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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 690.31(C) permits single-conductor cables listed and identified as PV wire for exposed outdoor wiring in the PV array. What additional requirement applies to these conductors?

    Answer: They must be sunlight resistant and listed as PV wire for outdoor use

    NEC 690.31(C) requires single-conductor wiring used in arrays to be listed PV wire rated as sunlight resistant for safe outdoor exposure.

  2. Under NEC 690.8(A), what is the calculated maximum current for a PV source circuit used to size conductors and overcurrent devices?

    Answer: The sum of Isc values multiplied by 125%

    NEC 690.8(A) defines maximum circuit current as the sum of parallel source circuit Isc values, and conductors must be sized at 125% of this value.

  3. NEC 690.9 requires overcurrent protection for PV source and output circuits. When is overcurrent protection NOT required for a PV source circuit conductor?

    Answer: When the ampacity of the conductor is greater than the maximum current it could receive from all parallel sources

    NEC 690.9(A) Exception allows omission of overcurrent protection when the conductor ampacity exceeds the maximum current from all connected parallel sources.

  4. According to NEC 690.53, a permanent label must be applied to the PV system disconnecting means. Which of the following is NOT required on this label?

    Answer: Maximum power point current (Imp) at STC

    NEC 690.53 requires the disconnect label to show system voltage, maximum circuit current, and open-circuit voltage, but does not require Imp to be listed.

  5. For PV systems over 1000 V, NEC 690 refers installers to which additional NEC article for supplementary requirements?

    Answer: Article 691

    NEC Article 691 covers large-scale PV systems operating above 1000 V and provides additional requirements beyond Article 690.

  6. NEC 690.54 requires a label at the utility interactive inverter indicating which of the following?

    Answer: That the inverter output is a 60 Hz source and indicating its rated ac output

    NEC 690.54 requires the inverter to be labeled showing it is a 60 Hz source with its rated ac output to identify it as a power source for first responders.

  7. When NEC 690.31(B) permits PV system wiring to be installed in the same raceway as other systems, what condition must be met?

    Answer: The conductors must be insulated for the maximum voltage of any conductor in the raceway

    NEC 690.31(B) requires that when PV conductors share a raceway with conductors of other systems, all conductors must be insulated for the highest voltage present.