EN 60728-11:2005

SLOVENSKI SIST EN 60728-11:2006

STANDARD
januar 2006
Kabelska omrežja za televizijske in zvokovne signale ter interaktivne storitve –
11. del: Varnost (IEC 60728-11:2005, spremenjen)
(istoveten EN 60728-11:2005)
Cable networks for television signals, sound signals and interactive services - Part
11: Safety (IEC 60728-11:2005, modified)
ICS 33.060.40 Referenčna številka
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

EUROPEAN STANDARD EN 60728-11
NORME EUROPÉENNE
EUROPÄISCHE NORM May 2005
ICS 33.060.40 Supersedes EN 50083-1:1993 + A1:1997 + A2:1997

English version
Cable networks for television signals,
sound signals and interactive services
Part 11: Safety
(IEC 60728-11:2005, modified)
Réseaux de distribution par câbles  Kabelnetze für Fernsehsignale,
pour signaux de télévision, signaux Tonsignale und interaktive Dienste
de radiodiffusion sonore et services Teil 11: Sicherheitsanforderungen
interactifs (IEC 60728-11:2005, modifiziert)
Partie 11: Sécurité
(CEI 60728-11:2005, modifiée)
This European Standard was approved by CENELEC on 2005-04-01. 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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.

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

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60728-11:2005 E
Foreword
The text of documents 100/847A/FDIS + 100/847B/FDIS, future edition 2 of IEC 60728-11, prepared
by Technical Area 5: Cable networks for television signals, sound signals and interactive services, of
IEC TC 100, Audio, video and multimedia systems and equipment, was submitted to the
IEC-CENELEC parallel vote.
Together with a common modification, prepared by the Technical Committee CENELEC TC 209, Cable
networks for television signals, sound signals and interactive services, it was approved by CENELEC as
EN 60728-11 on 2005-04-01.
This European Standard supersedes EN 50083-1:1993 + A1:1997 + A2:1997 + corrigenda Jul. 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) 2006-01-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2008-04-01
Annexes ZA, ZB and ZC have been added by CENELEC.
__________
- 3 - EN 60728-11:2005
Endorsement notice
The text of the International Standard IEC 60728-11:2005 was approved by CENELEC as a European
Standard with agreed common modifications as given below.
COMMON MODIFICATIONS
Contents
Add:
Annex ZA (normative) Special national conditions
Annex ZB (informative) A-deviations
Annex ZC (normative) Normative references to international publications with their corresponding
European publications
Annex B
B.1 Justification
Replace by:
B.1 Introduction
A.C. power distribution systems using IT-network technology are equipped with a line-to-line voltage of
230 V (see Figure B.1). Such IT-networks have no N-conductor, and the a.c. mains power is supplied
to the equipment from two of the three line conductors (EN 60950-1, Annex V).
For a cable network covering an area with this type of IT power supply network, special initiative
should be taken to ensure that the safety in the cable network is maintained. The following
equipotential bonding arrangements described will provide necessary safety in such a network.
NOTE See also Annex ZA.
Bibliography
Replace the reference to IEC 60728-2:2002 by:
EN 50083-2:2001, Cable networks for television signals, sound signals and interactive services –
Part 2: Electromagnetic compatibility for equipment

