EN IEC 60728-11:2023
(Main)Cable networks for television signals, sound signals and interactive services - Part 11: Safety
Cable networks for television signals, sound signals and interactive services - Part 11: Safety
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 document is intended to provide requirements 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.
Kabelnetze für Fernsehsignale, Tonsignale und interaktive Dienste - Teil 11: Sicherheitsanforderungen
Réseaux de distribution par câbles pour signaux de télévision, signaux de radiodiffusion sonore et services interactifs - Partie 11: Sécurité
IEC 60728-11:2023 est disponible sous forme de IEC 60728-11:2023 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
Kabelska omrežja za televizijske in zvokovne signale ter interaktivne storitve - 11. del: Varnost (IEC 60728-11:2023)
Ta del standarda IEC 60728 obravnava varnostne zahteve, ki veljajo za fiksne sisteme in opremo na mestu uporabe. Kolikor je to ustrezno, se uporablja tudi za premične in začasno nameščene sisteme, na primer v prikolici.
Dodatne zahteve lahko veljajo, kadar se na primer nanašajo na:
• električne napeljave v zgradbah in nadzemne vode,
• druge sisteme za distribucijo telekomunikacijskih storitev,
• sisteme za distribucijo vode,
• sisteme za distribucijo plina,
• sisteme razsvetljave.
Namen tega dokumenta je zagotoviti predvsem zahteve za varnost sistema, osebja, ki ga uporablja, naročnikov in naročniške opreme. Obravnava zgolj varnostne vidike in ni namenjen opredelitvi standarda za zaščito opreme, ki se uporablja v sistemu.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-februar-2024
Kabelska omrežja za televizijske in zvokovne signale ter interaktivne storitve - 11.
del: Varnost (IEC 60728-11:2023)
Cable networks for television signals, sound signals and interactive services - Part 11:
Safety (IEC 60728-11:2023)
Kabelnetze für Fernsehsignale, Tonsignale und interaktive Dienste - Teil 11:
Sicherheitsanforderungen (IEC 60728-11:2023)
Réseaux de distribution par câbles pour signaux de télévision, signaux de radiodiffusion
sonore et services interactifs - Partie 11: Sécurité (IEC 60728-11:2023)
Ta slovenski standard je istoveten z: EN IEC 60728-11:2023
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 IEC 60728-11
NORME EUROPÉENNE
EUROPÄISCHE NORM June 2023
ICS 33.060.40 Supersedes EN 60728-11:2017; EN 60728-
11:2017/A11:2018
English Version
Cable networks for television signals, sound signals and
interactive services - Part 11: Safety
(IEC 60728-11:2023)
Réseaux de distribution par câbles pour signaux de Kabelnetze für Fernsehsignale, Tonsignale und interaktive
télévision, signaux de radiodiffusion sonore et services Dienste - Teil 11: Sicherheitsanforderungen
interactifs - Partie 11: Sécurité (IEC 60728-11:2023)
(IEC 60728-11:2023)
This European Standard was approved by CENELEC on 2023-05-23. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60728-11:2023 E
European foreword
The text of document 100/3866/FDIS, future edition 5 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 approved by CENELEC as EN IEC 60728-11:2023.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2024-02-23
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2026-05-23
document have to be withdrawn
This document supersedes EN 60728-11:2017 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60728-11:2023 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 standard indicated:
IEC 60364 (series) NOTE Approved as HD 60364 (series)
IEC 60728-1 NOTE Approved as EN 60728-1
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 1 Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
- - Power, control and communication cables - EN 50575 2014
Cables for general applications in + A1 2016
construction works subject to reaction to fire
requirements
IEC 60364-1 (mod) 2005 Low-voltage electrical installations - HD 60364-1 2008
Part 1: Fundamental principles, assessment + A11 2017
of general characteristics, definitions
IEC 60364-4-44 2007 Low-voltage electrical installations - HD 60364-4-442 2012
(mod) 2015 Part 4-44: Protection for safety - Protection HD 60364-4-443 2016
+ A1 (mod) 2018 against voltage disturbances and HD 60364-4-444 2010
+ A2 electromagnetic disturbances
IEC 60364-5-52 2009 Low-voltage electrical installations - HD 60364-5-52 2011
(mod) Part 5-52: Selection and erection of
electrical equipment - Wiring systems
IEC 60364-5-54 2011 Low-voltage electrical installations - HD 60364-5-54 2011
+ A1 2021 Part 5-54: Selection and erection of + A11 2017
electrical equipment - Earthing + A1 2022
arrangements and protective conductors
IEC 60529 1989 Degrees of protection provided by EN 60529 1991
+ A1 1999 enclosures (IP Code) + A1 2000
+ A2 2013 + A2 2013
IEC 60990 2016 Methods of measurement of touch current EN 60990 2016
and protective conductor current
IEC 62305-2 (mod) 2010 Protection against lightning - EN 62305-2 2012
Part 2: Risk management
IEC 62305-3 (mod) 2010 Protection against lightning - EN 62305-3 2011
Part 3: Physical damage to structures and
life hazard
IEC 62368-1 2018 Audio/video, information and communication EN IEC 62368-1 2020
technology equipment - Part 1: Safety
requirements
Publication Year Title EN/HD Year
IEC 62561-1 2017 Lightning Protection System Components EN 62561-1 2017
(LPSC) - Part 1: Requirements for
connection components
IEC 62561-2 2018 Lightning protection system components EN IEC 62561-2 2018
(LPSC) - Part 2: Requirements for
conductors and earth electrodes
ISO 7010 2011 Graphical symbols - Safety colours and - -
safety signs - Registered safety signs
ISO/IEC 30129 2015 Telecommunications bonding networks EN 50310 2016
+ A1 2019 for buildings and other structures + A1 2020
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 CEN and/or CENELEC member.
