EN 50174-2:2009

SLOVENSKI STANDARD
01-oktober-2009
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SIST EN 50174-2:2001
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Information technology - Cabling installation -- Part 2: Installation planning and practices
inside buildings
Informationstechnik - Installation von Kommunikationsverkabelung -- Teil 2:
Installationsplanung und Installationspraktiken in Gebäuden
Technologies de l'information - Installation de câblages -- Partie 2: Planification et
pratiques d'installation à l'intérieur des bâtiments
Ta slovenski standard je istoveten z: EN 50174-2:2009
ICS:
33.040.50 Vodi, zveze in tokokrogi Lines, connections and
circuits
35.110 Omreževanje Networking
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 50174-2
NORME EUROPÉENNE
May 2009
EUROPÄISCHE NORM
ICS 35.110; 91.140.50 Supersedes EN 50174-2:2000

English version
Information technology -
Cabling installation -
Part 2: Installation planning and practices inside buildings

Technologies de l'information -  Informationstechnik -
Installation de câblages - Installation
Partie 2: Planification et pratiques von Kommunikationsverkabelung -
d'installation à l'intérieur des bâtiments Teil 2: Installationsplanung
und Installationspraktiken in Gebäuden

This European Standard was approved by CENELEC on 2009-05-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

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

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

Central Secretariat: Avenue Marnix 17, B - 1000 Brussels

© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50174-2:2009 E
Foreword
This European Standard was prepared by the Technical Committee CENELEC TC 215, Electrotechnical
aspects of telecommunication equipment.
The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50174-2 on
2009-05-01.
This European Standard supersedes EN 50174-2:2000.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2010-05-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2012-05-01
EN 50174 comprises three parts. All three parts support the specification, implementation and operation of
information technology cabling. There are specific requirements for cabling systems that are in accordance
with the design requirements of the EN 50173 series. However, the three parts also apply to cabling systems
of any design including those in accordance with standards such as EN 50098-1 or EN 50098-2.
This part, EN 50174-2, is concerned with the planning and installation of information technology cabling
using metallic cabling and optical fibre cabling inside buildings. It provides guidance as to the responsibilities
of those involved and is intended to be referenced in relevant contracts.
Additional clauses containing normative requirements for specific types of premises will be added as
amendments, or as revisions, to this standard. At the time of publication of this European Standard, the
following clauses are planned:
– homes;
– data centres;
– operator buildings.
It does not cover those aspects of installation associated with the transmission of signals in free space
between transmitters, receivers or their associated antenna systems (e.g. wireless, radio, microwave or
satellite).
This document contains two informative annexes:
– Annex A, providing information on EMC and protection;
– Annex B, containing a minimum set of responsibilities applicable to installers and enabling national-
specific amendment to define other responsibilities.
__________
– 3 – EN 50174-2:2009
Contents
Introduction . 6
1 Scope and conformance . 9
1.1 Scope . 9
1.2 Conform ance . 9
2 Normative references . 10
3 Terms, definitions and abbreviations . 12
3.1 Terms and definitions . 12
3.2 Abbreviations . 14
4 Requirements for planning installations of information technology cabling . 15
4.1 Safety . 15
4.2 Documentation . 16
4.3 Pathways . 16
4.4 Pathway systems . 17
4.5 Cable management systems . 18
4.6 Closures . 20
4.7 Cabling . 20
5 Requirements for the installation of information technology cabling . 21
5.1 Safety . 21
5.2 Documentation . 22
5.3 Installation practice . 22
5.4 Surge protective devices . 28
5.5 Labelling . 28
5.6 Testing. 28
5.7 Contractual acceptance . 29
6 Segregation of metallic information technology cabling and mains power cabling. 29
6.1 General. 29
6.2 Requirements . 29
6.3 Recommendations . 36
7 Electricity distribution systems and lightning protection . 37
7.1 Electricity distribution systems . 37
7.2 Protection against lightning and induced overvoltages . 38
8 Office (commercial) premises . 39
8.1 General. 39
8.2 Office (commercial) premises cabling design overview . 39
8.3 Requirements for planning installations of information technology cabling . 40
8.4 Requirements for installers of information technology cabling . 40
8.5 Segregation of metallic information technology cabling and mains power cabling . 40