Add the following annexes:
Annex ZA
(normative)
Special national conditions
Special national condition: National characteristic or practice that cannot be changed even over a
long period, e.g. climatic conditions, electrical earthing conditions.
NOTE  If it affects harmonization, it forms part of the European Standard.
For the countries in which the relevant special national conditions apply these provisions are
normative, for other countries they are informative.
Clause Special national condition
6 Norway
In most parts of Norway the AC power distribution systems are built as IT networks with a
line-to-line voltage of 230 V. In these cases the equipotential bonding within a cable
network has to be performed according to Annex B of this standard.
In parts of Norway where the power distribution systems are built as TN-networks, these
special national conditions can be disregarded and the equipotential bonding shall be
performed according to Clause 6 of this standard.
11.2.2 Finland
As the conductivity of earth in Finland is lower than what is normal in many other
countries, the earthing electrodes in 11.2.2 should be as shown in Figures 16 a), 16 b) or
16 c).
12.3 Finland
The required wind pressure value is 700 N/m for buildings up to 30 m.
__________
- 5 - EN 60728-11:2005
Annex ZB
(informative)
A-deviations
A-deviation: National deviation due to regulations, the alteration of which is for the time being outside
the competence of the CENELEC national member.
This European Standard falls under Directive 73/23/EEC.
NOTE (from CEN/CENELEC IR Part 2:2002 , 2.17)  Where standards fall under EC Directives, it is the view of the Commission
of the European Communities (OJ No C 59, 1982-03-09) that the effect of the decision of the Court of Justice in case 815/79
Cremonini/Vrankovich (European Court Reports 1980, p. 3583) is that compliance with A-deviations is no longer mandatory and
that the free movement of products complying with such a standard should not be restricted except under the safeguard
procedure provided for in the relevant Directive.
A-deviations in an EFTA-country are valid instead of the relevant provisions of the European Standard
in that country until they have been removed.
Clause Deviation
9 France
(Arrêté interministériel, 2 April 1991)
This regulation specifies, among many other parameters, the minimum distance between
electric supply wires (isolated and not isolated, low-voltage and high-voltage) and any
other installation (e.g. buildings, antennas, telecommunication lines, etc.).
The main clauses of this regulation which concern the cable networks are Clauses 12, 25,
26, 33, 33bis, 38, 49, 51, 52 and 63.
Clause 9 of this standard specifies distances of 10 mm (indoors) and 20 mm (outdoors)
and this is not sufficient to cover overhead cables. As an example, the minimum distance
between an overhead telecommunication line and an overhead low-voltage (up to 1 kV)
electricity supply line shall be 1 m (Clause 33). This distance may be reduced under
specified conditions (Clauses 51, 52 and 63).
This regulation specifies also the minimum distance from high-voltage lines. This distance
varies from 1 m to 4 m depending on the voltage, on the isolation of the cable and on the
location (built-up area or not) (Clauses 33 and 63)
11 France
(NF C 15100 - Décret n° 84-74 du 26 janvier 1984 modifié)
The use of TT distribution systems with 300 mA differential switching is not compatible
with the interconnection of the earthing of two different buildings.

__________
Annex ZC
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE Where an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
- - Coaxial cables EN 50117-1 Series
Part 1: Generic specification
IEC 60065 (mod) 2001 Audio, video and similar electronic EN 60065 2002
apparatus - Safety requirements

IEC 60364 Series Electrical installations of buildings HD 384 Series
HD 60364
IEC 60529 1989 Degrees of protection provided by EN 60529 1991
enclosures (IP Code) + corr. May 1993
A1 1999 A1 2000
IEC 60825-1 1993 Safety of laser products EN 60825-1 1994
A1 1997 Part 1: Equipment classification, A1 2002
A2 2001 requirements and user's guide A2 2001

1)
IEC 60825-2 2000 Part 2: Safety of optical fibre EN 60825-2 2000
communication systems
IEC 60950-1 2001 Information technology equipment - EN 60950-1 2001
(mod) Safety + A11 2004
Part 1: General requirements + corr. April 2004

IEC 61024-1 1990 Protection of structures against lightning - -
Part 1: General principles
ISO 3864-1 2002 Graphical symbols - Safety colours and - -
safety signs
Part 1: Design principles for safety signs
in workplaces and public areas

1)
EN 60825-2 is superseded by EN 60825-2:2004 which is based on IEC 60825-2:2004.

