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Wiring Methods and Materials Flashcards

7 cards from real IEC 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. Which of the following wiring methods is permitted for use in wet locations as a standalone installation (without additional enclosure)?

    Answer: Liquidtight flexible metal conduit (LFMC)

    Liquidtight flexible metal conduit (LFMC) is listed for use in wet locations per NEC 350.10.

  2. How many 90-degree bends are permitted between pull points in a conduit run?

    Answer: Four 90-degree bends (360 degrees total)

    NEC 358.26, 344.26, and related articles limit total bends between pull points to 360 degrees (four 90-degree bends).

  3. Type TC (Tray Cable) is most commonly installed in which environment?

    Answer: Open cable tray systems in industrial facilities

    Type TC cable is specifically designed and listed for use in cable tray systems, per NEC Article 336.

  4. When installing EMT in a corrosive environment, which protection method is required?

    Answer: A different wiring method suitable for corrosive conditions must be used or the EMT must be listed for the environment

    NEC 358.10(B) states that EMT shall not be used where subject to severe corrosive influences unless protected by a corrosion-resistant material or a different method is used.

  5. What is the minimum size trade-size conduit permitted to contain conductors used in wiring methods requiring conduit?

    Answer: 1/2 inch

    The minimum permitted trade size for conduit is 1/2 inch per NEC 358.20, 344.20, and similar articles for most conduit types.

  6. When NM cable passes through a floor, what protection is required?

    Answer: The cable must be protected by a minimum 6-inch guard from the floor and a bushing at the top

    NEC 334.15(C) requires NM cable passing through a floor to be enclosed in rigid metal conduit, IMC, Schedule 80 PVC, or equivalent protection for at least 6 inches above the floor, with a bushing at the top.

  7. Which statement is correct regarding the use of flexible metal conduit (FMC) as an equipment grounding conductor?

    Answer: FMC listed at 3/8-inch trade size and not exceeding 6 feet may serve as the EGC under certain conditions

    NEC 250.118(5) permits FMC to serve as an EGC when the trade size is 3/8 to 1-1/4 inches and the length does not exceed 6 feet, among other conditions.