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Wiring Methods and Materials Flashcards

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

Read the first 7 Wiring Methods and Materials flashcards as text

  1. Intermediate metal conduit (IMC) has walls that are thinner than rigid metal conduit (RMC). Which statement about IMC is correct?

    Answer: IMC is approved for all the same applications as RMC

    NEC 342 lists IMC as suitable for all environments where RMC is permitted, including concrete encasement and direct burial.

  2. What is the required minimum burial depth for rigid metal conduit (RMC) installed under a residential driveway?

    Answer: 12 inches

    NEC Table 300.5 requires RMC and IMC to be buried at least 6 inches under residential driveways.

  3. Type UF cable installed as a direct-buried feeder to an outbuilding must be buried at least how deep under a one-family dwelling's yard?

    Answer: 18 inches

    NEC Table 300.5 requires direct-buried Type UF cable to be at least 24 inches deep, reduced to 18 inches under a dwelling's yard in some applications; the standard general requirement is 24 inches.

  4. Which fitting must be used where electrical metallic tubing (EMT) enters a box to protect conductors from the sharp edge of the tubing?

    Answer: Connector with insulating throat or separate bushing

    NEC 358.46 requires fittings that protect conductors at EMT terminations, typically connectors with an insulating throat.

  5. Non-metallic sheathed cable (NM-B) is permitted to be installed in which of the following locations?

    Answer: Dry locations in wood-frame residential structures

    NM-B cable is restricted to dry locations and is most commonly used in wood-frame, one- and two-family dwellings per NEC 334.10.

  6. When installing service-entrance (SE) cable above a roof with a slope of less than 4 inches in 12 inches, the cable must maintain at least how much clearance above the roof?

    Answer: 18 inches

    NEC 230.24(A) requires SE conductors to maintain 18 inches clearance over flat or low-slope roofs, with exceptions for steep-slope roofs.

  7. Liquidtight flexible metal conduit (LFMC) is required when used in outdoor wet locations primarily because it:

    Answer: Has a PVC jacket that prevents moisture ingress

    LFMC's outer PVC jacket seals out moisture and liquids, making it suitable for wet and outdoor locations unlike plain FMC.