TECHNICAL COMMITTEE 215:

"Electrotechnical Aspects of Telecommunication Equipment"

Project: 79733

Title: prEN 50600‑2‑3 Ed3

Source: Secretariat

Contents Page

European foreword 4

Introduction 5

1 Scope 7

2 Normative references 7

3 Terms, definitions and abbreviations 8

3.1 Terms and definitions 8

3.2 Abbreviations 9

4 Conformance 10

5 Environmental control within data centres 10

5.1 General 10

5.2 Environmental control of data centre spaces 12

6 Availability 16

6.1 General 16

6.2 Availability Class design options 16

6.3 Environmental control system capacity planning with respect to expansion 25

6.4 Environmental control system capacity planning with respect to resilience 25

7 Physical security 25

7.1 General 25

7.2 Protection against unauthorized access 25

7.3 Protection against environmental events (other than fire) within data centre spaces 26

8 Energy and resource efficiency enablement 26

8.1 General 26

8.2 Measurement of temperature 26

8.3 Measurement of relative humidity 27

8.4 Measurement of air pressure 28

8.5 Coolant flow rates and temperatures 28

8.6 Heat removal and heat reuse 28

8.7 Outside air 29

8.8 Water usage 30

Annex A (informative) Overview of the requirements for environmental conditions 31

Annex B (informative) Overview of the requirements for granularity levels 33

Annex C (informative) Liquid cooling 35

C.1 General 35

C.2 Heat removal 35

C.3 Producer circuit 36

C.4 Consumer circuit 36

C.5 Devices for cooling consumption 36

Bibliography 38

Tables

Table 1 — Examples of supply and distribution elements 11

Table 2 — Measurement requirements by Granularity Level 27

Table 3 — Measurement requirements by Granularity Level 27

Table A.1 — Summary of environmental conditions by space type 31

Table B.1 — Summary of requirements for granularity 33

Table C.1 — Recommendations for measurements per granularity level in the re-cooling circuit 35

Table C.2 — Recommendation for measurements per granularity level in the producer circuit 36

Table C.3 — Recommendation for measurements per granularity level in the consumer circuit 36

Table C.4 — Recommendation for measurements per granularity level and cooling consumer 37

Figures

Figure 1 — Schematic relationship between EN 50600 series of documents 6

Figure 2 — Logical representation of environmental control of data centre spaces 10

Figure 3 — Class 1 cooling supply sub-system 18

Figure 4 — Class 1 cooling distribution sub-system 18

Figure 5 — Class 2 cooling supply sub-system 19

Figure 6 — Class 2 cooling distribution sub-system 20

Figure 7 — Class 3 cooling supply sub-system 21

Figure 8 — Class 3 cooling distribution sub-system 22

Figure 9 — Class 4 cooling supply sub-system 23

Figure 10 — Class 4 cooling distribution sub-system 24

Figure 11 — Measuring points for granularity levels 29

Figure 12 — Measuring points for heat reuse 29

Figure 13 — Measuring points for granularity levels 30

European foreword

This document (prEN 50600-2-3:2026) has been prepared by CLC/TC 215 “Electrotechnical aspects of telecommunication equipment”.

This document is currently submitted to the Enquiry.

This document will supersede EN 50600-2-3:2019.

prEN 50600-2-3:2026 includes the following significant technical changes with respect to EN 50600‑2‑3:2019:

a) the whole document has been revised technically and editorially, aligning with EN 50600‑1 and EN 50600‑2‑3;

b) resource enablement aspects included;

c) Clause 3 updated, in particular, terminology for water usage has been added;

d) Clause 5 updated, e.g. requirements for relevant EN 50600‑4-X KPIs added and subclause 5.2 rearranged;

e) Clause 6 revised, amongst others to address direct liquid cooling requirements and to align terminology with EN 50600‑2‑2 (replaced “demarcation point” by “virtual point” and “fault” by “failure”);

f) new 7.3 regarding protection against environmental events (other than fire) within data centre spaces;

g) Clause 8 updated, e.g. requirements for relevant EN 50600‑4-X KPIs added and new subclause 8.8 with requirements for granularity levels of water usage added;

h) Annex A updated;

i) Annex B “Overview of the requirements for granularity levels” and Annex C “Liquid Cooling” added.

Introduction

The unrestricted access to internet-based information demanded by the information society has led to an exponential growth of both internet traffic and the volume of stored/retrieved data. Data centres are housing and supporting the information technology and network telecommunications equipment for data processing, data storage and data transport. They are required both by network operators (delivering those services to customer premises) and by enterprises within those customer premises.

Data centres usually need to provide modular, scalable and flexible facilities and infrastructures to easily accommodate the rapidly changing requirements of the market. In addition, energy consumption of data centres has become critical both from an environmental point of view (reduction of environmental footprint) and with respect to economical considerations (cost of energy) for the data centre operator.

The implementation of data centres varies in terms of:

a) purpose (enterprise, co-location, co-hosting or network operator facilities);

b) security level;

c) physical size;

d) accommodation (mobile, temporary and permanent constructions).

The needs of data centres also vary in terms of availability of service, the provision of security and the objectives for energy efficiency. These needs and objectives influence the design of data centres in terms of building construction, power distribution, environmental control, telecommunications cabling and physical security as well as the operation of the data centre. Effective management and operational information is required to monitor achievement of the defined needs and objectives.

Recognizing the substantial resource consumption, particularly of energy, of larger data centres, it is also important to provide tools for the assessment of that consumption both in terms of overall value and of source mix and to provide Key Performance Indicators (KPIs) to evaluate trends and drive performance improvements.

At the time of publication of this document, the EN 50600 series have been designed as a framework of standards, technical specifications and technical reports covering the design, the operation and management, the key performance indicators for energy efficient operation of the data centre as well as a maturity model for energy management and environmental sustainability.

This series of documents specifies requirements and recommendations to support the various parties involved in the design, planning, procurement, integration, installation, operation and maintenance of facilities and infrastructures within data centres. These parties include:

1) owners, operators, facility managers, ICT managers, project managers, main contractors;

2) consulting engineers, architects, building designers and builders, system and installation designers, auditors, test and commissioning agents;

3) facility and infrastructure integrators, suppliers of equipment;

4) installers, maintainers.

This document is intended for use by and collaboration between all parties involved, however, at least by consulting engineers, architects, building designers and builders, system and installation designers.

The inter-relationship of the documents within the EN 50600 series is shown in Figure 1.

Figure 1 — Schematic relationship between EN 50600 series of documents

EN 50600‑1 introduces the general concepts relevant for the design and operation of data centres.

