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Electrical Switchgear Verification Flashcards

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

Read the first 7 Electrical Switchgear Verification flashcards as text

  1. During switchgear commissioning, phase rotation is verified at the incoming terminals. Which instrument is used for this check?

    Answer: Phase sequence indicator or rotation meter

    A phase sequence indicator identifies whether the incoming supply is ABC or ACB rotation to confirm correct motor and protection relay operation.

  2. What is the acceptance criterion for insulation resistance testing of medium-voltage switchgear bus work per NETA ATS guidelines?

    Answer: Minimum 100 MΩ at the appropriate test voltage, with trending against previous results

    NETA ATS recommends 100 MΩ minimum for medium-voltage equipment and emphasizes trending results over time to detect degradation.

  3. A commissioning specification requires verification of the 'cell switch' in a metal-clad switchgear cubicle. What does the cell switch provide?

    Answer: Position-dependent control circuit switching tied to the breaker's racking position

    The cell switch is a cam-operated device that changes control circuit states (enabling or disabling close, trip, or indication circuits) as the breaker moves between positions.

  4. When documenting switchgear commissioning results, which information is essential to record for circuit breaker trip timing tests?

    Answer: Applied test current as a multiple of pickup, measured trip time, and pass/fail comparison to manufacturer's time-current curve

    Trip timing results must reference the applied current multiple and be compared against the manufacturer's TCC to confirm the breaker will protect equipment within its damage curve.

  5. During final commissioning walkdown of a switchgear lineup, what is the purpose of verifying that all arc flash labels are posted on each compartment door?

    Answer: To comply with NFPA 70E requirements for worker hazard communication before energized work

    NFPA 70E requires arc flash hazard labels on all electrical equipment to inform workers of incident energy levels and required PPE before performing energized tasks.

  6. A switchgear bus differential relay (ANSI 87B) is being commissioned. What type of test verifies that the relay correctly trips for an internal bus fault but restrains for an external fault?

    Answer: Differential operate and restraint characteristic test using secondary injection to simulate internal vs. through-fault current

    The differential operate/restraint characteristic test confirms the relay trips when differential current exceeds the restraint threshold (internal fault) and restrains when through-current is present (external fault).

  7. What action must be taken before performing any work inside an energized switchgear compartment during the commissioning process?

    Answer: Conduct an energized electrical work permit and don appropriate arc flash PPE per the incident energy analysis

    NFPA 70E mandates an energized work permit documenting justification, hazard analysis, and required PPE whenever work is performed inside the arc flash boundary.