Practice Test Geeks(NABCEP) Certified North American Board of Certified Energy Practitioners Specialist Practice Test
← All NABCEP Flashcard Decks

NEC Article 690 Applications Flashcards

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

Read the first 7 NEC Article 690 Applications flashcards as text

  1. NEC 690.71(A) covers storage batteries used with PV systems. What minimum voltage requirement applies to battery installations in dwelling units?

    Answer: Battery systems must not exceed 50 V dc nominal

    NEC 690.71(A) limits battery systems in dwelling units to 50 V dc nominal or less to reduce shock hazard in residential applications.

  2. Per NEC 690.74, battery interconnect conductors must be sized for at least what percentage of the rated ampacity required for the circuit?

    Answer: 125%

    NEC 690.74 requires battery interconnect conductors to be sized at 125% of the maximum current for which the circuit is rated.

  3. According to NEC 690.72, what device is required to prevent overcharging of batteries in a PV system?

    Answer: A charge controller or other approved current-limiting means

    NEC 690.72 requires a listed charge controller or other approved means to prevent overcharging and potential battery damage or fire.

  4. NEC 690.10 sets maximum voltage limits for PV systems on one- and two-family dwellings. What is the maximum system voltage for these residential installations?

    Answer: 600 V dc

    NEC 690.10 limits PV systems on one- and two-family dwellings to a maximum system voltage of 600 V dc.

  5. When an inverter is used in a PV system, NEC 690.60 requires that inverters listed for interactive operation must be listed and identified for use with which type of system?

    Answer: Interactive (utility-interactive or grid-tied) systems

    NEC 690.60 requires inverters for grid-tied applications to be listed and identified for utility-interactive operation to ensure safety and compatibility.

  6. NEC 690.64 addresses the point of connection for PV systems to a distribution system. What limitation applies to the sum of all power sources connected to a busbar?

    Answer: The combined current ratings must not exceed 120% of the busbar rating

    Per NEC 690.64, the sum of the ampere ratings of all overcurrent devices on a busbar must not exceed 120% of the busbar's ampere rating.

  7. For a stand-alone PV system powering a dwelling, NEC 690.10(C) requires the system to meet which additional code requirement?

    Answer: It must supply the loads in compliance with NEC Article 230 requirements

    NEC 690.10(C) requires stand-alone systems to supply loads at voltages complying with NEC Article 230, maintaining safe voltage levels for premises wiring.