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Question # 1
The logical overview of the data center looks as pictured. To what TIA-942 Rating is this design made
based on electrical only?
A. Rating - 4 B. Rating - 3 C. Rating - 2 D. Rating - 1
Answer: A
Explanation:
The electrical design shown in the diagrams represents a TIA-942 Rating-4 configuration. This design
includes full redundancy and fault tolerance, as demonstrated by the dual power distribution paths
from the utility supply to the critical loads. Each power distribution path is equipped with its own
UPS, ensuring that the ICT equipment and mechanical equipment have uninterrupted power in case
of any single point of failure.
Detailed
Explanation:
A Rating-4 data center requires two independent power paths that are fully redundant and capable
of supporting the load independently. In the diagrams:
There are dual feeds from the utility supply, each going through separate transfer switches and
power distribution paths.
Both paths have backup sources (+1) and serve critical components through separate UPS systems,
providing a completely redundant setup.
The design also includes redundant paths to the mechanical equipment and ICT equipment, which
further indicates the fault-tolerant characteristics of a Rating-4 infrastructure.
This setup allows for concurrent maintainability and ensures that no single failure in power
distribution or UPS can impact the data centers operation, which is characteristic of the highest
Tier/Rated-4 classification.
EPI Data Center Specialist References:
EPI guidelines confirm that TIA-942 Rating-4 requires full redundancy and fault tolerance for
electrical infrastructure, ensuring continuous operation even during maintenance o
Question # 2
You are allowed to use a calculator for this question. The total power consumption of the ICT
equipment in a rack is 6 kW. The equipment is traditional ICT equipment with a Delta-T of
approximately 11 °C / 20 °F. Calculate the approximate CFM required to cool the equipment in the
rack.
A. Approximately 1,500 CFM B. Approximately 1,000 CFM C. Approximately 500 CFM D. Approximately 160 CFM
Answer: B
Explanation:
To calculate the cooling airflow requirement for ICT equipment, you can use the formula:
CFM=Power (kW)×3160ΔT(°F)\text{CFM} = \frac{\text{Power (kW)} \times 3160}{\Delta T
(\text{°F})}CFM=ΔT(°F)Power (kW)×3160
For equipment consuming 6 kW with a Delta-T of 20°F:
This formula provides an estimate of the cubic feet per minute (CFM) of air required to cool the
equipment based on its power consumption and the temperature difference (Delta-T) between
intake and exhaust. The Delta-T represents the cooling effectiveness of the airflow.
EPI Data Center Specialist References:
EPI recommends using this calculation for determining airflow requirements in data centers,
ensuring that cooling systems are adequately sized to maintain equipment within safe temperature
limits.
Question # 3
What indicates the breaking capacity of a fuse or breaker?
A. Mechanical strength of the casing of a fuse or breaker. B. The maximum voltage, in case of an electrical surge, that the fuse or breaker can handle withoutbeing destroyed or causing an electric damaging arc. C. The current at which the device will trip. D. The current that a fuse or breaker is able to interrupt without being destroyed or causing anelectric damaging arc.
Answer: D
Explanation:
The breaking capacity of a fuse or breaker indicates the maximum current it can safely interrupt
without being damaged or creating a dangerous arc. This value is crucial for ensuring that the device
can handle fault conditions and prevent equipment damage or fire risks due to excessive current
flow.
Detailed
Explanation:
The breaking capacity, also known as the interrupting rating, ensures that the fuse or breaker can
safely handle fault currents up to a specified limit. Exceeding this capacity could result in the device
failing to interrupt the current, potentially causing hazardous conditions like electrical arcs.
EPI Data Center Specialist References:
EPI training underscores the importance of matching fuses and breakers with appropriate breaking
capacities for the anticipated fault levels in data centers to ensure reliable and safe operation.
Question # 4
The computer room has high levels of H2S gas contamination. What is the best option to resolve this
issue?
A. Vacuum the whole room using a HEPA/S-Class-based filter. B. Install air-scrubbers. C. Clean the room and racks with a damp/wet cloth. D. Provide more air changes per hour by adding more fresh air to the computer room.
Answer: B
Explanation:
High levels of H2S (hydrogen sulfide) gas contamination in a computer room are best addressed by
installing air-scrubbers. Air-scrubbers can effectively filter out contaminants, including corrosive
gases like H2S, ensuring clean air circulation and protecting sensitive IT equipment from potential
corrosion and damage.
