SIST EN 50600-2-2:2014

Information technology - Data centre facilities and infrastructures - Part 2-2: Power distribution

This European Standard addresses power supplies to, and power distribution within, data centres based upon the criteria and classifications for “availability”, “physical security” and “energy efficiency enablement” within EN 50600-1.This European Standard specifies requirements and recommendations for the following:
a) power supplies to data centres;
b) power distribution systems within data centres;
c) facilities for both normal and emergency lighting;
d) equipotential bonding and earthing;
e) lightning protection;
f) devices for the measurement of the power consumption characteristics at points along the power distribution system and their integration within management tools. Safety and electromagnetic compatibility (EMC) requirements are outside the scope of this European Standard and are covered by other standards and regulations. However, information given in this European Standard may be of assistance in meeting these standards and regulations. Conformance of data centres to the present document is covered in Clause 4.

Informationstechnik - Einrichtungen und Infrastrukturen von Rechenzentren - Teil 2-2: Stromversorgung

Informacijska tehnologija - Naprave in infrastruktura podatkovnega centra - 2-2. del: Distribucija električne energije

Ta evropski standard zajema napajanje podatkovnih centrov in distribucijo električne energije v okviru teh centrov na osnovi kriterijev in klasifikacij »razpoložljivosti«, »fizične varnosti« in »omogočanja energijske učinkovitosti« v okviru standarda EN 50600-1. Ta evropski standard določa zahteve in podaja priporočila za:
a) napajanje podatkovnih centrov,
b) sisteme za distribucijo električne energije v podatkovnih centrih,
c) prostore za običajno in zasilno razsvetljavo,
d) izenačevanje potencialov in ozemljitev,
e) zaščito pred udarom strele,
f) naprave za merjenje značilnosti porabe energije na točkah vzdolž sistema za distribucijo električne energije in njihovo integracijo z orodji za upravljanje. Varnostne zahteve in zahteve za elektromagnetno združljivost (EMC) ne sodijo v področje uporabe tega evropskega standarda in so zajete v drugih standardih in predpisih. Kljub temu lahko informacije v tem evropskem standardu pripomorejo k izpolnjevanju teh standardov in predpisov. Skladnost podatkovnih centrov s tem dokumentom je zajeta v točki 4.

General Information

• Status: Withdrawn
• Public Enquiry End Date: 31-Jan-2013
• Publication Date: 16-Apr-2014
• Withdrawal Date: 11-Jan-2023
• ICS: 29.240.01 - Power transmission and distribution networks in general
• ICS: 35.110 - Networking
• Technical Committee: ELI - Electrical and communication installations
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 12-Jan-2023
• Due Date: 04-Feb-2023
• Completion Date: 12-Jan-2023
• Mandate: M/462 - Standardisation mandate addressed to CEN, CENELEC and ETSI in the field of ICT to enable efficient energy use in fixed and mobile information and communication networks
• Ref Project: EN 50600-2-2:2014 - Information technology - Data centre facilities and infrastructures - Part 2-2: Power distribution

Relations

• Replaced By: SIST EN 50600-2-2:2019 - Information technology - Data centre facilities and infrastructures - Part 2-2: Power supply and distribution
• Effective Date: 01-Sep-2019

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 50600-2-2:2014
01-maj-2014
,QIRUPDFLMVNDWHKQRORJLMD1DSUDYHLQLQIUDVWUXNWXUDSRGDWNRYQHJDFHQWUD
GHO'LVWULEXFLMDHOHNWULþQHHQHUJLMH
Information technology - Data centre facilities and infrastructures - Part 2-2: Power
distribution
Informationstechnik - Einrichtungen und Infrastrukturen von Rechenzentren - Teil 2-2:
Stromversorgung
Ta slovenski standard je istoveten z: EN 50600-2-2:2014
ICS:
29.240.01 2PUHåMD]DSUHQRVLQ Power transmission and
GLVWULEXFLMRHOHNWULþQHHQHUJLMH distribution networks in
QDVSORãQR general
35.110 Omreževanje Networking
SIST EN 50600-2-2:2014 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 50600-2-2:2014

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SIST EN 50600-2-2:2014

EUROPEAN STANDARD
EN 50600-2-2

NORME EUROPÉENNE
March 2014
EUROPÄISCHE NORM

ICS 35.020; 35.110; 91.140.50


English version


Information technology -
Data centre facilities and infrastructures -
Part 2-2: Power distribution


 Informationstechnik -
Einrichtungen und Infrastrukturen von
Rechenzentren -
Teil 2-2: Stromversorgung



This European Standard was approved by CENELEC on 2014-01-06. 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.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the CEN-CENELEC Management Centre or to any CENELEC member.

