EN 60728-11:2010

SLOVENSKI STANDARD
01-februar-2011
1DGRPHãþD
SIST EN 60728-11:2006
Kabelska omrežja za televizijske in zvokovne signale ter interaktivne storitve - 11.
del: Varnost
Cable networks for television signals, sound signals and interactive services - Part 11:
Safety
Ta slovenski standard je istoveten z: EN 60728-11:2010
ICS:
33.060.40 Kabelski razdelilni sistemi Cabled distribution systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 60728-11
NORME EUROPÉENNE
October 2010
EUROPÄISCHE NORM
ICS 33.060.40 Supersedes EN 60728-11:2005

English version
Cable networks for television signals, sound signals and interactive
services -
Part 11: Safety
(IEC 60728-11:2010)
Réseaux câblés pour les signaux de Kabelnetze für Fernsehsignale,
télévision, les signaux sonores et les Tonsignale und interaktive Dienste -
services interactifs - Teil 11: Sicherheitsanforderungen
Partie 11: Sécurité (IEC 60728-11:2010)
(CEI 60728-11:2010)
This European Standard was approved by CENELEC on 2010-10-01. 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, Croatia, 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

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60728-11:2010 E
Foreword
The text of document 100/1679/FDIS, future edition 3 of IEC 60728-11, prepared by IEC TC 100, Audio,
video and multimedia systems and equipment, was submitted to the IEC-CENELEC parallel vote and was
approved by CENELEC as EN 60728-11 on 2010-10-01.
This European Standard supersedes EN 60728-11:2005.
EN 60728-11:2005.
– The list of "differences in some countries" was transferred from the "Foreword" to informative Annex D.
– Some new terms and definitions were added.
– All Figures were reworked among other things concerning equipotential bonding and earthing details
and were incorporated in the text at the appropriate places.
– Clause 11 "Protection against atmospheric overvoltages and elimination of potential differences" was
completely reworked and re-structured taking into account among other things the provisions and
requirements of the EN 62305 series on "Lightning protection".
– New informative Annex A on "Earth loop impedance" was added.
– New informative Annex C on "Examples of calculation of risk due to lightning" was added.
– Former Annex B on "Special conditions using IT power line networks" was re-worded and incorporated
in Annex ZA as "Special National Condition in Norway".
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
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) 2011-07-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2013-10-01
For this European Standard the informative Annex D of IEC 60728-11:2010 shall be disregarded and has
been replaced by the informative Annexes ZA, Special National Conditions, and ZB, A deviations.
Annexes ZA, ZB, and ZC have been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60728-11:2010 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60728-1 NOTE  Harmonized as EN 60728-1.
__________
- 3 - EN 60728-11:2010
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
ZA.1 Norway
6.2
The following parts of the standard are not applicable due to Special National Conditions:
• For new and rebuilt coaxial electronic communication networks the outer
conductor of the coaxial cable leading into a building shall be galvanic and
isolated from the outer conductor of the coaxial cable inside the building;
• Examples of installations inside buildings described in 6.2g, 6.2i, 6.2l and shown in
Figure 2, Figure 4, Figure 5 and Figure 7 shall be equipped with a galvanic isolator
separating local earth from the cable network distribution lines;
• Galvanic isolators shall withstand the following requirements:
• Applying a 50 Hz AC voltage of 300 V between the input and the output of
RMS
the outer conductor of the galvanic isolator for a period of not less than 20 min, the
leakage current shall not exceed 8 mA . Applying a continues DC voltage of 2 120 V
RMS
between the input and the output of the outer conductor of the galvanic isolator for a
period of not less than 1 min, the leakage current shall not exceed 0,7 mA.
It shall not be possible to touch metallic parts of the galvanic isolator when connected.
ZA.2 Norway
6.3
ZA.2.1 Justification
In most parts of Norway, the AC mains power are built as an IT- or TT-network with a line-
to-line voltage of 230 V (see Figure ZA.1).
These types of networks have no N-conductor, and the AC mains power is supplied to the
equipment from two of the three line conductors (IEC 60950-1:2005, Annex V).