Detailed
Explanation:
Air-scrubbers are designed to remove various airborne contaminants and are particularly useful in
environments where corrosive gases are present. These systems use filters or chemical reactions to
neutralize harmful substances, making them ideal for data centers that need to maintain high air
quality for equipment reliability.
EPI Data Center Specialist References
Question # 5
You are allowed to use a calculator for this question. A battery bank is rated at a total capacity of 600
Ah. Calculate how much charging current the rectifier should be able to supply as charging current.
A. 12 Amperes B. 30 Amperes C. 60 Amperes D. 80 Amperes
Answer: B
Explanation:
To determine the charging current for a battery bank, a general rule of thumb is that the charging
current should be 5% of the total battery capacity. For a battery rated at 600 Ah, this calculation
This ensures the battery is charged efficiently without overloading the rectifier or risking battery
damage.
Detailed
Explanation:
Battery charging current is typically set as a percentage of the battery's capacity to balance effective
charging with longevity and safety. A 5% charging rate is standard for lead-acid batteries, which
would be 30 Amperes for a 600 Ah battery bank.
EPI Data Center Specialist References:
EPI standards recommend calculating charging currents based on a percentage of the battery
capacity to ensure safety and efficiency, aligning with best practices for battery management in data
centers.
Question # 6
In order to save energy, you are going to install an automated system to switch off lights. What
should be taken into consideration when installing such a system?
A. Security guards should perform regular inspections verifying the system works. B. The system should not be based on motion detection as the lights might suddenly switch off while
staff is still at work. C. It is not advisable to use such a system since it will reduce the lifetime of LED lighting. D. At all times, the levels should allow for security cameras to function properly.
Answer: D
Explanation:
When installing an automated lighting system, especially in a security-sensitive area like a data
center, its essential to ensure that lighting levels support security camera functionality at all times.
Sufficient lighting is necessary for cameras to capture clear footage, ensuring continuous monitoring
and security regardless of occupancy.
Detailed
Explanation:
Automated lighting based on occupancy or time settings can reduce energy costs, but it must be
configured to maintain adequate illumination for surveillance. Security cameras require minimum
lighting levels to operate effectively, so lighting should be configured to avoid compromising security.
EPI Data Center Specialist References:
EPI emphasizes security and safety in data centers, advising that lighting systems should maintain
levels conducive to effective surveillance, ensuring operational security even when lights are
automatically controlled.
Question # 7
You are allowed to use a calculator for this question.A computer room has a net volume of approximately 2,500 m³ / 88,287 ft³.The temperature is 20 °C / 68 °F.The required design concentration is 7%.The S-Factor is 0.1359 (metric) / 1.885 (imperial).Calculate the amount of gas required for this computer room based on FM200. What is the correctweight?
A. Approximately 410 kg / 900 lbs B. Approximately 820 kg / 1,800 lbs C. Approximately 1,390 kg / 3,000 lbs D. Approximately 1,640 kg / 3,600 lbs
Answer: B
Explanation:
The amount of FM200 gas required can be calculated using the formula:
Weight of Gas=Net Volume×Design Concentration×S-Factor\text{Weight of Gas} = \text{Net Volume}
EPI instructs on using specific formulas and S-factors provided by manufacturers for each gas type,
ensuring that calculations reflect the correct concentration for the given room volume.
Question # 8
What should be considered when installing overhead data cabling?
A. To maintain minimum separation from power and ensure that the fire detection and suppressionsystems are not hindered. B. Copper data cabling should not be placed in metal cable trays. C. Optical fiber cabling should always be positioned on top of the copper cabling in the same cabletray to avoid damage to the sensitive optical fiber. D. All cabling should make sharp bends directly into the rack to avoid usage of additional space andblocking the airflow on top of the rack.
Answer: A
Explanation:
When installing overhead data cabling, its crucial to maintain minimum separation from power
cables to prevent electromagnetic interference. Additionally, cabling should be arranged so that it
does not obstruct fire detection and suppression systems, allowing for proper sensor function and
suppression agent dispersion in the event of a fire.
Detailed
Explanation:
Separation between power and data cabling minimizes the risk of interference and helps ensure
compliance with standards for signal integrity. Proper placement relative to fire suppression systems
ensures that any smoke or heat can be effectively detected, and suppression agents can be evenly
distributed without obstruction from cabling.
EPI Data Center Specialist References:
EPI guidelines emphasize maintaining adequate separation between power and data cables for
safety and performance and ensuring cabling does not interfere with essential safety systems in data
centers.
Question # 9
You are changing the design of the fire suppression system for your computer room from ahalocarbon fire suppression system into an inert-based fire suppression system. Could you use thesame formula to calculate the gas content for the gas?