This European Standard does not fall under any Directive/Regulation of the EU.
In the relevant CEN and/or CENELEC countries, these A-deviations are valid instead of the respective
provisions of the European Standard until the national situation causing the A-deviation has changed.
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 except where back-powering
to a network or to outdoor equipment such as preamplifiers, low-noise converters,
polarizers, transmitters in antenna installations is necessary then requirements of 8.2 apply.
11 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.
Annex ZC
(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
6.2 ZC.1 Norway
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 RMS between the input and the output of the outer
conductor of the galvanic isolator for a period of not less than 20 min, the leakage current
shall not exceed 8 mA RMS. Applying a continues DC voltage of 2 120 V 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.
6.3 ZC.2 Norway
ZC.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 ZC.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 62386-1:2018, Annex V).
Key
1 AC power distribution, IT system, 2 Voltage limiter
line-to-line voltage 230 V
3 Equipotential bonding bar 4 Earth electrode
Figure ZC.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.
ZC.2.2 Equipotential bonding mechanism for cable networks
ZC.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 ZC.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 ZC.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"
ISO 7010-W012:2011-05 shall be attached to the non-metallic enclosure.
ZC.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 ZC.4, Figure ZC.5, Figure ZC.6 and Figure ZC.7.
Figure ZC.2 shows an example of installations located farther than 20 m away from a
transforming station.
Key
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 ZC.2 — Example of installations located farther than 20 m
away from a transforming station
Figure ZC.3 shows an example of installations located closer than 20 m from a transforming
station.
Key
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 ZC.3 — Example of installations located closer than 20 m
from a transforming station
Figure ZC.4 shows an example of cabinets for cable network with locally fed equipment and
mains placed less than 2 m apart.
Key
1 Common earth electrode 2 Non-metallic enclosure
3 Equipotential bonding bar 4 Mains supplied equipment
5 Metallic enclosure
Figure ZC.4 — Example of cabinets for cable network with locally fed equipment and
mains placed less than 2 m apart
Figure ZC.5 shows an example of cabinets for cable network with remotely fed equipment
and mains placed less than 2 m apart.
Key
1 Common earth electrode 2 Non-metallic enclosure
3 Equipotential bonding bar 4 Remotely supplied equipment
5 Metallic enclosure
Figure ZC.5 – Example of cabinets for cable network with remotely fed equipment and
mains placed less than 2 m apart
Figure ZC.6 shows an example of cabinets for cable network with locally fed equipment and
mains placed more than 2 m apart.
Key
1 Earth electrode 2 Non-metallic enclosure
3 Equipotential bonding bar 4 Mains supplied equipment
5 Metallic enclosure
Figure ZC.6 — Example of cabinets for cable network with locally fed equipment
and mains placed more than 2 m apart
Figure ZC.7 shows an example of cabinets for cable network with remotely fed equipment
and mains placed more than 2 m apart.
Key
1 Earth electrode 2 Non-metallic enclosure
3 Equipotential bonding bar 4 Remotely supplied equipment
5 Metallic enclosure
Figure ZC.7 — Example of cabinets for cable network with remotely fed equipment and
mains placed more than 2 m apart
ZC.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 ZC.8.
Key
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 ZC.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
ZC.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.
ZC.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
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 ZC.8 and
Figure ZC.9.
Key
1 Amplifier / passive equipment 2 Equipotential bonding conductor
3 Voltage dependent protection device 4 Common earth electrode
5 Pylon
Figure ZC.9 – Example of protection using a voltage depending device on network
installations on poles
12.3 ZC.3 Finland
The required wind pressure value is 700 N/m for buildings up to 30 m.
