oSIST prEN 50600-2-3:2026

SLOVENSKI STANDARD
01-marec-2026
Informacijska tehnologija - Naprave in infrastruktura podatkovnega centra - 2-3.
del: Nadzor okolja
Information technology - Data centre facilities and infrastructures - Part 2-3:
Environmental control
Informationstechnik - Einrichtungen und Infrastrukturen von Rechenzentren - Teil 2-3:
Regelung der Umgebungsbedingungen
Technologie de l'information - Installation et infrastructures des centres de traitement de
données - Partie 2-3: Contrôle environnemental
Ta slovenski standard je istoveten z: prEN 50600-2-3:2026
ICS:
35.020 Informacijska tehnika in Information technology (IT) in
tehnologija na splošno general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD DRAFT
prEN 50600-2-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2026
ICS 35.020; 35.110; 35.160 Will supersede EN 50600-2-3:2019
English Version
Information technology - Data centre facilities and infrastructures
- Part 2-3: Environmental control
Technologie de l'information - Installation et infrastructures Informationstechnik - Einrichtungen und Infrastrukturen von
des centres de traitement de données - Partie 2-3: Contrôle Rechenzentren - Teil 2-3: Regelung der
environnemental Umgebungsbedingungen
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2026-04-17.

It has been drawn up by CLC/TC 215.

If this draft becomes a European Standard, CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CENELEC in three official versions (English, French, German).
A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to
the CEN-CENELEC Management Centre has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 79733 Ref. No. prEN 50600-2-3:2026 E

Contents Page
1 European foreword . 4
2 Introduction . 5
3 1 Scope . 7
4 2 Normative references. 7
5 3 Terms, definitions and abbreviations . 8
6 3.1 Terms and definitions . 8
7 3.2 Abbreviations . 9
8 4 Conformance . 10
9 5 Environmental control within data centres . 10
10 5.1 General . 10
11 5.2 Environmental control of data centre spaces . 12
12 6 Availability . 16
13 6.1 General . 16
14 6.2 Availability Class design options . 16
15 6.3 Environmental control system capacity planning with respect to expansion . 25
16 6.4 Environmental control system capacity planning with respect to resilience . 25
17 7 Physical security . 25
18 7.1 General . 25
19 7.2 Protection against unauthorized access . 25
20 7.3 Protection against environmental events (other than fire) within data centre spaces . 26
21 8 Energy and resource efficiency enablement . 26
22 8.1 General . 26
23 8.2 Measurement of temperature . 26
24 8.3 Measurement of relative humidity . 27
25 8.4 Measurement of air pressure . 28
26 8.5 Coolant flow rates and temperatures . 28
27 8.6 Heat removal and heat reuse . 28
28 8.7 Outside air . 29
29 8.8 Water usage . 30
30 Annex A (informative) Overview of the requirements for environmental conditions . 31
31 Annex B (informative) Overview of the requirements for granularity levels . 33
32 Annex C (informative) Liquid cooling . 35
33 C.1 General . 35
34 C.2 Heat removal . 35
35 C.3 Producer circuit . 36
36 C.4 Consumer circuit . 36
37 C.5 Devices for cooling consumption . 36
38 Bibliography . 38
39 Tables
40 Table 1 — Examples of supply and distribution elements . 11
41 Table 2 — Measurement requirements by Granularity Level . 27
42 Table 3 — Measurement requirements by Granularity Level . 27
43 Table A.1 — Summary of environmental conditions by space type . 31
44 Table B.1 — Summary of requirements for granularity . 33
45 Table C.1 — Recommendations for measurements per granularity level in the re-cooling circuit . 35
46 Table C.2 — Recommendation for measurements per granularity level in the producer circuit . 36
47 Table C.3 — Recommendation for measurements per granularity level in the consumer circuit . 36
48 Table C.4 — Recommendation for measurements per granularity level and cooling consumer . 37
49 Figures
50 Figure 1 — Schematic relationship between EN 50600 series of documents . 6
51 Figure 2 — Logical representation of environmental control of data centre spaces . 10
52 Figure 3 — Class 1 cooling supply sub-system . 18
53 Figure 4 — Class 1 cooling distribution sub-system . 18
54 Figure 5 — Class 2 cooling supply sub-system . 19
55 Figure 6 — Class 2 cooling distribution sub-system . 20
56 Figure 7 — Class 3 cooling supply sub-system . 21
57 Figure 8 — Class 3 cooling distribution sub-system . 22
58 Figure 9 — Class 4 cooling supply sub-system . 23
59 Figure 10 — Class 4 cooling distribution sub-system . 24
60 Figure 11 — Measuring points for granularity levels . 29
61 Figure 12 — Measuring points for heat reuse . 29
62 Figure 13 — Measuring points for granularity levels . 30
63 European foreword
64 This document (prEN 50600-2-3:2026) has been prepared by CLC/TC 215 “Electrotechnical aspects of
65 telecommunication equipment”.
