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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. When conductors of different systems (e.g., 120V and 277V) are installed in the same raceway, what is required?

    Answer: All conductors must be insulated for the maximum voltage present in the raceway

    NEC 300.3(C)(1) requires that when conductors of different systems share a raceway, all conductors must be insulated for the maximum voltage of any conductor in the raceway.

  2. Which of the following is a key distinction between intermediate metal conduit (IMC) and rigid metal conduit (RMC)?

    Answer: IMC has thinner walls than RMC but is still suitable for the same applications

    IMC has thinner walls than RMC, making it lighter and easier to work with, yet is listed for the same applications under NEC Article 342.

  3. What is the maximum distance between supports for 1-inch rigid PVC conduit (Schedule 40) installed horizontally?

    Answer: 5 feet

    NEC Table 352.30(B) requires horizontal supports for 1-inch Schedule 40 PVC conduit at maximum 5-foot intervals.

  4. Type MI (Mineral Insulated) cable is best suited for which demanding application?

    Answer: High-temperature and fire-rated circuit applications

    Type MI cable uses compressed magnesium oxide insulation and a metal sheath, making it ideal for high-temperature and fire-rated circuit applications per NEC Article 332.

  5. When running NM cable through a 2x4 wood stud, the hole must be drilled at what minimum distance from the edge of the stud to avoid requiring a nail plate?

    Answer: 1-1/4 inches

    NEC 300.4(A)(1) requires holes for cables through wood framing members to be at least 1-1/4 inches from the nearest edge, or a nail plate must be installed.

  6. Liquidtight flexible nonmetallic conduit (LFNC) is limited to a maximum length of how many feet in most applications?

    Answer: 6 feet

    NEC 356.60 limits LFNC to a maximum length of 6 feet in most applications to prevent excessive voltage drop and maintain circuit integrity.

  7. What is required when a wiring method passes through a fire-rated wall or floor assembly?

    Answer: The opening must be firestopped with an approved material to restore the fire rating

    NEC 300.21 requires that openings in fire-rated assemblies be firestopped using approved methods to maintain the integrity of the fire resistance rating.