The building requires sprinklers and is equipped with a wet-pipe system. What action should you recommend for the computer room?
Correct Answer: C
NFPA 75 (IT equipment rooms) recommends pre-action sprinklers for data processing spaces to minimize accidental water discharge risk; wet-pipe is generally discouraged directly over IT hardware.
A sprinkler system employs automatic sprinklers attached to a piping system containing water and connected to a water supply so that water discharges immediately when a head opens. What is this called?
Correct Answer: D
In a wet pipe system, the piping is always filled with water under pressure. When a sprinkler head is triggered by heat, water is discharged immediately. This is the most common sprinkler system for general buildings.
Dry pipe: Pipes contain air or nitrogen; water enters only after valve activation.
Deluge: Pipes are empty, and all heads open simultaneously, releasing water everywhere.
Pre-action: Pipes are dry until detection and valve activation; reduces accidental discharge risk, recommended for IT rooms.
Since the definition describes immediate discharge from water-filled pipes, this is a wet pipe system.
What is the main reason to install Earth Leakage protection?
Correct Answer: B
Earth Leakage Protection is primarily installed to protect human lives by detecting and disconnecting power when a fault current flows to the ground. This type of protection is essential to avoid electrical shock hazards that could occur when insulation fails, or equipment is improperly grounded.
Detailed Explanation:
Earth leakage currents can occur due to insulation faults or accidental contact with live parts. Earth Leakage Protection systems, such as Residual Current Devices (RCDs), quickly detect these faults and disconnect the circuit to prevent harm to personnel. This is especially crucial in environments like data centers where high-powered equipment is continuously running and any electrical fault can pose significant safety risks.
EPI Data Center Specialist Reference:
EPI emphasizes that human safety is paramount in data center operations. Proper grounding and leakage protection are fundamental safety measures, and EPI guidelines align with this focus, underscoring the importance of protecting personnel from electrical hazards through appropriate safety systems.
Question #4
The temperature in the computer room is increased from 18 C (64 F) to 27 C (81 F). What is the impact on the amount of gas required to suppress a fire assuming a halocarbon agent?
Correct Answer: A
Design concentrations for halocarbons (e.g., FM-200/HFC-227ea, Novec 1230) increase with ambient temperature; higher temperature higher minimum extinguishing concentration more agent mass.
What is the redundancy setup shown in the diagram?
Correct Answer: B
The diagram shows three UPS modules, each 100 kW, connected in parallel to support a 100 kW IT load. That means:
One module (100 kW) can support the load (N).
Two additional modules are installed as redundancy.
This equals N+2 redundancy.
2+N+1 and 2(N+1) imply dual active paths not shown.
N+N+N is not an industry term.
Thus, the correct redundancy level is N+2.
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