66 This document is currently submitted to the Enquiry.
• latest date by which the existence of this (doa) dav + 6 months
document has to be announced at national level
• latest date by which this document has to be (dop) dav + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dav + 36 months
conflicting with this document have to be (to be confirmed or
withdrawn modified when voting)
67 This document will supersede EN 50600-2-3:2019.
68 prEN 50600-2-3:2026 includes the following significant technical changes with respect to EN 50600-2-3:2019:
69 a) the whole document has been revised technically and editorially, aligning with EN 50600-1 and
70 EN 50600-2-3;
71 b) resource enablement aspects included;
72 c) Clause 3 updated, in particular, terminology for water usage has been added;
73 d) Clause 5 updated, e.g. requirements for relevant EN 50600-4-X KPIs added and subclause 5.2
74 rearranged;
75 e) Clause 6 revised, amongst others to address direct liquid cooling requirements and to align terminology
76 with EN 50600-2-2 (replaced “demarcation point” by “virtual point” and “fault” by “failure”);
77 f) new 7.3 regarding protection against environmental events (other than fire) within data centre spaces;
78 g) Clause 8 updated, e.g. requirements for relevant EN 50600-4-X KPIs added and new subclause 8.8 with
79 requirements for granularity levels of water usage added;
80 h) Annex A updated;
81 i) Annex B “Overview of the requirements for granularity levels” and Annex C “Liquid Cooling” added.
82 Introduction
83 The unrestricted access to internet-based information demanded by the information society has led to an
84 exponential growth of both internet traffic and the volume of stored/retrieved data. Data centres are housing
85 and supporting the information technology and network telecommunications equipment for data processing,
86 data storage and data transport. They are required both by network operators (delivering those services to
87 customer premises) and by enterprises within those customer premises.
88 Data centres usually need to provide modular, scalable and flexible facilities and infrastructures to easily
89 accommodate the rapidly changing requirements of the market. In addition, energy consumption of data
90 centres has become critical both from an environmental point of view (reduction of environmental footprint)
91 and with respect to economical considerations (cost of energy) for the data centre operator.
92 The implementation of data centres varies in terms of:
93 a) purpose (enterprise, co-location, co-hosting or network operator facilities);
94 b) security level;
95 c) physical size;
96 d) accommodation (mobile, temporary and permanent constructions).
97 The needs of data centres also vary in terms of availability of service, the provision of security and the
98 objectives for energy efficiency. These needs and objectives influence the design of data centres in terms of
99 building construction, power distribution, environmental control, telecommunications cabling and physical
100 security as well as the operation of the data centre. Effective management and operational information is
101 required to monitor achievement of the defined needs and objectives.
102 Recognizing the substantial resource consumption, particularly of energy, of larger data centres, it is also
103 important to provide tools for the assessment of that consumption both in terms of overall value and of source
104 mix and to provide Key Performance Indicators (KPIs) to evaluate trends and drive performance
105 improvements.
106 At the time of publication of this document, the EN 50600 series have been designed as a framework of
107 standards, technical specifications and technical reports covering the design, the operation and management,
108 the key performance indicators for energy efficient operation of the data centre as well as a maturity model for
109 energy management and environmental sustainability.
110 This series of documents specifies requirements and recommendations to support the various parties involved
111 in the design, planning, procurement, integration, installation, operation and maintenance of facilities and
112 infrastructures within data centres. These parties include:
113 1) owners, operators, facility managers, ICT managers, project managers, main contractors;
114 2) consulting engineers, architects, building designers and builders, system and installation designers,
115 auditors, test and commissioning agents;
116 3) facility and infrastructure integrators, suppliers of equipment;
117 4) installers, maintainers.
118 This document is intended for use by and collaboration between all parties involved, however, at least by
119 consulting engineers, architects, building designers and builders, system and installation designers.
