oSIST prEN 50600-2-2:2026

SLOVENSKI STANDARD
01-marec-2026
Informacijska tehnologija - Naprave in infrastruktura podatkovnega centra - 2-2.
del: Napajanje in distribucija električne energije
Information technology - Data centre facilities and infrastructures - Part 2-2: Power
supply and distribution
Informationstechnik - Einrichtungen und Infrastrukturen von Rechenzentren - Teil 2-2:
Stromversorgung
Technologie de l'information - Installation et infrastructures de centres de traitement de
données - Partie 2-2: Alimentation en énergie et distribution de l’énergie
Ta slovenski standard je istoveten z: prEN 50600-2-2:2026
ICS:
29.240.01 Omrežja za prenos in Power transmission and
distribucijo električne energije distribution networks in
na splošno general
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 50600-2-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2026
ICS 35.020; 35.110; 91.140.50 Will supersede EN 50600-2-2:2019
English Version
Information technology - Data centre facilities and infrastructures
- Part 2-2: Power supply and distribution
Technologie de l'information - Installation et infrastructures Informationstechnik - Einrichtungen und Infrastrukturen von
de centres de traitement de données Rechenzentren - Teil 2-2: Stromversorgung
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: 79732 Ref. No. prEN 50600-2-2:2026 E

Contents Page
1 European foreword . 5
2 Introduction . 6
3 1 Scope . 8
4 2 Normative references . 8
5 3 Terms, definitions and abbreviations . 9
6 3.1 Terms and definitions . 9
7 3.2 Abbreviations . 13
8 3.3 Symbols . 14
9 4 Conformance . 14
10 5 Power supply and distribution within data centres . 14
11 5.1 Functional elements . 14
12 5.1.1 General . 14
13 5.1.2 Power supply to the data centre. 15
14 5.1.3 Power distribution within the data centre . 16
15 5.2 Dimensioning of power distribution systems . 18
16 6 Availability . 18
17 6.1 General . 18
18 6.2 Power supply . 19
19 6.2.1 Capacity planning . 19
20 6.2.2 Availability of the utility supply . 21
21 6.2.3 Power quality . 22
22 6.2.4 Load presented to the utility supply . 22
23 6.2.5 Equipment. 23
24 6.2.6 Availability Class design options . 25
25 6.3 Power distribution . 31
26 6.3.1 Capacity planning . 31
27 6.3.2 Power quality . 33
28 6.3.3 Equipment. 33
29 6.3.4 Availability Class design options . 34
30 6.4 Incorporation of low voltage direct current distribution . 38
31 6.5 Additional considerations . 38
32 6.5.1 Residual current measurement . 38
33 6.5.2 Type of system earthing in low-voltage installations . 39
34 6.5.3 Lightning and surge protection . 39
35 6.5.4 Segregation of power distribution cabling and information technology cabling 39
36 6.6 Emergency power off . 39
37 6.6.1 Requirements . 39
38 6.6.2 Recommendations . 39
39 6.7 Control system capacity planning with respect to resilience . 39
40 7 Physical security . 40
41 7.1 General . 40
42 7.2 Protection against unauthorized access . 40
43 7.2.1 Power supply . 40
44 7.2.2 Power distribution . 40
45 7.2.3 Attachment of unauthorized end-equipment . 40
46 7.3 Internal environmental events . 40
47 7.3.1 Power supply . 40
48 7.3.2 Power distribution . 40
49 7.4 External environmental events . 41
50 8 Energy efficiency enablement and power distribution . 41
51 8.1 General . 41
52 8.2 Quality of measurements . 42
53 8.2.1 Requirements . 42
54 8.2.2 Recommendations . 43
55 8.3 Granularity Level 1 . 43
56 8.4 Granularity Level 2 . 43
57 8.5 Granularity Level 3 . 43
58 8.6 Cabling infrastructure to support energy efficiency enablement. 43
59 Bibliography . 44
60 Tables
61 Table 1 — Typical functional elements of power supply and distribution . 15
62 Figures
63 Figure 1 — Schematic relationship between EN 50600 series of documents . 7
64 Figure 2 — Power supply functional elements . 16
65 Figure 3 — Types of connection points served by the power distribution system . 17
66 Figure 4 — Example of a single path to primary distribution equipment with a single source (Class 1) . 27
67 Figure 5 — Example of a single path to primary distribution equipment with a redundant source (Class 2)27
Figure 6 — Example of multiple paths to primary distribution equipment with a redundant source (Class 3)29
Figure 7 — Example of a multiple path to primary distribution equipment with multiple sources (Class 4)30
Figure 8 — Example of single path power distribution system (Class 1) . 35
Figure 9 — Example of single path power distribution system with redundancy (Class 2) . 36
Figure 10 — Example of multiple paths providing a concurrent/repair operate solution (Class 3) . 37
Figure 11 — Example of a multiple path, fault tolerant solution except during maintenance (Class 4) . 38
74 Figure 12 — Possible measurement points . 42
75 European foreword
76 This document (prEN 50600-2-2:2026) has been prepared by CLC/TC 215 “Electrotechnical aspects of
77 telecommunication equipment”.
