IEC 60728-11:2023

Cable networks for television signals, sound signals and interactive services - Part 11: Safety

IEC 60728-11:2023 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. IEC 60728-11:2023 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 for harm, hazard, ordinary person, instructed person, skilled person, see 3.1.22, 3.1.23, 3.1.39, 3.1.40 and 3.1.41.
e) Additional requirement to provide details on the equipment installed, see 4.1.
f) Additional mechanical, design and construction requirements, see 4.2.2.
g) Changes to the accessible part requirements, see 4.2.3.
h) The current carrying capacity and dielectric strength of components is now obligatory, see 8.1.3.
i) The assessment of the risk of lightning strike is now obligatory, see Figure 10.
j) Extension of remote feeding voltage on subscriber feeder, see Table 1.

Réseaux de distribution par câbles pour signaux de télévision, signaux de radiodiffusion sonore et services interactifs – Partie 11: Sécurité

L'IEC 60728-11:2023 traite des exigences de sécurité applicables aux systèmes et matériels fixes. S'il y a lieu, elle couvre également les systèmes mobiles et provisoires, par exemple les caravanes.
Des exigences supplémentaires peuvent s'appliquer, par exemple, pour:
• les installations électriques des bâtiments et les lignes aériennes;
• les autres réseaux de distribution de services de télécommunications;
• les réseaux de distribution d'eau;
• les réseaux de distribution de gaz;
• les systèmes de protection contre la foudre.
Le présent document a pour objet de fournir des exigences spécifiques à la sécurité du système, du personnel qui travaille sur celui-ci, ainsi que des abonnés et des équipements de l'abonné. Il traite uniquement des aspects de sécurité et n'a pas pour objet de définir une norme pour la protection des matériels utilisés dans le système.
L'IEC 60728-11:2023 annule et remplace la quatrième édition parue en 2016. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) les références à l'IEC 60065 et à l'IEC 60950-1 ont été remplacées par des références à l'IEC 62368-1;
b) des paragraphes ont été ajoutés (4.4 à 4.6);
c) les définitions pour les termes matériel de classe I, matériel de classe II et borne principale de terre ont été révisées (voir le 3.1.6, le 3.1.8 et le 3.1.31);
d) des définitions ont été ajoutées pour les termes dommage, danger, personne ordinaire, personne avertie et personne qualifiée (voir le 3.1.22, le 3.1.23, le 3.1.39, le 3.1.40 et le 3.1.41);
e) des exigences ont été ajoutées pour fournir des détails sur le matériel installé (voir le 4.1);
f) des exigences mécaniques, de conception et de construction ont été ajoutées (voir le 4.2.2);
g) les exigences relatives aux parties accessibles ont été modifiées (voir le 4.2.3);
h) le courant admissible et la rigidité diélectrique des composants sont désormais obligatoires (voir le 8.1.3);
i) l'appréciation du risque de foudre est désormais obligatoire (voir la Figure 10);
j) la tension de téléalimentation sur la liaison de connexion d'abonné a été étendue (voir le Tableau 1).

General Information

• Status: Published
• Publication Date: 14-Feb-2023
• ICS: 33.060.40 - Cabled distribution systems
• Technical Committee: TA 5 - Cable networks for television signals, sound signals and interactive services
• Drafting Committee: WG 1 - TC 100/TA 5/WG 1
• Current Stage: PPUB - Publication issued
• Start Date: 15-Feb-2023
• Completion Date: 17-Mar-2023

Relations

• Revises: IEC 60728-11:2016 - Cable networks for television signals, sound signals and interactive services - Part 11: Safety
• Effective Date: 05-Sep-2023
• Revises: IEC 60728-11:2016/COR1:2016 - Corrigendum 1 - Cable networks for television signals, sound signals and interactive services - Part 11: Safety
• Effective Date: 05-Sep-2023

Overview - IEC 60728-11:2023 (Cable networks safety)

IEC 60728-11:2023 is the international safety standard for cable networks delivering television, sound and interactive services. It defines safety requirements for fixed-site systems and equipment and - where applicable - for mobile or temporary installations (for example, caravans). The document addresses safety of the system, personnel, subscribers and subscriber equipment, but does not set requirements for protection of the equipment itself. Edition 5.0 (2023) cancels the 2016 edition and introduces several technical revisions to align with modern risk and design practices.

Key topics and technical requirements

The standard concentrates on practical safety measures for cable and antenna distribution systems. Key topics include:

• Fundamental requirements for design, mechanical integrity and accessible parts.
• Equipotential bonding and earthing arrangements to prevent hazardous potential differences.
• Protection against atmospheric overvoltages and lightning (including an obligatory lightning-risk assessment).
• Remote power feeding requirements for subscriber feeders, including maximum voltages and mandatory component current-carrying capacity and dielectric strength.
• Mains-supplied equipment safety and segregation distances from electric power distribution systems and overhead lines.
• System outlets and transfer points (fully isolated, semi-isolated, non-isolated types) and FTTH-specific considerations.
• Mechanical stability: mast and mounting design, bending moment and wind-pressure criteria.
• Documentation requirements: details of installed equipment and published data for installations.