EN 50600-2-X documents define the requirements for the data centre design and specify requirements and recommendations for particular facilities and infrastructures to support the relevant classification for “availability”, “physical security” and “energy efficiency enablement” selected from EN 50600-1.

EN 50600-3-1 specifies requirements and recommendations for data centre operations, processes and management.

EN 50600-4-X documents specify requirements and recommendations for key performance indicators (KPIs) used to assess and improve the resource usage efficiency and effectiveness, respectively, and criteria of resilience of a data centre.

CLC/TS 50600‑5‑1 specifies the maturity model for energy management and environmental sustainability and refers amongst others to EN 50600‑4-X for KPIs as appropriate.

At the time of publication of this document, the EN 50600-2 series comprises the following documents:

EN 50600-2-1: Information technology — Data centre facilities and infrastructures — Part 2-1: Building construction;

EN 50600-2-2: Information technology — Data centre facilities and infrastructures — Part 2-2: Power supply and distribution;

EN 50600-2-3: Information technology — Data centre facilities and infrastructures — Part 2-3: Environmental control;

EN 50600-2-4: Information technology — Data centre facilities and infrastructures — Part 2-4: Telecommunications cabling infrastructure;

EN 50600-2-5: Information technology — Data centre facilities and infrastructures — Part 2-5: Security systems;

CLC/TS 50600‑2‑10: Information technology — Data centre facilities and infrastructures — Part 2-10: Earthquake risk and impact analysis.

This document, EN 50600‑2‑3, addresses the environmental control facilities and infrastructure within data centres together with the interfaces for monitoring the performance of those facilities and infrastructures in line with EN 50600-3-1 (in accordance with the requirements of EN 50600-1).

This document is intended for use by and collaboration between architects, building designers and builders, system and installation designers.

This series of European Standards does not address the selection of information technology and network telecommunications equipment, software and associated configuration issues.

This document addresses environmental control within data centres based upon the criteria and classifications for “availability”, “security” and “resource and energy efficiency enablement” within EN 50600-1.

This document specifies requirements and recommendations for the following:

a) temperature control;

b) fluid movement control;

c) relative humidity control;

d) particulate control;

e) vibration;

f) granularity level for energy efficiency enablement;

g) physical security of environmental control systems.

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

EN 50600‑1, Information technology - Data centre facilities and infrastructures - Part 1: General concepts

prEN 50600-2-2:2026,^[1] Information technology - Data centre facilities and infrastructures - Part 2-2: Power supply and distribution

EN 50600‑2-5, Information technology - Data centre facilities and infrastructures - Part 2-5: Security systems

EN 50600‑3-1, Information technology - Data centre facilities and infrastructures - Part 3-1: Management and operational information

EN 50600‑4-2, Information technology - Data centre facilities and infrastructures - Part 4-2: Power Usage Effectiveness

EN 50600‑4-6, Information technology - Data centre facilities and infrastructures - Part 4-6: Energy Reuse Factor

EN 50600‑4-7, Information technology - Data centre facilities and infrastructures - Part 4-7: Cooling Efficiency Ratio

EN 50600‑4-9, Information technology - Data centre facilities and infrastructures - Part 4-9: Water Usage Effectiveness

EN 60076‑1, Power transformers - Part 1: General

EN IEC 61439‑1, Low-voltage switchgear and controlgear assemblies - Part 1: General rules

EN IEC 62040‑3, Uninterruptible power systems (UPS) - Part 3: Method of specifying the performance and test requirements

EN ISO 14644‑8, Cleanrooms and associated controlled environments - Part 8: Assessment of air cleanliness by chemical concentration (ACC) (ISO 14644-8:2022)

EN 16798‑3, Energy performance of buildings - Ventilation for buildings - Part 3: For non-residential buildings - Performance requirements for ventilation and room-conditioning systems (Modules M5-1, M5-4)

EN ISO 16890‑1, Air filters for general ventilation - Part 1: Technical specifications, requirements and classification system based upon particulate matter efficiency (ePM) (ISO 16890-1)

EN 378‑3, Refrigerating systems and heat pumps - Safety and environmental requirements - Part 3: Installation site and personal protection

For the purposes of this document, the terms and definitions in EN 50600-1 and the following apply.

ISO and IEC maintain terminology databases for use in standardization at the following addresses:

— IEC Electropedia: available at https://www.electropedia.org/

— ISO Online browsing platform: available at https://www.iso.org/obp

3.1.1

comfort environmental control

control which produces an environment which is appropriate for the effective performance of personnel in a given space

3.1.2

cooling distribution unit

system with one or multiple outlets to connect direct liquid cooled ICT equipment

Note 1 to entry: For Availability Class 3 and Availability Class 4 the cooling distribution unit can contain switch over valves if redundancy is not provided on ICT equipment level.

3.1.3

dew point

temperature at which the water vapour in a gas begins to deposit as a liquid or ice, under standardized conditions

3.1.4

direct fresh air cooling

cooling system that uses the external air that can be filtered to directly cool the ICT equipment in the data centre

Note 1 to entry: Also known as direct free cooling.

3.1.5

diesel rotary UPS

diesel rotary uninterruptible power system

system where the output waveform is produced by a rotating machine that is mechanically connected to a flywheel stored energy source, and the flywheel stored energy source is coupled to a backup engine with an electro-magnetic clutch

3.1.6

inlet air temperature

temperature of the air entering the rack or IT equipment for cooling

3.1.7

thermal load

room or a CFR holding equipment or a technical device or a technical system which needs active cooling

3.1.8

raised access floor

system consisting of completely removable and interchangeable floor panels that are supported on adjustable pedestals connected by stringers to allow the area beneath the floor to be used by building services

3.1.9

relative humidity

ratio, expressed as a percentage, of the vapour pressure of water vapour in moist air to the saturation vapour pressure with respect to water or ice at the same temperature

[SOURCE: IEC 60050-705:1995, 705-05-09]

3.1.10

return air temperature

temperature of the heated air re-entering the environmental control system

3.1.11

rotary uninterruptible power system

rotary UPS

rotating machine, which produces an output waveform, using either batteries or flywheel as stored energy source

3.1.12

static uninterruptible power system

static UPS

the output waveform is produced by electronic circuits, using either batteries or flywheel as stored energy source

3.1.13

supply air temperature

temperature of the air for cooling leaving the environmental control system

Note 1 to entry: An environmental control system is e.g. the CRAC/CRAH.