A. No, there is a significant difference in the formula for the different types of fire suppression gases. B. Yes, as long as you take the difference between the net and gross volume into account. C. Yes, as long as you use the same units of measure, i.e., kg/m³ or lbs/ft³. D. Yes, as long as you change the 'S' factor of the formula to reflect the gas type used.
Answer: A
Explanation:
The formula used to calculate the gas content differs significantly between halocarbon and inertbased
fire suppression systems. Halocarbon systems function by absorbing heat, while inert systems
work by reducing oxygen levels. Due to these differences in fire suppression mechanisms, distinct
formulas are applied, factoring in the specific properties of each gas type and the required
concentration levels.
Detailed
Explanation:
Halocarbon systems like FM200 require a formula that accounts for the concentration needed for
cooling, while inert gases like nitrogen or argon need a formula that calculates the volume based on
oxygen displacement. As the design concentration and characteristics of these gases differ, its
essential to use the correct formula specific to the gas type.
EPI Data Center Specialist References:
EPI recommends consulting the specific design requirements and formulas provided by each gas
manufacturer when switching fire suppression systems to ensure the correct amount of gas is
deployed for effective fire suppression.
Question # 10
What is the main disadvantage of using a ToR (Top of Rack) design?
A. A single ToR (Top of Rack) switch is more expensive than an EoR (End of Row) switch. B. You need a separate rack to install all your ToR (Top of Rack) switches. C. There will be more switches to manage. D. A ToR (Top of Rack) switch has only optical interfaces.
Answer: C
Explanation:
A Top of Rack (ToR) design typically requires more switches because each rack has its own switch to
manage network connections, as opposed to End of Row (EoR) or centralized designs, which
consolidate switches. While ToR designs improve cabling efficiency and reduce latency, they also
increase the number of switches, thus raising management complexity and potentially increasing
capital and operational costs.
Detailed
Explanation:
In a ToR setup, each racks individual switch allows for quick access and streamlined cabling within
the rack. However, this setup means more devices to configure, monitor, and maintain, which can
increase administrative overhead and network management complexity.
EPI Data Center Specialist References:
EPI documentation notes that ToR designs can improve performance but also lead to increased
management needs due to the higher switch count, making them less ideal in environments where
simplified network management is prioritized.
Question # 11
What is the minimum requirement for the power feeds to the building for a Rated-3 data center
based on the ANSI/TIA-942 standard?
A. Two feeds coming from two different substations, one power company is not acceptable B. Two feeds coming from two different substations, one power company is acceptable C. Two feeds entering the data center building from one substation D. One feed from one substation split over two separated distribution boards in separate rooms
Answer: B
Explanation:
The minimum requirement for power feeds to a Rated-3 data center according to ANSI/TIA-942 is to
have two independent power feeds, which can come from two different substations provided by the
same power company. This ensures redundancy and concurrent maintainability, as each feed can
support the load independently during maintenance or failure of the other.
Detailed
Explanation:
The separation by two substations ensures resilience in case of a localized outage or substation
maintenance, aligning with Rated-3 requirements for uninterrupted operation. ANSI/TIA-942 permits
these feeds from a single utility provider as long as they are supplied from distinct substations.
EPI Data Center Specialist References:
EPI underscores the importance of dual power feeds from separate substations for Rated-3 facilities,
highlighting that the ability to draw from different substations aligns with redundancy requirements
for high availability.
Question # 12
A data center requires an audit to find out whether it conforms with ANSI/TIA-942 Rated-3(concurrently maintainable).Will the network architecture be part of this audit?
A. No, as concurrently maintainable only applies to electrical and mechanical (power and cooling). B. Yes, but only if the network administration does not comply with ANSI/TIA-606. C. Yes, amongst other aspects, the network architecture should be Rated-3 compliant with therequirements of ANSI/TIA-942. D. No, only the type of cabling used will be audited.
Answer: C
Explanation:
For a Rated-3 data center, network architecture is indeed a key component of the audit under
ANSI/TIA-942. This rating requires concurrent maintainability across all systems, including
telecommunications infrastructure. The network architecture must therefore meet specific
redundancy and reliability standards to ensure uninterrupted operations during maintenance or
failure of any single component.
Detailed
Explanation:
Rated-3 requirements extend beyond electrical and mechanical systems to include network
architecture. This ensures that telecommunications systems are also designed for concurrent
maintainability, thus contributing to overall uptime and resilience.