This European Standard exists 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, Former Yugoslav Republic of Macedonia, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands,
Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

CEN-CENELEC Management Centre: Avenue Marnix 17, B - 1000 Brussels


© 2014 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50600-2-2:2014 E

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SIST EN 50600-2-2:2014
EN 50600-2-2:2014 – 2 –
Contents
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 . 11
4 Conformance . 12
5 Power supply and distribution within data centres . 12
5.1 General . 12
5.2 Dimensioning of power distribution systems. 15
6 Availability . 15
6.1 General requirements . 15
6.2 Power supply . 16
6.3 Power distribution . 24
6.4 Incorporation of LVDC distribution . 28
6.5 Additional considerations . 28
6.6 Emergency Power Off (EPO) . 28
7 Physical security . 29
7.1 General . 29
7.2 Access . 29
7.3 Internal environmental events . 29
7.4 External environmental events . 30
8 Energy efficiency enablement and power distribution . 30
8.1 General . 30
8.2 Granularity Level 1 . 31
8.3 Granularity Level 2 . 31
8.4 Granularity Level 3 . 31
8.5 Cabling infrastructure to support energy efficiency enablement. 32
Annex A (informative) Example implementations of power distribution . 33
A.1 Symbology. 33

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SIST EN 50600-2-2:2014
– 3 – EN 50600-2-2:2014
A.2 Example implementations . 33
Bibliography . 36

Figures
Figure 1 — Schematic relationship between the EN 50600 standards . 6
Figure 2 — Power supply functional elements . 13
Figure 3 —Secondary and tertiary power distribution systems . 14
Figure 4 — Example of single path solution for power supply . 21
Figure 5 — Example of “single path resilient” solution for power supply . 22
Figure 6 — Example of “multi-path resilience with concurrent repair/operate” solution for power
supply . 22
Figure 7 — Example of fault tolerant design solution for power supply . 23
Figure 8 — Example of single path solution for power distribution . 27
Figure 9 — Example of “single path resilient” solution for power distribution . 27
Figure 10 — Example of “multi-path resilience with concurrent repair/operate” solution for power
distribution . 27
Figure 11 — Example of fault tolerant design solution for power distribution . 28
Figure 12 — Possible measurement points . 30
Figure A.1 — Example for a Class 1/Class 2 power distribution . 34
Figure A.2 — Example for a Class 3/Class 4 power distribution . 35

Tables
Table 1 — Functional elements of power distribution . 13

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SIST EN 50600-2-2:2014
EN 50600-2-2:2014 – 4 –
Foreword
This document (EN 50600-2-2:2014) has been prepared by CLC/TC 215 “Electrotechnical aspects of
telecommunication equipment”.
The following dates are fixed:
(dop) 2015-01-06
• latest date by which this document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2015-01-06
standards conflicting with this
document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent
rights.
This document has been prepared under a mandate given to CENELEC by the European Commission
and the European Free Trade Association.

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SIST EN 50600-2-2:2014
– 5 – EN 50600-2-2:2014
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 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 carbon 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 and physical security. Effective
management and operational information is required to monitor achievement of the defined needs and
objectives.
This series of European Standards 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, facility managers, ICT managers, project managers, main contractors;
2) consultants, architects, building designers and builders, system and installation designers;
3) facility and infrastructure integrators, suppliers of equipment;
4) installers, maintainers.
At the time of publication of this European Standard, EN 50600 series will comprise the following
standards:
EN 50600-1: Information technology — Data centre facilities and infrastructures — Part 1: General
concepts;
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
distribution;
EN 50600-2-3: Information technology — Data centre facilities and infrastructures — Part 2-3:
Environmental control;

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SIST EN 50600-2-2:2014
EN 50600-2-2:2014 – 6 –
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;
EN 50600-2-6: Information technology — Data centre facilities and infrastructures — Part 2-6:
Management and operational information.
The inter-relationship of the standards within the EN 50600 series is shown in Figure 1.
EN 50600-2-1
Building construction
EN 50600-2-2
Power distribution
EN 50600-2-3
Environmental control
EN 50600-1
General concepts
EN 50600-2-4
Telecommunications
cabling infrastructure
EN 50600-2-5
Security systems
EN 50600-2-6
Management and
operational information

Figure 1 — Schematic relationship between the EN 50600 standards
EN 50600-2-X standards 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.
This European Standard addresses facilities and infrastructures for power supplies to, and power
distribution within, data centres together with the interfaces for monitoring the performance of those
facilities and infrastructures in line with EN 50600-2-6 (in accordance with the requirements of
EN 50600-1). The line diagrams used in certain figures are not intended to replace the more familiar
electrical circuit diagrams associated with power supply and distribution systems which are included
where relevant.
This European Standard 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.