3.1.14

ventilation

supply of air motion in a space by circulation or by moving air through the space

Note 1 to entry: Ventilation can be produced by any combination of natural or mechanical supply and exhaust.

For the purposes of this document, the abbreviations given in EN 50600-1 and the following apply.

For a data centre to conform to this document:

a) it shall feature an environmental control solution that meets the requirements of Clauses 5 and 6;

b) it shall feature an approach to physical security in relation to the environmental control solution that meets the requirements of Clause 7;

c) it shall feature an energy efficiency enablement solution that meets the requirements of the relevant Granularity Level of Clause 8;

NOTE local regulations, including those regarding safety, can exist.

The required Class of the environmental control system of a data centre is based on the required Availability Class of the data centre.

Power supply and distribution and environmental control are important primary facilities and infrastructures of a data centre and have inter-related design aspects (see Figure 2):

a) power supplied to ICT equipment which is converted to heat output;

b) power supplied to the environmental control system to remove the heat output.

Figure 2 — Logical representation of environmental control of data centre spaces

The environmental control system is one of the most important parts of the data centre infrastructure. Excessive fluctuations in air temperature, water temperatures for liquid-cooled components or relative humidity can directly affect the functionality of the data centre.

The system for controlling the ambient conditions should not be set to rigid values but should be regulated depending on the permissible system temperatures and the relative humidity of the ICT equipment as well as the prevailing conditions outside the data centre in order to achieve an increase in energy efficiency.

The functional elements of the environmental control system are divided into supply and distribution elements. The division of environmental control systems into supply and distribution reflects energy efficiency where data centres use multiple cooling sources in various combinations (e.g. cold water from public grids, non-dedicated central cooling plants, geothermal systems, rivers, and compressor systems).

Supply elements relate to the supply of temperature-controlled fluids. Distribution elements relate to the distribution of fluids supplied by the supply elements. It is divided into devices (systems) and paths. Examples of the supply and distribution elements are listed in Table 1.

Some environmental systems combine the function of supply and distribution elements.

Measurements are requested at various points in this document to provide insight, the ability to analyse and ultimately to improve energy efficiency.

Table 1 — Examples of supply and distribution elements

For further information on liquid cooling systems see Annex C.

The approach taken for the design of the environmental control system shall take into account available technology, sustainability, energy efficiency, physical security, data centre availability, maintenance and future extension (continuity of service).

The design of the environmental control system and the selection and installation of functional elements shall take into consideration the effect of vibration on the data centre spaces and the noise level within the data centre space and outside the building that houses the data centre.

The physical data centre location and external conditions (minimum, median and maximum external temperature and humidity rate) and the effect of climate change on these conditions shall be taken into account for the selection of the functional elements.

The design of the environmental control system and the selection and installation of functional elements shall take into consideration the effect of friction and/or obstruction in the pathways for temperature controlled fluids. Operational controls shall be provided to ensure no degradation of fluid flow due to changes in the pathways according to EN 50600-3-1.

During the design phase the requirement for the number of air changes per unit time and air pressure differences shall be established. EN 16798‑3 can provide support when selecting these values.

In all data centre spaces the requirements for air quality shall be considered.

In all spaces with a risk of damage to static-sensitive equipment from electro-static discharge the relative humidity shall be maintained in accordance with the instructions of the supplier of the equipment to be accommodated. Where no information exists or where the equipment manufacturer is not specified, a minimum dew point of 5,5 °C shall be maintained.

Where direct fresh air cooling solutions are chosen the requirements analysis and the resulting methodology of monitoring and control is of prime importance. In these circumstances particular consideration shall be given to the control of contaminants and relative and absolute humidity.

Spaces with gaseous fire suppression systems require a concept for removing the gas after an activation of the fire suppression system (e.g. mechanical ventilation system). For requirements and recommendation for gaseous fire suppression systems see EN 50600‑2‑5.

An overview of the requirements on environmental conditions is given in Annex A.

The designed PUE, in accordance with EN 50600‑4‑2, and designed CER, in accordance with EN 50600‑4‑7, shall be calculated for different load levels, e.g. 10 %, 25 %, 50 %, 75 % and 100 %. Alternatively, it may be calculated according to the provisioning forecast as described in ISO/IEC TS 8236‑1 and ISO/IEC TS 8236‑2.

For detailed information on the requirements of the maturity level selection see EN 50600‑1.

The use of waste heat e.g. to heat building spaces, generators, or the supply of waste heat for external usage shall be considered.

The use of wider tolerances of temperature and relative humidity in defined data centre spaces (see CLC/TS 50600‑5‑1) should be considered. Deploying groups of ICT equipment with substantially different environmental requirements and / or equipment airflow direction in separate areas should be considered. For additional options to be considered see CLC/TS 50600‑5‑1.

Controlling relative humidity within a wider range can reduce humidification and dehumidification loads and therefore energy consumption.

Devices of the environmental control system with integrated vibration decoupling for all rotating parts (e.g. fan, compressor) or low vibration parts should be selected.

Where devices of the environmental control system or other external devices with rotating parts are not equipped with integrated vibration decoupling the whole unit should be decoupled.

Devices of the environmental control system with low noise levels should be selected.

Where the design of the cooling system relies on the use of “F-gaseous” coolants the long-term availability of such coolants and the subsequent effect on the cooling system efficiency should be considered.

NOTE More information on “F-gaseous” coolants can be found in Regulation (EU) No 2024/573.

No specific requirements.

No specific requirements.

No specific requirements.

Generator and DRUPS spaces

Temperature shall be maintained in accordance with the instructions of the supplier of the equipment to be accommodated. Where no information exists or where the equipment manufacturer is not specified the temperature shall be maintained above 0 °C and should be above 10 °C.

Adequate ventilation shall be provided for combustion and for radiator cooling.

Where the manufacturer is not known at the time of design the maximum temperature shall be 35 °C.

Anti-condensation measures shall be taken for generator and switchgear.

Air intake of cooling equipment or openings for fresh air supply shall not be influenced by exhaust gas.

Using waste heat from the data centre to reduce or eliminate the electrical preheat loads for generators and fuel storage and to maintain temperature in the areas housing generators and fuel storage tanks shall be considered.

Fuel systems

The fuel system shall be protected against sub-zero ambient temperatures to avoid fuel solidification.

NOTE The availability of generators can be adversely affected by cold (<10 °C) or poor quality fuel and can be improved through the installation of crankcase heaters, or by installing the generators in a conditioned, purpose-built space within the data centre facility.

