Practice Test Geeks(NABCEP) North American Board of Certified Energy Practitioners Solar Practice Test
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Commissioning 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 Commissioning flashcards as text

  1. Which NEC article governs the labeling requirements that must be verified during PV system commissioning?

    Answer: Article 690

    NEC Article 690 contains all PV-specific installation and labeling requirements, including mandatory warning labels at disconnects and combiner boxes.

  2. During commissioning, an insulation resistance test on a PV source circuit reads 0.5 MΩ at 500 V. How should the installer interpret this result?

    Answer: Unacceptable — investigate for ground fault or damaged insulation

    Industry practice requires insulation resistance values well above 1 MΩ; 0.5 MΩ suggests damaged insulation or a ground fault that must be corrected.

  3. What is the purpose of recording I-V curve data during PV system commissioning?

    Answer: To establish a performance baseline for future degradation comparison

    I-V curve measurements at commissioning serve as the baseline against which future measurements are compared to detect degradation or faults.

  4. A commissioning technician finds that PV module frames are not bonded to the racking system. Which code section is violated?

    Answer: NEC 690.43 — Equipment Grounding

    NEC 690.43 requires that non-current-carrying metal parts of PV modules and equipment be bonded to the equipment grounding system.

  5. When performing a functional test of a DC arc fault circuit interrupter (AFCI) during commissioning, what is the expected outcome?

    Answer: The AFCI trips and must be manually reset after the test

    A successful AFCI self-test or trip test causes the device to open the circuit and require a manual reset, confirming protective function.

  6. During commissioning of a roof-mounted residential system, the installer cannot locate the required rapid shutdown initiation device. What should happen?

    Answer: Do not commission the system until the RSD device is installed and labeled

    NEC 690.12 requires rapid shutdown systems on all rooftop PV systems; the system must not be commissioned without this required safety equipment in place.

  7. What reading should a clamp-on DC ammeter show on a shaded string during peak sun hours compared to an unshaded string of identical modules?

    Answer: Lower current proportional to the degree of shading

    Shading reduces short-circuit current (Isc) in the affected cells, so the entire shaded string produces less current than an unshaded string.