EPI Data Center Specialist References:
EPI endorses comprehensive assessments for Rated-3 facilities, emphasizing that network systems
must meet standards for redundancy and concurrent maintainability, which align with ANSI/TIA942s holistic approach to data center reliability.
Question # 13
What is a significant difference between a halocarbon gas-based fire suppression system and an inertgas-based fire suppression system?
A. Inert gas has smaller-sized gas containers than halocarbon gas. B. Inert gas harms the environment and halocarbon gas does not. C. Halocarbon gas works on the basis of heat removal and inert gas works on the basis of oxygenreduction. D. Halocarbon gas works on the basis of oxygen reduction and inert gas works on the basis of heatremoval.
Answer: C
Explanation:
A halocarbon gas-based fire suppression system primarily extinguishes fires through heat absorption.
In contrast, an inert gas-based system works by reducing oxygen levels to a point where combustion
cannot be sustained. Halocarbon agents, like FM-200, absorb heat from the fire, cooling it down,
whereas inert gases, like nitrogen or argon, lower oxygen concentration.
Detailed
Explanation:
Halocarbons are effective in quickly cooling flames and are suitable for electronic environments due
to their fast action. Inert gases displace oxygen to suppress fires, making them ideal in occupied
spaces where human safety can be managed during a fire event due to slower discharge times.
EPI Data Center Specialist References:
EPI training distinguishes between these suppression mechanisms, noting the importance of
selecting the correct system based on specific needs like quick response versus oxygen displacement
for environments with sensitive equipment.
Question # 14
Do you need to consider bullet (ballistics) protection when designing a data center?
A. Bullet (ballistics) protection is required by ANSI/TIA-942 for all data centers. B. Bullet (ballistics) protection is only required when the data center is located in an area with a highcrime rate. C. Bullet (ballistics) protection is required by ANSI/TIA-942 for data centers Rated 3. D. Bullet (ballistics) protection is only required if the facility is a potential target or the building is inthe vicinity of a potential target.
Answer: D
Explanation:
Bullet (ballistics) protection is typically considered only for data centers that are potential targets or
located near such targets. While ANSI/TIA-942 does not specifically require bulletproofing for all data
centers, it is prudent to consider it based on location risk assessments, especially if the facility is in a
high-risk area or near critical infrastructure that could attract threats.
Detailed
Explanation:
Protective measures like bulletproofing depend on the threat landscape and the data centers
exposure to risks such as crime or terrorism. Assessments for physical security are typically
customized based on location-specific risks rather than being universally required by data center
standards.
EPI Data Center Specialist References:
EPI guidelines emphasize customizing physical security measures based on threat assessments,
suggesting that bulletproofing is appropriate in specific circumstances where the facilitys risk profile
justifies additional security measures.
Question # 15
What is a potential disadvantage of using water mist as a fire extinguishing system?
A. It only uses 10% of the water normally used in a water-based fire suppression, which might not beenough to suppress the fire B. It will rapidly increase the humidity level in the data center, which can cause a potential risk forthe operation of the equipment C. It extracts oxygen from the air creating a potential risk for humans inside the computer room D. It has droplets that are too small (100-120 microns) so it can only be used for small fires
Answer: B
Explanation:
A potential disadvantage of using a water mist fire suppression system is that it can rapidly increase
the humidity within the data center, which may pose risks to sensitive electronic equipment.
Excessive humidity can lead to condensation, which could damage electronics and lead to short
circuits or corrosion over time.
Detailed
Explanation:
Water mist systems use fine droplets to suppress fires by cooling and displacing heat. However, the
moisture generated may raise the humidity level to the point where it exceeds safe operational limits
for IT equipment. Therefore, while water mist systems are effective in fire suppression, they may not
be ideal in environments where high humidity could damage sensitive equipment.
EPI Data Center Specialist References:
EPI guidelines advise considering the impact of humidity from fire suppression systems, particularly
in environments housing electronic equipment. Its essential to weigh the benefits of fire
suppression against potential risks to operational equipment when choosing suppression methods.
Question # 16
Which formula is correct?
A. Phase-to-Neutral Voltage = Phase-to-Phase voltage * 1.732 B. Phase-to-Neutral Voltage = Phase-to-Phase voltage .732 C. Phase-to-Neutral Voltage = Phase-to-Neutral voltage * 1.732 D. Phase-to-Neutral Voltage = (Phase-to-Phase voltage * 1.732) / Phase-to-Neutral Voltage
Answer: B
Explanation:
The correct formula for calculating Phase-to-Neutral Voltage in a three-phase power system is PhasetoNeutral Voltage = Phase-to-Phase Voltage / 1.732. This formula applies to balanced three-phase
systems, where 1.732 (or √3) represents the relationship between line-to-line and line-to-neutral
voltages.