Temperature shall be maintained in accordance with the instructions of the supplier of the equipment to be accommodated unless the system has been de-rated for operation at higher ambient temperatures. Where the manufacturer is not known at the time of design the maximum temperature shall be according to EN 60076-1.

Where necessary, filtration against particulate contamination shall be provided to prevent build-up of dust in accordance with the instructions of the supplier of the equipment to be accommodated. Measures shall be provided to allow inspection and cleaning of the transformer and the transformer space.

Forced air cooling of the transformer should be considered at the design phase where this would represent an improvement in transformer efficiency.

Anti-condensation measures shall be taken for switchgear.

This subclause applies to all rooms holding electrical equipment including distribution equipment. If the space contains a UPS the additional requirements of 5.2.7 shall be applied.

Temperature shall be maintained in accordance with the instructions of the supplier of the equipment to be accommodated. Where no information exists or where the equipment manufacturer is not specified the temperature shall be maintained above 0 °C and should be above 10 °C.

The maximum ambient temperature shall not exceed the maximum temperature specified by the supplier of the equipment to be accommodated unless the system has been de-rated for operation at higher ambient temperatures. Where the manufacturer is not known at the time of design the maximum temperature shall be according to EN IEC 61439‑1 or, when EN IEC 61439‑1 is not applicable, 40 °C.

Anti-condensation measures shall be taken.

Where practicable, natural ventilation shall be provided.

If required, temperature controlled ventilation shall be provided.

Temperature and relative humidity should be monitored.

Static UPS and rotary UPS

Temperature shall be maintained in accordance with the instructions of the supplier of the equipment to be accommodated. If no vendor data exists or where a UPS is not specified EN IEC 62040‑3 shall be applied; where storage batteries are included in the UPS space the requirements of 5.2.7.3 shall be applied.

Air conditioning, rated for the maximum heat output of the UPS system, shall be provided if the external ambient conditions preclude the use of filtered fresh air.

Monitoring for temperature shall be provided.

Waste heat should be used to pre-heat the standby generator plant of the UPS system where possible.

DRUPS

The environmental controls required for the accommodation of diesel rotary UPS are stated in 5.2.4.1.

Batteries

Where batteries are located away from a UPS that they serve, temperature shall be controlled in accordance with the manufacturer’s instructions to maintain planned batterie lifetime. Where no information exists or where the equipment is not specified the temperature shall be maintained at (20 ± 2)°C.

Monitoring for temperature shall be provided.

If required, a resilient fresh air ventilation shall be provided to avoid hydrogen accumulation.

It is recommended that hydrogen monitoring be provided.

See EN IEC 62485‑2 for further information on safety requirements for secondary batteries.

If lithium containing batteries are used It is recommended that carbon monoxide monitoring is provided. If the measured CO concentration exceeds 20 ppm, an acoustic signal should be activated in the storage facility.

Temperature and relative humidity shall be maintained in accordance with the requirements of 5.2.10.

Temperature and relative humidity shall be monitored. Measures addressing gaseous contaminants (see 5.2.10) should be considered.

Where the data centre is supported by a single telecommunications space, or by multiple, non-resilient telecommunications spaces, the space shall have at least a single path environmental control system (for examples see 6.2.2.2 and 6.2.2.3).

The requirements of 5.2.10 shall be applied.

The computer room space is the most important space from an environmental control perspective. The designer of the environmental control system shall assess the impact of a failure of the system on the data centre infrastructure.

The outside air filter class depends on local air quality and shall be selected using EN 16798‑3. The minimum filter class shall be at least filter class ISO ePM10 ≥ 50 % according to EN ISO 16890‑1.

An analysis examining the balance between energy management and environmental control parameters with reference to the type of ICT equipment to be accommodated shall be performed by the owner of the data centre. The results of this analysis shall be compared with the business model for the data centre. CLC/TS 50600-5-1 provides further information to assist with this analysis.

Environmental controls shall be applied that maintain the following parameters within limits defined by the requirements of the analysis described above:

a) supply air temperature;

b) supply air relative humidity;

c) air quality:

1) particulate content;

2) gaseous contaminants.

For the classification of air cleanness by chemical concentration, EN ISO 14644-8 shall be applied.

Gaseous contaminants should be measured periodically or monitored continuously according to ANSI/ISA 71.04-2013. Where no information exists or where the equipment manufacturer is not specified, a minimum class G1 should be maintained. Visual inspection of hardware within the space should be performed as part of the maintenance routines to mitigate the potential risk of damage due to corrosion. Additional information as to the nature and concentration of contaminants can be obtained by laboratory analysis of collected dust from the data centre and/or specimens collected using carbon adhesive tabs.

The supply air temperature shall be monitored with temperature sensors in the supply path near the ICT equipment, the number of sensors shall be chosen to provide a representative average supply air temperature and shall be in accordance with 8.2. In areas of high thermal load additional temperature sensors should be considered to detect hot spots.

Where air containments are used, it is recommended that the supply air temperature is monitored by temperature sensors in the containment. The number of sensors shall be chosen to provide a representative average supply air temperature and shall be in accordance with 8.2.

Where air containments are used, it is recommended that the air flow is monitored by e.g. air flow sensors or static differential pressure sensors, measuring the differential between the computer room and the air containment and the air containment and shall be in accordance with 8.4.

The relative humidity of supply air shall be monitored in the supply path, the number of sensors shall be chosen to provide a representative average value and shall be in accordance with 8.3.

A combined sensor for temperature and relative humidity is allowed. The number of sensors shall be chosen according to the granularity level. Depending on the Availability Class redundant temperature and humidity sensors shall be installed.

It is recommended to install a dew point sensor where relative humidity is measured, or to calculate a dew point from temperature and relative humidity data.

If the mechanical space accommodates electrical equipment then the requirements of 5.2.6 apply otherwise temperature and humidity shall be maintained in accordance with the instructions of the supplier of the equipment to be accommodated.

If the mechanical space is inside a building then the minimum temperature shall be maintained in accordance with the instructions of the supplier of the equipment to be accommodated. Where no information exists or where the equipment manufacturer is not specified the temperature shall be maintained above 0 °C and should be above 10 °C.

The maximum ambient temperature shall not exceed the maximum temperature specified by the supplier of the equipment to be accommodated unless the system has been de-rated for operation at higher ambient temperatures. Where the manufacturer is not known at the time of design the maximum temperature shall be 40 °C.

Anti-condensation measures shall be taken.

A ventilation should be provided.

The requirements of EN 378‑3 shall be applied if a refrigerating system or heat pump is in the mechanical space.

Comfort environmental controls shall be applied to this space.

