Practice Test Geeks(CEP) Certified Electrical Professional Practice Test
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Installation & Maintenance Practices Flashcards

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

Read the first 7 Installation & Maintenance Practices flashcards as text

  1. What is the purpose of bonding a metal water pipe system to the electrical service per NEC 250.104?

    Answer: To provide a low-impedance fault current path and equalize potentials

    NEC 250.104 requires bonding metal water piping to limit voltage differences and provide a low-impedance path for fault current to operate overcurrent protection.

  2. During a megohmmeter (megger) test on a 480V motor winding, a reading of 1 MΩ is obtained. How should this be interpreted?

    Answer: Marginal insulation requiring investigation and monitoring

    Per IEEE 43, a minimum acceptable insulation resistance for a 480V motor is 1 MΩ, which is marginal and warrants further investigation and trending.

  3. When installing a new branch circuit, a technician needs to connect to a panelboard that is energized. What is the FIRST safety step?

    Answer: Perform an arc flash risk assessment and don appropriate PPE

    NFPA 70E requires an arc flash risk assessment and appropriate PPE (arc flash suit, gloves, face shield) before working on or near energized electrical equipment.

  4. What is the correct installation practice for a cable tray containing both power and signal cables?

    Answer: Use a solid divider or separate trays to segregate power and signal cables

    NEC 392.46 and good engineering practice require physical separation or solid barriers between power conductors and signal/communication cables to prevent inductive interference.

  5. A 3-phase, 208V panel serves a 10 kVA balanced load. What is the approximate full-load current per phase?

    Answer: 27.8 A

    I = kVA / (√3 × V) = 10,000 / (1.732 × 208) = 10,000 / 360.3 ≈ 27.8 A per phase.

  6. Under NEC 230.70, where must the main service disconnecting means be located?

    Answer: At the nearest readily accessible location to the service entrance conductors

    NEC 230.70(A)(1) requires the service disconnect to be installed at a readily accessible location nearest to the point where the service conductors enter the building.

  7. When performing infrared (IR) thermography on electrical panels, what condition indicates a potential problem requiring immediate attention?

    Answer: A connection point showing 30°C above adjacent similar components

    NETA and NFPA 70B guidelines classify a temperature difference of ≥30°C above a reference point on similar components as a serious deficiency requiring immediate corrective action.