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Wiring Methods & Installation Practices Flashcards

7 cards from real CEA 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 & Installation Practices flashcards as text

  1. What is the minimum wire fill percentage allowed in a conduit according to NEC Chapter 9 for three or more conductors?

    Answer: 31%

    For three or more conductors, NEC Chapter 9 allows a maximum conduit fill of 40%, but the standard fill for three or more conductors is 40% not to exceed.

  2. Which type of conduit fitting is required when connecting RMC to an enclosure to maintain a grounding path?

    Answer: Bonding locknut or bonding bushing

    A bonding locknut or bonding bushing is required where a reliable grounding path must be maintained at RMC enclosure connections.

  3. What is the maximum spacing between supports for 1-inch EMT installed horizontally?

    Answer: 10 feet

    EMT 1 inch and larger must be supported at intervals not exceeding 10 feet when installed horizontally.

  4. Underground feeder cable (Type UF) used as interior wiring must comply with which wiring method requirements?

    Answer: UF cable used inside must comply with NM cable rules

    When Type UF cable is used inside a building, it must be installed in the same manner as Type NM cable per NEC requirements.

  5. Where must expansion fittings be installed in a PVC conduit run?

    Answer: Where the conduit crosses building expansion joints or where thermal expansion exceeds conduit's flexibility

    Expansion fittings must be installed where conduit crosses building expansion joints or where significant thermal expansion would stress the conduit system.

  6. Type MC cable used in wet locations must have which type of jacket?

    Answer: Lead sheath or PVC jacket listed for wet locations

    Type MC cable in wet locations must have a corrosion-resistant jacket, such as a PVC outer jacket listed for wet locations or a lead sheath.

  7. What is the purpose of an anti-short bushing (red devil) in armored cable installations?

    Answer: To protect conductor insulation from the cut armor's sharp edges

    Anti-short bushings (also called red devils or anti-short connectors) are installed inside AC cable armor to protect conductor insulation from sharp metal edges.