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Difficulty: MediumPhysical Security Controls and Environmental Measures

Following a maintenance check on a central data hall's environmental control system, telemetry logs indicate that the relative humidity (RHRH) inside the facility has dropped to 18%18\%, while the ambient air temperature remains stable at 20∘C20^\circ\text{C} (68∘F68^\circ\text{F}). Which of the following operational risks is most significantly increased by allowing this low humidity level to persist?

  1. Increased probability of electrostatic discharge (ESD) accumulation and damage to active network electronicsAnswer
  2. B
    Rapid formation of moisture condensation on server motherboards causing direct electrical short circuits
  3. C
    Accidental triggering of clean-agent gaseous fire suppression systems due to optical sensor refraction
  4. D
    Thermal throttling of high-density switch backplanes resulting from degraded HVAC cooling capacity

Answer

Increased probability of electrostatic discharge (ESD) accumulation and damage to active network electronics
In server rooms and network infrastructure spaces, standard environmental guidelines recommend maintaining relative humidity between 40%40\% and 55%55\%. When relative humidity drops below 40%40\% (such as the reported 18%18\%), static electrical charges accumulate readily on equipment chassis, cables, and personnel. Any subsequent discharge can destroy delicate microcontrollers and transceiver modules via electrostatic discharge (ESD).

Step-by-Step Solution

1
Analyze the reported environmental conditions
Relative humidity (RH=18%RH = 18\%) is significantly below standard data center thresholds (40%–55%40\%\text{--}55\%), while temperature (20∘C20^\circ\text{C}) is normal.
Identifying environmental deviations helps correlate physical parameters to operational risks.
2
Evaluate physical risks associated with low humidity
Dry air lacks sufficient water vapor to dissipate surface static charges, leading to high static charge buildup on technicians, chassis, and cabling.
Static accumulation released near integrated circuits causes permanent ESD damage.
3
Select the correct physical security/environmental defense control impact
Maintaining relative humidity within 40%–55%40\%\text{--}55\% prevents ESD buildup while avoiding high-humidity condensation risks.
Proper environmental controls balance humidity to prevent both ESD (low RH) and corrosion/shorting (high RH).

Key Concept

Data Center Environmental Controls: Relative Humidity and ESD Mitigation
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Topics

Physical Security Controls and Environmental Measures

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