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Data Center Power Infrastructure Flashcards

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

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  1. What is the primary purpose of a static transfer switch (STS) in a data center power system?

    Answer: To transfer load between two power sources with sub-cycle switching speed

    An STS transfers load between two independent power sources in less than one AC cycle (~4ms) to maintain continuous power to critical loads.

  2. In a 2N power architecture, if one complete power path fails, what percentage of IT load capacity remains available?

    Answer: 100%

    In a 2N architecture, each path is sized to carry 100% of the load, so failure of one entire path leaves the other path fully capable of supporting all IT equipment.

  3. Which harmonic order is typically the dominant harmonic produced by six-pulse rectifiers commonly used in UPS systems?

    Answer: 5th harmonic (300 Hz)

    Six-pulse rectifiers predominantly generate 5th harmonic (300 Hz at 60 Hz systems) as the lowest-order characteristic harmonic, which is the most problematic for power quality.

  4. A data center operator installs a 1500 kVA transformer with a 0.85 power factor rating. What is the maximum real power (kW) the transformer can deliver?

    Answer: 1,275 kW

    Real power (kW) = kVA × power factor = 1500 × 0.85 = 1,275 kW.

  5. What does the term 'power stranding' refer to in data center power planning?

    Answer: Unusable power capacity due to imbalanced phase loading or circuit limits

    Power stranding occurs when available electrical capacity cannot be used because of imbalanced phases, circuit breaker limits, or cooling constraints, leaving capacity installed but inaccessible.

  6. Which standard defines the test procedures and performance requirements for UPS systems used in data centers?

    Answer: IEC 62040-3

    IEC 62040-3 specifies the method of specifying the performance and test requirements for UPS systems, defining classifications like VFI, VI, and VFD.

  7. In data center power distribution, what is the recommended maximum loading percentage for a branch circuit to avoid nuisance tripping under continuous loads?

    Answer: 80%

    The NEC requires continuous loads (lasting 3 hours or more) to not exceed 80% of branch circuit breaker rating to prevent thermal tripping.