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SIST EN 50600-2-2:2014
– 7 – EN 50600-2-2:2014
1 Scope
This European Standard addresses power supplies to, and power distribution within, data centres based
upon the criteria and classifications for “availability”, “physical security” and “energy efficiency
enablement” within EN 50600-1.
This European Standard specifies requirements and recommendations for the following:
a) power supplies to data centres;
b) power distribution systems within data centres;
c) facilities for both normal and emergency lighting;
d) equipotential bonding and earthing;
e) lightning protection;
f) devices for the measurement of the power consumption characteristics at points along the power
distribution system and their integration within management tools.
Safety and electromagnetic compatibility (EMC) requirements are outside the scope of this European
Standard and are covered by other standards and regulations. However, information given in this
European Standard may be of assistance in meeting these standards and regulations.
Conformance of data centres to the present document is covered in Clause 4.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
EN 50160:2010, Voltage characteristics of electricity supplied by public electricity networks
EN 50174-2, Information technology – Cabling installation – Part 2: Installation planning and practices
inside buildings
EN 50174-3, Information technology – Cabling installation – Part 3: Installation planning and practices
outside buildings
EN 50310, Application of equipotential bonding and earthing in buildings with information technology
equipment
EN 50600-1, Information technology – Data centre facilities and infrastructures – Part 1: General
concepts
EN 50600-2-1, Information technology – Data centre facilities and infrastructures – Part 2-1: Building
construction
1)
EN 50600-2-3 , Information technology – Data centre facilities and infrastructures – Part 2-3:
Environmental control
———————
1)
Draft for formal vote under preparation.

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SIST EN 50600-2-2:2014
EN 50600-2-2:2014 – 8 –
2)
EN 50600-2-4 , Information technology – Data centre facilities and infrastructures – Part 2-4:
Telecommunications cabling infrastructure
3)
EN 50600-2-5 , Information technology – Data centre facilities and infrastructures – Part 2-5: Security
systems
EN 60044-1:1999, Instrument transformers – Part 1: Current transformers (IEC 60044-1:1996, modified)
EN 60947 (all parts), Low-voltage switchgear and controlgear (IEC 60947, all parts)
EN 61000-2-4:2002, Electromagnetic compatibility (EMC) – Part 2-4: Environment – Compatibility levels
in industrial plants for low-frequency conducted disturbances (IEC 61000-2-4:2002)
EN 61439 (all parts), Low-voltage switchgear and controlgear assemblies (IEC 61439, all parts)
EN 62040 (all parts), Uninterruptible power systems (UPS) (IEC 62040, all parts)
EN 62305 (all parts), Protection against lightning (IEC 62305, all parts)
EN 62305-4, Protection against lightning – Part 4: Electrical and electronic systems within structures
(IEC 62305-4)
EN 88528-11, Reciprocating internal combustion engine driven alternating current generating sets –
Part 11: Rotary uninterruptible power systems – Performance requirements and test methods
(IEC 88528-11)
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 50600-1 and the following apply.
3.1.1
active power
real power
product of r.m.s. voltage, r.m.s. current and power factor (expressed as W)
3.1.2
additional supply
backup supply
power supply that provides power in the event of failure of primary and/or secondary supply
3.1.3
apparent power
product of r.m.s. voltage and r.m.s current (expressed as VA)
3.1.4
capacitive load
load that is capacitive, so that the alternating current is out of phase with and leads the voltage
3.1.5
catenary
wire hung at a specific tension between supporting structures of power cabling
———————
2)
Circulated for CENELEC enquiry.
3)
Draft for CENELEC enquiry under preparation.

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SIST EN 50600-2-2:2014
– 9 – EN 50600-2-2:2014
3.1.6
diverse route
alternative, separate, pathway intended to provide adequate segregation from another pathway, in order
to provide resilient service provision in the event of physical damage to one of the pathways
3.1.7
emergency power off
designated device to provide emergency switching which disconnects power from one or more data
centre facilities, infrastructures or spaces
Note 1 to entry: The configuration and function of emergency power off devices may be subject to national or local
regulations.
3.1.8
fire compartment
discrete zone designed to contain a fire within that zone
3.1.9
high voltage
voltage whose nominal r.m.s. value is 36 kV < U ≤ 150 kV
n
Note 1 to entry: Because of existing network structures, in some countries the boundary between MV and HV can
be different.
[SOURCE: EN 50160:2010, 3.7]
3.1.10
inductive load
load that is inductive, so that the alternating current is out of phase with and lags behind the voltage
3.1.11
information technology equipment
equipment providing data storage, processing and transport services together with equipment dedicated
to providing direct connection to core and/or access networks
3.1.12
IT load
electrical consumption of all the information technology equipment measured at its input terminals
including all on-board integrated power supplies and cooling fans
3.1.13
load factor
ratio of the average load to the peak load over a period of time
3.1.14
locally protected supply provision
sockets which continue to deliver power to connected equipment for a defined period following failure of
power supply and distribution equipment by means of a battery supply or UPS adjacent to, or co-located
with, those sockets (e.g. emergency lighting)
3.1.15
low voltage
voltage whose nominal r.m.s. value is U ≤ 1 kV
n
[SOURCE: EN 50160:2010, 3.9]
3.1.16
mechanical cooling load
electrical consumption of all the plant and components used to provide environmental control within the
data centre, generally comprising compressors, controls, fans, pumps and humidifiers