IEC 60728-11 ®
Edition 5.0 2023-02
INTERNATIONAL
STANDARD
Cable networks for television signals, sound signals and interactive services –
Part 11: Safety
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.060.40 ISBN 978-2-8322-6470-6
– 2 – IEC 60728-11:2023 © IEC 2023
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 9
3 Terms, definitions, symbols and abbreviated terms . 10
3.1 Terms and definitions . 10
3.2 Symbols . 18
3.3 Abbreviated terms . 18
4 Fundamental requirements . 19
4.1 General . 19
4.2 Mechanical requirements . 20
4.2.1 General . 20
4.2.2 Equipment design and construction . 20
4.2.3 Accessible parts . 20
4.3 Radiation . 20
4.4 Electromagnetic radiation. 20
4.5 Thermal protection . 20
4.6 Safety in case of fire and fire reaction . 20
5 Protection against environmental influences . 21
6 Equipotential bonding and earthing . 21
6.1 General requirements . 21
6.2 Equipotential bonding mechanisms . 21
6.3 Equipotential bonding in meshed systems . 32
6.3.1 References to other standards . 32
6.3.2 General on AC mains . 32
6.3.3 AC power distribution and connection of the protective conductor . 32
6.3.4 Dangers and malfunction . 32
6.3.5 Measures. 33
7 Mains-supplied equipment . 33
8 Remote power feeding in cable networks . 34
8.1 Remote power feeding . 34
8.1.1 Maximum allowed voltages . 34
8.1.2 General requirements for equipment . 34
8.1.3 Current-carrying capacity and dielectric strength of the components . 34
8.2 Remote powering from subscriber premises . 35
9 Segregation distances and protection against indirect contact to electric power
distribution systems . 35
9.1 General . 35
9.2 Overhead lines . 35
9.2.1 Overhead lines up to 1 000 V. 35
9.2.2 Overhead lines above 1 000 V . 35
9.3 House installations up to 1 000 V . 35
10 System outlets and transfer points . 36
10.1 General . 36
10.2 System outlet . 36
10.2.1 Types of system outlets . 36
IEC 60728-11:2023 © IEC 2023 – 3 –
10.2.2 Fully isolated system outlet . 37
10.2.3 Semi-isolated system outlet . 37
10.2.4 Non-isolated system outlet with protective element . 37
10.2.5 Non-isolated system outlet without protective element . 37
10.2.6 Fully-isolated system outlet provided by means of a FTTH system . 37
10.3 Transfer point . 39
11 Protection against atmospheric overvoltages and elimination of potential
differences . 40
11.1 General . 40
11.2 Protection of the antenna system . 41
11.2.1 Selection of appropriate methods for protection of antenna systems . 41
11.2.2 Building equipped with a lightning protection system (LPS). 42
11.2.3 Building not equipped with an LPS . 49
11.3 Earthing and bonding of the antenna system . 52
11.3.1 Internal protection system . 52
11.3.2 Earthing conductors . 53
11.3.3 Earth termination system . 55
11.4 Overvoltage protection . 59
12 Mechanical stability . 60
12.1 General requirements . 60
12.2 Bending moment . 60
12.3 Wind-pressure values . 62
12.4 Mast construction . 62
12.5 Data to be published . 63
Annex A (normative) Earth loop impedance . 64
A.1 General . 64
A.2 Earthing for fault conditions . 64
A.3 Earthing to protect against hazardous touch voltage . 65
A.4 Temporary safety measures . 66
Annex B (informative) Use of shield wires to protect installations with coaxial cables . 67
B.1 General . 67
B.2 Soil quality determines shield-wiring necessity . 67
B.3 Protective measures against direct lightning strikes on underground cables . 67
Annex C (informative) Differences in some countries . 70
C.1 Subclause 6.1 . 70
C.1.1 France . 70
C.1.2 Japan . 70
C.2 Subclause 6.2 . 70
C.2.1 France . 70
C.2.2 Norway . 70
C.2.3 Japan and Poland . 70
C.3 Subclause 6.3 – Norway . 70
C.3.1 Justification . 70
C.3.2 Equipotential bonding mechanism for cable networks . 71
C.3.3 Use of galvanic isolation in a cable network with remote power feeding . 76
C.3.4 Use of voltage dependent protective device in a cable network . 77
C.4 Subclause 8.1.1 – Japan . 78
C.5 Subclause 9.1 – France . 79
– 4 – IEC 60728-11:2023 © IEC 2023
C.6 Subclause 9.2 – Japan . 79
C.7 Subclause 10.1 . 79
C.7.1 Sweden . 79
C.7.2 UK . 79
C.8 Subclause 10.2 – Japan . 79
C.9 Subclause 11.1 – Japan . 79
C.10 Subclause 11.2 . 80
C.10.1 Germany . 80
C.10.2 Japan . 80
C.11 Subclause 11.3.2 – Japan . 81
C.12 Subclause 11.3.3 – Japan . 81
C.13 Subclause 12.2 – Japan . 82
C.14 Subclause 12.3 – Finland . 82
Bibliography . 83
Figure 1 – Example of equipotential bonding and earthing of a metal enclosure inside a