120 The inter-relationship of the documents within the EN 50600 series is shown in Figure 1.
122 Figure 1 — Schematic relationship between EN 50600 series of documents
123 EN 50600-1 introduces the general concepts relevant for the design and operation of data centres.
124 EN 50600-2-X documents define the requirements for the data centre design and specify requirements and
125 recommendations for particular facilities and infrastructures to support the relevant classification for
126 “availability”, “physical security” and “energy efficiency enablement” selected from EN 50600-1.
127 EN 50600-3-1 specifies requirements and recommendations for data centre operations, processes and
128 management.
129 EN 50600-4-X documents specify requirements and recommendations for key performance indicators (KPIs)
130 used to assess and improve the resource usage efficiency and effectiveness, respectively, and criteria of
131 resilience of a data centre.
132 CLC/TS 50600-5-1 specifies the maturity model for energy management and environmental sustainability and
133 refers amongst others to EN 50600-4-X for KPIs as appropriate.
134 At the time of publication of this document, the EN 50600-2 series comprises the following documents:
135 EN 50600-2-1: Information technology — Data centre facilities and infrastructures — Part 2-1: Building
136 construction;
137 EN 50600-2-2: Information technology — Data centre facilities and infrastructures — Part 2-2: Power supply
138 and distribution;
139 EN 50600-2-3: Information technology — Data centre facilities and infrastructures — Part 2-3: Environmental
140 control;
141 EN 50600-2-4: Information technology — Data centre facilities and infrastructures — Part 2-4:
142 Telecommunications cabling infrastructure;
143 EN 50600-2-5: Information technology — Data centre facilities and infrastructures — Part 2-5: Security
144 systems;
145 CLC/TS 50600-2-10: Information technology — Data centre facilities and infrastructures — Part 2-10:
146 Earthquake risk and impact analysis.
147 This document, EN 50600-2-3, addresses the environmental control facilities and infrastructure within data
148 centres together with the interfaces for monitoring the performance of those facilities and infrastructures in line
149 with EN 50600-3-1 (in accordance with the requirements of EN 50600-1).
150 This document is intended for use by and collaboration between architects, building designers and builders,
151 system and installation designers.
152 This series of European Standards does not address the selection of information technology and network
153 telecommunications equipment, software and associated configuration issues.
154 1 Scope
155 This document addresses environmental control within data centres based upon the criteria and classifications
156 for “availability”, “security” and “resource and energy efficiency enablement” within EN 50600-1.
157 This document specifies requirements and recommendations for the following:
158 a) temperature control;
159 b) fluid movement control;
160 c) relative humidity control;
161 d) particulate control;
162 e) vibration;
163 f) granularity level for energy efficiency enablement;
164 g) physical security of environmental control systems.
165 2 Normative references
166 The following documents are referred to in the text in such a way that some or all of their content constitutes
167 requirements of this document. For dated references, only the edition cited applies. For undated references,
168 the latest edition of the referenced document (including any amendments) applies.
169 EN 50600-1, Information technology - Data centre facilities and infrastructures - Part 1: General concepts
170 prEN 50600-2-2:2026, Information technology - Data centre facilities and infrastructures - Part 2-2: Power
171 supply and distribution
172 EN 50600-2-5, Information technology - Data centre facilities and infrastructures - Part 2-5: Security systems
173 EN 50600-3-1, Information technology - Data centre facilities and infrastructures - Part 3-1: Management and
174 operational information
175 EN 50600-4-2, Information technology - Data centre facilities and infrastructures - Part 4-2: Power Usage
176 Effectiveness
177 EN 50600-4-6, Information technology - Data centre facilities and infrastructures - Part 4-6: Energy Reuse
178 Factor
179 EN 50600-4-7, Information technology - Data centre facilities and infrastructures - Part 4-7: Cooling Efficiency
180 Ratio
181 EN 50600-4-9, Information technology - Data centre facilities and infrastructures - Part 4-9: Water Usage
182 Effectiveness
183 EN 60076-1, Power transformers - Part 1: General
184 EN IEC 61439-1, Low-voltage switchgear and controlgear assemblies - Part 1: General rules
———————
Currently at enquiry stage.
