In which three locations are smoke detectors commonly placed in the data center? (Choose three.)

Question

Options

• AOn ceilings
• BBelow raised floors
• CIn cable trays
• DAbove drop down ceilings
• EInside the power distribution unit

• A
  77% (47)
• B
  3% (2)
• C
  2% (1)
• D
  7% (4)
• E
  11% (7)

Explanation

Note: The answer key appears incomplete - this "choose three" question's standard correct answers are A, B, and D. Here's the explanation:

Smoke detectors are placed on ceilings (A), below raised floors (B), and above drop-down ceilings (D) because data centers have three distinct air zones where smoke can accumulate and travel before reaching a standard eye-level detector. Raised floors house power and cooling cables where electrical fires often originate, while drop-down (suspended) ceilings trap rising smoke above the visible ceiling tiles - both are hidden spaces requiring dedicated detection. Cable trays (C) are not standard smoke detector locations; they are monitored passively as part of the raised floor or ceiling space rather than housing detectors themselves. Inside a PDU (E) is incorrect because power distribution units are sealed electrical enclosures - detectors go in the airspace around equipment, not inside energized hardware.

Memory tip: Think of a data center as a sandwich - detectors go in the top layer (drop-down ceiling), the middle (main room ceiling), and the bottom layer (raised floor). Anywhere air flows freely is where smoke detectors belong.

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