Fire-rated glass must be installed within manufacturer’s tested maximum exposed area. Oversized

panes risk failure under fire conditions. If the window exceeds 2 m², the correct approach is to

subdivide it into smaller sections, each ≤2 m², using approved fire-rated frames.

Options B and C (silicone or aluminum splits) are not certified fire-rated framing methods. Option A

is unsafe because normal glass provides no fire protection.

Therefore, option D ensures compliance and safety.

Reference: EN 1363-1 (Fire Resistance Tests), NFPA 80 (Fire Doors & Windows).

The wet bulb and dry bulb temperatures become identical when the relative humidity reaches 100%.

At this point, the air is fully saturated with moisture, meaning it can no longer absorb additional

water vapor. As a result, the rate of evaporation decreases, and there is no difference between the

dry bulb and wet bulb temperatures.

Detailed Explanation:

The dry bulb temperature measures the air temperature, while the wet bulb temperature takes into

account the cooling effect of evaporation. When relative humidity is at 100%, the air has reached its

saturation point, and no further evaporation occurs. This causes both the wet bulb and dry bulb

thermometers to display the same temperature reading. This condition is critical in understanding

environmental conditions, particularly in HVAC and data center environments, where humidity

control is essential to avoid equipment overheating or corrosion.

EPI Data Center Specialist Reference:

The EPI Data Center Specialist training includes understanding humidity levels and their impact on

data center environments. Knowing when wet bulb and dry bulb temperatures align helps data

center operators manage moisture levels effectively, which is essential for preventing issues related

to high humidity, such as condensation on IT equipment.

Aerosol sprays release particulates and residues into the environment, which can contaminate

sensitive ICT equipment. Such contamination accelerates corrosion, interferes with airflow, and

increases particulate levels beyond ASHRAE recommended limits.

Proper cleaning should use HEPA-filtered vacuum systems or dry wipes, not aerosols. Even odor

control aerosols are disallowed in critical rooms.

Therefore, aerosol cleaning solutions must never be used.

Reference: ASHRAE TC 9.9 “Contamination Guidelines,” NFPA 75 §8.4.

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Commissioning occurs during the Implementation stage of the data center life cycle. This phase

involves the final testing and verification of systems and equipment to ensure they meet design

specifications and operational requirements before the data center goes live.

Detailed Explanation:

The Implement phase includes activities such as installation, configuration, and testing.

Commissioning is a crucial step that validates the performance and reliability of all critical systems,

including power, cooling, and network infrastructure, to ensure they operate as intended under

various conditions. Proper commissioning helps identify and resolve any issues before the data

center becomes fully operational.

EPI Data Center Specialist Reference:

EPI training emphasizes that commissioning is essential for verifying that the data center meets

design and performance criteria, aligning with best practices in data center project management to

minimize risks and ensure readiness for operation.

In locations with consistently cold temperatures, such as above the Arctic Circle, an airside

economizer is the most energy-efficient cooling solution. Airside economizers use cool outside air to

lower indoor temperatures, reducing or even eliminating the need for mechanical cooling. Given the

consistently low temperatures, this method maximizes energy efficiency by leveraging natural

cooling.

Detailed Explanation:

Airside economizers are ideal in environments where outside temperatures are consistently low. By

drawing in and filtering cold outdoor air, they directly cool the indoor environment, thereby reducing

energy consumption significantly compared to traditional air conditioning. This cooling approach

aligns with energy efficiency goals by minimizing mechanical cooling demands.

EPI Data Center Specialist Reference:

EPI recommends the use of airside economizers in cold climates to achieve high energy efficiency, as

they allow data centers to capitalize on ambient conditions for cooling, aligning with sustainability

and cost-saving practices.

With infrequent/short outages, Standby (Emergency Standby Power, ESP) generators are

appropriate; N+1 mitigates failure-to-start risk and supports concurrently maintainable designs.

Reference: ISO 8528-1 (generator rating definitions: ESP/PRP/Continuous), ANSI/TIA-942-B §6.2

(electrical redundancy).

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ANSI/TIA-942 requires a risk assessment–based approach to physical security; ballistic protection is

not mandated but may be justified by threat analysis.

A is incomplete (it may still be required by risk).

D is false.

Reference: ANSI/TIA-942-B §6.4 Physical Security (threat/risk assessment), ISO 31000 (risk

management).

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When installing a raised floor, the best starting point is typically from the farthest corner away from

the entrance, in this case, Point B. This method allows for the floor installation to progress towards

the entrance, ensuring that workers can avoid walking over the newly installed tiles, thus minimizing

the risk of damage and maintaining cleanliness during installation.

Detailed Explanation:

Starting at the farthest corner (Point B) and working towards the entrance (Point A) is a standard

practice in raised floor installation. This approach ensures that installers do not walk over freshly laid

tiles, which could lead to shifting or misalignment. Additionally, it allows for more controlled

placement and alignment, as well as convenient egress when installation is complete.

EPI Data Center Specialist Reference:

EPI guidelines for raised floor installation emphasize beginning at the farthest point from the

entrance and working back towards it, which aligns with industry best practices for efficiency and

quality assurance. This method reduces potential damage and supports precise alignment across the

floor area.

For a UPS system in a Rating-4 data center, the synchronization of output can indeed depend on the

specific settings of the UPS. Generally, such systems allow for flexible configuration where the output

can be synchronized to either power feed A or B, depending on which feed is preferred for stability or

redundancy purposes.

Detailed Explanation:

In dual-feed setups, such as those in high-redundancy data centers, the UPS can be set to

synchronize with either feed. This ensures that the UPS maintains continuity in case one feed

becomes unstable or fails. The flexibility to choose synchronization to either feed enhances the

resiliency and reliability of power supply, which is critical in Tier IV (Rating-4) facilities where uptime

is paramount.

EPI Data Center Specialist Reference:

The EPI Data Center Specialist course underscores the importance of configurable UPS systems in

Rating-4 data centers, where redundancy and continuous power are critical. By allowing

synchronization to either feed, the UPS can maintain the highest level of reliability, which aligns with

the rigorous standards expected in such environments.

Data centers typically have high airflow environments due to CRAC/CRAH units, containment, and

raised floors. Standard smoke detectors (ionization or photoelectric) often fail to detect incipient

smoke because the air movement disperses particles.

The correct solution is VESDA/VIEW (Very Early Warning) smoke detection systems, which use

aspirating smoke detectors (ASD). These systems continuously sample air through pipes and can

detect smoke particles at concentrations as low as 0.001% obscuration/m. This provides early

detection well before fire growth, allowing mitigation without system shutdown.

Dry pipe sprinklers (A) are suppression, not detection.

Ionization detectors (B) are sensitive to flaming fires but unreliable in high-airflow environments.

Photoelectric detectors (C) are better for smoldering fires but still inadequate in high airflow

compared to ASD systems.

Reference: NFPA 75 §5.4.3, NFPA 76 (Telecom facilities – aspirating systems), ISO 7240-20 (Aspirating

Smoke Detectors).