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SIST EN 50600-2-2:2014
EN 50600-2-2:2014 – 10 –
3.1.17
medium voltage
voltage whose nominal r.m.s. value is 1 kV < U ≤ 36 kV
n
Note 1 to entry: Because of existing network structures, in some countries the boundary between MV and HV can
be different.
[SOURCE: EN 50160:2010, 3.11]
3.1.18
pathway
defined route for cables between termination points
[SOURCE: EN 50174-1:2009/A1:2011, 3.1.26]
3.1.19
power factor
under periodic conditions, ratio of the absolute value of the active power P to the apparent power
S: λ = |P|/S
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 or inductive nature of the load) and is a dimensionless number between 0 and 1.
[SOURCE: IEC 60050-131:2002, 131-11-46, modified]
3.1.20
protected supply provision
no break protected supply provision
sockets which continue to deliver power to connected equipment for a defined period following failure of
power supply and distribution equipment
3.1.21
primary distribution equipment
equipment which is required to manage, control and convert incoming power supplies (primary,
secondary and, where appropriate, additional) in a form suitable for distribution by secondary distribution
equipment
3.1.22
primary supply
principal power supply that provides power to the data centre under normal operating conditions
3.1.23
resistive load
load in which the alternating current is in phase with the voltage
Note 1 to entry: The total reactance is zero.
3.1.24
secondary distribution equipment
equipment which is required to manage, control and distribute the power provided by the primary
distribution equipment to the short-break and unprotected sockets within the data centre and to the
tertiary distribution equipment
Note 1 to entry: The power supply may be single-phase AC, three-phase AC or DC. If there is a change from 3-
phase to 1-phase supply, this is generally achieved at the secondary distribution equipment that is served directly
from the primary distribution equipment.

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SIST EN 50600-2-2:2014
– 11 – EN 50600-2-2:2014
3.1.25
secondary supply
power supply that provides power to the data centre in conjunction with the primary supply under normal
operating conditions
3.1.26
short-break supply provision
back-up supported supply provision
sockets which, upon failure of power supply and distribution equipment, will be provided with power from
an additional power supply after a defined period
3.1.27
socket
connection enabling supply of power to attached equipment
Note 1 to entry: This may be a de-mateable or a hardwired connection.
3.1.28
tertiary distribution equipment
power supply equipment, typically accommodated within the cabinets, frames and racks of the data
centre spaces, which directly feeds the protected sockets therein
3.1.29
total harmonic current distortion
measurement of the harmonic distortion present on a current level, defined as the ratio of the sum of the
powers of all harmonic components to the power of the fundamental frequency
3.1.30
total harmonic voltage distortion
measurement of the harmonic distortion present on a voltage level, defined as the ratio of the sum of the
powers of all harmonic components to the power of the fundamental frequency
3.1.31
unprotected supply provision
sockets which fail to deliver power to connected equipment following failure in power supply and
distribution equipment
3.2 Abbreviations
For the purposes of this document, the abbreviations given in EN 50600-1 and the following apply.
AC Alternating Current
DC, dc Direct Current
EPO Emergency Power Off
HV High Voltage
ITE Information technology equipment
LV Low Voltage
MV Medium Voltage
r.m.s. root mean square
SPD Surge Protective Device

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SIST EN 50600-2-2:2014
EN 50600-2-2:2014 – 12 –
THCD Total Harmonic Current Distortion
THVD Total Harmonic Voltage Distortion
TVSS Transient Voltage Surge Suppression
UPS Uninterruptible Power Supply
4 Conformance
For a data centre to conform to this European Standard:
a) it shall feature a power supply and distribution design solution that meets the required Availability
Class of Clause 6 (and is predicted to meet the relevant availability requirements of that clause);
b) the environmental controls applied to the spaces accommodating the power supply and distribution
system within the premises and serving the data centre shall be in accordance with EN 50600-2-3;
c) it shall feature an approach to physical security in relation to the power supply and distribution
solution that meets the requirements of Clause 7;
d) it shall feature an energy efficiency enablement solution that meets the requirements of the relevant
Granularity Level of Clause 8;
e) the equipotential bonding system within the data centre shall be in accordance with the local mesh
earthing requirements of EN 50310;
f) where lightning protection is required, it shall be in accordance with the EN 62305 series applied with
reference to EN 50310;
g) local regulations, including safety, shall be met.
5 Power supply and distribution within data centres
5.1 General
The distribution of electrical power is one of the most important aspects of data centre infrastructure.
Disturbances of power supply voltage, current and frequency have a direct effect on the operational
safety of the data centre infrastructure and its availability.
The functional elements of power supply to and distribution within data centres are described in Table 1.
The requirements and recommendations for the provision of physical security to the spaces
accommodating the functional elements are described in Clause 7.
The primary and secondary supplies are typically provided from a transformer which may either be:
a) within the premises containing the data centre (and may be owned by either the utility or the data
centre premises owner) or
b) external and owned by the utility (and not considered to be a functional element).
The primary and secondary distribution equipment may also contain transformers.
The supply area is shown schematically in Figure 2 and indicates two implementations. The upper
diagram shows the minimum implementation comprising a primary power supply only. The lower diagram

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SIST EN 50600-2-2:2014
– 13 – EN 50600-2-2:2014
includes a secondary supply and also and additionally supply that provides power to relevant equipment
in the data centre, if required, following a failure of the primary and/or secondary power supply.
Table 1 — Functional elements of power distribution
Area Functional element Typical accommodation
(using spaces of EN 50600–1)
Primary supply Transformer space
Secondary supply
Supply transfer equipment (where multiple Electrical space
Supply
supplies exists)
Additional supply (e.g. generator, Generator space or electrical space
uninterruptible power supplies)
Primary distribution equipment Electrical distribution space
Transformer space (if required)
Uninterruptible power supplies (UPS) Electrical space (or computer room space)
Secondary distribution equipment Electrical space (but also present in many
Distribution
other
...

