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CME Motors, Controls & Industrial Wiring Flashcards

6 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 6 CME Motors, Controls & Industrial Wiring flashcards as text

  1. Per NEC 430.102(B), what is required at the location where a motor disconnect is not within sight of the motor controller?

    Answer: The disconnect must be lockable in the open position

    NEC 430.102(B) allows a motor disconnecting means that is not within sight of the motor if it can be locked in the open (off) position.

  2. Which control circuit wiring method is required by NEC 725.136 when control conductors are installed in the same raceway as power conductors?

    Answer: Control conductors must be rated for the voltage of the power conductors

    NEC 725.136(A) requires that Class 1 circuit conductors installed with power conductors be rated for the maximum voltage present in the raceway.

  3. What is the purpose of a contactor's auxiliary contact in a motor control circuit?

    Answer: Provide a holding circuit to maintain the contactor energized after the start button is released

    The normally-open auxiliary (sealing) contact creates a parallel path around the momentary start pushbutton, latching the coil circuit closed after the button is released.

  4. For a three-phase induction motor, which condition is indicated when all three phase currents are balanced but slightly above FLA?

    Answer: Motor is overloaded beyond its rated mechanical output

    Balanced currents above FLA across all three phases indicate the mechanical load exceeds the motor's rated horsepower output, not an electrical fault.

  5. What is the minimum required short-circuit current rating (SCCR) for industrial control panels per NEC 409.22?

    Answer: Must be equal to or greater than the available fault current at the panel's supply terminals

    NEC 409.22 requires the marked SCCR of an industrial control panel to be not less than the available short-circuit current at its supply terminals.

  6. A motor nameplate shows: 460V, 3Ø, 60Hz, 25HP, 1.15 SF. What is the maximum continuous current the motor can draw without damaging the insulation?

    Answer: FLA multiplied by the 1.15 service factor

    The service factor indicates the motor can operate continuously at 1.15 × FLA (nameplate current × SF) without exceeding its thermal limits.