9 Industrial premises . 40
9.1 General. 40
9.2 Industrial premises cabling design overview . 40
9.3 Requirements for planning installations of information technology cabling . 41
9.4 Requirements for installers of information technology cabling . 42
9.5 Segregation of metallic information technology cabling and mains power cabling . 43
Annex A (informative) EMC and protection . 44
A.1 Coupling mechanisms and countermeasures . 44
A.2 The EMC concept . 47
A.3 Filtering and electrical isolation components and surge protective devices . 51
Annex B (informative) Application of responsibilities . 57
Bibliography . 60
Figures
Figure 1 – Schematic relationship between the EN 50174 series and other relevant standards . 7
Figure 2 – Cable arrangement in a metallic section . 20
Figure 3 – Continuity of metallic cable management systems . 24
Figure 4 – Interruption of metallic cable management systems at fire barriers . 24
Figure 5 – Flowchart for cable separation calculation . 32
Figure 6 – Separation of mains power and information technology cables without dividers . 33
Figure 7 – Separation of mains power and information technology cables with dividers . 34
Figure 8 – Separation of cables in pathway systems . 35
Figure 9 – Structure of generic cabling in industrial premises . 41
Figure 10 – Configuration of apparatus-based functional elements within industrial premises . 41
Figure A.1 – Screened cables reduce capacitive coupling . 44
Figure A.2 – Electrical field to cable, capacitive coupling example . 46
Figure A.3 – Magnetic field to loop, inductive coupling example . 46
Figure A.4 – Magnetic field . 47
Figure A.5 – Earthing arrangement . 47
Figure A.6 – Earthing and bonding of filters . 52
Figure A.7 – Mounting of filters . 53
Figure A.8 – Installation of power filter . 53
Figure A.9 – Installation guidelines for transformers . 55
Figure A.10 – Installation guidelines for optocouplers . 55
Figure A.11 – Short connections of surge protective devices . 56

– 5 – EN 50174-2:2009
Tables
Table 1 – Contextual relationship between EN 50174 series and other standards relevant for information
technology cabling systems . 8
Table 2 – Stacking height for typical distances L . 18
Table 3 – Classification of information technology cables . 30
Table 4 – Minimum separation S . 31
Table 5 – Power cabling factor . 31
Table 6 – Separation requirements between metallic cabling and specific EMI sources . 36
Table A.1 – EMC checklist . 48
Table A.2 – Actions resulting from the answers of Table A.1 . 49
Table B.1 – Responsibilities template . 58
Table B.2 – Example of completed responsibilities . 59

Introduction
The importance of services delivered by information technology cabling infrastructure is similar to that of
utilities such as heating, lighting and electricity supplies. As with those utilities, interruptions to service can
have a serious impact. Poor quality of service due to lack of planning, use of inappropriate components,
incorrect installation, poor administration or inadequate support can threaten an organisation’s effectiveness.
There are four phases in the successful implementation of information technology cabling. These are:
a) design;
b) specification – the detailed requirement for the cabling, including the planning of its accommodation and
associated building services addressing specific environments (e.g. electromagnetic) together with the
quality assurance requirements to be applied;
c) installation – in accordance with the requirements of the specification;
d) operation – the management of connectivity and the maintenance of transmission performance during
the life of the cabling.
This European Standard is in three parts and addresses the specification, installation and operational
aspects. The EN 50173 series and other application standards cover design issues.
EN 50174-1 is used during the specification phase. It addresses the:
– installation specification, quality assurance documentation and procedures;
– documentation and administration;
– operation and maintenance.
This part, EN 50174-2, and EN 50174-3 are intended to be used by the personnel directly involved in the
planning aspects (of the specification phase) and installation phase. EN 50174-2 is applicable inside
buildings and EN 50174-3 is applicable outside buildings.
This European Standard is also relevant to:
• architects, building designers and builders;
• main contractors;
• designers, suppliers, installers, inspectors (auditors), maintainers and owners of information technology
cabling;
• public network providers and local service providers;
• end users.
This part, EN 50174-2, contains requirements and recommendations relating to the installation planning and
practices by defining:
i) planning strategy (road map) and guidance depending on the application, electromagnetic environment,
building infrastructure and facilities, etc.;
ii) planning and installation requirements for metallic and optical fibre information technology cabling
depending on the application, electromagnetic environment, building infrastructure and facilities, etc.;
iii) the practices and procedures to be adopted to ensure that the cabling is installed in accordance with the
specification.
– 7 – EN 50174-2:2009
Figure 1 and Table 1 show the schematic and contextual relationships between the standards produced by
CLC/TC 215 for information technology cabling, namely:
1) this and other parts of the EN 50174 series;
2) generic cabling design (EN 50173 series);
3) application dependent cabling design (e.g. EN 50098 series);
4) testing of installed cabling (EN 50346);
5) equipotential bonding requirements (EN 50310).