SLOVENSKI STANDARD
oSIST prEN 50600-2-2:2012
01-december-2012
,QIRUPDFLMVNDWHKQRORJLMD1DSUDYHLQLQIUDVWUXNWXUDSRGDWNRYQHJDFHQWUD
GHO'LVWULEXFLMDHOHNWULþQHHQHUJLMH
Information technology - Data centre facilities and infrastructures - Part 2-2: Power
distribution
Informationstechnik - Einrichtungen und Infrastrukturen von Rechenzentren - Teil 2-2:
Stromversorgung
Ta slovenski standard je istoveten z: prEN 50600-2-2:2012
ICS:
35.020 Informacijska tehnika in Information technology (IT) in
tehnologija na splošno general
35.110 Omreževanje Networking
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
oSIST prEN 50600-2-2:2012 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 50600-2-2:2012

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oSIST prEN 50600-2-2:2012
 DRAFT
EUROPEAN STANDARD
prEN 50600-2-2

NORME EUROPÉENNE
September 2012
EUROPÄISCHE NORM

ICS 35.020; 35.110; 91.140.50


English version


Information technology -
Data centre facilities and infrastructures -
Part 2-2: Power distribution



To be completed Informationstechnik -
Einrichtungen und Infrastrukturen von
Rechenzentren -
Teil 2-2: Stromversorgung



This draft European Standard is submitted to CENELEC members for CENELEC enquiry.
Deadline for CENELEC: 2013-03-01.

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, Former Yugoslav Republic of Macedonia, France, Germany,
Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey 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.


CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels


© 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Project: 23543 Ref. No. prEN 50600-2-2:2012 E

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oSIST prEN 50600-2-2:2012
prEN 50600-2-2:2012 – 2 –
1 Content
2 Foreword . 4
3 Introduction . 5
4 1 Scope and conformance . 7
5 1.1 Scope . 7
6 1.2 Conformance . 7
7 2 Normative references. 7
8 3 Terms, definitions and abbreviations . 8
9 3.1 Terms and definitions . 8
10 3.2 Abbreviations . 11
11 4 Power supply and distribution within data centres . 12
12 4.1 General . 12
13 4.2 Scaling . 15
14 5 Availability . 15
15 5.1 General requirements. 15
16 5.2 Power supply . 16
17 5.3 Power distribution . 23
18 5.4 Incorporation of LVDC distribution . 26
19 5.5 Additional considerations . 26
20 5.6 Emergency Power Off (EPO) . 27
21 6 Physical security . 28
22 6.1 General . 28
23 6.2 Access . 28
24 6.3 Internal environmental events . 30
25 6.4 External environmental events . 31
26 7 Energy efficiency enablement and power distribution . 31
27 7.1 General . 31
28 7.2 Complexity Level 1 . 32
29 7.3 Complexity Level 2 . 32
30 7.4 Complexity Level 3 . 33
31 7.5 Cabling infrastructure to support energy efficiency enablement . 33
32 Annex A (informative) Example implementations of power distribution . 34
33 Bibliography . 37

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34 Figures
35 Figure 1 – Schematic relationship between the EN 50600 standards . 6
36 Figure 2 – Power supply functional elements. 13
37 Figure 3 – Basic secondary distribution . 14
38 Figure 4 – Enhanced secondary and tertiary distribution . 15
39 Figure 5 – Example of single path solution for power supply . 21
40 Figure 6 – Example of “single path resilient” solution for power supply . 21
41 Figure 7 – Example of “multi-path resilience with concurrent repair/operate” solution for power supply . 22
42 Figure 8 – Example of fault tolerant design solution for power supply . 22
43 Figure 9 – Example of single path solution for power distribution . 24
44 Figure 10 – Example of “single path resilient” solution for power distribution . 25
45 Figure 11 – Example of “multi-path resilience with concurrent repair/operate” solution for power
46 distribution . 25
47 Figure 12 – Example of fault tolerant design solution for power distribution . 26
48 Figure 13 – Possible measurement points . 31
49 Figure A.1 – Example for a Class 1/Class 2 power distribution . 35
50 Figure A.2 – Example for a Class 3/Class 4 power distribution . 36
51 Tables
52 Table 1 – Functional elements of power distribution . 12
53 Table 2 – Required Protection Classes for the elements of the power supply system . 28
54 Table 3 – Recommended Protection Classes for the elements of the power supply system . 29
55 Table 4 – Required Protection Classes for the elements of the power distribution system . 29
56 Table 5 – Recommended Protection Classes for the elements of the power distribution system . 30
57

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oSIST prEN 50600-2-2:2012
prEN 50600-2-2:2012 – 4 –
58 Foreword
59 This document (prEN 50600-2-2:2012) has been prepared by CLC/TC 215 "Electrotechnical aspects of
60 telecommunication equipment".
61 This document is currently submitted to the Enquiry.
62 This document has been prepared under a mandate given to CENELEC by the European Commission
63 and the European Free Trade Association.

