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Installation & Safety 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 Installation & Safety flashcards as text

  1. What is the correct procedure for locking out a grid-tied PV system before performing maintenance on the inverter?

    Answer: Open the AC disconnect, apply lockout/tagout, then open the DC disconnect and apply lockout/tagout

    Proper LOTO requires isolating both AC and DC sides: open the AC disconnect first, apply lockout/tagout, then open the DC disconnect and apply lockout/tagout.

  2. What does the NEC term 'identified' mean when referring to equipment in Article 690?

    Answer: Listed by a NRTL for its intended use

    'Identified' in the NEC means the equipment is recognized as suitable for the specific purpose, function, or environment, typically by being listed by a Nationally Recognized Testing Laboratory.

  3. What is the purpose of a rapid shutdown system (RSS) in a PV installation per NEC 690.12?

    Answer: To de-energize conductors in or on a building to protect first responders

    Rapid shutdown systems reduce the voltage and current in PV conductors inside and on buildings to protect firefighters and other first responders from electrocution.

  4. Under NEC 690, which conductor color is required for the grounded conductor (negative) in a DC PV circuit?

    Answer: White or gray

    NEC requires white or gray insulation to identify the grounded conductor in DC PV circuits, consistent with general NEC grounded-conductor color coding.

  5. A PV module's Voc is rated at 25°C. How does the open-circuit voltage change when the module temperature drops to -10°C?

    Answer: It increases, and this higher voltage must be considered in system design

    PV module Voc increases as temperature decreases; designers must calculate the maximum Voc at the lowest expected ambient temperature to avoid exceeding equipment ratings.

  6. Which NFPA standard covers electrical safety requirements for employee workplaces and informs PV installation safety practices?

    Answer: NFPA 70E

    NFPA 70E, the Standard for Electrical Safety in the Workplace, establishes arc-flash and shock hazard boundaries and required PPE for workers on energized electrical systems.

  7. What is the minimum burial depth for a PV system DC circuit cable in rigid metal conduit (RMC) per NEC Table 300.5?

    Answer: 6 inches

    NEC Table 300.5 requires a minimum burial depth of only 6 inches for wiring in rigid metal conduit because the conduit itself provides mechanical protection.