Comfort environmental controls shall be applied to this space.

Basic environmental controls should be applied (temperature and relative humidity); temperature should be monitored. Measures addressing gaseous contaminants (see 5.2.10) should be considered.

The environmental control system shall be designed to support the Availability Class chosen following the risk assessment undertaken in accordance with the availability classification defined in EN 50600-1.

This document defines four classes of environmental control systems of increasing availability, from class 1 (low availability) up to class 4 (very high availability). For consideration of resilience criteria based on KPI´s for availability, reliability, fault tolerance, etc. refer to CLC/TS 50600‑4‑31.

To maximize the utilization of capital plant, and to minimize energy standing losses, the designer shall take into account the increased redundancy for running at partial load when choosing how to specify the configuration.

In systems with multiple paths it is permissible to utilize different technologies for each path.

For examples of current recommended practices for environmental control see CLC/TS 50600-5-1.

Environmental control systems shall be able to restart automatically after disruption to their power supply. The designer of the system shall consider the effect of power supply disruption and the duration of the restart time following power supply disruption on the environmental conditions within the controlled space. The designer shall also consider delayed operation time in the design of the environmental control system, e.g. sizing of buffer tanks.

Scalable design options are not available for rooms other than described in 6.2.2 and 6.2.3.

Four design options of increasing Availability Class are specified:

a) Class 1: Single path solution

A Class 1 solution is appropriate where the outcome of the risk assessment deems it acceptable that:

— a single failure in a functional element can result in a fault;

— planned maintenance can require the load to be shut down.

b) Class 2: Single path solution with redundancy

A Class 2 solution is appropriate where the outcome of the risk assessment deems it necessary that:

— a single failure in a device shall not result in loss of functional capability of the path due to redundant devices;

— routine planned maintenance of a redundant device shall not require the load to be shut down;

— a fault of the path can result in unplanned load shutdown and routine maintenance of non-redundant devices can require planned load shutdown.

c) Class 3: Multiple paths providing a concurrent repair/operate solution

A Class 3 solution is appropriate where the outcome of the risk assessment deems it necessary that:

— a failure of a functional element shall not result in a fault;

— planned maintenance shall not require the load to be shut down;

— although a fault of a path can result in unplanned load shutdown, maintenance routines shall not require planned load shutdown as the passive path serves to act as the concurrent maintenance enabler as well as reducing the recovery of service time (minimizing the mean downtime) after the fault of a path.

All paths shall be designed to sustain the maximum load.

d) Class 4: fault tolerant solution except during maintenance

A Class 4 solution is appropriate where the outcome of the risk assessment deems it necessary that:

— a failure of a functional element shall not result in a fault;

— planned maintenance shall not require the load to be shut down;

— a fault of one path shall not result in unplanned load shutdown;

— any single event impacting a functional element shall not result in a load shutdown.

All paths shall be designed to sustain the maximum load.

General

The designer of systems which require an additional primary supply (e.g. water) shall consider that the continuity of the primary supply shall meet the requirements of the chosen Availability Class.

Paths for environmental control are serving the input to a CFR or the customer space. In order to support the ICT equipment according to the desired Availability Class the CFR or customer space needs to provide the necessary infrastructure.

When environmental control systems are connected to a UPS the UPS should be separated from the UPS for the ICT equipment.

It should be noted that the examples given in the following subclauses are non-exclusive.

Class 1 - Supply: Single path system

General

Figure 3 shows a Class 1 cooling supply system with a single supply sub-system and a single path to the distribution sub-system. Examples of a Class 1 cooling supply sub-system are:

a) a single compressor-based chiller and a pump;

b) an inlet fan and a cooling coil.

Figure 3 — Class 1 cooling supply sub-system

Power supply

The environmental control system shall be fed from a power supply system that meets the requirements of prEN 50600-2-2:2026 Class 1 or better.

Power Distribution

The designer of the system shall determine the power connection requirements (e.g. unprotected or protected) of control and other functional elements of the environmental control system along with any required management routines such that the design objectives of 6.2.1 are met.

Class 1 - Distribution: Single path system

General

Figure 4 shows a Class 1 cooling system with a single distribution sub-system and a single path from the supply sub-system. An example of a Class 1 cooling distribution sub-system is a single air conditioning module.

Figure 4 — Class 1 cooling distribution sub-system

Power supply

The environmental control system shall be fed from a power supply system that meets the requirements of prEN 50600-2-2:2026 Class 1 or better.

Power distribution

The designer of the system shall determine the power connection requirements (e.g. unprotected or protected) of control and other functional elements of the environmental control system along with any required management routines such that the design objectives of 6.2.1 are met.

Class 2 - Supply: Single path system

General

Figure 5 shows a Class 2 cooling system with redundant supply sub-system and a single path to the distribution sub-system. Examples of a Class 2 supply sub-system are:

a) a redundant compressor-based chiller array and redundant pumps;

b) a redundant array of inlet fans and cooling coils.

Figure 5 — Class 2 cooling supply sub-system

Power supply

The environmental control system shall be fed from a power supply system that meets the requirements of prEN 50600-2-2:2026 Class 2 or better.

Power Distribution

The designer of the system shall determine the power connection requirements (e.g. unprotected, protected or short-break) of control and other functional elements of the environmental control system such that the design objectives of 6.2.1 are met.

Class 2 - Distribution: Single path system

General

Figure 6 shows a Class 2 cooling system with redundant distribution devices and a single path from the supply sub-system. An example of a Class 2 cooling distribution sub-system is a redundant air-conditioning module.

Figure 6 — Class 2 cooling distribution sub-system

Power supply

The environmental control system shall be fed from a power supply system that meets the requirements of prEN 50600‑2‑2:2026 Class 2 or better.

Power Distribution

The designer of the system shall determine the power connection requirements (e.g. unprotected, protected or short-break) of control and other functional elements of the environmental control system such that the design objectives of 6.2.1 are met.

Class 3 - Supply: Multi path resilience and concurrent operate and repair solution

General

Figure 7 shows a Class 3 cooling system with redundant supply sub-system and a redundant path to the distribution sub-system. Examples of a Class 3 supply sub-system are:

a) a redundant compressor-based chiller array and redundant pumps;

b) a redundant array of inlet fans and cooling coils.

Figure 7 — Class 3 cooling supply sub-system

A passive delivery path (with automatic or manual changeover switches) shall be provided. All passive sub-systems (e.g. the chilled water piping) shall also have path redundancy where a failure in such an element can result in a loss of cooling albeit with a rapid (manual) substitution of the active path with the passive path.