Significant 2023 technical updates include replacement of references to IEC 60065/60950-1 with IEC 62368-1, new subclauses, revised equipment class definitions, added definitions for harm/hazard and user competency, expanded mechanical/design rules, and mandatory assessments for lightning risk and component electrical ratings.

Applications and practical value

IEC 60728-11:2023 is used to:

• Design and certify safe cable-TV headends, antenna systems, coaxial distribution and FTTH installations.
• Specify earthing/bonding methods and overvoltage protection for building owners and service providers.
• Define safe remote powering of subscriber equipment and feeder circuits.
• Inform installation procedures for contractors, integrators and maintenance personnel.

Keywords: IEC 60728-11:2023, cable networks safety, remote power feeding, equipotential bonding, earthing, lightning protection, FTTH, system outlets.

Who should use this standard

• Network designers and system integrators (MSOs, broadband operators)
• Installation and maintenance contractors
• Electrical safety engineers and compliance officers
• Building owners, facility managers and regulators

Related standards

• IEC 62368-1 (replace references in previous editions)
• Relevant national standards for electrical installations, lightning protection and telecommunication distribution systems (see Annex C for country differences).

Standards Content (Sample)

IEC 60728-11 ®
Edition 5.0 2023-02
INTERNATIONAL
STANDARD
Cable networks for television signals, sound signals and interactive services –
Part 11: Safety
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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

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

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
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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.
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 for harm, hazard, ordinary person, instructed person, skilled person,
see 3.1.22, 3.1.23, 3.1.39, 3.1.40 and 3.1.41.

e) Additional requirement to provide details on the equipment installed, see 4.1.
f) Additional mechanical, design and construction requirements, see 4.2.2.
g) Changes to the accessible part requirements, see 4.2.3.
h) The current carrying capacity and dielectric strength of components is now obligatory, see
8.1.3.
i) The assessment of the risk of lightning strike is now obligatory, see Figure 10.
j) Extension of remote feeding voltage on subscriber feeder, see Table 1.
The text of this standard is based on the following documents:
Draft Report on voting
100/3866/FDIS 100/3882/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.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
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 document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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.

– 8 – IEC 60728-11:2023 © IEC 2023
INTRODUCTION
Standards and other deliverables of the IEC 60728 series deal with cable networks including
equipment and associated methods of measurement for headend reception, processing and
distribution of television and sound signals and for processing, interfacing and transmitting all
kinds of data signals for interactive services using all applicable transmission media. These
signals are typically transmitted in networks by frequency-multiplexing techniques.
This includes for instance:
• regional and local broadband cable networks,
• extended satellite and terrestrial television distribution networks and systems,
• individual satellite and terrestrial television receiving systems,
and all kinds of equipment, systems and installations used in such cable networks, distribution
and receiving systems.
The extent of this standardization work is from the antennas and/or special signal source inputs
to the headend or other interface points to the network up to the terminal input of the customer
premises equipment.
The standardization work will consider coexistence with users of the RF spectrum in wired and
wireless transmission systems.
The standardization of any user terminals (i.e. tuners, receivers, decoders, multimedia terminals,
etc.) as well as of any coaxial, balanced and optical cables and accessories thereof is excluded.

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 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.
2 Normative references
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.
IEC 60364-1:2005, Low-voltage electrical installations – Part 1: Fundamental principles,
assessment of general characteristics, definitions
IEC 60364-4-44:2007, Low-voltage electrical installations – Part 4-44: Protection for safety –
Protection against voltage disturbances and electromagnetic disturbances
IEC 60364-4-44:2007/AMD1:2015
IEC 60364-4-44:2007/AMD2:2018
IEC 60364-5-52:2009, Low-voltage electrical installations – Part 5-52: Selection and erection
of electrical equipment – Wiring systems
IEC 60364-5-54:2011, Low-voltage electrical installations – Part 5-54: Selection and erection
of electrical equipment – Earthing arrangements and protective conductors
IEC 60364-5-54:2011/AMD1:2021
IEC 60529:1989, Degrees of protection provided by enclosures (IP Code)
IEC 60529:1989/AMD1:1999
IEC 60529:1989/AMD2:2013
IEC 60990:2016, Methods of measurement of touch current and protective conductor current

