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Wiring Methods and Installation Flashcards

7 cards from real TN LLE 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 Installation flashcards as text

  1. According to NEC 310.10(H), conductors connected in parallel must be what minimum size?

    Answer: 1/0 AWG or larger

    NEC 310.10(H) permits conductors to be connected in parallel only if they are 1/0 AWG or larger.

  2. Per NEC Table 310.15(C)(1), when 4 to 6 current-carrying conductors are bundled together in a raceway, the ampacity must be derated to what percentage of the base table value?

    Answer: 80%

    NEC Table 310.15(C)(1) requires an 80% derating factor when 4 to 6 current-carrying conductors are bundled in the same raceway.

  3. According to NEC 330.30, Type MC cable must be secured at intervals not exceeding:

    Answer: 6 feet

    NEC 330.30 requires Type MC cable to be supported and secured at intervals not exceeding 6 feet.

  4. Under NEC 358.30, EMT (Electrical Metallic Tubing) must be secured at intervals not exceeding:

    Answer: 10 feet

    NEC 358.30 requires EMT to be secured at least every 10 feet and within 3 feet of each outlet box, junction box, or other enclosure.

  5. Under NEC 350.60, Flexible Metal Conduit (FMC) is permitted to serve as the sole equipment grounding conductor only if the total ground return path length does not exceed:

    Answer: 6 feet

    NEC 350.60 permits FMC to serve as the equipment grounding conductor if the ground return path length does not exceed 6 feet and the circuit overcurrent device does not exceed 20 amperes.

  6. Which of the following best describes a permitted use of Liquidtight Flexible Nonmetallic Conduit (LFNC) per NEC Article 356?

    Answer: Lengths up to 6 feet where flexibility or protection from liquids is needed

    NEC 356.10 permits LFNC in lengths up to 6 feet where flexibility or protection from liquids, vapors, or solids is required.

  7. When a conduit exits a concrete floor slab, NEC 300.4(F) requires that conductors be protected from abrasion by:

    Answer: A listed bushing or equivalent protection at the point where the conduit exits

    NEC 300.4(F) requires a listed bushing or equivalent protection where conductors emerge from conduit at floor level to prevent abrasion damage.