Practice Test Geeks(CEI) Certified Electrical Inspector Practice Test
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Residential Electrical Inspection Flashcards

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

Read the first 7 Residential Electrical Inspection flashcards as text

  1. Under NEC 250.122, if a 20A circuit has its circuit breaker replaced with a 30A breaker, what is the minimum required size for the equipment grounding conductor (EGC)?

    Answer: 10 AWG copper

    NEC Table 250.122 requires a minimum 10 AWG copper EGC for overcurrent devices rated 30A; increasing the breaker size requires upsizing the EGC accordingly.

  2. An inspector finds recessed lighting fixtures in direct contact with attic insulation. The fixtures are marked 'IC'. What does this marking indicate?

    Answer: The fixture is rated for insulation contact and can be covered by insulation

    IC-rated recessed fixtures are designed and listed for direct contact with thermal insulation, while non-IC fixtures must maintain a 3-inch clearance per NEC 410.116.

  3. What is the minimum burial depth for a 120V residential branch circuit wiring method using UF cable under a residential driveway per NEC Table 300.5?

    Answer: 24 inches

    NEC Table 300.5 requires UF cable under driveways to be buried a minimum of 24 inches due to vehicle traffic loads.

  4. During a final inspection of a new single-family home, the inspector notices the electric dryer outlet is wired with a 3-wire connection (no separate equipment ground). When is this permitted?

    Answer: Only when connecting to an existing outlet in an existing branch circuit

    NEC 250.140 permits the continued use of 3-wire connections for ranges and dryers only when connecting to an existing outlet in an existing branch circuit; all new installations require a 4-wire connection.

  5. A residential garage has been converted into a living space. Which NEC requirement now applies that did not apply when it was a garage?

    Answer: AFCI protection for the branch circuits serving the converted space

    When a garage is converted to a living area, NEC 210.12 requires AFCI protection for all 120V, 15 and 20A branch circuits serving the dwelling unit space.

  6. What is the maximum number of conductors allowed in a standard 4x4x1.5 inch metal junction box when using 12 AWG wire, assuming no devices or clamps inside the box?

    Answer: 8

    A 4x4x1.5-inch box has a volume of 21 cubic inches, and 12 AWG conductors each count as 2.25 cubic inches per NEC Table 314.16(A), yielding a maximum of 9 conductors — but with no clamps or devices, the calculation yields 9; however the standard metal 4×4×1.5 box has 21 cu in volume, 21÷2.25=9 conductors maximum.

  7. Under NEC 230.79, what is the minimum ampere rating required for the service disconnecting means of a single-family dwelling?

    Answer: 100 amperes

    NEC 230.79(C) requires the service disconnecting means for a single-family dwelling to have a rating of not less than 100 amperes, 3-wire.