Power supply

The environmental control system shall be fed from a power supply system that meets the requirements of prEN 50600-2-2:2026 Class 3 or better.

Power distribution

The designer of the system shall determine the power connection requirements (e.g. unprotected, protected or short-break) of control and other functional elements of the environmental control system such that the design objectives of 6.2.1 are met.

Class 3 - Distribution: Multi path resilience and concurrent operate and repair solution

General

Figure 8 shows a Class 3 cooling system with redundant distribution devices and a redundant path from the supply sub-system. An example of a Class 3 cooling distribution sub-system is a redundant air-conditioning module.

Figure 8 — Class 3 cooling distribution sub-system

A passive delivery path (with automatic or manual changeover switches) shall be provided. All passive sub-systems (e.g. the chilled water piping) shall have path redundancy where a failure in such an element can result in a loss of cooling albeit with a rapid (manual) substitution of the active path with the passive path, e.g. closed circular pipeline including a sufficient number of shut-off valves.

For DLC solutions with CDUs serving more than a single DLC CFR the inlets to the DLC CFRs which contains the DLC ICT equipment are the demarcation points between the data centre infrastructure distribution and the ICT equipment. The CDUs are in this case part of the data centre infrastructure distribution and not part of the ICT equipment.

A risk analysis whether heat exchangers or other measures are necessary to improve resilience shall be carried out.

NOTE 1: Shut-off valves for switch over between active and passive path are part of the data centre infrastructure.

Power supply

The environmental control system shall be fed from a power supply system that meets the requirements of prEN 50600-2-2:2026 Class 3 or better.

Power distribution

The designer of the system shall determine the power connection requirements (e.g. unprotected, protected or short-break) of control and other functional elements of the environmental control system such that the design objectives of 6.2.1 are met.

Class 4 - Supply: Multi path resilience, concurrent operate and repair, and fault tolerant solution

General

Figure 9 shows a Class 4 active/active cooling supply sub-system. It comprises two segregated, compartmentalized and entirely separate supply sub-systems including separated paths. Examples of a Class 4 supply sub-system are:

a) redundant compressor-based chiller arrays and redundant pumps;

b) redundant arrays of inlet fans and cooling coils.

Figure 9 — Class 4 cooling supply sub-system

Power supply

The environmental control system shall be fed from a power supply system that meets the requirements of prEN 50600‑2‑2:2026 Class 2 or better.

Power distribution

The designer of the system shall determine the power connection requirements (e.g. unprotected, protected or short-break) of control and other functional elements of the environmental control system such that the design objectives of 6.2.1 are met.

Class 4 - Distribution: Multi path resilience, concurrent operate and repair, and fault tolerant solution

General

Figure 10 shows a Class 4 active/active cooling distribution sub-system. It comprises two segregated, compartmentalized and entirely separate distribution sub-systems including separated paths. Examples of a Class 4 cooling distribution sub-systems are:

a) redundant air-conditioning modules;

b) redundant air-conditioning modules and adiabatic spray modules with optional powered louvers.

For DLC solutions with CDUs serving more than a single DLC CFR the inlets to the DLC CFRs which contain the DLC ICT equipment are the demarcation points between the data centre infrastructure distribution and the ICT equipment. The CDUs is in this case are part of the data centre infrastructure distribution and not part of the ICT equipment.

In the case of a CDU serving only a single DLC CFR the inlet of this CDU is the demarcation point between the data centre infrastructure distribution and the ICT equipment. The CDU is in this case part of the ICT equipment and not part of the data centre infrastructure distribution.

Routine maintenance of the CDU shall not require the load to be shut down and the DLC CFR shall be connected to an active/active path assuring that there is no hydraulic interconnection of the two paths. A failure inside the CDU shall not affect both paths.

Based on the risk assessment, it shall be considered to build an active/active path inside the DLC CFR in both cases

.

Figure 10 — Class 4 cooling distribution sub-system

Power supply

The environmental control system shall be fed from a power supply system that meets the requirements of prEN 50600‑2‑2:2026 Class 2 or better.

Power distribution

The designer of the system shall determine the power connection requirements (e.g. unprotected, protected or short-break) of control and other functional elements of the environmental control system such that the design objectives of 6.2.1 are met.

General

The requirements of this clause apply where a UPS is not accommodated in the computer room space.

Class 1: Single path - no redundancy

The UPS space shall be cooled by a supply and distribution system class 1 or better that is rated to supply the cooling capacity equal to the maximum possible power losses in the UPS and not exceed the temperature defined in 5.2.7. A single failure in the cooling plant exposes the UPS to over-temperature with the risk of shutdown or bypass and the associated risks for the critical load.

Class 2: Single path - resilience provided by redundancy of devices

The UPS space shall be cooled by a supply and distribution system of class 2 or better that is rated to supply a cooling capacity equal to the maximum possible power losses in the UPS and not exceed the temperature defined in 5.2.7. A single failure in a device does not expose the UPS to over-temperature with the risk of shutdown or bypass and the associated risks for the critical load.

Class 3: Multi path resilience and concurrent operate and repair solution

In case one UPS room is planned, the UPS space shall be cooled by a supply and distribution system of class 3 or better that is rated to supply a cooling capacity equal to the maximum possible power losses in the UPS and not exceed the temperature defined in 5.2.7. A single failure in the cooling system shall not expose the UPS to over-temperature with the risk of shutdown or bypass and the associated risks for the critical load.

In case two separate and redundant UPS rooms are used, the Availability Class 1 or better shall be chosen for the cooling system of each room and the cooling system shall be connected to the same primary power distribution system as the UPS it is supporting.

Class 4: Multi path resilience, concurrent operate and repair, and fault tolerant solution

There is no “Class 4 UPS room”, as in a Class 4 system UPS’s will be in two separate rooms each with a Class 1 environmental control system or better, which are supported by two individual Class 2 electrical power supply systems. For the power distribution the designer of the system shall determine the power connection requirements (e.g. unprotected, protected or short-break) of control and other functional elements of the environmental control systems such that the design objectives of 6.2.1 are met.

During the design phase the use of modular solutions providing capacity for the expected load with respect to time shall be considered.

Where resilience is provided by multiple devices (e.g. CRAC, CRAH, CDU) consideration shall be given to the number of units and the fan speed at which each unit is operated.

The design of the system shall accommodate an operating point where all devices (e.g. CRAC, CRAH, CDU) run at the most energy efficient point of operation.