non-conductive cabinet for outdoor-use . 23
Figure 2 – Example of equipotential bonding of a building installation . 24
Figure 3 – Example of equipotential bonding and indirect earthing of a metal enclosure
inside a non-conductive cabinet for outdoor-use . 25
Figure 4 – Example of equipotential bonding and earthing of a building installation
(underground connection) . 27
Figure 5 – Example of equipotential bonding and earthing of a building installation
(above ground connection) . 28
Figure 6 – Example of equipotential bonding with a galvanic isolated cable entering a
building (underground connection) . 29
Figure 7 – Example of maintaining equipotential bonding whilst a unit is removed . 31
Figure 8 – MDU building installed with FTTH technology . 39
Figure 9 – Areas of antenna-mounting in or on buildings, where earthing is not
mandatory. 41
Figure 10 – Flow chart for selection of the appropriate method for protecting the
antenna system against atmospheric overvoltages. 44
Figure 11 – Example of equipotential bonded headends and antennas in a protected
volume of the building LPS . 45
Figure 12 – Example of equipotential bonded headends and antennas in a protected
volume of an external horizontally isolated ATS . 46
Figure 13 – Example of equipotential bonded headends and antennas in a protected
volume of an external vertically isolated ATS . 47
Figure 14 – Example of equipotential bonded antennas (not installed in a protected
volume) and headend with direct connection to building LPS . 48
Figure 15 – Example of equipotential bonded headend and earthed antennas (building
without LPS) . 51
Figure 16 – Example of bonding for antennas and headend (building without LPS and
lightning risk lower than or equal to the tolerable risk) . 52
Figure 17 – Example of protecting an antenna system (not installed in a protected
volume) by additional bonding conductors (R > R ) . 55
T
Figure 18 – Examples of earthing mechanisms . 58
Figure 19 – Example of an overvoltage protective device for single dwelling unit . 59
Figure 20 – Example of bending moment of an antenna mast . 61
IEC 60728-11:2023 © IEC 2023 – 5 –
Figure A.1 – Systematic of earth loop resistance . 65
Figure B.1 – Principle of single shield wire . 68
Figure B.2 – Principle of two shield wires . 69
Figure C.1 – IT power distribution system in Norway . 71
Figure C.2 – Example of installations located farther than 20 m away from a
transforming station . 72
Figure C.3 – Example of installations located closer than 20 m from a transforming
station . 72
Figure C.4 – Example of cabinets for cable network with locally fed equipment and
mains placed less than 2 m apart . 73
Figure C.5 – Example of cabinets for cable network with remotely fed equipment and
mains placed less than 2 m apart . 74
Figure C.6 – Example of cabinets for cable network with locally fed equipment and
mains placed more than 2 m apart . 75
Figure C.7 – Example of cabinets for cable network with remotely fed equipment and
mains placed more than 2 m apart . 76
Figure C.8 – Example of an installation placing the amplifier in front of the galvanic
isolator . 77
Figure C.9 – Example of protection using a voltage depending device on network
installations on poles . 78
Figure C.10 – Example of the installation of a safety terminal in Japan . 80
Figure C.11 – Examples of installation of a lightning protection system in Japan . 81
Table 1 – Maximum allowed operation voltages and maximum recommended currents
for coaxial cables . 34
Table 2 – Solutions for protection of antenna systems against atmospheric overvoltage . 42
Table B.1 – Conductivity of different types of soil . 67
Table B.2 – Protection factors (K ) of protection measures against direct lightning
p
strokes for buried cables . 68
– 6 – IEC 60728-11:2023 © IEC 2023
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
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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. It is an International Standard.
This fifth edition cancels and replaces the fourth edition published in 2016. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition.
a) Replacement of references to IEC 60065 and IEC 60950-1 with references to IEC 62368-1.
b) Addition of subclauses 4.4 to 4.6.
c) Revised definition of class I equipment, class II equipment, main earthing terminal, see
3.1.6, 3.1.8 and 3.1.31.
d) Addition of definitions fo
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