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Wiring Methods & Materials Flashcards

7 cards from real NEC 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 & Materials flashcards as text

  1. Which of the following is a permitted use of Type AC (armored cable)?

    Answer: In dry locations where not subject to physical damage

    NEC 320.10 permits Type AC cable in dry locations where not exposed to physical damage, such as in concealed wall or ceiling spaces.

  2. What is the minimum cover requirement for RMC installed under a 4-inch concrete slab that is not subject to vehicular traffic?

    Answer: 0 inches — no cover required

    NEC Table 300.5 permits RMC under a concrete slab at least 4 inches thick to have no minimum burial cover requirement.

  3. In a raceway system, what must be done when the raceway is used as a sleeve through a fire-rated wall?

    Answer: The raceway must be sealed with a listed fire-stop material

    NEC 300.21 requires that openings around electrical penetrations through fire-resistant-rated walls be sealed with a listed fire-stop system to maintain the fire rating.

  4. What is the ampacity correction factor that must be applied when four current-carrying conductors are bundled together in a cable tray?

    Answer: 0.80 (80%)

    NEC Table 310.15(C)(1) requires an 80% ampacity correction factor when 4 to 6 current-carrying conductors are bundled or stacked.

  5. Type USE (underground service entrance) cable is rated for which of the following?

    Answer: Direct burial underground service applications

    NEC Article 338 covers Type USE cable, which is listed for direct burial and underground service entrance applications.

  6. When conductors are installed in a conduit exposed to sunlight on a rooftop, what additional temperature adder must be applied to the ambient temperature?

    Answer: 17°C

    NEC 310.15(B)(3)(c) requires adding 17°C to the outdoor ambient temperature for conductors in conduit exposed to sunlight on or above a rooftop.

  7. Which statement about installing LFMC (liquidtight flexible metal conduit) is correct?

    Answer: It is permitted in lengths up to 6 feet for motor connections

    NEC 350.20(A) permits LFMC in lengths not exceeding 6 feet as a final connection to motors or equipment requiring flexibility.