The control system shall be set up in such a way that it conforms with the separation and redundancy equal to the classes for supply and distribution elements. All devices in the system shall operate on a standalone basis, no central control is required. A central control system can be used for monitoring and manual adjustment. If the central control system fails, the components of the system shall operate in a fail-safe mode so that the operation of the data centre is not disrupted. For classes 3 and 4, this can also be achieved with a redundant control system. For application of quantitative methods to improve aspects of resilience using KPIs, refer to CLC/TS 50600‑4‑31.

For further information for control system see EN ISO 16484‑1, EN ISO 16484‑2, EN ISO 16484‑3 and EN ISO 52120‑1.

Based on the security classification following the risk assessment undertaken in accordance with EN 50600-1, this document provides requirements and recommendations (with optional implementations as required) in relation to the following aspects with the design, planning and installation of the environmental control facilities and infrastructures.

All controls and equipment comprising the environmental control system shall be in areas of Protection Class 3 or above as specified in EN 50600-2-5.

Where pathways are routed in areas of a lower Protection Class they shall be monitored for unauthorized access (see EN 50600-2-5).

Computer room space, UPS space and electrical space shall have sensors to detect leakage from liquid sources in the room if the risk is not mitigated by constructional measures if applicable.

Based on the energy efficiency enablement granularity level defined in accordance with EN 50600-1, this clause provides requirements and recommendations (with optional implementations as required) in relation to the following aspects with the design, planning and installation of the environmental control facilities and infrastructures.

The design of the energy efficiency measurement system shall support the reporting of the following key performance indicators of the EN 50600‑4-x series:

a) ERF as in EN 50600‑4‑6;

b) CER as in EN 50600‑4‑7;

c) WUE as in EN 50600‑4‑9 (if applicable).

An overview of the requirements for granularity levels is given in Annex B.

In all cases external temperature shall be measured and monitored. An external temperature sensor shall be used, located away from any building exhausts and from direct sunlight. For data centres of granularity level 2 and 3 the output from this sensor shall be fed automatically into the control system for the data centre and two sensors should be used.

Computer room temperature shall be monitored. In an air-cooled environment air temperature varies by location. The temperature sensors should be placed in areas of the expected air movement of the CRAC/CRAH and ICT equipment. Where liquid-cooled enclosures or liquid-cooled ICT equipment are used the temperature of the liquid coolant shall be monitored. For further information on liquid cooling systems see Annex C.

The purpose of an air-cooled data centre cooling system is to deliver the correct volume of air within the accepted environmental conditions to the inlet of the ICT equipment. Temperature sensors located as close to the ICT equipment air intakes as possible (e.g. attached to rails / inside rack door) will help to determine how effectively this is achieved. Where sufficient air volume is delivered and the hot and cold air streams are effectively segregated, the measurement of temperature in the cold aisle outside of the rack provides a suitable proxy location. The number of sensors and placement of sensors should give a representative picture of the computer room. It can be desirable to install more than one sensor per rack to understand any deficiencies in cold air delivery (particularly in non-contained systems), for example in front of a live device at one third and two thirds of the rack height.

To understand and optimize the air flow demand from the ICT equipment and load on the cooling units, it is useful to know the delta T across both. The cooling units usually report supply and return temperature. Where they do not, additional sensors should be installed to provide this information. As the return temperature can vary across the return intake of the cooling unit, an average of three readings is recommended.

The ICT equipment outlet temperature will vary according to device type and workload. To measure ICT equipment delta T, additional sensors would be required at the ICT equipment outlet. Similarly to the ICT equipment air inlet sensors, this needs to be as close to the equipment outlet as possible. Any sensors used for this purpose should be paired with an ICT equipment inlet air sensor. An average delta T can then be calculated across the IT devices where the inlet and outlet temperatures are measured.

An alternative to installing permanent sensors is to undertake a periodic survey of temperatures.

Table 2 summarizes the measurement requirements by Granularity Level.

Table 2 — Measurement requirements by Granularity Level

If no air containments are used, the number of sensors should be increased.

In all cases external relative humidity shall be measured and monitored. An external relative humidity sensor should be used, located away from any building exhausts and from direct sunlight. The relative humidity sensor should be co-located with the temperature sensor (see 8.2.1). For data centres of Level 2 and above the reading from the external relative humidity sensor shall be automatic.

For Level 2 and above an additional sensor should be employed to provide resilience. It is recommended to use combined relative humidity and temperature sensors.

Computer room relative humidity shall be measured as shown in Table 3:

Table 3 — Measurement requirements by Granularity Level

For all levels the relative humidity shall be measured in the cold aisle.

For Level 3 are at least 2 sensors per room required.

It is recommended to install a dew point sensor where relative humidity is measured, or to calculate a dew point from temperature and relative humidity data.

Where an raised access floor or a suspended ceiling is installed, the design of the environmental control system shall consider the requirements for the maintenance of static pressure and/or positive air flow under the access floor or in the suspended ceiling. Ensure that there is a slightly positive pressure.

If the cooling concept is based on securing a certain air flow to the ICT equipment through the CRAC/CRAH unit fans for Granularity level 1 it is recommended to measure the static pressure or air flow between the raised access floor, suspended ceiling or containment and the computer room.

For Granularity level 2 and above the following requirements shall be apply:

In all containments with air-cooled ICT equipment the static differential pressure or air flow between the room and the containment shall be measured to ensure a positive air flow.

In computer rooms where not all CFRs are part of a containment the static pressure between the room and the raised access floor or the suspended ceiling shall be measured additional if it is used for the air flow to ensure a static pressure and/or positive air flow.

The associated sensors shall be positioned in locations where reasonable values can be obtained.

Where the design of the environmental control system relies on the movement of fluids, coolant flow meters shall be installed.

It is recommended that coolant mass flow in combination with temperature sensors is measured in order to use the data for heat metering and thus improve the operation of the system.

The location of these sensors shall be determined in accordance with the design requirements of the system.

The design of the environmental control system shall determine the requirement to measure or calculate the heat removed in order to use the data for monitoring and optimization of the cooling units.

Additionally the design shall determine the requirement to quantify total energy use of the cooling system.

The total heat removed from the data centre shall be measured using one of the three granularity levels.

Figure 11 shows the measuring points for the different granularity levels.

For granularity level 1

— the heat removed by the cooling system between the thermal load and the distribution or the supply;

— the energy use in the distribution and in the supply.

For granularity level 2

— the heat removed by groups of the cooling system between the thermal load and the groups of distribution devices or the groups of the supply devices;

— the energy use of groups of distribution elements (e.g. on room-based grouping) and groups of the supply elements (e.g. mechanical cooling groups and free cooling groups).