L1L1
L2L2
L3L3
1 AC power distribution, IT system, line-to- 2 Voltage limiter
line voltage 230 V
3 Equipotential bonding bar 4 Earth electrode
Figure ZA.1 – IT power distribution system in Norway
For a cable network covering an area with this type of power supply networks, special
initiative should be taken to ensure that safety in the cable network is maintained. The
following equipotential bonding arrangements described will provide necessary safety in
such a network.
ZA.2.2 Equipotential bonding mechanism for cable networks
ZA.2.2.1 Installations in the vicinity of transformer stations
Any earth electrode in a cable network shall preferably be located at a minimum distance of
20 m from the nearest earth electrode in a high-power transformer station (high to mains
voltage) (see Figure ZA.2 and ITU-T K.8 or EN 50174-3).
If the above-mentioned distance is less than 20 m, all equipment in the cable network shall
be electrically isolated from local earth by mounting the equipment within a non-metallic
enclosure, as shown in Figure ZA.3. Mains powered equipment with local power feeding
should not be used in this case.
Before any work on the installation is started, measurements shall be carried out to reveal if
there are any hazardous voltages between local earth and the earth for the cable network.

The safety sign "Warning about hazardous electrical voltage" according to sign 7.4
of ISO 3864-1:2002 shall be attached to the non-metallic enclosure.
ZA.2.2.2 Cabinets for cable networks located near cabinets/
installations for mains
Cabinets for cable networks placed together with cabinets for mains power distributions
should preferably be placed at a minimum of 2 m apart. If the distance is closer than 2 m, a
common earth electrode between the cabinets shall be used. Examples of such installations
are shown in Figure ZA.4, Figure ZA.5, Figure ZA.6 and Figure ZA.7.

- 5 - EN 60728-11:2010
55 22
>>2200 mm mi minniimumum dm diissttaannccee

1 Earth electrode 2 Non-metallic enclosure
3 Equipotential bonding bar 4 Mains supplied equipment
5 Transforming station 6 High-voltage power transmission
system
Figure ZA.2 – Example of installations located farther than 20 m
away from a transforming station
22 44
LLeessss t thhaann 20 20 m m
minminiimmuum dm diistanstanccee

1 Earth electrode 2 Non-metallic enclosure
3 Equipotential bonding bar 4 Remotely supplied equipment
5 Transforming station 6 High-voltage power transmission
system
Figure ZA.3 – Example of installations located closer than 20m
from a transforming station
L1L1L1
L2L2L2
L3L3L3
===
DDiiststance betance betwweeneen
poinpointtss ooff contact contact
L 1 Common earth electrode 2 Non-metallic enclosure
3 Equipotential bonding bar 4 Mains supplied equipment
5 Metallic enclosure
Figure ZA.4 – Example of cabinets for cable network with locally fed equipment
and mains placed less than 2 m apart

L1L1
L2L2
L3L3
DDiiststanancece b beettwweeeenn
poipointntss ooff c coontntaacctt
L 1 Common earth electrode 2 Non-metallic enclosure
3 Equipotential bonding bar 4 Remotely supplied equipment
5 Metallic enclosure
Figure ZA.5 – Example of cabinets for cable network with remotely fed
equipment and mains placed less than 2 m apart

- 7 - EN 60728-11:2010
1 Earth electrode 2 Non-metallic enclosure
3 Equipotential bonding bar 4 Mains supplied equipment
5 Metallic enclosure
Figure ZA.6 – Example of cabinets for cable network with locally fed equipment
and mains placed more than 2 m apart
L1L1
L2L2
L3L3
DDiiststanance ce
bbeettwweeneen poipointntss
ofof con conttactact
L >L > 2 2 mm
33 33
11 11
1 Earth electrode 2 Non-metallic enclosure
3 Equipotential bonding bar 4 Remotely supplied equipment
5 Metallic enclosure
Figure ZA.7 – Example of cabinets for cable network with remotely fed
equipment and mains placed more than 2m apart