INTERNATIONAL IEC
STANDARD 60728-11
Second edition
2005-01
Cable networks for television signals,
sound signals and interactive services –
Part 11:
Safety
 IEC 2005  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale
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International Electrotechnical Commission
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For price, see current catalogue

– 2 – 60728-11  IEC:2005(E)
CONTENTS
FOREWORD .5
1 Scope .10
2 Normative references .10
3 Terms, definitions, symbols and abbreviations .11
3.1 Terms and definitions .11
3.2 Symbols .15
3.3 Abbreviations .15
4 General requirements.15
4.1 General .15
4.2 Mechanical requirements.16
4.3 Accessible parts .16
4.4 Laser radiation .16
5 Protection against environmental influences .16
6 Equipotential bonding and earthing.16
6.1 General requirements .16
6.2 Equipotential bonding mechanisms .17
6.3 Equipotential bonding in meshed systems.18
6.3.1 References to other standards .18
6.3.2 General on a.c. mains.18
6.3.3 AC power distribution and connection of the protective conductor.18
6.3.4 Dangers and malfunction .19
6.3.5 Measures.19
7 Mains-supplied equipment .19
8 Remote power feeding in cable networks .20
8.1 Remote power feeding.20
8.1.1 Maximum allowed voltages .20
8.1.2 General provisions for equipment.20
8.1.3 Current-carrying capacity and dielectric strength of the components.20
8.2 Remote powering from subscriber premises.21
9 Protection against contact and proximity to electric power distribution systems .21
9.1 General .21
9.2 Overhead lines .21
9.2.1 Overhead lines up to 1 000 V .21
9.2.2 Overhead lines above 1 000 V .21
9.3 House installations up to 1 000 V.21
10 System outlets and transfer points .22
10.1 General .22
10.2 System outlet .22
10.2.1 Fully isolated system outlet .22
10.2.2 Semi-isolated system outlet .22
10.2.3 Non-isolated system outlet with protective element.22
10.2.4 Non-isolated system outlet without protective element.23
10.3 Transfer point.23

60728-11  IEC:2005(E) – 3 –
11 Protection against atmospheric over-voltages and elimination of potential
differences .23
11.1 General .23
11.2 Protection of the antenna system.23
11.2.1 Building equipped with a lightning protection system (LPS).23
11.2.2 Building not equipped with an LPS .24
11.3 Earthing and bonding of the antenna system.24
11.3.1 Earthing and bonding mechanisms.24
11.3.2 Earth termination system .24
11.3.3 Earthing conductors .24
11.4 Over-voltage protection .25
12 Mechanical stability .25
12.1 General requirements .25
12.2 Bending moment .25
12.3 Wind-pressure values .25
12.4 Mast construction .26
12.5 Data to be published.26
Annex A (informative) Use of shield wires to protect installations with coaxial cables.42
Annex B (informative) Special conditions using IT power line networks.45
Bibliography .50
Figure 1 – Example of equipotential bonding and earthing of a metal enclosure.27
Figure 2 – Example of equipotential bonding and indirect earthing of a metal enclosure
via a voltage-dependent protective device (in case of balancing currents) .28
Figure 3 – Example of equipotential bonding and earthing of a building installation
(underground connection) .29
Figure 4 – Example of equipotential bonding and earthing a building installation
(above ground connection) .30
Figure 5 – Example of equipotential bonding with a galvanic isolated cable entering a
building (underground connection) .31
Figure 6 – Example of maintaining of equipotential bonding whilst a unit is removed.32
Figure 7 – Example of external safety equipotential bonding .33
Figure 8 – Example of equipotential bonding antennas and head ends .34
Figure 9 – Example of antenna-outdoor-mounting on buildings, where earthing is not
required but recommended .35
Figure 10 – Examples of earthing mechanisms.36
Figure 11 – Example of an over-voltage protective device .37
Figure 12 – Example of application of a coaxial over-voltage protective device .38
Figure 13 – Example of bending moment of an antenna mast .39
Figure 14 – Example of the installation of a safety terminal in Japan .40
Figure 15 – Examples of installation of a lightning protection system in Japan .41
Figure 16 – Examples of earth electrodes in Finland .41
Figure A.1 –Principle of Single Shield Wire .43
Figure A.2 –Principle of Two Shield Wires.44

