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NEC Article 690 Applications Flashcards

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  1. NEC 690.47(C) addresses DC grounding electrode systems for ungrounded PV systems. What does it require?

    Answer: A separate dc grounding electrode system or bonding to the ac grounding electrode system

    NEC 690.47(C) requires ungrounded PV systems to have either a separate dc grounding electrode or a bond to the existing ac grounding electrode system.

  2. According to NEC 690.41, a PV system arc-fault circuit interrupter (AFCI) is required to protect which conductors?

    Answer: PV source circuits, PV output circuits, and inverter input and output circuits

    NEC 690.41 requires AFCI protection for PV source circuits, output circuits, and inverter input/output to detect and interrupt arc faults in the PV system.

  3. What is the primary purpose of the Ground-Fault Protection (GFP) required by NEC 690.41 for grounded PV arrays?

    Answer: To detect ground faults and disable the array or disconnect faulted circuits

    The GFP device detects ground faults in the array and disables the array or disconnects faulted circuits to prevent fire and equipment damage.

  4. NEC 690.43 requires exposed non-current-carrying metal parts of PV equipment to be grounded or bonded. Which conductor size requirement applies to the equipment grounding conductor?

    Answer: It must be sized per NEC Table 250.122 based on the overcurrent device rating

    NEC 690.43 requires equipment grounding conductors to be sized per NEC Table 250.122, based on the rating of the overcurrent protective device for the circuit.

  5. According to NEC 690.47(A), a grounding electrode conductor for a dc PV system must be sized per which NEC table?

    Answer: Table 250.66

    NEC 690.47(A) references Table 250.66 for sizing the grounding electrode conductor for dc PV systems, same as for ac services.

  6. For an ungrounded PV system, NEC 690.35 requires which of the following protection measures?

    Answer: Ground-fault protection, arc-fault protection, and marking as an ungrounded system

    NEC 690.35 requires ungrounded PV systems to include ground-fault protection, arc-fault protection, and proper labeling indicating the system is ungrounded.

  7. When bonding PV module frames and racking to form a grounding system, NEC 690.43(B) permits listed grounding clips or lugs to bond to which part of the racking?

    Answer: The metal structural framing members of the racking system

    NEC 690.43(B) permits listed grounding clips or lugs to bond module frames and equipment to the metal structural members of the racking system.