78 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)
79 This document will supersede EN 50600-2-2:2019.
80 prEN 50600-2-2:2026 includes the following significant technical changes with respect to EN 50600-2-2:2019:
81 a) the whole document has been revised technically and editorially, aligning with EN 50600-1 and
82 EN 50600-2-3;
83 b) resource enablement aspects included;
84 c) several terms and definitions (Clause 3) revised, e.g. “demarcation point” replaced by “virtual point” and
85 “socket” replaced by the more general term “termination point”;
86 d) Clause 5 updated, e.g. regarding energy efficiency and environmental impact considerations;
87 e) Clause 6 updated: new elements include provisioning, forecasting and management of ICT equipment and
88 facility infrastructure for capacity planning; resilience criteria based on KPIs; power quality requirements
89 and recommendations revised; subclause 6.7 on control system capacity planning added.
90 f) Clause 7 editorially improved;
91 g) Clause 8 revised, in particular with respect to the quality of measurements and the presentation of
92 Granularity Level requirements.
93 Introduction
94 The unrestricted access to internet-based information demanded by the information society has led to an
95 exponential growth of both internet traffic and the volume of stored/retrieved data. Data centres are housing and
96 supporting the information technology and network telecommunications equipment for data processing, data
97 storage and data transport. They are required both by network operators (delivering those services to customer
98 premises) and by enterprises within those customer premises.
99 Data centres usually need to provide modular, scalable and flexible facilities and infrastructures to easily
100 accommodate the rapidly changing requirements of the market. In addition, energy consumption and
101 water/resource usage of data centres has become critical both from an environmental point of view (reduction
102 of environmental footprint) and with respect to economical considerations (cost of energy) for the data centre
103 operator.
104 The implementation of data centres varies in terms of:
105 a) purpose (enterprise, co-location, co-hosting or network operator facilities);
106 b) security level;
107 c) physical size;
108 d) accommodation (mobile, temporary and permanent constructions).
109 The needs of data centres also vary in terms of availability of service, the provision of security and the objectives
110 for energy efficiency. These needs and objectives influence the design of data centres in terms of building
111 construction, power distribution, environmental control, telecommunications cabling and physical security as
112 well as the operation of the data centre. Effective management and operational information is required to monitor
113 achievement of the defined needs and objectives.
114 Recognizing the substantial resource consumption, particularly of energy, of larger data centres, it is also
115 important to provide tools for the assessment of that consumption both in terms of overall value and of source
116 mix and to provide Key Performance Indicators (KPIs) to evaluate trends and drive performance improvements.
117 At the time of publication of this document, the EN 50600 series have been designed as a framework of
118 standards, technical specifications and technical reports covering the design, the operation and management,
119 the key performance indicators for energy efficient operation of the data centre as well as a maturity model for
120 energy management and environmental sustainability.
121 This series of documents specifies requirements and recommendations to support the various parties involved
122 in the design, planning, procurement, integration, installation, operation and maintenance of facilities and
123 infrastructures within data centres. These parties include:
124 1) owners, operators, facility managers, ICT managers, project managers, main contractors;
125 2) consulting engineers, architects, building designers and builders, system and installation designers,
126 auditors, test and commissioning agents;
127 3) facility and infrastructure integrators, suppliers of equipment;
128 4) installers, maintainers.