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IISSDDNN bas basicic ac accceessss
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ccaabblliinng fg foorr i innffoorrmmaattiioon tn teecchnohnollooggyy - -
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EENN 503 50310:10: AApplippliccaattiioon ofn of e eqquuiipopottententiiaall
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TTeessttiinng ofg of i innssttallalleed cd caabbllinging

Figure 1 – Schematic relationship between the EN 50174 series
and other relevant standards
Table 1 – Contextual relationship between EN 50174 series and other standards
relevant for information technology cabling systems
Building design phase Generic cabling Specification phase Installation phase Operation phase
design phase
EN 50310 EN 50173 series EN 50174-1 EN 50174-1
except
EN 50173-4
5.2: Common bonding 4: Structure 4: Requirements for 4: Requirements for
network (CBN) within a specifying installations specifying installations
5: Channel performance
building of information of information
technology cabling technology cabling
7: Cable requirements
6.3: AC distribution
system and bonding of 5: Requirements for
8: Connecting hardware
the protective conductor installers of information
requirements
(TN-S) technology cabling
9: Requirements for
cords and jumpers
A: Link performance
limits
Planning phase
and
EN 50173-4 EN 50174-2 EN 50174-2
4 and 5: Structure 4: Requirements for 5: Requirements for the
planning installations of installation of
6: Channel performance
information technology information technology
cabling cabling
8: Cable requirements
6: Segregation of 6: Segregation of
9: Connecting hardware
metallic information metallic information
requirements
technology cabling and technology cabling and
10: Requirements for
mains power cabling mains power cabling
cords and jumpers
7: Electricity distribution
A: Link performance systems and lightning
limits protection
and and
EN 50174-3 EN 50174-3
and and
(for equipotential (for equipotential
bonding) bonding)
EN 50310 EN 50310
5.2: Common bonding 5.2: Common bonding
network (CBN) within a network (CBN) within a
building building
6.3: AC distribution 6.3: AC distribution
system and bonding of system and bonding of
the protective conductor the protective conductor
(TN-S) (TN-S)
and
EN 50346
4: General requirements
5: Test parameters for
balanced cabling
6: Test parameters for
optical fibre cabling
– 9 – EN 50174-2:2009
1 Scope and conformance
1.1 Scope
This European Standard specifies requirements for the following aspects of information technology cabling:
a) planning;
b) installation practice.
This European Standard is applicable to all types of information technology cabling inside buildings (and may
be applied to cabling that is defined as part of the building) including generic cabling systems designed in
accordance with the EN 50173 series. The requirements of Clauses 4, 5 and 6 of this standard are
premises-independent unless amended by the requirements of premises-specific clauses.
This European Standard:
1) details the considerations for satisfactory installation and operation of information technology cabling;
2) excludes specific requirements applicable to other cabling systems (e.g. mains power cabling); however,
it takes account of the effects other cabling systems may have on the installation of information
technology cabling (and vice versa) and gives general advice;
3) excludes those aspects of installation associated with the transmission of signals in free space between
transmitters, receivers or their associated antenna systems (e.g. wireless, radio, microwave or satellite).
This European Standard is intended for application within commercial and residential premises.
This standard is applicable to certain hazardous environments but does not exclude additional requirements