– 4 – 60728-11  IEC:2005(E)
Figure B.1 – IT power distribution systems in Norway.46
Figure B.2 – Installation of a cabinet in the vicinity of the transforming station .46
Figure B.3 – Example of installations located closer than 20 m to a transforming
station .47
Figure B.4 – Installations in a building.47
Figure B.5 – Installations between buildings.48
Figure B.6 – Cabinets for cable network and mains placed less than 2 m apart.48
Figure B.7 – Cabinets for cable network and mains placed more than 2 m apart .49
Table 1 – Maximum operation voltage and maximum currents for coaxial cables in
different cable network applications .20
Table A.1 –Conductivity of different types of soil .42
Table A.2 – Protections factors (K ) of protection measures against direct lightning
p
strokes for buried cables.43

60728-11  IEC:2005(E) – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
CABLE NETWORKS FOR TELEVISION SIGNALS,
SOUND SIGNALS AND INTERACTIVE SERVICES –
Part 11: Safety
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60728-11 has been prepared by technical area 5: Cable networks
for television signals, sound signals and interactive services, of IEC technical committee 100:
Audio, video and multimedia systems and equipment.
This second edition cancels and replaces the first edition published in 1997 and its
amendment 1 (2000). This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Clause 6, Equipotential bonding and earthing, has been rewritten.
b) Clause 8, Remote power feeding in cable networks, has been rewritten.
c) New informative Annex A: Use of shield wires to protect installations with coaxial cables
d) New informative Annex B: Special conditions using IT power line networks

– 6 – 60728-11  IEC:2005(E)
The text of this standard is based on the following documents:
FDIS Report on voting
100/847A/FDIS 100/896/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
IEC 60728 consists of the following parts, under the general title Cable networks for
television signals, sound signals and interactive services:
Part 1: Methods of measurement and system performance
Part 2: Electromagnetic compatibility for equipment
Part 3: Active coaxial wideband distribution equipment
Part 4: Passive coaxial wideband distribution equipment
Part 5: Headend equipment
Part 6: Optical equipment
Part 7: Hybrid fibre coax outside plant status monitoring
Part 9: Interfaces of cabled distribution systems for digitally modulated signals
Part 10: System performance of return path
Part 11: Safety (this publication)
Part 12: Electromagnetic compatibility of systems
The following differences exist in some countries.
Clause 6:
• The following parts of the standard cannot be used in areas with an IT power distribution
system:
o Examples of installations inside buildings described in 6.2g) and shown in Figures 3
and 4 cannot be used in areas with an IT-network (Norway).
o Examples of installations inside buildings described in 6.2i) and shown in Figure 6
should be equipped with a galvanic isolator separating local earth from the cable
network distribution lines (Norway).
o Examples of installations inside buildings described in 6.2.11 and shown in Figure 7
should be equipped with a galvanic isolator separating local earth from the cable
network distribution lines (Norway).
o Subclauses 6.3.4, 6.3.4.1, 6.3.4.2 and 6.3.5 have no relevance for cable networks in
areas with an IT power distribution system (Norway).
• Common earthing is not permitted due to electrical earthing conditions (France).
Subclause 6.2:
• Galvanic isolation should withstand a voltage of 1 kV r.m.s. during 1 min (France).
• The equipotential bonding method is not used in Japan (Japan).
• Earthing to gas networks as shown in Figures 3 and 4 is not admitted (Japan, Poland).