Detailed
Explanation:
In three-phase systems, Phase-to-Phase Voltage is higher than Phase-to-Neutral Voltage by a factor
of √3. Dividing the phase-to-phase voltage by 1.732 gives the phase-to-neutral voltage, which is
critical for understanding power distribution in three-phase electrical systems commonly found in
data centers.
EPI Data Center Specialist References:
EPI electrical training highlights the importance of knowing these calculations for designing and
maintaining balanced power systems, which are essential for stable and efficient data center
operations.
Question # 17
The electrical diagram of the data center shows the following UPS configuration and has a load of 80kW.What is the set-up in this data center?
A. 2+N+1 B. 2(N+1) C. N+N(+1) D. (N+1)-(N+1)
Answer: B
Explanation:
A 2(N+1) configuration implies two independent UPS systems, each with N+1 redundancy. This
configuration provides high availability by ensuring that each UPS system can independently support
the load with an additional unit for redundancy. Given the 80 kW load, this setup implies that two
separate N+1 systems are running, providing reliability and fault tolerance for the data centers
power needs.
Detailed
Explanation:
The N+1 notation denotes that each system has one additional unit beyond what is needed to carry
the load, providing redundancy. With 2(N+1), there are two such setups, ensuring that if one fails,
the other can still support the load without interruption, fulfilling high availability requirements.
EPI Data Center Specialist References:
EPI teaches that multiple redundant systems, such as 2(N+1), enhance data center reliability by
ensuring that power is maintained even if a failure occurs in one system. This meets the stringent
demands for uptime in critical environments.
Question # 18
Smoke sensors need to be tested to ensure that they pick up a potential fire in the data center.What should you recommend?
A. Test the sensors by injecting smoke or simulated smoke directly into the sensor B. Press the self-test button on each sensor in the data center C. Inject smoke at the floor level D. Test the sensors according to the vendor specification
Answer: D
Explanation:
Testing smoke sensors should be conducted according to the vendor specifications to ensure
compliance with safety standards and accurate results. Vendors provide specific testing procedures
to account for the sensor type, environment, and operational characteristics, ensuring that tests do
not damage the equipment or provide false results.
Question # 19
The building in which the computer room is housed is required to have a sprinkler system. Thebuilding is therefore equipped with a wet pipe system.What action, if any, should you recommend for the computer room?
A. Maintain the current wet pipe system. B. Replace the wet pipe system with a deluge system. C. Replace the wet pipe system with a dry pipe system. D. Replace the wet pipe system with a pre-action system.
Answer: D
Explanation:
In computer rooms, replacing a wet pipe system with a pre-action system is advisable. Pre-action
systems provide additional protection by requiring two triggers (e.g., heat and smoke) before water
is released, minimizing the risk of accidental discharge and water damage, which is crucial for
safeguarding sensitive IT equipment.
Detailed
Explanation:
Wet pipe systems contain water in the pipes at all times, which poses a higher risk of accidental
discharge. Pre-action systems, however, only fill the pipes with water upon detection of a fire,
reducing the risk of water-related damage due to leaks or malfunctions. This approach is considered
best practice for environments housing sensitive electronic equipment.
EPI Data Center Specialist References:
EPI advises using pre-action fire suppression in data centers to reduce risks associated with
accidental water release, providing a safer and more controlled fire response that better protects
critical infrastructure.
Question # 20
Is it allowed to make design changes during the implementation phase?
A. No, after a design freeze no further changes are allowed. B. Any change is fine as long as it is within the scope of the project. C. Yes, but only when time to implement is not exceeded. D. Only when there is a strong business and/or technical justification.
Answer: D
Explanation:
Design changes during the implementation phase are generally allowed only when there is a strong
business and/or technical justification. Changes at this stage can lead to delays, increased costs, or
compromise design integrity. Thus, a rigorous assessment is required to ensure any modifications are
essential and provide clear benefits or address critical issues.
Detailed
Explanation:
Changes post-design freeze should be minimized to avoid scope creep and additional costs. However,
if a technical issue arises that would affect operational goals, or a business need warrants
modification, justified changes are permissible, following an impact assessment and approval
process.
EPI Data Center Specialist References:
EPI project management guidelines recommend a controlled change management process during
implementation, allowing changes only when they align with critical objectives or address
unforeseen issues that affect the project's success.
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