ZA.2.3 Use of galvanic isolation in a cable network with remote power-
feeding
When using galvanic isolation in cable networks with remote power feeding, the amplifier
shall be placed in front of the galvanic isolator as shown in Figure ZA.8.
55 66
1 Galvanic isolator 2 Non-metallic enclosure
3 Voltage dependent protection device 4 Common earth electrode
5 CATV system 6 House internal cable-TV network
Figure ZA.8 – Example of an installation placing the amplifier in front
of the galvanic isolator
A voltage dependent protective device is recommended in order to protect the galvanic
isolator from transient voltages.
The amplifier shall be electrically isolated from the local electrical earth. In case the amplifier
is mounted close to either local electrical earth or installations connected to local electrical
earth, the amplifier shall be placed in such a way that it is not possible to physically touch
both the amplifier and the installation without having to remove a cover or other safety
arrangements. The covers and amplifiers shall be labelled with the safety sign given under
ZA.2.2.1. The covers used shall be designed in such a way that they can only be removed
using a key or a special tool.
ZA.2.4 Use of voltage dependent protective device in a cable network.
Network, property and health shall be protected against failure in isolation between
infrastructures with different levels of voltage and other unwanted high voltages caused by
any kind of high voltage distribution networks or atmospheric discharges.
Depending on the voltages time span, all voltages with local earth as a reference shall be
limited according to following values:
0 to 200 ms  1 030 V
201 to 350 ms    780 V
351 to 500 ms    650 V
501 to 1 000 ms   430 V
1 001 to 2 000 ms   300 V
2 001 to 3 000 ms   250 V
- 9 - EN 60728-11:2010
3 001 to 5 000 ms   200 V
5 001 to 10 000 ms   150 V
More than 10 000 ms    60 V
In Norway, network installations with no mains supplied equipment are usually installed
isolated from local earth due to difficult ground conditions. When calculations show that the
voltage level will rise above 650 V, measures must be taken to reduce the voltage level.
This can be done by connecting a voltage dependent device between the network
installation and local earth. The voltage dependent device must not connect the installations
to local earth in case of a short circuit in mains power.
This implies a safe threshold voltage of 420 V.
Examples of protections using a voltage depending device are shown in Figure 3 and
Figure ZA.9.
1 1
1 Amplifier / passive equipment 2 Equipotential bonding conductor
3 Voltage dependent protection device 4 Common earth electrode
5 Pylon
Figure ZA.9 – Example of protection using a voltage depending device on
network installations on poles
ZA.3 Finland
12.3
The required wind pressure value is 700 N/m for buildings up to 30 m.

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 2006/95/EC.
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 ZB.1 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)
10.1 ZB.2 United Kingdom
In the UK the use of fully isolated system outlets is obligatory under the terms of the cable

operating licence.
ZB.3 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.

- 11 - EN 60728-11:2010
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  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

- - Electrical installations of buildings - Protection R 064-004 -
against electromagnetic interferences (EMI) in
installations of buildings
- - Coaxial cables EN 50117 Series

- - Lightning Protection Components (LPC) - EN 50164-1 -
Part 1: Requirements for connection
components
- - Lightning Protection Components (LPC) - EN 50164-2 -
Part 2: Requirements for conductors and earth
electrodes
- - Information technology - Cabling installation - EN 50174-2 -
Part 2: Installation planning and practices inside
buildings
- - Application of equipotential bonding and EN 50310 -
earthing in buildings with information technology
equipment
IEC 60065 (mod) 2001 Audio, video and similar electronic apparatus - EN 60065 2002
Safety requirements + corr. August 2007
+ A11 2008
IEC 60364 Series Electrical installations of buildings - -

IEC 60364-1 - Low-voltage electrical installations - HD 60364-1 -
Part 1: Fundamental principles, assessment
of general characteristics, definitions

IEC 60364-5-52 - Low-voltage electrical installations - HD 60364-5-52 -
Part 5-52: Selection and erection of electrical
equipment - Wiring systems
IEC 60364-5-54 Electrical installations of buildings - HD 60364-5-54 -
Part 5-54: Selection and erection of electrical
equipment - Earthing arrangements, protective
conductors and protective bonding conductors

IEC 60529 - Degrees of protection provided by enclosures - -
(IP Code)
IEC 60617 - Graphical symbols for diagrams - -

IEC 60825-1 - Safety of laser products - EN 60825-1 2007
Part 1: Equipment classification and
requirements
Publication Year Title EN/HD Year

IEC 60825-2 - Safety of laser products - EN 60825-2 -
Part 2: Safety of optical fibre communication
systems (OFCS)
IEC 60950-1 (mod) 2005 Information technology equipment - Safety - EN 60950-1 2006
Part 1: General requirements + A11 2009

IEC 60990 - Methods of measurement of touch current and EN 60990 -
protective conductor current
IEC 61140 2001 Protection against electric shock - Common EN 61140 2002
aspects for installation and equipment

IEC 62305 Series Protection against lightning EN 62305 Series

IEC 62305-2 2006 Protection against lightning - EN 62305-2 2006
Part 2: Risk management + corr. November 2006