– 10 – IEC 60728-11:2023 © IEC 2023
IEC 62305-2:2010, Protection against lightning – Part 2: Risk management
IEC 62305-3:2010, Protection against lightning – Part 3: Physical damage to structures and life
hazard
IEC 62368-1:2018, Audio/video, information and communication technology equipment – Part 1:
Safety requirements
IEC 62561-1:2017, Lightning protection system components (LPSC) – Part 1: Requirements for
connection components
IEC 62561-2, Lightning protection system components (LPSC) – Part 2: Requirements for
conductors and earth electrodes
ISO 7010, Graphical symbols – Safety colours and safety signs – Registered safety signs
ISO/IEC 30129:2015, Information technology – Telecommunications bonding networks for
buildings and other structures
ISO/IEC 30129:2015/AMD1:2019
EN 50575:2014, Power, control and communication cables – Cables for general applications in
construction works subject to reaction to fire requirements
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp.
3.1.1
air-termination system
part of an external LPS using metallic elements such as rods, mesh conductors or catenary
wires intended to intercept lightning flashes
[SOURCE: IEC 62305-3:2010, 3.6]
3.1.2
amplifier
device to compensate for attenuation
3.1.3
attenuation
ratio of the input power to the output power
Note 1 to entry: The ratio is expressed in decibels.

3.1.4
cable networks
television signals, sound signals and interactive services, regional and local broadband cable
networks, extended satellite and terrestrial television distribution networks or systems and
individual satellite and terrestrial television receiving systems
Note 1 to entry: These networks and systems can be used in downstream and upstream directions.
3.1.5
CATV network
regional and local broadband cable networks designed to provide sound and television signals
as well as signals for interactive services to a regional or local area
Note 1 to entry: Originally defined as Community Antenna Television network.
3.1.6
class I equipment
equipment in which protection against electric shock does not rely on basic insulation only, but
that includes a supplementary safeguard in such a way that means are provided for the
connection of accessible conductive parts to the protective earthing conductor in the fixed wiring
of the installation
Note 1 to entry: For equipment intended for use with a flexible cord or cable, this provision includes a protective
conductor as part of the flexible cord or cable.
Note 2 to entry: Class I equipment can be provided with class II construction.
Note 3 to entry: This entry is based on IEC 62368-1:2018, 3.3.15.1.
3.1.7
class II construction
part of an equipment for which protection against electric shock relies upon double
insulation or reinforced insulation
Note 1 to entry: This entry is based on IEC 62368-1:2018, 3.3.15.2.
3.1.8
class II equipment
equipment in which protection against electric shock does not rely on basic insulation only, but
in which a supplementary safeguard is provided, there being no provision for protective earthing
or reliance upon installation conditions
Note 1 to entry: This entry is based on IEC 62368-1:2018, 3.3.15.3.
3.1.9
earthing arrangement
all electrical means involved in the earthing of a system, installation or equipment
Note 1 to entry: Electric connection and devices used for earthing are examples of electrical means.
[SOURCE: IEC 60050-195:2021, 195-02-20, modified – The preferred term "grounding
arrangement (US)" has been deleted.]
3.1.10
earthing conductor
conductor forming a conductive path between a conductive part and an earth electrode
EXAMPLE A conductor connected between a main earthing terminal or busbar and an earth electrode.
[SOURCE: IEC 60050-195:2021, 195-02-03, modified – The preferred term "grounding
conductor (US)" has been deleted.]

– 12 – IEC 60728-11:2023 © IEC 2023
3.1.11
earth electrode
conductive part that is in electric contact with local earth, directly or through an intermediate
conductive medium
[SOURCE: IEC 60050-195:2021, 195-02-01, modified – The preferred term "grounding
electrode (US)" has been deleted.]
3.1.12
earthing terminal
terminal provided on equipment and intended for the electric connection with the earthing
arrangement
[SOURCE: IEC 60050-195:2021, 195-02-31, modified – The preferred term "grounding terminal
(US)" has been deleted.]
3.1.13
electric shock
physiological effect resulting from an electric current passing through a human or livestock
[SOURCE: IEC 60050-195:2021, 195-01-04, modified – The specific use electric shock> has been deleted.]
3.1.14
equipotential bonding
set of electric connections intended to achieve equipotentiality between conductive parts
[SOURCE: IEC 60050-195:2021, 195-01-10]
3.1.15
equipotential bonding bar
busbar which is part of an equipotential bonding system and enables the electric connection of
a number of conductors for equipotential bonding purposes
[SOURCE: IEC 60050-826:2022, 826-13-35]
3.1.16
protective bonding conductor
protective conductor provided for protective-equipotential-bonding
[SOURCE: IEC 60050-195:2021, 195-02-10.]
3.1.17
exposed conductive part
conductive part of equipment that can be touched and that is not live under normal conditions,
but that can become live when basic insulation fails
[SOURCE: IEC 60050-195:2021, 195-06-10]