60728-11  IEC:2005(E) – 7 –
Subclause 8.1:
• Remote power feeding voltage shall not exceed 90 V AC r.m.s and the line-powering
current shall not exceed 15 A (Japan).
Clause 9:
• The French regulation (arrêté interministériel, 2 April 1991) specifies, among many other
parameters, the minimum distance between electric supply wires (isolated and non-
isolated, low-voltage and high-voltage) and any other installation (for example, buildings,
antennas, telecommunication lines, etc.). The main clauses of this regulation, which
concern the cable networks, are Clauses 12, 25, 26, 33, 33bis, 38, 49, 51, 52 and 63.
Clause 9 of this standard specifies distances of 10 mm (indoors) and 20 mm (outdoors),
and this is not sufficient to cover overhead cables. As an example, the minimum distance
between an overhead telecommunication line and an overhead low-voltage (up to 1 kV)
electricity supply line should be 1 m (Clause 33). This distance may be reduced under
specific conditions (Clauses 51, 52 and 63). This regulation specifies also the minimum
distance from high-voltage lines. This distance varies from 1 m to 4 m depending on the
voltage, on the isolation of the cable and on the location (built-up area or not) (Clauses 33
and 63) (France).
• For antennas in proximity of voltages up to 7 000 V, the following applies in Japan:
1. Low voltage: ≤600 V a.c. or ≤750 V d.c.;
Cable:  ≥30 cm distance;
Isolated wire: ≥60 cm distance.
2. High voltage: >600 V a.c. or >750 V d.c.;
Cable:  ≥40 cm distance;
Isolated wire: ≥80 cm distance.
Clause 10:
• The resistance to the equipotential point is not applied, because the bonding method is
not used in Japan. Japanese regulations specify applying the safety terminal. The safety
terminal withstands a continuous a.c. test voltage of 1 000 V for a period of not less than
1 min and maintains an insulation resistance of not less than 1,0 MΩ. Installation of a
safety terminal at the junction point between the indoor cabling and the feeder cable of
the distribution system is shown in Figure 14 (Japan).
Clause 11:
• A lightning protection system is applied in Japan for protection against atmospheric over-
voltages and for the elimination of potential differences. In Japan, installation of a
lightning protection system is necessary in the case where the topmost height of the
construction exceeds 20 m, except in those cases where the construction is inside the
safety zone of another lightning protection system (see Figure 15) (Japan).
Subclause 11.1.1:
• An equipotential bonding conductor is not used, because the bonding method is not used
in Japan (Japan).
Subclause 11.2.2:
• An earth termination system is not used in Japan. Only a lightning protection system is
applied (see Figure 15) (Japan).
• As the conductivity of earth in Finland is lower than what is normal in many other
countries, the earthing electrodes in 11.2.2 should be as shown in Figures 16 a), 16 b)
or 16 c) (Finland).
– 8 – 60728-11  IEC:2005(E)
• The earthing conductors have the following requirements (Japan):
a) Conductors for a lightning rod: ≥30 mm Cu.
b) For an earthing resistance of ≤10 Ω, the diameter has to be at least 2,6 mm Cu.
c) For an earthing resistance of ≤100 Ω, indoors, the diameter has to be at least 1,6 mm
Cu or the cross-sectional area has to be at least 2 mm Cu
d) For an earthing resistance of ≤100 Ω, outdoors, the diameter has to be at least 2,6 mm
Cu or the cross-sectional area has to be at least 5,5 mm Cu.
Subclause 12.2:
• The bending moment of a mast up to 6 m is not applied in Japan. In Japan, the mast shall
not be destroyed by the following wind pressures (Japan):
1. For an antenna height h < 16 m, the wind pressure is 60 h , in kg per m .
2. For an antenna height h ≥ 16 m, the wind pressure is 120 h , in kg per m .
Subclause 12.3:
• The required wind pressure value is 700 N/m for buildings up to 30 m (Finland).
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
60728-11  IEC:2005(E) – 9 –
INTRODUCTION
Standards of the IEC 60728 series deal with cable networks including equipment and
associated methods of measurement for head-end reception, processing and distribution of
television signals, sound signals, interactive multimedia signals, interfaces and their
associated data signals, using all applicable transmission media.
This includes
− CATV networks;
− MATV networks and SMATV networks;
− individual receiving networks;
and all kinds of equipment, systems and installations installed in such networks.
The extent of this standardization work is from the antennas, special signal source inputs to
the head-end or other interface points to the network up to the terminal input.
The standardization of any user terminals (i.e. tuners, receivers, decoders, terminals, etc.) as
well as of any coaxial and optical cables and accessories thereof is excluded.

