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Code Requirements 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 Code Requirements flashcards as text

  1. Under NEC Article 690, what is the maximum voltage permitted for PV source circuits in one- and two-family dwellings?

    Answer: 1000V

    NEC 690.7 limits PV source and output circuit voltages to 1000V for one- and two-family dwellings.

  2. According to NEC 690.12, rapid shutdown of PV systems on buildings requires that PV system conductors outside the array boundary be de-energized to no more than how many volts within 30 seconds of rapid shutdown initiation?

    Answer: 30V

    NEC 690.12 requires conductors outside the array boundary to be reduced to 30V or less within 30 seconds.

  3. Which NEC article specifically governs energy storage systems (ESS) such as battery systems used with solar PV?

    Answer: Article 706

    NEC Article 706 covers energy storage systems, including battery systems paired with solar PV.

  4. When sizing PV source circuit conductors, NEC 690.8 requires the conductor ampacity to be at least what percentage of the sum of the short-circuit currents of all parallel-connected PV modules?

    Answer: 156.25%

    NEC 690.8(A)(1) requires conductors to carry 125% of Isc, and then the overcurrent device and conductor must be sized at 125% of that value, yielding 156.25% of Isc.

  5. Per NEC 690.31, PV wiring systems installed in raceways exposed to direct sunlight on rooftops must use conductors with a temperature rating of at least:

    Answer: 90°C

    NEC 690.31(A) requires conductors in raceways exposed to sunlight on rooftops to be rated at least 90°C.

  6. According to NEC 690.64, a utility-interactive inverter output connection in a residence must be made at a dedicated circuit breaker; if the breaker is at the opposite end of the busbar from the main breaker, what is the key code concern?

    Answer: Busbar back-feed and the 120% rule

    NEC 690.64 and 705.12 require that PV back-fed breakers plus the main breaker rating not exceed 120% of the busbar rating.

  7. Which document provides the installation standard that most jurisdictions adopt by reference, covering PV system installation best practices beyond the NEC's minimum electrical requirements?

    Answer: IFC / NFPA 1 fire codes

    The International Fire Code (IFC) and NFPA 1 set setback and access requirements for PV arrays on rooftops beyond NEC electrical rules.