Which two factors contribute to the amount of noise an electrical circuit contains within a building infrastructure? (Choose two.)

Question

Options

• AThe temperature ranges within the data center
• BThe integrity of the grounding system throughout the building
• CThe voltage type available to the building at the service entrance
• DThe degree to which electrical loads are balanced throughout the building

• A
  6% (2)
• B
  81% (25)
• C
  10% (3)
• D
  3% (1)

Explanation

Grounding system integrity (B) is a primary contributor to electrical noise because an inadequate or compromised ground provides no reliable path to dissipate stray electrical energy, allowing interference to propagate throughout circuits. Load balance (D) is the second correct answer, as unbalanced loads across electrical phases generate harmonic distortions that introduce noise into the system. Temperature ranges (A) affect component performance over time but are not a direct source of electrical noise in building circuits. Voltage type at the service entrance (C) determines how power is delivered to the building but does not inherently create noise within the internal infrastructure.

Memory tip: Think of noise sources as problems you can control inside the building. Grounding and load balancing are both within the building's control and directly shape the electrical environment, while service entrance voltage type and data center temperature are either external or environmental factors that do not directly inject noise into circuits.

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