Practice Test Geeks(NABCEP) North American Board of Certified Energy Practitioners Solar Practice Test
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Grid Interconnection 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.

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  1. During the utility interconnection application process, what typically triggers a 'Supplemental Review' (or detailed study)?

    Answer: The system fails initial fast-track screening due to potential adverse grid impacts

    Supplemental Review is required when a system's initial fast-track screening identifies potential grid impacts — such as thermal overloads or voltage violations — that require detailed engineering analysis.

  2. What is the purpose of a 'Permission to Operate' (PTO) letter issued by the utility?

    Answer: Official utility authorization confirming the system has passed all inspections and may begin exporting power to the grid

    The PTO letter is the utility's final written approval confirming the grid-tied system meets all requirements and may legally begin operating and exporting power.

  3. Which NEC article primarily governs the installation requirements for solar photovoltaic systems in the United States?

    Answer: Article 690 (Solar Photovoltaic Systems)

    NEC Article 690 is dedicated exclusively to Solar Photovoltaic Systems, covering wiring methods, overcurrent protection, disconnecting means, and grounding specific to PV installations.

  4. NEC Article 705 is relevant to grid-tied solar installations because it covers:

    Answer: Interconnected electric power production sources and their connection to premises wiring

    NEC Article 705 addresses interconnected electric power production sources, governing how PV and other generation systems connect to the premises wiring and utility grid.

  5. What power factor range must grid-tied PV inverters typically maintain at the point of interconnection under IEEE 1547?

    Answer: Between 0.85 lagging and 0.85 leading

    IEEE 1547 requires distributed energy resources to maintain power factor between 0.85 lagging and 0.85 leading to manage reactive power exchange with the grid appropriately.

  6. What does the 'interconnection queue' refer to in the utility approval process for solar PV projects?

    Answer: The ordered list of distributed generation projects awaiting utility grid impact studies and interconnection approval

    The interconnection queue is the utility's ordered list of distributed generation applications awaiting grid impact studies, with queue position determining the order in which projects are studied and approved.

  7. A utility may require 'transfer trip' protection on a larger commercial or utility-scale solar installation in order to:

    Answer: Remotely and rapidly disconnect the solar generation system from the grid during utility emergencies or maintenance

    Transfer trip is a protection scheme that enables the utility to remotely command a large DG system to disconnect rapidly during grid emergencies, preventing unintentional islanding on larger systems.