Which suppression system is most common in existing data centers?

Question

Options

• AWater sprinkler system
• BHalon total flooding system
• CCarbon dioxide total flooding system
• DWater mist mercury switch sensor system

• A
  72% (23)
• B
  16% (5)
• C
  9% (3)
• D
  3% (1)

Explanation

Water sprinkler systems (A) are by far the most prevalent fire suppression method in existing data centers because they are cost-effective, well-understood, required by most building codes, and have been the standard for decades - the vast majority of legacy and modern facilities rely on them, often with modifications like pre-action systems to reduce accidental discharge risk.

Why the distractors are wrong:

• B (Halon): Halon was widely used in older data centers but was phased out globally under the Montreal Protocol due to ozone depletion; new installations are prohibited, so it cannot be "most common" in existing centers overall.
• C (CO₂ total flooding): Effective but rarely used in occupied data centers because it creates a lethal atmosphere - safety regulations heavily restrict it, making it uncommon.
• D (Water mist mercury switch sensor): This conflates two different things (water mist suppression + a detection component) into a nonsensical option; mercury switches are a sensor/trigger mechanism, not a suppression system category.

Memory tip: Think "most common = most boring and most regulated" - sprinklers win because they're the default that building codes mandate, not because they're the best for electronics. The exotic alternatives (Halon, CO₂) exist but are exceptions, not the rule.

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