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NEC Article 690 Applications Flashcards

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  1. Under NEC 690.13, how many disconnecting means are permitted to serve as the PV system disconnecting means when the system has multiple dc circuits?

    Answer: Up to six disconnects grouped in one location

    NEC 690.13 allows up to six disconnecting means for PV systems, consistent with the six-handle rule used in service disconnects.

  2. NEC Article 690 requires rapid shutdown of PV systems on buildings. What is the maximum voltage PV conductors inside the array boundary must be reduced to within 30 seconds of initiating shutdown?

    Answer: 30 V

    Per NEC 690.12, conductors inside the array boundary must be de-energized to 30 V or less within 30 seconds of rapid shutdown initiation.

  3. For a roof-mounted PV system, what is the boundary of the rapid shutdown zone as defined in NEC 690.12?

    Answer: 3 ft from the array in all directions and 1 ft above the roof

    NEC 690.12 defines the array boundary as within 3 ft of the array in all directions and 1 ft above the roof surface.

  4. According to NEC 690.31(A), PV source and output circuits inside a building must be contained in which of the following?

    Answer: Any listed wiring method suitable for the location

    NEC 690.31(A) requires PV conductors inside buildings to use listed wiring methods appropriate for the environment, not a specific type.

  5. What does NEC 690.13(B) require regarding the location of the PV system disconnecting means?

    Answer: It must be at a readily accessible location

    NEC 690.13(B) requires the PV system disconnecting means to be in a readily accessible location.

  6. NEC 690.56(C) requires a plaque or directory at the service entrance of a building with a PV system. What information must it convey?

    Answer: The location of all disconnecting means including PV system disconnects

    NEC 690.56(C) mandates a plaque at the service entrance indicating the location of all PV system disconnecting means for emergency personnel.

  7. Under NEC 690.15, a disconnecting means must be provided to isolate PV equipment such as inverters and charge controllers. Where must this disconnect be located?

    Answer: Within sight of or integral to the equipment it isolates

    NEC 690.15 requires equipment disconnects to be within sight of or integral to the equipment being isolated, ensuring safe maintenance.

NEC Article 690 Applications Flashcards — NABCEP Study Cards with Answers