Practice Test Geeks(CEI) Certified Electrical Inspector Practice Test
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Renewable Energy System Inspection Flashcards

7 cards from real CEI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Renewable Energy System Inspection flashcards as text

  1. A fuel cell system is being inspected. Which NEC article primarily governs stationary fuel cell power systems?

    Answer: Article 692

    NEC Article 692 specifically covers stationary fuel cell power systems, including their installation, disconnecting means, and interconnection requirements.

  2. What does the term 'maximum power point tracking' (MPPT) refer to in a PV inverter?

    Answer: An algorithm that optimizes the operating point of PV modules for maximum power output

    MPPT is an electronic control algorithm implemented in inverters and charge controllers that continuously adjusts operating voltage and current to extract maximum power from PV modules.

  3. During inspection, an inspector notices PV module frames are bonded together with dedicated bonding conductors. What is the minimum size typically required per NEC 690.43?

    Answer: Sized per the equipment grounding conductor table

    NEC 690.43 requires equipment grounding conductors for PV systems to be sized according to Table 250.122, based on the overcurrent device protecting the circuit.

  4. A hydroelectric micro-generation system produces AC power that is to be interconnected with the utility grid. Which NEC article covers the interconnection requirements?

    Answer: Article 705

    NEC Article 705 covers interconnected electric power production sources, governing how any on-site generation — including micro-hydro — connects to the utility supply system.

  5. What is a 'back-fed breaker' in the context of a grid-tied PV system interconnection, and what special marking is required?

    Answer: A breaker supplied from a PV inverter output that must be marked 'LINE' and 'LOAD' reversed and labeled as a solar supply

    Back-fed breakers carry current in the opposite direction from normal and must be listed for back-fed operation; NEC 705.12 requires the panel to be marked to indicate the presence of a second source.

  6. NEC 705.12(B) sets a limit on the size of a back-fed breaker relative to the panel's busbar rating. What is the '120% rule'?

    Answer: The sum of the main breaker and the back-fed supply breaker cannot exceed 120% of the busbar rating

    The 120% rule states that the sum of the main breaker ampere rating plus the back-fed breaker ampere rating must not exceed 120% of the panel's busbar ampere rating.

  7. When inspecting a PV system on a commercial building, the inspector must verify the system's arc-fault circuit interrupter (AFCI) protection. Where is AFCI protection required per NEC 690.11?

    Answer: On DC circuits of PV systems operating at 80V or greater

    NEC 690.11 requires listed PV arc-fault circuit interrupters on DC circuits of PV systems with a maximum system voltage of 80V or greater to detect and interrupt arc faults.