3.1.18
extended terrestrial television distribution network or system
distribution network or system designed to provide sound and television signals received by
terrestrial receiving antenna to households in one or more buildings
Note 1 to entry: This kind of network or system can possibly be combined with a satellite antenna for the additional
reception of TV and/or radio signals via satellite networks.
Note 2 to entry: This kind of network or system can also carry other signals for special transmission systems (e.g.
MoCA or Wi-Fi) in the return path direction.
3.1.19
extraneous conductive part
conductive part not forming part of the electrical installation and that is likely to introduce an
electric potential, generally the electric potential of a local earth
[SOURCE: IEC 60050-195:2021, 195-06-11]
3.1.20
feeder
transmission path forming part of a cable network
Note 1 to entry: Such a path may consist of a metallic cable, optical fibre, waveguide or any combination of them.
Note 2 to entry: By extension, the term is also applied to paths containing one or more radio links.
3.1.21
galvanic isolator
device providing electrical isolation below a certain frequency range
3.1.22
harm
physical injury or damage to persons, property, and domestic animals
Note 1 to entry: Physical injury or damage to persons also includes health aspects.
Note 2 to entry: This entry is based on ISO/IEC Guide 51:2014, 3.1.
3.1.23
hazard
potential source of harm
Note 1 to entry: The term hazard can be qualified in order to define its origin (e.g. electrical hazard, mechanical
hazard) or the nature of the potential harm (e.g. electric shock hazard, cutting hazard, toxic hazard, fire hazard).
Note 2 to entry: This entry is based on ISO/IEC Guide 51:2014, 3.2.
3.1.24
hazardous voltage
electrical condition of an object from which a hazardous touch current (electric shock) could be
drawn
[SOURCE: IEC 60065:2014, 2.6.10, modified – The term "hazardous live" has been replaced
by "hazardous voltage".]
3.1.25
headend
equipment connected between receiving antennas or other signal sources and the remainder
of the cable network, to process the signals to be distributed

– 14 – IEC 60728-11:2023 © IEC 2023
3.1.26
home distributor
HD
physical distribution point within a home where cables terminate
Note 1 to entry: This note applies to the French language only.
3.1.27
individual terrestrial television receiving system
system designed to provide sound and television signals received via terrestrial broadcast
networks to an individual household
Note 1 to entry: This kind of system can also carry other signals for special transmission systems (e.g. MoCA or
Wi-Fi) in the return path direction.
3.1.28
let-go threshold current
value of the maximum electric current through the human body at which that human being can
release himself or herself
[SOURCE: IEC 60050-195:2021, 195-03-09.]
3.1.29
lightning protection system
LPS
complete system used to reduce physical damage due to lightning flashes to a structure
Note 1 to entry: It consists of both external and internal lightning protection systems.
[SOURCE: IEC 62305-3:2010, 3.1]
3.1.30
local broadband cable network
network designed to provide sound and television signals as well as signals for interactive
services to a local area (e.g. one town or one village)
3.1.31
main earthing terminal
main earthing bar
terminal or busbar that is part of the earthing arrangement of an installation and enabling the
electric connection of a number of conductors used for earthing or bonding purposes
[SOURCE: IEC 60050-195:2021, 195-02-33, modified – The preferred terms "main grounding
terminal (US)" and "main grounding busbar (US)" have been deleted and, in the term, "busbar"
has been abbreviated to "bar".]
3.1.32
MATV network
extended terrestrial television distribution networks or systems designed to provide sound and
television signals received by terrestrial receiving antenna to households in one or more
buildings
Note 1 to entry: Originally defined as master antenna television network.
Note 2 to entry: This kind of network or system can possibly be combined with a satellite antenna for the additional
reception of TV and/or radio signals via satellite networks.
Note 3 to entry: This kind of network or system can also carry other signals for special transmission systems (e.g.
MoCA or Wi-Fi) in the return path direction.

3.1.33
metal installation
extended metal items in the structure to be protected which may form a path for lightning
current, such as pipework, staircases, elevator guide rails, ventilation, heating and air
conditioning ducts, and interconnected reinforcing steel
[SOURCE: IEC 62305-3:2010, 3.18]
3.1.34
multiple-stranded conductor
stranded conductor consisting of a number of groups of wires assembled together in one or
more helical layers, the wires in each group being either bunched or stranded
[SOURCE: IEC 60050-461:2008, 461-01-10]
3.1.35
natural component of LPS
conductive component installed not specifically for lightning protection which can be used in
addition to the LPS or in some cases could provide the function of one or more parts of the LPS
Note 1 to entry: Examples of the use of this term include:
• natural air-termination;
• natural down-conductor;
• natural earthing electrode.
[SOURCE: IEC 62305-3:2010, 3.15]
3.1.36
network interface unit
NIU
interface between the cable network and the network inside an apartment
Note 1 to entry:
...