IEC 62305-3 (mod) 2006 Protection against lightning - EN 62305-3 2006
Part 3: Physical damage to structures and life + corr. September 2008
hazard + corr. November 2006
+ A11 2009
IEC 62305-4 - Protection against lightning - EN 62305-4 -
Part 4: Electrical and electronic systems within
structures
ISO 3864-1 2002 Graphical symbols - Safety colours and safety - -
signs -
Part 1: Design principles for safety signs in
workplaces and public areas
IEC 60728-11 ®
Edition 3.0 2010-06
INTERNATIONAL
STANDARD
colour
inside
Cable networks for television signals, sound signals and interactive services –
Part 11: Safety
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XB
ICS 33.060.40 ISBN 978-2-88910-993-7
– 2 – 60728-11 © IEC:2010(E)
CONTENTS
FOREWORD.5
INTRODUCTION.7
1 Scope.8
2 Normative references.8
3 Terms, definitions, symbols and abbreviations .9
3.1 Terms and definitions .9
3.2 Symbols .15
3.3 Abbreviations.15
4 Fundamental requirements .16
4.1 General .16
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 .17
6.1 General requirements .17
6.2 Equipotential bonding mechanisms .17
6.3 Equipotential bonding in meshed systems .26
6.3.1 References to other standards .26
6.3.2 General on AC mains.26
6.3.3 AC power distribution and connection of the protective conductor .26
6.3.4 Dangers and malfunction .27
6.3.5 Measures.27
7 Mains-supplied equipment .27
8 Remote power feeding in cable networks .28
8.1 Remote power feeding.28
8.1.1 Maximum allowed voltages .28
8.1.2 General requirements for equipment .28
8.1.3 Current-carrying capacity and dielectric strength of the components .28
8.2 Remote powering from subscriber premises.29
9 Protection against contact and proximity to electric power distribution systems.29
9.1 General .29
9.2 Overhead lines .29
9.2.1 Overhead lines up to 1 000 V .29
9.2.2 Overhead lines above 1 000 V .30
9.3 House installations up to 1 000 V .30
10 System outlets and transfer points .30
10.1 General .30
10.2 System outlet.31
10.2.1 Types of system outlets .31
10.2.2 Fully isolated system outlet .31
10.2.3 Semi-isolated system outlet .31
10.2.4 Non-isolated system outlet with protective element.31
10.2.5 Non-isolated system outlet without protective element .31
10.3 Transfer point .32
11 Protection against atmospheric overvoltages and elimination of potential differences.32

60728-11 © IEC:2010(E) – 3 –
11.1 General .32
11.2 Protection of the antenna system .33
11.2.1 Selection of appropriate methods for protection of antenna systems .33
11.2.2 Building equipped with a lightning protection system (LPS).34
11.2.3 Building not equipped with an LPS .40
11.3 Earthing and bonding of the antenna system .44
11.3.1 Internal protection system .44
11.3.2 Earthing conductors .44
11.3.3 Earth termination system .47
11.4 Overvoltage protection.49
12 Mechanical stability.50
12.1 General requirements .50
12.2 Bending moment.50
12.3 Wind-pressure values .52
12.4 Mast construction .52
12.5 Data to be published.53
Annex A (informative) Earth loop impedance .54
Annex B (informative) Use of shield wires to protect installations with coaxial cables .57
Annex C (informative) Examples of calculation of risk due to lightning .60
Annex D (informative) The following differences exist in some countries .63
Bibliography .74

Figure 1 – Example of equipotential bonding and earthing of a metal enclosure .18
Figure 2 – Example of equipotential bonding .19
Figure 3 – Example of equipotential bonding and indirect earthing of the amplifier and
the cables via a voltage-dependent protective device.20
Figure 4 – Example of equipotential bonding and earthing of a building installation
(underground connection) .21
Figure 5 – Example of equipotential bonding and earthing of a building installation
(above ground connection) .22
Figure 6 – Example of equipotential bonding with a galvanic isolated cable entering a
building (underground connection).23
Figure 7 – Example of maintaining equipotential bonding whilst a unit is removed .25
Figure 8 – Areas of antenna-outdoor-mounting on buildings, where earthing is not
mandatory.33
Figure 9 – Flow chart for selection of the appropriate method for protecting the antenna
system against atmospheric overvoltages.35
Figure 10 – Example of equipotential bonded headends and antennas in a protected
volume of the building LPS.36
Figure 11 – Example of equipotential bonded headends and antennas in a protected
volume of the building LPS.
Figure 12 – Example of equipotential bonded headends and antennas in a protected
volume of an external isolated ATS .38
Figure 13 – Example of equipotential bonded antennas (not installed in a protected
volume) and headend with direct connection to building LPS.39
Figure 14 – Example of equipotential bonded headend and earthed antennas (building
without LPS) .42
Figure 15 – Example of bonding for antennas and headend (building without LPS and
lightning risk lower than or equal to the tolerable risk).43

