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Wiring Methods and Materials Flashcards

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Read the first 7 Wiring Methods and Materials flashcards as text

  1. Surface metal raceways installed in dry locations are required to be listed and may NOT be used in which location?

    Answer: Hoistways

    NEC 386.12 prohibits surface metal raceways in hoistways and locations subject to severe physical damage, among other restricted areas.

  2. When conductors are installed in parallel, each set of parallel conductors must:

    Answer: Be the same length, same conductor material, same AWG, and same type of insulation

    NEC 310.10(H) requires parallel conductors to be the same length, material, circular mil area, insulation type, and termination method to ensure equal current sharing.

  3. Conduit fill for three or more conductors in a conduit is limited to what percentage of the conduit's interior cross-sectional area?

    Answer: 40%

    NEC Chapter 9 Table 1 limits conduit fill to 40% for three or more conductors, balancing wire-pulling ease and heat dissipation.

  4. What wiring method uses a factory assembly of one or more insulated conductors under an overall nonmetallic sheath, approved for direct burial?

    Answer: Type UF

    Type UF (Underground Feeder) cable is specifically listed for direct burial and wet locations, unlike NM-B which is for dry indoor use only.

  5. A grounding conductor is required in flexible metal conduit (FMC) when the FMC exceeds what length?

    Answer: 6 feet

    NEC 348.60 permits FMC to serve as an equipment grounding conductor only when 6 feet or less in length and meeting other conditions; beyond 6 feet a separate EGC is required.

  6. When installing cable trays in an industrial establishment, which cable type is NOT listed for use in cable tray systems?

    Answer: Type NM-B cable

    Type NM-B (nonmetallic sheathed cable) is not listed for use in cable trays; NEC 392.10 specifies which cables and conductors are approved for tray installations.

  7. A reducer bushing used when reducing conduit size at a pull box must be approved and installed so that conductors are protected from:

    Answer: Abrasion at the conduit opening

    NEC 300.16 requires fittings at conduit openings to protect conductors from abrasion caused by the sharp edges of conduit ends.