IEC 60728-11 ®
Edition 5.0 2023-02
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Cable networks for television signals, sound signals and interactive services –
Part 11: Safety
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IEC 60728-11 ®
Edition 5.0 2023-02
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Cable networks for television signals, sound signals and interactive services –
Part 11: Safety
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.060.40 ISBN 978-2-8322-6530-7

– 2 – IEC 60728-11:2023 RLV © IEC 2023
CONTENTS
FOREWORD . 6
INTRODUCTION . 2
1 Scope . 10
2 Normative references . 10
3 Terms, definitions, symbols and abbreviated terms . 11
3.1 Terms and definitions . 12
3.2 Symbols . 20
3.3 Abbreviated terms . 21
4 Fundamental requirements . 22
4.1 General . 22
4.2 Mechanical requirements . 22
4.2.1 General . 22
4.2.2 Equipment design and construction . 22
4.2.3 Accessible parts . 23
4.4 Laser radiation .
4.3 Radiation . 23
4.4 Electromagnetic radiation. 23
4.5 Thermal protection . 23
4.6 Safety in case of fire and fire reaction . 23
5 Protection against environmental influences . 23
6 Equipotential bonding and earthing . 23
6.1 General requirements . 23
6.2 Equipotential bonding mechanisms . 24
6.3 Equipotential bonding in meshed systems . 38
6.3.1 References to other standards . 38
6.3.2 General on AC mains . 38
6.3.3 AC power distribution and connection of the protective conductor . 38
6.3.4 Dangers and malfunction . 38
6.3.5 Measures. 39
7 Mains-supplied equipment . 39
8 Remote power feeding in cable networks . 39
8.1 Remote power feeding . 40
8.1.1 Maximum allowed voltages . 40
8.1.2 General requirements for equipment . 40
8.1.3 Current-carrying capacity and dielectric strength of the components . 40
8.2 Remote powering from subscriber premises . 41
9 Segregation distances and protection against indirect contact and proximity to
electric power distribution systems . 41
9.1 General . 41
9.2 Overhead lines . 42
9.2.1 Overhead lines up to 1 000 V. 42
9.2.2 Overhead lines above 1 000 V . 42
9.3 House installations up to 1 000 V . 42
10 System outlets and transfer points . 42
10.1 General . 42
10.2 System outlet . 43

10.2.1 Types of system outlets . 43
10.2.2 Fully isolated system outlet . 43
10.2.3 Semi-isolated system outlet . 43
10.2.4 Non-isolated system outlet with protective element . 43
10.2.5 Non-isolated system outlet without protective element . 44
10.2.6 Fully-isolated system outlet provided by means of a FTTH system . 44
10.3 Transfer point . 46
11 Protection against atmospheric overvoltages and elimination of potential
differences . 47
11.1 General . 47
11.2 Protection of the antenna system . 48
11.2.1 Selection of appropriate methods for protection of antenna systems . 48
11.2.2 Building equipped with a lightning protection system (LPS). 49
11.2.3 Building not equipped with an LPS . 60
11.3 Earthing and bonding of the antenna system . 66
11.3.1 Internal protection system . 66
11.3.2 Earthing conductors . 66
11.3.3 Earth termination system . 69
11.4 Overvoltage protection . 72
12 Mechanical stability . 73
12.1 General requirements . 73
12.2 Bending moment . 73
12.3 Wind-pressure values . 75
12.4 Mast construction . 75
12.5 Data to be published . 76
Annex A (informativenormative) Earth loop impedance . 77
A.1 General . 77
A.2 Earthing for fault conditions . 77
A.3 Earthing to protect against hazardous touch voltage . 78
A.4 Temporary safety measures . 79
Annex B (informative) Use of shield wires to protect installations with coaxial cables . 80
B.1 General . 80
B.2 Soil quality determines shield-wiring necessity . 80
B.3 Protective measures against direct lightning strikes on underground cables . 80
Annex C (informative) Differences in some countries . 83
C.1 Subclause 6.1 . 83
C.1.1 France . 83
C.1.2 Japan . 83
C.2 Subclause 6.2 . 83
C.2.1 France . 83
C.2.2 Norway . 83
C.2.3 Japan and Poland . 83
C.3 Subclause 6.3 – Norway . 83
C.3.1 Justification . 83
C.3.2 Equipotential bonding mechanism for cable networks . 84
C.3.3 Use of galvanic isolation in a cable network with remote power feeding . 90
C.3.4 Use of voltage dependent protective device in a cable network . 91
C.4 Subclause 8.1.1 – Japan . 92

– 4 – IEC 60728-11:2023 RLV © IEC 2023
C.5 Subclause 9.1 – France . 93
C.6 Subclause 9.2 – Japan . 93
C.7 Subclause 10.1 . 93
C.7.1 Sweden . 93
C.7.2 UK . 93
C.8 Subclause 10.2 – Japan . 93
C.9 Subclause 11.1 – Japan . 93
C.10 Subclause 11.2 . 94
C.10.1 Germany . 94
C.10.2 Japan . 94
C.11 Subclause 11.3.2 – Japan . 96
C.12 Subclause 11.3.3 – Japan . 96
C.13 Subclause 12.2 – Japan . 97
C.14 Subclause 12.3 – Finland . 97
Bibliography . 98