For granularity level 3

— the heat removed by every device of the distribution and of the supply;

— the energy use of every device of the distribution elements and of the supply elements.

For all granularity levels the thermal energy meters should conform with EN 1434‑1:2022, Class 3 or above and energy meters shall conform with prEN 50600‑2‑2:2026, 8.3.

Figure 11 — Measuring points for granularity levels

The total heat removed from the data centre for heat reuse outside the data centre shall be measured.

Figure 12 shows the measuring points for heat reuse.

For all granularity levels the heat removed by the cooling system is measured between distribution and supply and the heat transferred for reuse outside of the data centre. The energy use of the supply devices and the heat reuse devices is measured.

Figure 12 — Measuring points for heat reuse

Where outside air is drawn into the data centre space for environmental control purposes, sensors for temperature and relative humidity shall be placed at the air inlet.

Note that air quality can also be measured at this point in support of contamination protection (see 5.2.10).

If water is used for cooling purposes in the data centre the following requirements shall be applied:

For granularity level 1

— the heat removed by the cooling system between the thermal load and the distribution or the supply;

— the energy use of the distribution and the supply.

For granularity level 2

— the heat removed by groups of the cooling system between the thermal load and the groups of distribution devices or groups of the supply devices;

— the energy use of groups of distribution elements (e.g. on room-based grouping) and groups of the supply elements (e.g. mechanical cooling groups and free cooling groups).

For granularity level 3

— the heat removed by every device of the distribution and the supply;

— the energy use of every device of the distribution elements and the supply elements.

Figure 13 shows the measuring points for the three different granularity levels.

Figure 13 — Measuring points for granularity levels

1. 
   (informative)
   
   Overview of the requirements for environmental conditions

Table A.1 provides a summary of the requirements for environmental conditions of this document.

Table A.1 — Summary of environmental conditions by space type

1. 
   (informative)
   
   Overview of the requirements for granularity levels

Table B.1 provides a summary of the requirements for granularity levels.

Table B.1 — Summary of requirements for granularity

1. 
   (informative)
   
   Liquid cooling
   1. General

Depending on the cooling generation and transfer system, liquid cooling comprises several system sections. Common system sections include the re-cooling circuit, the generator circuit, the consumer circuit and the devices for cooling consumption. These systems can vary depending on the data centre, which means that individual system sections might not be present.

The purpose of liquid cooling is to provide the correct cooling water volume flow with the cooling water temperatures within its setpoints. To ensure safe and economical operation of the air conditioning system, it is important to know, monitor and continuously optimize the supply and return temperatures in the respective system sections. Each system section should be monitored in order to recognize a deviation or fault in the system as early as possible. Subsequently, the fault can be identified more quickly if the temperature sensor data are recorded.

The flow temperatures in the individual system sections are particularly important for monitoring, as they influence the air conditioning of the IT. The return temperature is influenced by the IT or the upstream system section and provides information about the cooling fluid requirement. If further information is required for system optimization, the control valves can be evaluated, or the system can be equipped with a volume flow measurement.

Insertion sensors with immersion sleeves should primarily be used for the temperature sensors. Contact temperature sensors should only be used temporarily. The sensors should be recorded and analysed by an automation system.

Limit values stored in the automation system should trigger an alarm if they are exceeded or not reached. A system image in the automation system with the measured values displayed is desirable and provides the operator with a quick overview of the actual status of the system.

• 1. Heat removal

This system section is used to transport waste heat from the generator circuit to the environment (e.g. outside air, river water, groundwater). Within the re-cooling circuit, there may be several systems for heat transfer to the environment. Table C.1 shows the measurement recommendations for the individual granularity levels.

Table C.1 — Recommendations for measurements per granularity level in the re-cooling circuit

• 1. Producer circuit

The required cooling water is generated in this system section and transported to the cooling consumers. There may be several cooling systems within the producer circuit. Table C.2 summarizes the measurement recommendations by granularity level.

Table C.2 — Recommendation for measurements per granularity level in the producer circuit

• 1. Consumer circuit

Depending on the system design, the cooling water from the producer circuit is divided into several consumer circuits, each of which supplies its assigned cooling consumers according to demand. Table C.3 summarizes the measurement recommendations by granularity level.

Table C.3 — Recommendation for measurements per granularity level in the consumer circuit

• 1. Devices for cooling consumption

These devices are used to cool IT components. A distinction can be made on the IT components between cooling via the medium air or liquid. With air as the cooling medium, the heat is transferred from the IT return air to the cooling water via a heat exchanger, as is the case with a CRAH, for example.

Various systems are available on the market for cooling IT components using a liquid. For example, there is the use of liquid-flow heat sinks that have direct contact with the IT components. Several heat sinks can be supplied by one supply station. The supply station forms the cooling consumer in terms of the liquid cooling of the data centre.

Another application is immersion cooling, in which the IT components are cooled via non-electrically conductive liquids. Depending on the cooling liquid, it either heats up or changes to the gaseous phase. With this technology, the IT components are used in immersion tanks, so that this immersion tank represents the cooling consumer in terms of the liquid cooling of the data centre. Table C.4 summarizes the measurement recommendations by granularity level.

Table C.4 — Recommendation for measurements per granularity level and cooling consumer

Bibliography

CLC/TS 50600‑4‑31, Information technology - Data centre facilities and infrastructures - Part 4-31: Key performance indicators for Resilience

EN 1434‑1, Thermal energy meters - Part 1: General requirements

EN 1434‑2, Thermal energy meters - Part 2: Constructional requirements

EN 50600‑2‑1, Information technology - Data centre facilities and infrastructures - Part 2-1: Building construction

EN 50600‑2‑4, Information technology — Data centre facilities and infrastructures — Part 2-4: Telecommunications cabling infrastructure

CLC/TS 50600‑5‑1, Information technology - Data centre facilities and infrastructures - Maturity Model for Energy Management and Environmental Sustainability

EN IEC 62485‑2, Safety requirements for secondary batteries and battery installations - Part 2: Stationary batteries

IEC 60050‑705:1995, International Electrotechnical Vocabulary — Part 705: Radio wave propagation

ANSI/ISA 71.04-2013, Environmental Conditions for Process Measurement and Control Systems: Airborne Contaminants

ISO/IEC/TS 8236‑1, Information technology — Provisioning, forecasting and management — Part 1: Data centre IT equipment

ISO/IEC/TS 8236‑2, Information technology — Provisioning, forecasting and management — Part 2: Data centre facility infrastructure

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