129 The inter-relationship of the documents within the EN 50600 series is shown in Figure 1.
131 Figure 1 — Schematic relationship between EN 50600 series of documents
132 EN 50600-1 introduces the general concepts relevant for the design and operation of data centres.
133 EN 50600-2-X documents define the requirements for the data centre design and specify requirements and
134 recommendations for particular facilities and infrastructures to support the relevant classification for
135 “availability”, “physical security” and “energy efficiency enablement” selected from EN 50600-1.
136 EN 50600-3-1 specifies requirements and recommendations for data centre operations, processes and
137 management.
138 EN 50600-4-X documents specify requirements and recommendations for key performance indicators (KPIs)
139 used to assess and improve the resource usage efficiency and effectiveness, respectively, and criteria of
140 resilience of a data centre.
141 CLC/TS 50600-5-1 specifies the maturity model for energy management and environmental sustainability and
142 refers amongst others to EN 50600-4-X for KPIs as appropriate.
143 At the time of publication of this document, EN 50600-2 series comprises the following documents:
144 EN 50600-2-1: Information technology — Data centre facilities and infrastructures — Part 2-1: Building
145 construction;
146 EN 50600-2-2: Information technology — Data centre facilities and infrastructures — Part 2-2: Power supply
147 and distribution;
148 EN 50600-2-3: Information technology — Data centre facilities and infrastructures — Part 2-3: Environmental
149 control;
150 EN 50600-2-4: Information technology — Data centre facilities and infrastructures — Part 2-4:
151 Telecommunications cabling infrastructure;
152 EN 50600-2-5: Information technology — Data centre facilities and infrastructures — Part 2-5: Security
153 systems;
154 CLC/TS 50600-2-10: Information technology — Data centre facilities and infrastructures — Part 2-10:
155 Earthquake risk and impact analysis.
156 This document, EN 50600-2-2, addresses facilities and infrastructures for power supplies to, and power
157 distribution within, data centres together with the interfaces for monitoring the performance of those facilities
158 and infrastructures in line with EN 50600-3-1 and the EN 50600-4 series (in accordance with the requirements
159 of EN 50600-1). The line diagrams used in certain Figures are not intended to replace the more familiar electrical
160 circuit diagrams associated with power supply and distribution systems.
161 This document is intended for use by and collaboration between architects, building designers and builders,
162 system and installation designers.
163 This series of European Standards does not address the selection of information technology and network
164 telecommunications equipment, software and associated configuration issues.
165 1 Scope
166 This document addresses power supplies to, and power distribution within, data centres based upon the criteria
167 and classifications for “availability”, “physical security” and “resource and energy efficiency enablement” within
168 EN 50600-1.
169 This document specifies requirements and recommendations for the following:
170 a) power supplies to data centres;
171 b) power distribution systems to all equipment within data centres;
172 c) telecommunications infrastructure bonding;
173 d) lightning protection;
174 e) devices for the measurement of the energy consumption and power quality characteristics at points along
175 the power distribution system and their integration within management tools.
176 Safety and electromagnetic compatibility (EMC) requirements are outside the scope of this document and are
177 covered by other standards and regulations. However, information given in this document can be of assistance
178 in meeting these standards and regulations.
179 2 Normative references
180 The following documents are referred to in the text in such a way that some or all of their content constitutes
181 requirements of this document. For dated references, only the edition cited applies. For undated references, the
182 latest edition of the referenced document (including any amendments) applies.
183 EN 13160 (all parts), Leak detection systems
184 EN 50160:2022, Voltage characteristics of electricity supplied by public electricity networks
185 EN 50174-2, Information technology - Cabling installation - Part 2: Installation planning and practices inside
186 buildings
187 EN 50174-3, Information technology - Cabling installation - Part 3: Installation planning and practices outside
188 buildings
189 EN 50310, Telecommunications bonding networks for buildings and other structures
190 EN 50600-1, Information technology - Data centre facilities and infrastructures - Part 1: General concepts
191 EN 50600-2-3, Information technology - Data centre facilities and infrastructures - Part 2-3: Environmental
192 control
193 EN 50600-2-4, Information technology – Data centre facilities and infrastructures – Part 2-4: Telecommuni-
194 cations cabling infrastructure
195 EN 50600-2-5, Information technology - Data centre facilities and infrastructures - Part 2-5: Security systems
196 EN IEC 60076-11, Power transformers - Part 11: Dry-type transformers
———————
As impacted by EN 50160:2022/A1:2025.
