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Electrical Systems Inspection Flashcards

7 cards from real CMI 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 Inspection flashcards as text

  1. According to NEC 230.79, what is the minimum service ampacity required for a single-family dwelling?

    Answer: 100 amps

    NEC 230.79 requires a minimum 100-amp service for single-family dwellings, though 200 amps is the modern standard for new construction.

  2. Which type of wiring commonly found in homes built before 1950 is flagged during inspections primarily because it lacks a ground conductor?

    Answer: Knob-and-tube wiring

    Knob-and-tube wiring has only two conductors (hot and neutral) with no ground wire, and its cloth insulation is often degraded, making it a safety concern.

  3. Under current NEC standards, bedrooms must be protected by which device to guard against arc-fault-initiated fires?

    Answer: AFCI circuit breakers or combination AFCI devices

    The NEC requires Arc Fault Circuit Interrupter (AFCI) protection for bedroom circuits because arcing in wiring or cords is a leading cause of residential fires.

  4. A home inspector observes two conductors connected under a single breaker terminal in the main panel. What deficiency does this represent?

    Answer: Double-tapping: two conductors under a terminal not listed for that configuration, creating a fire and fault risk

    Double-tapping means two wires share a breaker terminal not rated for dual conductors, which can cause loose connections, arcing, and overheating.

  5. Per NEC 240.24, the center of the operating handle of a circuit breaker in the highest position must not exceed what height from the floor?

    Answer: 6 feet 7 inches

    NEC 240.24(A) limits the center of the grip of the operating handle to a maximum of 6 feet 7 inches (2.0 m) above the floor so breakers remain accessible.

  6. When inspecting bathroom receptacle outlets, which statement best describes the GFCI protection requirement under current NEC?

    Answer: All bathroom receptacle outlets require GFCI protection regardless of distance from water

    The NEC requires GFCI protection for all receptacle outlets in bathrooms regardless of their location within the room.

  7. What is the correct copper wire gauge for a 20-amp dedicated circuit, such as a kitchen small-appliance circuit?

    Answer: 12 AWG

    12 AWG copper wire is rated for 20-amp circuits; using 14 AWG (rated 15 amps) on a 20-amp breaker would be an over-fusing hazard.