which are applicable in particular circumstances, defined by e.g. electricity supply and electrified railways.
1.2 Conformance
For a cabling installation to conform to this European Standard:
a) the planning of the installation shall meet the requirements of Clause 4;
b) the installation practices shall meet the requirements of Clause 5;
c) the additional requirements of the applicable premises-specific clause shall be met;
d) the equipotential bonding system within the premises shall be in accordance with EN 50310;
e) where a lightning protection system is required, it shall conform to the “integrated lightning protection
system" according to EN 62305-4;
f) other lightning protection systems, including the “isolated lightning protection system” according to
EN 62305-3 are allowed provided that specific restrictions are applied both to the implementation of the
information technology cabling and the requirements of EN 50310 as agreed between the planners of the
lightning protection system and the information technology cabling;
g) local regulations, including safety, shall be met.
The responsibilities for specific elements of conformance may be made by national-specific amendment of
Annex B.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
CLC/TR 50450:2006, Resistibility requirements for equipment having (a) telecommunication port(s)
EN 50085-1, Cable trunking systems and cable ducting systems for electrical installations – Part 1: General
requirements
EN 50085-2 (series), Cable trunking systems and cable ducting systems for electrical installations
EN 50173-1:2007, Information technology – Generic cabling systems – Part 1: General requirements
EN 50173-2, Information technology – Generic cabling systems – Part 2: Office premises
EN 50173-3:2007, Information technology – Generic cabling systems – Part 3: Industrial premises
EN 50173-4, Information technology – Generic cabling systems – Part 4: Homes
EN 50173-5, Information technology – Generic cabling systems – Part 5: Data centres
EN 50174-1:2009, Information technology – Cabling installation – Part 1: Installation specification and quality
assurance
EN 50174-3, Information technology – Cabling installation – Part 3: Installation planning and practices
outside buildings
EN 50288 series, Multi-element metallic cables used in analogue and digital communication and control
EN 50310, Application of equipotential bonding and earthing in buildings with information technology
equipment
EN 50346, Information technology – Cabling installation – Testing of installed cabling
EN 60079-0, Electrical apparatus for explosive gas atmospheres – Part 0: General requirements
(IEC 60079-0:2004, mod.)
EN 60079-14, Explosive atmospheres – Part 14: Electrical installations design, selection and erection
(IEC 60079-14)
EN 60079-17, Explosive atmospheres -- Part 17: Electrical installations inspection and maintenance
(IEC 60079-17)
EN 60332-1-2, Tests on electric and optical fibre cables under fire conditions – Part 1-2: Test for vertical
flame propagation for a single insulated wire or cable – Procedure for 1 kW pre-mixed flame (IEC 60332-1-2)
EN 60529, Degrees of protection provided by enclosures (IP code) (IEC 60529)
EN 60825 (series), Safety of laser products (IEC 60825 series)
EN 60950 (series), Information technology equipment – Safety (IEC 60950 series, mod.)
EN 61000-6-1, Electromagnetic compatibility (EMC) – Part 6-1: Generic standards – Immunity for residential,
commercial and light-industrial environments (IEC 61000-6-1)
EN 61000-6-2, Electromagnetic compatibility (EMC) – Part 6-2: Generic standards – Immunity for industrial
environments (IEC 61000-6-2)
EN 61000-6-3, Electromagnetic compatibility (EMC) – Part 6-3: Generic standards – Emission standard for
residential, commercial and light-industrial environments (IEC 61000-6-3)