Figure 1 – Example of equipotential bonding and earthing of a metal enclosure inside a
non-conductive cabinet for outdoor-use . 26
Figure 2 – Example of equipotential bonding of a building installation . 27
Figure 3 – Example of equipotential bonding and indirect earthing of a metal enclosure
inside a non-conductive cabinet for outdoor-use . 28
Figure 4 – Example of equipotential bonding and earthing of a building installation
(underground connection) . 30
Figure 5 – Example of equipotential bonding and earthing of a building installation
(above ground connection) . 32
Figure 6 – Example of equipotential bonding with a galvanic isolated cable entering a
building (underground connection) . 34
Figure 7 – Example of maintaining equipotential bonding whilst a unit is removed . 37
Figure 8 – MDU building installed with FTTH technology . 46
Figure 9 – Areas of antenna-mounting in or on buildings, where earthing is not
mandatory. 48
Figure 10 – Flow chart for selection of the appropriate method for protecting the
antenna system against atmospheric overvoltages. 51
Figure 11 – Example of equipotential bonded headends and antennas in a protected
volume of the building LPS . 53
Figure 12 – Example of equipotential bonded headends and antennas
in a protected volume of the building LPS an external horizontally isolated ATS . 55
Figure 13 – Example of equipotential bonded headends and antennas in a protected
volume of an external vertically isolated ATS . 57
Figure 14 – Example of equipotential bonded antennas (not installed in a protected
volume) and headend with direct connection to building LPS . 59
Figure 15 – Example of equipotential bonded headend and earthed antennas (building
without LPS) . 63
Figure 16 – Example of bonding for antennas and headend (building without LPS and
lightning risk lower than or equal to the tolerable risk) . 65
Figure 17 – Example of protecting an antenna system (not installed in a protected
volume) by additional bonding conductors (R > R ) . 69
T
Figure 18 – Examples of earthing mechanisms (minimum dimensions) . 72
Figure 19 – Example of an overvoltage protective device for single dwelling unit . 73

Figure 20 – Example of bending moment of an antenna mast . 74
Figure A.1 – Systematic of earth loop resistance . 78
Figure B.1 – Principle of single shield wire . 82
Figure B.2 – Principle of two shield wires . 82
Figure C.1 – IT power distribution system in Norway . 84
Figure C.2 – Example of installations located farther than 20 m away from a
transforming station . 85
Figure C.3 – Example of installations located closer than 20 m from a transforming
station . 86
Figure C.4 – Example of cabinets for cable network with locally fed equipment and
mains placed less than 2 m apart . 87
Figure C.5 – Example of cabinets for cable network with remotely fed equipment and
mains placed less than 2 m apart . 88
Figure C.6 – Example of cabinets for cable network with locally fed equipment and
mains placed more than 2 m apart . 89
Figure C.7 – Example of cabinets for cable network with remotely fed equipment and
mains placed more than 2 m apart . 90
Figure C.8 – Example of an installation placing the amplifier in front of the galvanic
isolator . 91
Figure C.9 – Example of protection using a voltage depending device on network
installations on poles . 92
Figure C.10 – Example of the installation of a safety terminal in Japan . 94
Figure C.11 – Examples of installation of a lightning protection system in Japan . 96

Table 1 – Maximum allowed operation voltages and maximum recommended currents
for coaxial cables in the EN 50117 series . 41
Table 2 – Solutions for protection of antenna systems against atmospheric overvoltage . 49
Table B.1 – Conductivity of different types of soil . 80
Table B.2 – Protection factors (K ) of protection measures against direct lightning
p
strokes for buried cables . 81

– 6 – IEC 60728-11:2023 RLV © 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
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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.
This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition IEC 60728-11:2016. A vertical bar appears in the margin
wherever a change has been made. Additions are in green text, deletions are in
strikethrough red text.
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 for harm, hazard, ordinary person, instructed person, skilled person,
see 3.1.22, 3.1.23, 3.1.39, 3.1.40 and 3.1.41.
e) Additional requirement to provide details on the equipment installed, see 4.1.
f) Additional mechanical, design and construction requirements, see 4.2.2.
g) Changes to the accessible part requirements, see 4.2.3.
h) The current carrying capacity and dielectric strength of components is now obligatory, see
8.1.3.
i) The assessment of the risk of lightning strike is now obligatory, see Figure 10.
j) Extension of remote feeding voltage on subscriber feeder, see Table 1.
The text of this standard is based on the following documents:
Draft Report on voting
100/3866/FDIS 100/3882/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.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
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.

– 8 – IEC 60728-11:2023 RLV © IEC 2023
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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.