185 EN IEC 62040-3, Uninterruptible power systems (UPS) - Part 3: Method of specifying the performance and
186 test requirements
187 EN ISO 14644-8, Cleanrooms and associated controlled environments - Part 8: Assessment of air cleanliness
188 by chemical concentration (ACC) (ISO 14644-8:2022)
189 EN 16798-3, Energy performance of buildings - Ventilation for buildings - Part 3: For non-residential buildings
190 - Performance requirements for ventilation and room-conditioning systems (Modules M5-1, M5-4)
191 EN ISO 16890-1, Air filters for general ventilation - Part 1: Technical specifications, requirements and
192 classification system based upon particulate matter efficiency (ePM) (ISO 16890-1)
193 EN 378-3, Refrigerating systems and heat pumps - Safety and environmental requirements - Part 3: Installation
194 site and personal protection
195 3 Terms, definitions and abbreviations
196 3.1 Terms and definitions
197 For the purposes of this document, the terms and definitions in EN 50600-1 and the following apply.
198 ISO and IEC maintain terminology databases for use in standardization at the following addresses:
199 — IEC Electropedia: available at https://www.electropedia.org/
200 — ISO Online browsing platform: available at https://www.iso.org/obp
201 3.1.1
202 comfort environmental control
203 control which produces an environment which is appropriate for the effective performance of personnel in a
204 given space
205 3.1.2
206 cooling distribution unit
207 system with one or multiple outlets to connect direct liquid cooled ICT equipment
208 Note 1 to entry: For Availability Class 3 and Availability Class 4 the cooling distribution unit can contain switch over valves
209 if redundancy is not provided on ICT equipment level.
210 3.1.3
211 dew point
212 temperature at which the water vapour in a gas begins to deposit as a liquid or ice, under standardized
213 conditions
214 3.1.4
215 direct fresh air cooling
216 cooling system that uses the external air that can be filtered to directly cool the ICT equipment in the data
217 centre
218 Note 1 to entry: Also known as direct free cooling.
219 3.1.5
220 diesel rotary UPS
221 diesel rotary uninterruptible power system
222 system where the output waveform is produced by a rotating machine that is mechanically connected to a
223 flywheel stored energy source, and the flywheel stored energy source is coupled to a backup engine with an
224 electro-magnetic clutch
225 3.1.6
226 inlet air temperature
227 temperature of the air entering the rack or IT equipment for cooling
228 3.1.7
229 thermal load
230 room or a CFR holding equipment or a technical device or a technical system which needs active cooling
231 3.1.8
232 raised access floor
233 system consisting of completely removable and interchangeable floor panels that are supported on adjustable
234 pedestals connected by stringers to allow the area beneath the floor to be used by building services
235 3.1.9
236 relative humidity
237 ratio, expressed as a percentage, of the vapour pressure of water vapour in moist air to the saturation vapour
238 pressure with respect to water or ice at the same temperature
239 [SOURCE: IEC 60050-705:1995, 705-05-09]
240 3.1.10
241 return air temperature
242 temperature of the heated air re-entering the environmental control system
243 3.1.11
244 rotary uninterruptible power system
245 rotary UPS
246 rotating machine, which produces an output waveform, using either batteries or flywheel as stored energy
247 source
248 3.1.12
249 static uninterruptible power system
250 static UPS
251 the output waveform is produced by electronic circuits, using either batteries or flywheel as stored energy
252 source
253 3.1.13
254 supply air temperature
255 temperature of the air for cooling leaving the environmental control system
256 Note 1 to entry: An environmental control system is e.g. the CRAC/CRAH.
257 3.1.14
258 ventilation
259 supply of air motion in a space by circulation or by moving air through the space
260 Note 1 to entry: Ventilation can be produced by any combination of natural or mechanical supply and exhaust.
261 3.2 Abbreviations
262 For the purposes of this document, the abbreviations given in EN 50600-1 and the following apply.
CDU cooling distribution unit
CFR cabinet/frame/rack
DLC direct liquid cooling
DRUPS dynamic rotary uninterruptible power system
263 4 Conformance
264 For a data centre to conform to this document:
265 a) it shall feature an environmental control solution that meets the requirements of Clauses 5 and 6;
266 b) it shall feature an approach to physical security in relation to the environmental control solution that meets
267 the requirements of Clause 7;
268 c) it shall feature an energy efficiency enablement solution that meets the requirements of the relevant
269 Granularity Level of Clause 8;
270 NOTE local regulations, including those regarding safety, can exist.
271 The required Class of the environmental control system of a data centre is based on the required Availability
272 Class of the data centre.
273 5 Environmental control within data centres
274 5.1 General
275 5.1.1 Design input
276 Power supply and distribution and environmental control are important primary facilities and infrastructures of
277 a data centre and have inter-related design aspects (see Figure 2):
278 a) power supplied to ICT equipment which is converted to heat output;
279 b) power supplied to the environmental control system to remove the heat output.