– 11 – EN 50174-2:2009
EN 61000-6-4, Electromagnetic compatibility (EMC) – Part 6-4: Generic standards – Emission standard for
industrial environments (IEC 61000-6-4)
EN 61241-14, Electrical apparatus for use in the presence of combustible dust – Part 14: Selection and
installation (IEC 61241-14)
EN 61386-1, Conduit systems for cable management – Part 1: General requirements (IEC 61386-1)
EN 61386-2X (series), Conduit systems for cable management – Part 2X: Particular requirements
(IEC 61386-2X series)
EN 61534 (series), Powertrack systems (IEC 61534 series)
EN 61537, Cable management – Cable tray systems and cable ladder systems (IEC 61537)
EN 61558-1, Safety of power transformers, power supplies, reactors and similar products – Part 1: General
requirements and tests (IEC 61558-1)
EN 61643 (series), Low voltage surge protective devices (IEC 61643 series, mod.)
EN 61784-1, Industrial communication networks – Profiles – Part 1: Fieldbus profiles (IEC 61784-1)
EN 61784-2, Industrial communication networks – Profiles – Part 2: Additional fieldbus profiles for realtime
networks based on ISO/IEC 8802-3 (IEC 61784-2)
EN 61784-3, Industrial communication networks – Profiles – Part 3: Functional safety fieldbuses – General
rules and profile definitions (IEC 61784-3)
EN 61784-3-1, Industrial communication networks – Profiles – Part 3-1: Functional safety fieldbuses –
Additional specifications for CPF 1 (IEC 61784-3-1)
EN 61784-5-2, Industrial communication networks – Profiles – Part 5-2: Installation of fieldbuses –
Installation profiles for CPF 2 (IEC 61784-5-2)
EN 61784-5-3, Industrial communication networks – Profiles – Part 5-3: Installation of fieldbuses –
Installation profiles for CPF 3 (IEC 61784-5-3)
EN 61918, Industrial communication networks – Installation of communication networks in industrial
premises (IEC 61918:2007, mod.)
EN 62305-2, Protection against lightning – Part 2: Risk management (IEC 62305-2)
EN 62305-4, Protection against lightning – Part 4: Electrical and electronic systems within structures
(IEC 62305-4)
HD 384/HD 60364 (series), Low-voltage electrical installations (IEC 60364 series, mod.)
HD 60364-1:2008, Low-voltage electrical installations –Part 1: Fundamental principles, assessment of
general characteristics, definitions (IEC 60364-1:2005, mod.)
HD 60364-4-41:2007, Low-voltage electrical installations – Part 4-41: Protection for safety – Protection
against electric shock (IEC 60364-4-41:2005, mod.)
HD 384.4.442 S1:1997, Electrical installations of buildings – Part 4: Protection for safety – Chapter 44:
Protection against overvoltages – Section 442: Protection of low-voltage installations against faults between
high-voltage systems and earth
HD 60364-4-443, Electrical installations of buildings – Part 4-44: Protection for safety – Protection against
voltage disturbances and electromagnetic disturbances – Clause 443: Protection against overvoltages of
atmospheric origin or due to switching (IEC 60364-4-44:2001/A1:2003, mod.)

