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Electrical Systems Design & Installation Flashcards

7 cards from real CME practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Electrical Systems Design & Installation flashcards as text

  1. When calculating voltage drop for a 120V, 1-phase circuit with #12 AWG copper conductors running 150 feet to a 16A continuous load, which formula applies?

    Answer: VD = (2 × K × I × D) / CM

    For single-phase circuits, voltage drop = (2 × K × I × D) / CM, where the factor of 2 accounts for both the line and neutral conductors carrying current.

  2. A wet location requires conduit installation. Which raceway system is NOT approved for wet locations per NEC Chapter 3?

    Answer: Electrical Metallic Tubing (EMT)

    EMT (Electrical Metallic Tubing) is listed for wet locations only when all fittings are listed for wet locations; however, EMT itself without proper fittings is not suitable, but the primary concern is that EMT fittings must be rain-tight/wet-location listed.

  3. What is the minimum size copper equipment grounding conductor required for a circuit protected by a 400A overcurrent device per NEC Table 250.122?

    Answer: #3 AWG

    Per NEC Table 250.122, a 400A overcurrent device requires a minimum #3 AWG copper equipment grounding conductor.

  4. In a data center design, which NEC article addresses critical operations power systems (COPS) that must remain energized during utility outages?

    Answer: Article 708

    NEC Article 708 covers Critical Operations Power Systems (COPS) designed to remain operable during a wide-scale emergency that poses a threat to national security.

  5. When installing parallel conductors for a 1200A feeder, what is the minimum conductor size permitted for paralleling per NEC 310.10(H)?

    Answer: #1/0 AWG

    NEC 310.10(H)(1) requires that conductors intended for parallel operation be 1/0 AWG or larger.

  6. A manufacturing facility installs a new 2000A service. Per NEC 230.95, ground-fault protection of equipment (GFPE) is required for solidly grounded wye services above what voltage and ampere rating?

    Answer: 480Y/277V services 1000A and above

    NEC 230.95 requires GFPE for solidly grounded wye services of more than 150V to ground but not exceeding 600V phase-to-phase, rated 1000A or more (typically 480Y/277V systems).

  7. What is the maximum length of a flexible metal conduit (FMC) connection to a motor per NEC 356.60(A)?

    Answer: 6 feet

    NEC 356.60(A) limits FMC used for motor connections to a maximum of 6 feet where flexibility is needed to minimize vibration transmission or allow motor adjustment.