281 Figure 2 — Logical representation of environmental control of data centre spaces
282 5.1.2 Functional elements
283 The environmental control system is one of the most important parts of the data centre infrastructure.
284 Excessive fluctuations in air temperature, water temperatures for liquid-cooled components or relative humidity
285 can directly affect the functionality of the data centre.
286 The system for controlling the ambient conditions should not be set to rigid values but should be regulated
287 depending on the permissible system temperatures and the relative humidity of the ICT equipment as well as
288 the prevailing conditions outside the data centre in order to achieve an increase in energy efficiency.
289 The functional elements of the environmental control system are divided into supply and distribution elements.
290 The division of environmental control systems into supply and distribution reflects energy efficiency where data
291 centres use multiple cooling sources in various combinations (e.g. cold water from public grids, non-dedicated
292 central cooling plants, geothermal systems, rivers, and compressor systems).
293 Supply elements relate to the supply of temperature-controlled fluids. Distribution elements relate to the
294 distribution of fluids supplied by the supply elements. It is divided into devices (systems) and paths. Examples
295 of the supply and distribution elements are listed in Table 1.
296 Some environmental systems combine the function of supply and distribution elements.
297 Measurements are requested at various points in this document to provide insight, the ability to analyse and
298 ultimately to improve energy efficiency.
299 Table 1 — Examples of supply and distribution elements
Area Fluid Functional element
Device / Functional Path / Functional
element element
Supply Water/Refrigerant External water supply, Pipe system
chiller, pump, condensing
unit
Air Outside air intake, filter, Duct/Plenum system
heat exchanger
Distribution Water/Refrigerant Pump, heat exchanger, Pipe system
Air CRAC, CRAH, louvres Duct/Plenum system
300 For further information on liquid cooling systems see Annex C.
301 5.1.3 Requirements
302 The approach taken for the design of the environmental control system shall take into account available
303 technology, sustainability, energy efficiency, physical security, data centre availability, maintenance and future
304 extension (continuity of service).
305 The design of the environmental control system and the selection and installation of functional elements shall
306 take into consideration the effect of vibration on the data centre spaces and the noise level within the data
307 centre space and outside the building that houses the data centre.
308 The physical data centre location and external conditions (minimum, median and maximum external
309 temperature and humidity rate) and the effect of climate change on these conditions shall be taken into account
310 for the selection of the functional elements.
311 The design of the environmental control system and the selection and installation of functional elements shall
312 take into consideration the effect of friction and/or obstruction in the pathways for temperature controlled fluids.
313 Operational controls shall be provided to ensure no degradation of fluid flow due to changes in the pathways
314 according to EN 50600-3-1.
315 During the design phase the requirement for the number of air changes per unit time and air pressure
316 differences shall be established. EN 16798-3 can provide support when selecting these values.
317 In all data centre spaces the requirements for air quality shall be considered.
318 In all spaces with a risk of damage to static-sensitive equipment from electro-static discharge the relative
319 humidity shall be maintained in accordance with the instructions of the supplier of the equipment to be
320 accommodated. Where no information exists or where the equipment manufacturer is not specified, a minimum
321 dew point of 5,5 °C shall be maintained.
322 Where direct fresh air cooling solutions are chosen the requirements analysis and the resulting methodology
323 of monitoring and control is of prime importance. In these circumstances particular consideration shall be given
324 to the control of contaminants and relative and absolute humidity.
325 Spaces with gaseous fire suppression systems require a concept for removing the gas after an activation of
326 the fire suppression system (e.g. mechanical ventilation system). For requirements and recommendation for
327 gaseous fire suppression systems see EN 50600-2-5.
328 An overview of the requirements on environmental conditions is given in Annex A.
329 The designed PUE, in accordance with EN 50600-4-2, and designed CER, in accordance with EN 50600-4-7,
330 shall be calculated for different load levels, e.g. 10 %, 25 %, 50 %, 75 % and 100 %. Alternatively, it may be
331 calculated according to the provisioning forecast as described in ISO/IEC TS 8236-1 and ISO/IEC TS 8236-2.
332 For detailed information on the requirements of the maturity level selection see EN 50600-1.
333 The use of waste heat e.g. to heat building spaces, generators, or the supply of waste heat for external usage
334 shall be considered.