HD 384.5/HD 60364-5 (series), Electrical installation of buildings – Part 5: Selection and erection of electrical
equipment (IEC 60364-5 series, mod.)
HD 384.5.52 S1:1995, Electrical installations of buildings – Part 5: Selection and erection of electrical
equipment – Chapter 52: Wiring systems (IEC 60364-5-52:1993, mod.)
HD 60364-5-534, Low-voltage electrical installations – Part 5-53: Selection and erection of electrical
equipment – Isolation, switching and control – Clause 534: Devices for protection against overvoltages
(IEC 60364-5-53:2001/A1:2002 (Clause 534), mod.)
HD 60364-5-54, Low-voltage electrical installations – Part 5-54: Selection and erection of electrical
equipment – Earthing arrangements, protective conductors and protective bonding conductors
(IEC 60364-5-54:2002, mod.)
EN 300 253:2002, Equipment Engineering (EE) – Earthing and bonding of telecommunication equipment in
telecommunication centres
IEC 60050-195:1998, International Electrotechnical Vocabulary (IEV) – Part 195: Earthing and protection
against electric shock
IEC 60050-826:2004, International Electrotechnical Vocabulary (IEV) – Part 826: Electrical installations
IEC/TR 61000-5 (series), Electromagnetic compatibility (EMC) – Part 5: Installation and mitigation guidelines
IEC/TR 61000-5-2, Electromagnetic compatibility (EMC) – Part 5: Installation and mitigation guidelines –
Section 2: Earthing and cabling
IEC/TR 61000-5-3, Electromagnetic compatibility (EMC) – Part 5-3: Installation and mitigation guidelines –
HEMP protection concepts
1)
IEC 61784-4 , Industrial Communications – Fieldbus Profile – Part 4: Profiles for secure communications in
industrial networks
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 50174-1 and the following apply.
Where the cabling is designed in accordance with standards in the EN 50173 series, the additional
definitions of those standards are applicable.
NOTE The definitions with respect to earthing and bonding are taken from series IEC 60050 and EN 300 253:2002; reference to these
standards is indicated in square brackets.
3.1.1
bonding network
set of interconnected conductive structures that provides an „electromagnetic shield“ for electronic systems
and personnel at frequencies from direct current (DC) to low radio frequency (RF)
NOTE The term „electromagnetic shield“ denotes any structure used to divert, block or impede the passage of electromagnetic energy.
In general, a bonding network need not be connected to earth but all bonding networks (BNs) considered in the present document will
have an earth connection.
[EN 300 253:2002, 3.1.2]
3.1.2
common bonding network
principal means for effective bonding and earthing inside a building with information technology equipment
———————
1)
In preparation.
– 13 – EN 50174-2:2009
NOTE It is the set of metallic components that are intentionally or incidentally interconnected to form the principal BN in a building.
These components include: structural steel or reinforcing rods, metallic plumbing, alternating current (AC) power conduit, protective
conductors (PE), cable racks and bonding conductors. The CBN is connected to the earthing network.
[EN 300 253:2002, 3.1.2, modified]
3.1.3
earth electrode
conductive part, which may be embedded in the soil or in a specific conductive medium, e.g. concrete or
coke, in electric contact with earth
[IEC 60050-826:2004, 826-13-05; IEC 60050-195:1998, 195-02-01, modified]
3.1.4
earthing conductor
conductor which provides a conductive path, or part of the conductive path, between a given point in a
system or in an installation or in equipment and an earth electrode or an earth-electrode network
[IEC 60050-826:2004, 826-13-12; IEC 60050-195:1998, 195-02-03, modified]
3.1.5
equipotential bonding
provisions of electric connections between conductive parts, intended to achieve equipotentiality
[IEC 60050-826:2004, 826-13-19; IEC 60050-195:1998, 195-01-10]
3.1.6
functional earthing conductor
conductors that are only used for functional earthing (not protection)
3.1.7
high-voltage
voltage over AC 1 000 V r.m.s. or DC 1 500 V
3.1.8
isolated bonding network
bonding network that has a single point of connection to either the common bonding network or another
isolated bonding network
NOTE All isolated bonding networks considered here will have a connection to earth through the single point of connection.
3.1.9
meshed bonding network
bonding network in which all associated equipment frames, racks and cabinets and usually the DC power
return conductors are bonded together as well as at multiple points to the common bonding network (CBN)
NOTE Consequently, the meshed BN augments the CBN.
3.1.10
metallic information technology cable/cabling
cables (cabling) utilising metallic conductors for signal transmission
3.1.11
parallel earthing conductor
earthing conductor that is parallel to the mains power cable or information technology cable
3.1.12
PEN conductor
conductor combining the functions of both a protective earthing conductor and a neutral conductor
[IEC 60050-826:2004, 826-13-25; IEC 60050-195:1998, 195-02-12]

