which of the following is a common defect found with older two-prong (ungrounded) receptacles?

    Answer: They have no equipment grounding conductor, offering no protection against faults

    Two-prong receptacles lack the grounding conductor, meaning there is no path to safely divert fault current away from users or equipment.

  6. What is the minimum burial depth for UF (underground feeder) cable supplying a residential outdoor circuit?

    Answer: 12 inches

    NEC requires UF cable to be buried a minimum of 12 inches deep for residential branch circuits, though RMC conduit allows shallower burial.

  7. A home inspector observes a sub-panel installed in a bathroom. What is the concern?

    Answer: Sub-panels are not permitted in bathrooms due to moisture hazard

    NEC prohibits the installation of electrical panels in bathrooms because of the elevated moisture and shock hazard in that environment.