335 5.1.4 Recommendations
336 The use of wider tolerances of temperature and relative humidity in defined data centre spaces (see
337 CLC/TS 50600-5-1) should be considered. Deploying groups of ICT equipment with substantially different
338 environmental requirements and / or equipment airflow direction in separate areas should be considered. For
339 additional options to be considered see CLC/TS 50600-5-1.
340 Controlling relative humidity within a wider range can reduce humidification and dehumidification loads and
341 therefore energy consumption.
342 Devices of the environmental control system with integrated vibration decoupling for all rotating parts (e.g. fan,
343 compressor) or low vibration parts should be selected.
344 Where devices of the environmental control system or other external devices with rotating parts are not
345 equipped with integrated vibration decoupling the whole unit should be decoupled.
346 Devices of the environmental control system with low noise levels should be selected.
347 Where the design of the cooling system relies on the use of “F-gaseous” coolants the long-term availability of
348 such coolants and the subsequent effect on the cooling system efficiency should be considered.
349 NOTE More information on “F-gaseous” coolants can be found in Regulation (EU) No 2024/573.
350 5.2 Environmental control of data centre spaces
351 5.2.1 Building entrance facilities
352 No specific requirements.
353 5.2.2 Personnel entrance
354 No specific requirements.
355 5.2.3 Docking/loading bay
356 No specific requirements.
357 5.2.4 Generator space including fuel storage
358 5.2.4.1 Generator and DRUPS spaces
359 Temperature shall be maintained in accordance with the instructions of the supplier of the equipment to be
360 accommodated. Where no information exists or where the equipment manufacturer is not specified the
361 temperature shall be maintained above 0 °C and should be above 10 °C.
362 Adequate ventilation shall be provided for combustion and for radiator cooling.
363 Where the manufacturer is not known at the time of design the maximum temperature shall be 35 °C.
364 Anti-condensation measures shall be taken for generator and switchgear.
365 Air intake of cooling equipment or openings for fresh air supply shall not be influenced by exhaust gas.
366 Using waste heat from the data centre to reduce or eliminate the electrical preheat loads for generators and
367 fuel storage and to maintain temperature in the areas housing generators and fuel storage tanks shall be
368 considered.
369 5.2.4.2 Fuel systems
370 The fuel system shall be protected against sub-zero ambient temperatures to avoid fuel solidification.
371 NOTE The availability of generators can be adversely affected by cold (<10 °C) or poor quality fuel and can be
372 improved through the installation of crankcase heaters, or by installing the generators in a conditioned, purpose-built space
373 within the data centre facility.
374 5.2.5 Transformer space
375 Temperature shall be maintained in accordance with the instructions of the supplier of the equipment to be
376 accommodated unless the system has been de-rated for operation at higher ambient temperatures. Where the
377 manufacturer is not known at the time of design the maximum temperature shall be according to EN 60076-1.
378 Where necessary, filtration against particulate contamination shall be provided to prevent build-up of dust in
379 accordance with the instructions of the supplier of the equipment to be accommodated. Measures shall be
380 provided to allow inspection and cleaning of the transformer and the transformer space.
381 Forced air cooling of the transformer should be considered at the design phase where this would represent an
382 improvement in transformer efficiency.
383 Anti-condensation measures shall be taken for switchgear.
384 5.2.6 Electrical space
385 This subclause applies to all rooms holding electrical equipment including distribution equipment. If the space
386 contains a UPS the additional requirements of 5.2.7 shall be applied.
387 Temperature shall be maintained in accordance with the instructions of the supplier of the equipment to be
388 accommodated. Where no information exists or where the equipment manufacturer is not specified the
389 temperature shall be maintained above 0 °C and should be above 10 °C.
390 The maximum ambient temperature shall not exceed the maximum temperature specified by the supplier of
391 the equipment to be accommodated unless the system has been de-rated for operation at higher ambient
392 temperatures. Where the manufacturer is not known at the time of design the maximum temperature shall be
393 according to EN IEC 61439-1 or, when EN IEC 61439-1 is not applicable, 40 °C.
394 Anti-condensation measures shall be taken.
395 Where practicable, natural ventilation shall be provided.
396 If required, temperature controlled ventilation shall be provided.
397 Temperature and relative humidity should be monitored.
398 5.2.7 Accommodation of a UPS
399 5.2.7.1 Static UPS and rotary UPS
400 Temperature shall be maintained in accordance with the instructions of the supplier of the equipment to be
401 accommodated. If no vendor data exists or where a UPS is not specified EN IEC 62040-3 shall be applied;
402 where storage batteries are included in the UPS space the requirements of 5.2.7.3 shall be applied.