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64 Introduction
65 The unrestricted access to internet-based information demanded by the information society has led to an
66 exponential growth of both internet traffic and the volume of stored/retrieved data. Data centres are
67 housing and supporting the information technology and network telecommunications equipment for data
68 processing, data storage and data transport. They are required both by network operators (delivering
69 those services to customer premises) and by enterprises within those customer premises.
70 Data centres need to provide modular, scalable and flexible facilities and infrastructures to easily
71 accommodate the rapidly changing requirements of the market. In addition, energy consumption of data
72 centres has become critical both from an environmental point of view (reduction of carbon footprint) and
73 with respect to economical considerations (cost of energy) for the data centre operator.
74 The implementation of data centres varies in terms of:
75 a) purpose (enterprise, co-location, co-hosting, or network operator facilities);
76 b) physical size;
77 c) accommodation (mobile, temporary and permanent constructions).
78 The needs of data centres also vary in terms of availability of service, the provision of security and the
79 objectives for energy efficiency. These needs and objectives influence the design of data centres in terms
80 of building construction, power distribution, environmental control and physical security. Effective
81 management and operational information is required to monitor achievement of the defined needs and
82 objectives.
83 This series of European Standards specifies requirements and recommendations to support the various
84 parties involved in the design, planning, procurement, integration, installation, operation and maintenance
85 of facilities and infrastructures within data centres. These parties include:
86 1) owners, facility managers, ICT managers, project managers, main contractors;
87 2) architects, building designers and builders, system and installation designers;
88 3) facility and infrastructure integrators, suppliers of equipment;
89 4) installers, maintainers.
90 At the time of publication of this European Standard, EN 50600 series will comprise the following
91 standards:
92 – EN 50600-1: Information technology – Data centre facilities and infrastructures – Part 1: General
93 concepts;
94 – EN 50600-2-1: Information technology – Data centre facilities and infrastructures – Part 2-1: Building
95 construction;
96 – EN 50600-2-2: Information technology – Data centre facilities and infrastructures – Part 2-2: Power
97 distribution;
98 – EN 50600-2-3: Information technology – Data centre facilities and infrastructures – Part 2-3:
99 Environmental control;
100 – EN 50600-2-4: Information technology – Data centre facilities and infrastructures – Part 2-4:
101 Telecommunications cabling infrastructure;
102 – EN 50600-2-5: Information technology – Data centre facilities and infrastructures – Part 2-5: Security
103 systems;
104 – EN 50600-2-6: Information technology – Data centre facilities and infrastructures – Part 2-6:
105 Management and operational information.
106 The inter-relationship of the standards within the EN 50600 series is shown in Figure 1.

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oSIST prEN 50600-2-2:2012
prEN 50600-2-2:2012 – 6 –
EN 50600-2-1
Building construction
EN 50600-2-2
Power distribution
EN 50600-2-3
Environmental control
EN 50600-1
General concepts
EN 50600-2-4
Telecommunications
cabling infrastructure
EN 50600-2-5
Security systems
EN 50600-2-6
Management and
operational information
107
108 Figure 1 – Schematic relationship between the EN 50600 standards
109 EN 50600-2-X standards specify requirements and recommendations for particular facilities and
110 infrastructures to support the relevant classification for “availability”, “physical security” and ‘energy
111 efficiency enablement” selected from EN 50600-1.
112 This European Standard addresses the power distribution facilities and infrastructure within data centres
113 together with the interfaces for monitoring the performance of those facilities and infrastructures in line
114 with EN 50600-2-6 (in accordance with the requirements of EN 50600-1). The line diagrams used in
115 certain Figures are not intended to replace the more familiar electrical circuit diagrams associated with
116 power supply and distribution systems which are included where relevant.
117 This European Standard is intended for use by and collaboration between architects, building designers
118 and builders, system and installation designers.
119 This series of European Standards does not address the selection of information technology and network
120 telecommunications equipment, software and associated configuration issues.

