Practice Test Geeks(CME) Certified Master Electrician Practice Test
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System Design and 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.

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  1. In designing a hospital critical branch circuit, what is the maximum transfer time required to restore power after normal power loss per NFPA 99?

    Answer: 10 seconds

    NFPA 99 requires the critical branch of the essential electrical system to be restored within 10 seconds of normal power interruption.

  2. A master electrician is sizing conductors for a 208V, 3-phase motor with a full-load current of 40A. What is the minimum conductor ampacity required per NEC 430.22?

    Answer: 50A

    NEC 430.22 requires motor branch circuit conductors to have an ampacity of not less than 125% of the motor full-load current: 40A × 1.25 = 50A.

  3. When installing a photovoltaic system, what is the maximum voltage of a PV source circuit permitted in a one- or two-family dwelling per NEC 690.7?

    Answer: 600V DC

    NEC 690.7(A) limits PV system voltage in one- and two-family dwellings to a maximum of 600V DC.

  4. What is the purpose of a system bonding jumper in a separately derived system per NEC 250.30?

    Answer: To connect the grounded conductor to the equipment grounding conductor at the source

    The system bonding jumper connects the grounded conductor (neutral) to the equipment grounding conductor and to the enclosure at the source of a separately derived system.

  5. Per NEC 220.87, what is the permitted method for determining the existing load on a service for the purpose of adding new loads?

    Answer: Use actual maximum demand data for a 1-year period

    NEC 220.87 permits using actual maximum demand data recorded over a minimum 1-year period to determine the existing load for service upgrade calculations.

  6. In a commercial kitchen, what classification applies to the area within 18 inches of a cooking surface exhaust hood opening per NFPA 96 and NEC 500?

    Answer: Unclassified if proper ventilation is maintained

    Properly ventilated commercial kitchen cooking areas are typically unclassified when NFPA 96 ventilation requirements are met, as the exhaust system removes flammable vapors.

  7. When designing a raceway system for a high-rise building, what is the maximum spacing for conduit supports on a vertical run of rigid metal conduit per NEC Table 344.30(B)(2)?

    Answer: Every 20 feet

    NEC Table 344.30(B)(2) requires RMC supports at intervals not exceeding 20 feet for trade sizes 1 inch and above on straight runs.