197  Low-voltage switchgear and controlgear (IEC 60947)
EN IEC 60947 (all parts),
198 EN IEC 61000-2-4:2024, Electromagnetic compatibility (EMC) - Part 2-4: Environment - Compatibility levels in
199 power distribution systems in industrial locations for low-frequency conducted disturbances
200 Low-voltage switchgear and controlgear assemblies (IEC 61439)
EN IEC 61439 (all parts),
201 EN IEC 61557-12:2022, Electrical safety in low voltage distribution systems up to 1 000 V AC and 1 500 V DC
202 - Equipment for testing, measuring or monitoring of protective measures - Part 12: Power metering and
203 monitoring devices (PMD)
204 EN 61869-2:2012, Instrument transformers - Part 2: Additional requirements for current transformers
205 Uninterruptible power systems (UPS) (IEC 62040)
EN IEC 62040 (all parts),
206 EN 62053-21:2021, Electricity metering equipment (a.c.) - Particular requirements - Part 21: Static meters for
207 active energy (classes 1 and 2)
208 EN IEC 62271-200, High-voltage switchgear and controlgear - Part 200: AC metal-enclosed switchgear and
209 controlgear for rated voltages above 1 kV and up to and including 52 kV
210 EN IEC 62305 (all parts), Protection against lightning (IEC 62305)
211 EN IEC 62305-4, Protection against lightning - Part 4: Electrical and electronic systems within structures
212 EN 62586-1:2017, Power quality measurement in power supply systems - Part 1: Power quality instruments
213 (PQI)
214 Power quality measurement in power supply systems – Part 2: Functional tests and
EN 62586-2:2017,
215 uncertainty requirements
216 EN IEC 62974-1, Monitoring and measuring systems used for data collection, aggregation and analysis - Part
217 1: Device requirements
218 EN 88528-11, Reciprocating internal combustion engine driven alternating current generating sets - Part 11:
219 Rotary uninterruptible power systems - Performance requirements and test methods
220 HD 60364 (all parts), Low-voltage electrical installations
221 IEC/TS 60076-20:2017, Power transformers - Part 20: Energy efficiency
222 3 Terms, definitions and abbreviations
223 3.1 Terms and definitions
224 For the purposes of this document, the terms and definitions given in EN 50600-1 and the following apply.
225 ISO and IEC maintain terminology databases for use in standardization at the following addresses:
———————
Some documents of the series are still published as “EN 60947-X”.
Some documents of the series are still published as “EN 61439-X”.
Some documents of the series are still published as “EN 62040-X”.
As impacted by EN 62586-2:2017/A1:2021 and EN 62586-2:2017/AC:2018-09.
— IEC Electropedia: available at http://www.electropedia.org/
227 — ISO Online browsing platform: available at http://www.iso.org/obp
228 3.1.1
229 active power
230 under periodic conditions, mean value, taken over one period T, of the instantaneous power p
T
231 P= pdt
∫
T
232 Note 1 to entry: Under sinusoidal conditions, the active power is the real part of the complex power S, thus P = Re S.
233 Note 2 to entry: The coherent SI unit for active power is watt, W.
234 [SOURCE: IEC 60050-131:2002, 131-11-42]
235 3.1.2
236 additional supply
237 power supply that provides power in the event of failure of primary and/or secondary supply
238 3.1.3
239 apparent power
240 product of the rms voltage U between the terminals of a two-terminal element or two-terminal circuit and the
241 rms electric current I in the element or circuit S = UI
242 Note 1 to entry: Under sinusoidal conditions, the apparent power is the modulus of the complex power S, thus S = |S| .