– 10 – 60728-11  IEC:2005(E)
CABLE NETWORKS FOR TELEVISION SIGNALS,
SOUND SIGNALS AND INTERACTIVE SERVICES –
Part 11: Safety
1 Scope
This part of IEC 60728 deals with the safety requirements applicable to fixed sited systems
and equipment. As far as applicable, it is also valid for mobile and temporarily installed
systems, for example, caravans.
Additional requirements may be applied, for example, referring to
• electrical installations of buildings and overhead lines;
• other telecommunication services distribution systems;
• water distribution systems;
• gas distribution systems;
• lightning systems.
This standard is intended to provide specifically for the safety of the system, personnel
working on it, subscribers and subscriber equipment. It deals only with safety aspects and is
not intended to define a standard for the protection of the equipment used in the system.
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.
IEC 60065:2001, Audio, video and similar electronic apparatus – Safety requirements
IEC 60364 (all parts), Electrical installations of buildings
IEC 60529:2001, Degrees of protection provided by enclosures (IP Code)
IEC 60825-1:2001, Safety of laser products – Part 1: Equipment classification, requirements
and user's guide
IEC 60825-2:2000, Safety of laser products – Part 2: Safety of optical fibre communication
systems (OFCS)
IEC 60950-1:2001, Information technology equipment – Safety – Part 1: General
requirements
IEC 61024-1:1990, Protection of structures against lightning – Part 1: General principles
ISO 3864:2002, Graphical symbols – Safety colours and safety signs – Part 1: Design
principles for safety signs in workplaces and public areas
EN 50117 (all parts), Coaxial cables used in cabled distribution networks