– 4 – 60728-11 © IEC:2010(E)
Figure 16 – Example of protecting an antenna system (not installed in a protected
volume) by additional discharge conductors (R > R ) .46
T
Figure 17 – Examples of earthing mechanisms (minimum dimensions) .48
Figure 18 – Example of an overvoltage protective device for single dwelling unit.49
Figure 19 – Example of application of a coaxial overvoltage protective device for
multiple dwelling unit .50
Figure 20 – Example of bending moment of an antenna mast .51
Figure A.1 – Systematic of earth loop resistance .55
Figure B.1 – Principle of single shield wire.59
Figure B.2 – Principle of two shield wires.59
Figure C.1 – Template for calculation of the risk due to lightning (Example No. 1).60
Figure C.2 – Template for calculation of the risk due to lightning (Example No. 2).62
Figure D.1 – IT power distribution system in Norway.64
Figure D.2 – Example of installations located farther than 20 m away from a
transforming station .65
Figure D.3 – Example of installations located closer than 20m from a transforming
station.65
Figure D.4 – Example of cabinets for cable network with locally fed equipment and
mains placed less than 2 m apart .66
Figure D.5 – Example of cabinets for cable network with remotely fed equipment and
mains placed less than 2 m apart .66
Figure D.6 – Example of cabinets for cable network with locally fed equipment and
mains placed more than 2 m apart.67
Figure D.7 – Example of cabinets for cable network with remotely fed equipment and
mains placed more than 2m apart.67
Figure D.8 – Example of an installation placing the amplifier in front of the galvanic
isolator.68
Figure D.9 – Example of protection using a voltage depending device on network
installations on poles.69
Figure D.10 – Example of the installation of a safety terminal in Japan .71
Figure D.11 – Examples of installation of a lightning protection system in Japan .72

Table 1 – Maximum allowed operation voltages and maximum allowed currents for
coaxial cables in different cable network applications .29
Table 2 – Solutions for protection of antenna systems against atmospheric
overvoltages .34
Table B.1 – Conductivity of different types of soil.57
Table B.2 – Protection factors (K ) of protection measures against direct lightning
p
strokes for buried cables .58

60728-11 © IEC:2010(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
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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 third edition cancels and replaces the second edition published in 2005. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition.
• The list of "differences in some countries" was transferred from the "Foreword" to
informative Annex D.
• Some new terms and definitions were added.
• All Figures were reworked among other things concerning equipotential bonding and
earthing details and were incorporated in the text at the appropriate places.

– 6 – 60728-11 © IEC:2010(E)
• Clause 11 "Protection against atmospheric overvoltages and elimination of potential
differences" was completely reworked and re-structured taking into account among other
things the provisions and requirements of the IEC 62305 series on "Lightning protection".
• New informative Annex A on "Earth loop impedance" was added.
• New informative Annex C on "Examples of calculation of risk due to lightning" was added.
• Former Annex B on "Special conditions using IT power line networks" was re-worded and
incorporated in Annex D as "Difference in Norway".
The text of this standard is based on the following documents:
FDIS Report on voting
100/1679/FDIS 100/1708/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.
The list of all the parts of the IEC 60728 series, under the general title Cable networks for
television signals, sound signals and interactive services, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until the
stability 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.
A bilingual version of this publication may be issued at a later date.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.

60728-11 © IEC:2010(E) – 7 –
INTRODUCTION
Standards of the IEC 60728 series deal with cable networks including equipment and
associated methods of measurement for headend reception, processing and distribution of
television signals, sound signals and their associated data signals and for processing,
interfacing and transmitting all kinds of signals for interactive services 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.
NOTE CATV encompasses the Hybrid Fibre Coaxial (HFC) networks used nowadays to provide
telecommunications services, voice, data, audio and video both broadcast and narrowcast.
The extent of this standardization work is from the antennas, special signal source inputs to the
headend 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.

– 8 – 60728-11 © IEC:2010(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
...