243 Note 2 to entry: The coherent SI unit for apparent power is voltampere, VA.
244 [SOURCE: IEC 60050-131:2002, 131-11-41]
245 3.1.4
246 capacitive load
247 load that is capacitive, so that the alternating current is out of phase with and leads the voltage
248 3.1.5
249 catenary
250 wire hung at a specific tension between supporting structures of power cabling
251 3.1.6
252 connection point
253 socket/outlet or a connection enabling supply of power to attached/connected equipment
254 Note 1 to entry: This can be a de-mateable or a hardwired connection.
255 3.1.7
256 diverse route
257 alternative, separate, pathway intended to provide adequate segregation from another pathway, in order to
258 provide resilient service provision in the event of physical damage to one of the pathways
259 3.1.8
260 dual-corded equipment
261 equipment served by multiple power supply input interfaces
262 3.1.9
263 emergency power off
264 designated device to provide emergency switching which disconnects power from one or more data centre
265 facilities, infrastructures or spaces
266 Note 1 to entry: The configuration and function of emergency power off devices can be subject to national or local regulations.
267 3.1.10
268 fire compartment
269 discrete zone designed to contain a fire within that zone
270 3.1.11
271 high voltage
272 ≤ 150 kV
voltage with a nominal rms-value 36 kV < Un
273 Note 1 to entry: Whereas in most other standards HV covers the total AC-voltage- range > 1 kV, for the purpose of this
274 document this range is separated in the three parts MV, HV, and EHV.
275 [SOURCE: EN 50160:2022, 3.2.2]
276 3.1.12
277 integrated energy storage
278 IES
279 uninterruptible power supply, integrated inside electric devices, e.g. ICT equipment
280 3.1.13
281 inductive load
282 load that is inductive, so that the alternating current is out of phase with and lags behind the voltage
283 3.1.14
284 ICT load
285 electrical consumption of all the information, communication technology equipment, providing data storage,
286 processing and transport services
287 3.1.15
288 load factor
289 ratio, expressed as a numerical value or as a percentage, of the consumption within a specified period (year,
290 month, day, etc.), to the consumption that would result from continuous use of the maximum or other specified
291 demand occurring within the same period
292 Note 1 to entry: This term should not be used without specifying the demand and the period to which it relates.
293 Note 2 to entry: The load factor for a given demand is also equal to the ratio of the utilization time to the time in hours within
294 the same period.
295 [SOURCE: IEC 60050-691:1973, 691-10-02]
296 3.1.16
297 locally protected connection point
298 socket/outlet or a connection which continues to deliver power to connected equipment for a defined period
299 following failure of power supply and distribution equipment by means of a battery supply or UPS adjacent to,
300 or co-located with, those connections
301 3.1.17
302 low voltage
303 voltage whose nominal r.m.s. value is Un ≤ 1 kV
304 [SOURCE: EN 50160:2010, 3.9]
305 3.1.18
306 main-tie-tie-main
307 electrical connection between two power supply or power distribution circuits which allows current to flow in
308 either direction and containing two circuit breakers enabling maintenance while one of the circuits is active
309 3.1.19
310 medium voltage
311 voltage whose nominal r.m.s. value is 1 kV < U ≤ 36 kV
n
312 Note 1 to entry: Because of existing network structures, in some countries the boundary between MV and HV can be
313 different.
314 [SOURCE: EN 50160:2010, 3.11]
315 3.1.20
316 pathway
317 defined route for cables between termination points
318 [SOURCE: EN 50174-1:2018, 3.1.31]
319 3.1.21
320 power factor
321 under periodic conditions, ratio of the absolute value of the active power P to the apparent power S: λ = |P|/S
322 Note 1 to entry: The ratio of the active (real) power flowing to the load to the apparent power (as a result of the capacitive
323 or inductive nature of the load) and is a dimensionless number between 0 and 1.
324 [SOURCE: IEC 60050-131:2002, 131-11-46, modified: Note 1 to entry reworded]
325 3.1.22
326 primary distribution equipment
327 equipment which is required to manage, control and/or convert incoming power supplies (primary, secondary
328 and, where appropriate, additional) in a form suitable for distribution by secondary distribution equipment
329 3.1.23
330 primary supply
331 principal power supply that provides power to the data centre under normal operating conditions
332 3.1.24
333 protected connection point
334 socket/outlet or a connection which continues to deliver power to connected equipment for a defined period
335 following failure of power supply and distribution equipment
336 3.1.25
337 secondary distribution equipment
338 equipment which is required to manage, control and distribute the power provided by the primary distribution
339 equipment to the short-break, protected and unprotected connection points within the data centre and to the
340 tertiary distribution equipment
341 Note 1 to entry: The power supply can be single-phase AC, three-phase AC or DC. If there is a change from 3-phase to 1-
342 phase supply, this is generally achieved at the secondary distribution equipment that is served directly from the primary
343 distribution equipment.