3.1.13
protective (earth) conductor
conductor provided for purposes of safety, for example protection against electric shock
[IEC 60050-826:2004, 826-13-22; IEC 60050-195:1998, 195-02-09]
3.1.14
resistibility
ability of telecommunication equipment or any network to withstand the effects of certain physical
phenomena up to a certain, specified extent and according to a specific criterion
[CLC/TR 50450:2006, 3.1.2]
3.1.15
segregation
the use of earthed electrically conductive barriers or physical separation to prevent electromagnetic
interference between external noise sources, including mains power cabling, and information technology
cabling
3.1.16
surge protective device
a device intended to protect the electrical apparatus from high transient over-voltages and to limit the
duration and frequently the amplitude of the follow-on current
NOTE The device contains at least one non-linear component.
3.2 Abbreviations
For the purposes of this document, the abbreviations given in EN 50174-1 and the following apply.
Where the cabling is designed in accordance with standards in the EN 50173 series, the additional
abbreviations of those standards are applicable.
AC alternating current
BN bonding network
CATV cabled distribution television
CBN common bonding network
CSA cross-sectional area
DC direct current
EMC electromagnetic compatibility
EMI electromagnetic interference
ffs for further study
HVAC heating, ventilation and air conditioning
IBN isolated bonding network
N neutral conductor
PE protective (earth) conductor
PEC parallel earthing conductor
PEN conductor combining the functions of both a protective conductor and a neutral conductor

– 15 – EN 50174-2:2009
SELV safety extra-low voltage
SPD surge protective device
TCL transverse conversion loss
TNV telecommunication network voltage
4 Requirements for planning installations of information technology cabling
4.1 Safety
4.1.1 Personnel
Internal procedures, in accordance with local regulations, shall be in place to ensure that all persons visiting
the premises are aware of:
a) the locations and boundaries of hazardous areas;
b) the procedures to be adopted when working in or in proximity to these hazardous areas;
c) fire precautions;
d) escape routes.
4.1.2 Mains power cabling
The proper implementation of the requirements of this standard require that electrical installations are
undertaken in accordance with the HD 384/HD 60364 series and/or local regulations as appropriate.
4.1.3 Optical fibre cabling
The hazard classification of areas containing optical fibre information technology equipment and optical fibre
information technology cabling shall be undertaken in accordance with EN 60825-2 in order to define
appropriate installation and labelling practices.
4.1.4 Transmission and terminal equipment
Information technology cabling shall be connected to equipment that incorporates safe signal circuitry
complying with the SELV circuit and the TNV requirements as defined in the EN 60950 series.
Equipment connected shall comply with the protection requirements against electric shock of the relevant
product safety standards.
The connection of active equipment to information technology cabling shall not introduce hazards for other
users of the system.
4.1.5 Cells and batteries
If cells and batteries that produce explosive gases (e.g. lead-acid batteries that produce hydrogen and
oxygen) are to be installed, provision shall be made for the necessary ventilation and recommended
environmental conditions (see HD 60364-5-54). Local regulations shall be complied with.
4.1.6 Cable management systems
The selection of cable management systems shall enable the installation of fire barriers, if required.
4.1.7 Closures
NOTE The following requirements apply unless specifically allowed otherwise by local regulations.

Closures and combined terminal and distribution devices (fittings) providing facilities for the termination or
(and) distribution of both information technology cables and mains power cables shall be designed to provide
separate covers for the two cabling types.
Alternatively, a single overall cover is allowed provided that the mains power cabling remains protected to
prevent electric shock after removal of the cover. This applies for example to a closure containing separate
termination points for information technology and mains power cabling, but not for termination points where
the network power supply is provided within the information technology cabling termination points itself.
Where both information technology cabling and mains power cabling are contained within a closure then:
a) if the closure is metallic, it shall be provided with a protective earth in accordance with 4.1.2;
b) the compartment in the closure shall have a barrier (either conducting or non-conducting) between the
two cable types. If compartment barriers are conductive, they shall be earthed in accordance with the
relevant local regulations for protective earth;
c) the front plates on the closure shall allow separate access to the information technology cabling and the
mains power cabling and shall be retained such that the use of a tool is necessary to gain access
thereby preventing inadvertent misconnection between the mains power and the information technology
cabling;
d) the entry plates for the information technology cables and the mains power cables shall be separately
remov
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