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121 1 Scope and conformance
122 1.1 Scope
123 This European Standard addresses power distribution within data centres based upon the criteria and
124 classifications for “availability”, “physical security” and “energy efficiency enablement” within EN 50600-1.
125 This European Standard specifies requirements and recommendations for the following:
126 a) power supplies to data centres;
127 b) power distribution systems within data centres;
128 c) facilities for both normal and emergency lighting;
129 d) equipotential bonding and earthing (by reference to EN 50310);
130 e) lightning protection (by reference to EN 50310);
131 f) electrostatic discharge;
132 g) devices for the measurement of the power consumption characteristics at points along the power
133 distribution system and their integration within management tools.
134 Safety and electromagnetic compatibility (EMC) requirements are outside the scope of this European
135 Standard and are covered by other standards and regulations. However, information given in this
136 European Standard may be of assistance in meeting these standards and regulations.
137 1.2 Conformance
138 For a data centre to conform to this European Standard:
139 a) it shall feature a power supply and distribution design solution that meets the required Availability
140 Class of Clause 5 (and is predicted to meet the relevant availability requirements of that clause);
141 b) the environmental controls applied to the spaces accommodating the power supply and distribution
142 system within the premises and serving the data centre shall be in accordance with EN 50600-2-3;
143 c) it shall feature an approach to physical security in relation to the power supply and distribution
144 solution that meets the requirements of Clause 6;
145 d) it shall feature an energy efficiency enablement solution that meets the requirements of the relevant
146 Complexity Level of Clause 7;
147 e) the equipotential bonding system within the data centre shall be in accordance with the local mesh
148 earthing requirements of EN 50310;
149 f) where lightning protection is required, it shall be in accordance with the EN 62305 series applied with
150 reference to EN 50310;
151 g) local regulations, including safety, shall be met.
152 2 Normative references
153 The following documents, in whole or in part, are normatively referenced in this document and are
154 indispensable for its application. For dated references, only the edition cited applies. For undated
155 references, the latest edition of the referenced document (including any amendments) applies.
156 EN 50174-2, Information technology – Cabling installation – Part 2: Installation planning and practices
157 inside buildings
158 EN 50174-3, Information technology – Cabling installation – Part :3 Installation planning and practices
159 outside buildings
160 EN 50310, Application of equipotential bonding and earthing in buildings with information technology
161 equipment

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oSIST prEN 50600-2-2:2012
prEN 50600-2-2:2012 – 8 –
1)
162 FprEN 50600-1:2012 , Information technology – Data centre facilities and infrastructures – Part 1:
163 General concepts
2)
164 EN 50600-2-1 , Information technology – Data centre facilities and infrastructures – Part 2-1: Building
165 construction
3)
166 EN 50600-2-3 , Information technology – Data centre facilities and infrastructures – Part 2-3:
167 Environmental control
3)
168 EN 50600-2-4 , Information technology – Data centre facilities and infrastructures – Part 2-4:
169 Telecommunications cabling infrastructure
3)
170 EN 50600-2-5 , Information technology – Data centre facilities and infrastructures – Part 2-5: Security
171 systems
172 EN 60044-1:1999, Instrument transformers – Part 1: Current transformers (IEC 60044-1:1996, modified)
173 EN 61000-2-4:2002, Electromagnetic compatibility (EMC) – Part 2-4: Environment – Compatibility levels
174 in industrial plants for low-frequency conducted disturbances (IEC 61000-2-4:2002)
175 EN 62040 series, Uninterruptible power systems (UPS) (IEC 62040 series)
176 EN 62305 series, Protection against lightning (IEC 62305 series)
177 EN 62305-4, Protection against lightning – Part 4: Electrical and electronic systems within structures
178 (IEC 62305-4)
179 EN 88528-11, Reciprocating internal combustion engine driven alternating current generating sets –
180 Part 11: Rotary uninterruptible power systems – Performance requirements and test methods
181 (IEC 88528-11)
182 HD 60364-4-444, Low-voltage electrical installations – Part 4-444: Protection for safety – Protection
183 against voltage disturbances and electromagnetic disturbances (IEC 60364-4-44, Clause 444)
184 3 Terms, definitions and abbreviations
185 3.1 Terms and definitions
186 For the purposes of this document, the terms and definitions given in FprEN 50600-1:2012 and the
187 following apply.
188 3.1.1
189 active power
190 real power
191 product of r.m.s. voltage, r.m.s. current and power factor
192 3.1.2
193 additional supply
194 backup supply
195 power supply that provides power in the event of failure of primary and/or secondary supply
196 3.1.3
197 apparent power
198 product of r.m.s. voltage and r.m.s current (expressed as VA)
———————
1) To be published.
2) Circulated for CENELEC enquiry.
3) Under consideration.

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199 3.1.4
200 capacitative load
201 load that is capacitive, so that the alternating current is out of phase with and leads the voltage
202 3.1.5
203 catenary
204 wire hung at a specific tension between supporting power cabling
205 3.1.6
206 diverse route
207 alternative, separate, pathway intended to provide adequate segregation from, in the event of physical
208 damage to, another pathway in order to provide resilient service provision
209 3.1.7
210 emergency power off
211 EPO
212 device intended to provide emergency switching to remove, as quickly as possible, danger that may have
213 occurred unexpectedly
214 3.1.8
215 fire compartment
216 discrete zone designed to contain a fire within that zone
217 3.1.9
218 inductive load
219 load that is inductive, so that the alternating current is out of phase with and lags behind the voltage
220 3.1.10
221 information technology equipment
222 ITE
223 equipment providing data storage, processing and transport services together with equipment dedicated
224 to providing direct connection to core and/or access networks
225 3.1.11
226 IT load
227 electrical consumption of all the information technology equipment measured at its input terminals
228 including all on-board integrated power supplies and cooling fans
229 3.1.12
230 load factor
231 ratio of the average load to the peak load over a period of time
232 3.1.13
233 locally protected supply provision
234 sockets which continue to deliver power to connected equipment for a defined period following failure of
235 power supply and distribution equipment by means of a battery supply or UPS adjacent to, or co-located
236 with, that socket (e.g. emergency lighting)
237 3.1.14
238 mechanical cooling load
239 electrical consumption of all the plant and components used to provide environmental control within the
240 data centre, generally comprising compressors, controls, fans, pumps and humidifiers
241 3.1.15
242 medium voltage
243 voltage lying between the limits for low and high voltage which, for the purposes of this document, are
244 AC 1 kV to AC 72,5 kV