344 3.1.26
345 secondary supply
346 power supply independent from the primary supply, and that is continuously available to be used to provide
347 power to the data centre
348 Note 1 to entry: A second feed to a separate transformer from the same grid is not a secondary supply.
349 3.1.27
350 short-break connection point
351 sockets/outlet or a connection which, upon failure of power supply and distribution equipment, will be provided
352 with power from an additional supply after a defined period
353 3.1.28
354 tertiary distribution equipment
355 power supply equipment, typically accommodated within the cabinets, frames and racks of the data centre
356 spaces, which directly feeds the protected connection points therein
357 3.1.29
358 unprotected connection point
359 socket/outlet or a connection which fails to deliver power to connected equipment following failure in power
360 supply or distribution equipment
361 3.1.30
362 virtual point
363 virtual interface between the power supply system and power distribution system infrastructures
364 3.2 Abbreviations
365 For the purposes of this document, the abbreviations given in EN 50600-1 and the following apply.
AC alternating current
DC direct current
EMC electromagnetic compatibility
ERF energy reuse factor
EPO emergency power off
ICT information and communication technology
IES integrated energy storage
HV high voltage
KPI key performance indicator
LV low voltage
LSC loss of service continuity
MV medium voltage
PMF power metering and monitoring function
PUE power usage effectiveness
dPUE designed power usage effectiveness
PMD power metering and monitoring device
REF renewable energy factor
r.m.s. root mean square
SPD surge protective device
TN-S terra neutral - separation
UPS uninterruptible power system
366 3.3 Symbols
367 For the purposes of this document, the following symbols apply.
λ power factor
P real or active power
S complex power
S apparent power, the magnitude, or modulus, of complex power
T one time period
U root mean square (r.m.s.) voltage
I root mean square (r.m.s.) current
368 4 Conformance
369 For a data centre to conform to this document:
370 a) it shall feature a power supply and distribution design solution that meets both the general requirements,
371 and the required Availability Class, of Clause 6;
372 b) the environmental controls applied to the spaces accommodating the power supply and distribution system
373 within the premises and serving the data centre shall be in accordance with EN 50600-2-3;
374 c) it shall feature an approach to physical security in relation to the power supply and distribution solution that
375 meets the requirements of Clause 7;
376 d) it shall feature an energy efficiency enablement solution that meets the requirements of the relevant
377 Granularity Level of Clause 8;
378 e) the telecommunications bonding system within the computer room and telecommunications spaces of the
379 data centre shall be in accordance with the local mesh bonding requirements of EN 50310;
380 f) where lightning protection is required, it shall be in accordance with the EN IEC 62305 series and
381 EN 50310;
382 g) the design of low voltage (LV) power supply and distribution installations shall be in accordance with the
383 HD 60364 series;
384 The Availability Class of the power distribution infrastructure is based on the required Availability Class of the
385 data centre. The power supply infrastructure shall be of the same or higher Availability Class.
386 5 Power supply and distribution within data centres
387 5.1 Functional elements
388 5.1.1 General
389 The distribution of electrical power is one of the most important aspects of data centre infrastructure.
390 Disturbances of power supply voltage, current and frequency have a direct effect on the operational safety of
391 the data centre infrastructure and its availability.
392 The functional elements of power supply and distribution to the data centre are described as:
393 — sources: e.g. primary, secondary or additional supplies;
394 — devices: e.g. supply transfer switchgear;
395 — paths: pathways, spaces and cabling.
396 Typical sources and devices of power supply to and distribution within data centres are described in Table 1.
397 The requirements and recommendations for the provision of physical security to the spaces accommodating
398 the functional elements are described in Clause 7.
399 Implementations need not include all of the elements listed in Table 1. Also the types of equipment comprising
400 certain functional elements can exist in both the area of supply and distribution.