INTRODUCTION
Standards and other deliverables of the IEC 60728 series deal with cable networks including
equipment and associated methods of measurement for headend reception, processing and
distribution of television and sound signals and for processing, interfacing and transmitting all
kinds of data signals for interactive services using all applicable transmission media. These
signals are typically transmitted in networks by frequency-multiplexing techniques.
This includes for instance:
• regional and local broadband cable networks,
• extended satellite and terrestrial television distribution networks and systems,
• individual satellite and terrestrial television receiving systems,
and all kinds of equipment, systems and installations used in such cable networks, distribution
and receiving systems.
The extent of this standardization work is from the antennas and/or special signal source inputs
to the headend or other interface points to the network up to the terminal input of the customer
premises equipment.
The standardization work will consider coexistence with users of the RF spectrum in wired and
wireless transmission systems.
The standardization of any user terminals (i.e. tuners, receivers, decoders, multimedia terminals,
etc.) as well as of any coaxial, balanced and optical cables and accessories thereof is excluded.

– 10 – IEC 60728-11:2023 RLV © IEC 2023
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 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.
2 Normative references
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.
IEC 60065:2014, Audio, video and similar electronic apparatus – Safety requirements
IEC 60364-1:2005, Low-voltage electrical installations – Part 1: Fundamental principles,
assessment of general characteristics, definitions
IEC 60364-4-44:2007, Low-voltage electrical installations – Part 4-44: Protection for safety –
Protection against voltage disturbances and electromagnetic disturbances
IEC 60364-4-44:2007/AMD1:2015
IEC 60364-4-44:2007/AMD2:2018
IEC 60364-5-52:2009, Low-voltage electrical installations – Part 5-52: Selection and erection
of electrical equipment – Wiring systems
IEC 60364-5-54:2011, Low-voltage electrical installations – Part 5-54: Selection and erection
of electrical equipment – Earthing arrangements and protective conductors
IEC 60364-5-54:2011/AMD1:2021
IEC 60529:1989, Degrees of protection provided by enclosures (IP Code)
IEC 60529:1989/AMD1:1999
IEC 60529:1989/AMD2:2013
IEC 60728-2, Cable networks for television signals, sound signals and interactive services –
Part 2: Electromagnetic compatibility for equipment
IEC 60825-1, Safety of laser products – Part 1: Equipment classification and requirements
IEC 60825-2, Safety of laser products – Part 2: Safety of optical fibre communication systems
(OFCS)
IEC 60950-1:2005, Information technology equipment – Safety – Part 1: General requirements
IEC 60990:2016, Methods of measurement of touch current and protective conductor current
IEC 61140:2001, Protection against electric shock – Common aspects for installation and
equipment
IEC 61140:2001/AMD1:2004
IEC 62305 (all parts), Protection against lightning
IEC 62305-2:2010, Protection against lightning – Part 2: Risk management
IEC 62305-3:2010, Protection against lightning – Part 3: Physical damage to structures and life
hazard
IEC 62305-4:2010, Protection against lightning – Part 4: Electrical and electronic systems
within structures
IEC 62368-1:2018, Audio/video, information and communication technology equipment – Part 1:
Safety requirements
IEC 62561-1:2017, Lightning protection system components (LPSC) – Part 1: Requirements for
connection components
IEC 62561-2, Lightning protection system components (LPSC) – Part 2: Requirements for
conductors and earth electrodes
ISO 3864-1:2011, Graphical symbols – Safety colours and safety signs – Part 1: Design
principles for safety signs in workplaces and public areas
ISO 7010, Graphical symbols – Safety colours and safety signs – Registered safety signs
ISO/IEC 30129:2015, Information technology – Telecommunications bonding networks for
buildings and other structures
ISO/IEC 30129:2015/AMD1:2019
EN 50117 (all parts), Coaxial cables
EN 50164-1, Lightning Protection Components (LPC) – Part 1: Requirements for connection
components
EN 50164-2, Lightning Protection Components (LPC) – Part 2: Requirements for conductors
and earth electrodes
EN 50174-2, Information technology – Cabling installation – Part 2: Installation planning and
practices inside buildings
– 12 – IEC 60728-11:2023 RLV © IEC 2023
EN 50310, Application of equipotential bonding and earthing in buildings with information
technology equipment
EN 50575:2014, Power, control and communication cables – Cables for general applications in
construction works subject to reaction to fire requirements
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp.
NOTE Some terms have been taken from IEC 60050-195, IEC 60050-826 and IEC 60050-851, with the reference
number in square brackets, and from other IEC standards, also referenced to in square brackets.
3.1.1
air-termination system
part of an external LPS using metallic elements such as rods, mesh conductors or catenary
wires intended to intercept lightning flashes
[SOURCE: IEC 62305-3:2010, 3.6]
3.1.2
amplifier
device to compensate for attenuation
3.1.3
attenuation
ratio of the input power to the output power
Note 1 to entry: The ratio is expressed in decibels.
3.1.4
cable networks
television signals, sound signals and interactive services, regional and local broadband cable
networks, extended satellite and terrestrial television distribution networks or systems and
individual satellite and terrestrial television receiving systems
Note 1 to entry: These networks and systems can be used in downstream and upstream directions.
3.1.5
CATV network
regional and local broadband cable networks designed to provide sound and television signals
as well as signals for interactive services to a regional or local area
Note 1 to entry: Originally defined as Community Antenna Television network.
3.1.6
class I equipment
equipment with basic insulation as provision for basic protection and protective bonding as
provision for fault protection, in accordance with IEC 61140:2001, 7.1
[SOURCE: IEC 60050-851:2008, 851-15-10]