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245 3.1.16
246 pathway
247 defined route for cables between termination points
248 [SOURCE: EN 50174-1:2009/A1:2011, 3.1.26]
249 3.1.17
250 power factor
251 under periodic conditions, ratio of the absolute value of the active power P to the apparent power S:
252 λ = |P|/S
253 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 or
254 inductive nature of the load) and is a dimensionless number between 0 and 1.
255 [SOURCE: IEC 60050-131:2002, 131-11-46 modified]
256 3.1.18
257 protected supply provision
258 no break protected supply provision
259 sockets which continue to deliver power to connected equipment for a defined period following failure of
260 power supply and distribution equipment
261 3.1.19
262 primary distribution equipment
263 equipment which is required to manage, control and convert incoming power supplies (primary,
264 secondary and, where appropriate, additional) in a form suitable for distribution by secondary distribution
265 equipment
266 3.1.20
267 primary supply
268 principal power supply that provides power to the data centre under normal operating conditions
269 3.1.21
270 resistive load
271 load in which the alternating current is in phase with the voltage
272 Note 1 to entry: The total reactance is zero.
273 3.1.22
274 secondary distribution equipment
275 equipment which is required to manage, control and distribute the power provided by the primary
276 distribution equipment to the short-break and unprotected sockets within the data centre and to the
277 tertiary distribution equipment
278 Note 1 to entry: The power supply may be single-phase AC, three-phase AC or DC. If there is a change from 3-phase to 1-phase
279 supply, this is generally achieved at the secondary distribution equipment that is served directly from the primary distribution
280 equipment.
281 3.1.23
282 secondary supply
283 power supply that provides power to the data centre in conjunction with the primary supply under normal
284 operating conditions
285 3.1.24
286 short-break supply provision
287 back-up supported supply provision
288 sockets which, upon failure of power supply and distribution equipment, will be provided with power from
289 an additional power supply after a defined period

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290 3.1.25
291 tertiary distribution equipment
292 power supply equipment, typically accommodated within the cabinets, frames and racks of the data
293 centre spaces, which directly feeds the protected sockets therein
294 3.1.26
295 total harmonic current distortion
296 THCD
297 measurement of the harmonic distortion present, defined as the ratio of the sum of the powers of all
298 harmonic components to the power of the fundamental frequency
299 3.1.27
300 total harmonic voltage distortion
301 THVD
302 measurement of the harmonic distortion present, defined as the ratio of the sum of the powers of all
303 harmonic components to the power of the fundamental frequency
304 3.1.28
305 unprotected supply provision
306 sockets which fail to deliver power to connected equipment following failure in power supply and
307 distribution equipment
308 3.2 Abbreviations
309 For the purposes of this document, the abbreviations given in FprEN 50600-1:2012 and the following
310 apply.
311 AC Alternating Current
312 DC, dc Direct Current
313 ESD ElectroStatic Discharge
314 EPO Emergency Power Off
315 HV High Voltage
316 kVA kilovolt ampere
317 kWh kilowatt hour
318 LV Low Voltage
319 MV Medium Voltage
320 r.m.s. root mean square
321 SPD Surge Protective Device
322 THCD Total Harmonic Current Distortion
323 THVD Total Harmonic Voltage Distortion
324 TVSS Transient Voltage Surge Suppression
325 UPS Uninterruptible Power Supply

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326 4 Power supply and distribution within data centres
327 4.1 General
328 The distribution of electrical power is one of the most important aspects of data centre infrastructure.
329 Disturbances of power supply voltage, current and frequency have a direct affect on the operational
330 safety of the data centre infrastructure and its availability.
331 The functional elements of power supply to and distribution within data centres are described in Table 1.
332 The requirements and recommendations for the provision of physical security to the spaces
333 accommodating the functional elements are described in Clause 6.
334 The primary and secondary supplies are typically provided from a transformer which may either be:
335 a) within the premises containing the data centre (and may be owned by either the utility or the data
336 centre premises owner) or
337 b) external and owned by the utility (if it is inside the premises it is considered to be a functional
338 element).
339 The primary and secondary distribution equipment may also contain transformers.
340 Figure 2 indicates two implementations. The upper diagram shows the minimum implementation
341 comprising a primary power supply only. The lower diagram shows an additional supply that provides
342 power to relevant equipment in the data centre, if re
...