401 Energy efficiency and environmental impact should be considered in accordance with CLC/TS 50600-5-1.
402 Table 1 — Typical functional elements of power supply and distribution
Area Functional element Typical accommodation
(using spaces of EN 50600-1)
Primary supply Transformer space
Secondary supply
Supply transfer equipment (where Electrical space
Supply
multiple supplies exists)
Additional supply (e.g. generator, Generator space or electrical space
uninterruptible power system (UPS))
Primary distribution equipment Electrical distribution space
Transformer space (if required)
UPS Electrical space (or computer room space)
DC power supply
Distribution
Secondary distribution equipment Electrical space (but also present in many
other areas)
Transformer space (if required)
Tertiary distribution equipment Computer room spaces or spaces requiring
provision of protected supplies
403 5.1.2 Power supply to the data centre
404 The power supply schematic of Figure 2 indicates two implementations. Figure 2 a) shows the minimum
405 implementation comprising a single source (primary power supply) only. Figure 2 b) shows multiple sources and
406 includes a secondary supply and also an additional supply that provides power to relevant equipment in the
407 data centre.
408 The primary and secondary supplies are typically provided from transformers which can be within the premises
409 containing the data centre (and can be owned by either the utility or the data centre premises owner) or external
410 and owned by the utility (and not considered to be a functional element of the data centre).
411 An additional supply is one of the possible functional elements for supplying the data centre with power. The
412 additional supply will provide energy in case the primary and secondary supplies are not available. Therefore,
413 parameters such as the sizing, the basic design as well as the availability of the overall power supply concept
414 shall be precisely planned.
415 While the additional supply is typically a locally managed supply, it can be provided by a separate utility supply
416 that it is protected from failures in the primary or secondary supplies. If the additional supply is a locally managed
417 supply, with no connection to the utility, it shall be designed to be able to replace the power supply(ies) in case
418 of their failure.
419 The primary distribution equipment can also contain transformers.
421 a) minimum implementation
423 b) multiple sources
424 Figure 2 — Power supply functional elements
425 The primary distribution equipment provides the interface between the supply and distribution areas.
426 The input to the primary distribution equipment can be LV and/or MV.
427 The output from the primary distribution equipment can be LV and/or MV depending upon the size of the
428 premises and the input requirements of any uninterruptible power system (UPS) or DC supply equipment
429 installed between the primary and secondary distribution equipment.
430 5.1.3 Power distribution within the data centre
431 The functional elements of the power distribution within the data centre are described as:
432 — devices: e.g. primary, secondary and tertiary distribution equipment, UPS;
433 — paths: pathways, spaces and cabling that connects the devices.
434 The distribution system is shown in Figure 3. The power is distributed via one or more instances of secondary
435 distribution equipment. These and subsequent figures adopt a system level approach to the implementation.
436 The input to the secondary distribution equipment can be LV and/or MV.
437 Equipment within the power distribution system may also contain transformers.
439 Figure 3 — Types of connection points served by the power distribution system
440 Within Figure 3 the power is provided to connection points in the distribution area that are categorized as:
441 1) unprotected connection points: suitable for equipment that is not critical to the function of the data centre
442 (e.g. powering of tools and equipment required for the maintenance of the facility);
443 2) protected connection points: intended for equipment that is critical to the function of the data centre (e.g.
444 information technology and network telecommunications equipment, certain elements of environmental
445 control and security systems) and which cannot tolerate failure of supply, served by solutions including
446 UPS installed as part of the distribution system;
447 3) locally protected connection points: intended for equipment served by solutions including UPS or local
448 battery supplies installed at or close to the connection point;
449 4) short-break connection points (available where the primary and/or secondary power supply is augmented
450 with an additional supply): intended for equipment (e.g. environmental control equipment and certain
451 lighting systems) that is critical to the function of the data centre but which can tolerate a failure of supply
452 for a defined period before the additional supply (e.g. generator) is brought into service.
453 A combination of short-break connection point and ICT equipment with integrated energy storage can be used
454 to define power distribution path(s) for the different Availability Classes. The necessary autonomy time as well
455 as the resulting impacts, e.g risk of fire, etc. shall be considered in the business and risk analysis (EN 50600-1)
456 and, if necessary, additional r
...