403 Air conditioning, rated for the maximum heat output of the UPS system, shall be provided if the external
404 ambient conditions preclude the use of filtered fresh air.
405 Monitoring for temperature shall be provided.
406 Waste heat should be used to pre-heat the standby generator plant of the UPS system where possible.
407 5.2.7.2 DRUPS
408 The environmental controls required for the accommodation of diesel rotary UPS are stated in 5.2.4.1.
409 5.2.7.3 Batteries
410 Where batteries are located away from a UPS that they serve, temperature shall be controlled in accordance
411 with the manufacturer’s instructions to maintain planned batterie lifetime. Where no information exists or where
412 the equipment is not specified the temperature shall be maintained at (20 ± 2)°C.
413 Monitoring for temperature shall be provided.
414 If required, a resilient fresh air ventilation shall be provided to avoid hydrogen accumulation.
415 It is recommended that hydrogen monitoring be provided.
416 See EN IEC 62485-2 for further information on safety requirements for secondary batteries.
417 If lithium containing batteries are used It is recommended that carbon monoxide monitoring is provided. If the
418 measured CO concentration exceeds 20 ppm, an acoustic signal should be activated in the storage facility.
419 5.2.8 Telecommunication spaces
420 Temperature and relative humidity shall be maintained in accordance with the requirements of 5.2.10.
421 Temperature and relative humidity shall be monitored. Measures addressing gaseous contaminants (see
422 5.2.10) should be considered.
423 Where the data centre is supported by a single telecommunications space, or by multiple, non-resilient
424 telecommunications spaces, the space shall have at least a single path environmental control system (for
425 examples see 6.2.2.2 and 6.2.2.3).
426 5.2.9 Main distributor spaces
427 The requirements of 5.2.10 shall be applied.
428 5.2.10 Computer room space and associated testing space
429 The computer room space is the most important space from an environmental control perspective. The
430 designer of the environmental control system shall assess the impact of a failure of the system on the data
431 centre infrastructure.
432 The outside air filter class depends on local air quality and shall be selected using EN 16798-3. The minimum
433 filter class shall be at least filter class ISO ePM10 ≥ 50 % according to EN ISO 16890-1.
434 An analysis examining the balance between energy management and environmental control parameters with
435 reference to the type of ICT equipment to be accommodated shall be performed by the owner of the data
436 centre. The results of this analysis shall be compared with the business model for the data centre.
437 CLC/TS 50600-5-1 provides further information to assist with this analysis.
438 Environmental controls shall be applied that maintain the following parameters within limits defined by the
439 requirements of the analysis described above:
440 a) supply air temperature;
441 b) supply air relative humidity;
442 c) air quality:
443 1) particulate content;
444 2) gaseous contaminants.
445 For the classification of air cleanness by chemical concentration, EN ISO 14644-8 shall be applied.
446 Gaseous contaminants should be measured periodically or monitored continuously according to
447 ANSI/ISA 71.04-2013. Where no information exists or where the equipment manufacturer is not specified, a
448 minimum class G1 should be maintained. Visual inspection of hardware within the space should be performed
449 as part of the maintenance routines to mitigate the potential risk of damage due to corrosion. Additional
450 information as to the nature and concentration of contaminants can be obtained by laboratory analysis of
451 collected dust from the data centre and/or specimens collected using carbon adhesive tabs.
452 The supply air temperature shall be monitored with temperature sensors in the supply path near the ICT
453 equipment, the number of sensors shall be chosen to provide a representative average supply air temperature
454 and shall be in accordance with 8.2. In areas of high thermal load additional temperature sensors should be
455 considered to detect hot spots.
456 Where air containments are used, it is recommended that the supply air temperature is monitored by
457 temperature sensors in the containment. The number of sensors shall be chosen to provide a representative
458 average supply air temperature and shall be in accordance with 8.2.
459 Where air containments are used, it is recommended that the air flow is monitored by e.g. air flow sensors or
460 static differential pressure sensors, measuring the differential between the computer room and the air
461 containment and the air containment and shall be in accordance with 8.4.
462 The relative humidity of supply air shall be monitored in the supply path, the number of sen
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