60728-11  IEC:2005(E) – 11 –
3 Terms, definitions, symbols and abbreviations
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
NOTE Some terms have been taken from IEC 60050-195 and IEC 60050-826.
3.1.1
amplifier
device to compensate for attenuation
3.1.2
attenuation
decibel ratio of the input power to the output power
3.1.3
cable networks (for television signals, sound signals and interactive services)
general overall term used to define CATV-networks, MATV-networks, SMATV-networks and
individual receiving networks; these networks can be used in downstream and upstream
directions
3.1.4
CATV network or community antenna television network
network designed to provide sound and television signals as well as signals for interactive
services to communities
3.1.5
earthing arrangement
all the electric connections and devices involved in the earthing of a system, an installation
and equipment
[IEV 195-02-20]
3.1.6
earthing conductor
protective conductor connecting the main earthing terminal or bar to the earth electrode
[IEV 826-04-07]
3.1.7
earth electrode
conductive part or a group of conductive parts in intimate contact with and providing an
electrical connection with earth
[IEV 826-04-02]
3.1.8
earthing terminal
connection point by means of which the earthing or grounding of a conducting part of an
equipment is accomplished
3.1.9
electric shock
pathophysiological effect resulting from an electric current passing through a human or
animal body
[IEV 826-03-04]
– 12 – 60728-11  IEC:2005(E)
3.1.10
equipotential bonding
electrical connection putting various exposed conductive parts and extraneous conductive
parts at a substantially equal potential
[IEV 826-04-09]
3.1.11
equipotential bonding bar
bar to which, for example, extraneous conductive parts (see IEV 826-03-03), metal sheet of
electrical power and telecommunication cables and other cables can be bonded
3.1.12
equipotential bonding conductor
protective conductor for ensuring equipotential bonding
[IEV 826-04-10]
3.1.13
feeder
transmission path forming part of a cable network. Such a path may consist of a metallic
cable, optical fibre, waveguide or any combination of them. By extension, the term is also
applied to paths containing one or more radio links
3.1.14
galvanic isolator
device providing electrical isolation below a certain frequency range.
3.1.15
hazardous voltage
electrical condition of an object from which a hazardous touch current (electric shock) could
be drawn
[IEC 60065:2001, definition 2.6.10]
3.1.16
head-end
equipment, which is connected between receiving antennas or other signal sources and the
remainder of the cable network, to process the signals to be distributed
3.1.17
individual receiving network
network designed to provide sound and television signals as well as signals for interactive
services to an individual household
3.1.18
lightning protection system (LPS)
complete system used to protect a space against the effects of lightning consisting of both
external and internal lightning protection systems
NOTE In particular cases, an LPS may consist of an external LPS or an internal LPS only (see IEC 61024-1).
3.1.19
main earthing terminal; main earthing bar
terminal or bar provided for the connection of protective conductors, including equipotential
bonding conductors and conductors for functional earthing, if any, to the means of earthing
[IEV 826-04-08]
60728-11  IEC:2005(E) – 13 –
3.1.20
MATV network or master antenna television network
network designed to provide sound and television signals as well as signals for interactive
services to households in one or more buildings
3.1.21
metal installation
extended metal items in the space to be protected which may form a path for lightning
current, such as pipe-work, staircases, elevator guide rails, ventilation, heating and air
conditioning ducts, and interconnected reinforcing steel
[IEC 61024-1:1990, definition 1.2.18]
3.1.22
"natural" component of an LPS
component which performs a lightning protection function but is not installed specifically for
that purpose
NOTE Some examples of the use of this term are as follows:
– "natural" air-termination;
–  "natural" down-conductor;
–  "natural" earth electrode.
[IEC 61024-1:1990, definition 1.2.17]
3.1.23
network interface unit (NIU)
interface between the cable network and the network inside an apartment
NOTE The network interface unit can contain an over-voltage protective element and/or a galvanic isolation.
3.1.24
neutral conductor (symbol N)
conductor connected to the neutral point of a system and capable of contributing to the
transmission of electrical energy
[IEV 826-01-03]
3.1.25
PEN conductor
earthed conductor combining the functions of both protective conductor and neutral
conductor.
NOTE The acronym PEN results from the combination of both symbols PE for the protective conductor and N for
the neutral conductor.
[IEV 826-04-06]
3.1.26
protective conductor (symbol PE)
conductor required by some measures for protection against electric shock for electrically
connecting any of the following parts:
– exposed conductive parts;
– extraneous conductive parts;
– main earthing terminal;
– earth electrode;
– earthed point of the source or artificial neutral
[IEV 826-04-05]
– 14 – 60728-11  IEC:2005(E)
3.1.27
receiver lead
lead, which connects the system outlet to the subscriber equipment
3.1.28
receiving antenna
device with proper electrical characteristics that intercepts desired signals in the atmosphere
and transfers these to the remainder of the cable network
3.1.29
remote power feeding voltage
voltage for supplying power to network equipment via the cable network or a separate line
3.1.30
safety distance
minimum distance between two conductive parts within the space to be protected between
which no dangerous sparking can occur
[IEC 61024-1:1990, definition 1.2.23]
3.1.31
SMATV network or satellite master antenna television network
network designed to provide sound and television signals as well as signals for interactive
services, received by satellite receiving antenna eventually combined with terrestrial TV
and/or radio signals, to households in one or more buildings
3.1.32
splitter (spur unit)
device in which the signal power at the (input) port is divided equally or unequally between
two or more (output) ports
NOTE Some forms of this device may be used in the reverse direction for combining signal energy.
3.1.33
spur feeder
feeder to which splitters, subscriber taps or looped system outlets are connected
3.1.34
subscriber equipment
equipment at the subscriber premises such as receivers, tuners, decoders, video recorders,
multimedia terminals
3.1.35
subscriber feeder
feeder connecting a subscriber tap to a system outlet or, where the latter is not used, direct
to the subscriber equipment
3.1.36
subscriber tap
device for connecting a subscriber feeder to a spur feeder
3.1.37
surge suppressor
device designed to limit the surge voltage between two parts within the space to be
protected, such as spark gap, surge diverter or semiconductor device
[IEC 61024-1:1990, definition 1.2.24]

60728-11  IEC:2005(E) – 15 –
3.1.38
system outlet
device for interconnecting a subscriber feeder and a receiver lead
3.1.39
transfer point
interface between the cable network and the building's internal network, each of which may
be separately owned and which may contain a voltage-dependent device and/or galvanic
isolator
3.2 Symbols
The following graphical symbols are used in the figures of this standard.
Coaxial conductor Amplifier
[S00011] [S01240]
System outlet Galvanic isolator
Coaxial over-voltage protective
Over-voltage protective device
device
3.3 Abbreviations
a.c. alter
...