equipment in which protection against electric shock does not rely on basic insulation only, but
that includes a supplementary safeguard in such a way that means are provided for the
connection of accessible conductive parts to the protective earthing conductor in the fixed wiring
of the installation
Note 1 to entry: For equipment intended for use with a flexible cord or cable, this provision includes a protective
conductor as part of the flexible cord or cable.
Note 2 to entry: Class I equipment can be provided with class II construction.
Note 3 to entry: This entry is based on IEC 62368-1:2018, 3.3.15.1.
3.1.7
class II construction
part of an equipment for which protection against electric shock relies upon double
insulation or reinforced insulation
Note 1 to entry: This entry is based on IEC 62368-1:2018, 3.3.15.2.
3.1.8
class II equipment
equipment with basic insulation as provision for basic protection, and supplementary insulation
as provision for fault protection, or in which basic and fault protection are provided by reinforced
insulation, in accordance with IEC 61140:2001, 7.3
[SOURCE: IEC 60050-851:2008, 851-15-11]
equipment in which protection against electric shock does not rely on basic insulation only, but
in which a supplementary safeguard is provided, there being no provision for protective earthing
or reliance upon installation conditions
Note 1 to entry: This entry is based on IEC 62368-1:2018, 3.3.15.3.
3.1.9
earthing arrangement
all the electric connections and devices involved in the earthing of a system, an installation and
equipment
[SOURCE: IEC 60050-195:1998, 195-02-20, modified – The preferred term "grounding
arrangement (US), and the deprecated term "earthing system" have been deleted.]
all electrical means involved in the earthing of a system, installation or equipment
Note 1 to entry: Electric connection and devices used for earthing are examples of electrical means.
[SOURCE: IEC 60050-195:2021, 195-02-20, modified – The preferred term "grounding
arrangement (US)" has been deleted.]
3.1.10
earthing conductor
conductor which provides a conductive path, or part of the conductive path, between a given
point in a system or in an installation or in equipment and an earth electrode or an earth-
electrode network
Note 1 to entry: In the electrical installation of a building, the given point is usually the main earthing terminal, and
the earthing conductor connects this point to the earth electrode or the earth-electrode network.
[SOURCE: IEC 60050-826:2004, 826-13-12, modified – The preferred term "grounding
conductor (US)", and the deprecated term "earth conductor" have been deleted.]
conductor forming a conductive path between a conductive part and an earth electrode

– 14 – IEC 60728-11:2023 RLV © IEC 2023
EXAMPLE A conductor connected between a main earthing terminal or busbar and an earth electrode.
[SOURCE: IEC 60050-195:2021, 195-02-03, modified – The preferred term "grounding
conductor (US)" has been deleted.]
3.1.11
earth electrode
conductive part, which may be embedded in the soil or in a specific conductive medium, e.g.
concrete or coke, in electric contact with the Earth
[SOURCE: IEC 60050-826:2004, 826-13-05, modified – The preferred term "ground electrode
(US)" has been deleted.]
conductive part that is in electric contact with local earth, directly or through an intermediate
conductive medium
[SOURCE: IEC 60050-195:2021, 195-02-01, modified – The preferred term "grounding
electrode (US)" has been deleted.]
3.1.12
earthing terminal
terminal provided on equipment or on a device and intended for the electric connection with the
earthing arrangement
[SOURCE: IEC 60050-195:19982021, 195-02-31, modified – The preferred term "grounding
terminal (US)", and the deprecated term "earth terminal" have has been deleted.]
3.1.13
electric shock
physiological effect resulting from an electric current passing through a human or animal body
livestock
[SOURCE: IEC 60050-826:2004, 826-12-01 IEC 60050-195:2021, 195-01-04, modified – The
specific use has been deleted.]
3.1.14
equipotential bonding
provision of electric connections between conductive parts, intended to achieve equipotentiality
[SOURCE: IEC 60050-826:2004, 826-13-19]
set of electric connections intended to achieve equipotentiality between conductive parts
[SOURCE: IEC 60050-195:2021, 195-01-10]
3.1.15
equipotential bonding bar
busbar which is part of an equipotential bonding system and enables the electric connection of
a number of conductors for equipotential bonding purposes
[SOURCE: IEC 60050-826:20042022, 826-13-35]
3.1.16
protective bonding conductor
protective conductor provided for protective-equipotential-bonding
[SOURCE: IEC 60050-826:2004, 826-13-24, modified – The deprecated term "equipotential
bonding conductor" has been deleted IEC 60050-195:2021, 195-02-10.]

3.1.17
exposed conductive part
conductive part of equipment that can be touched and that is not normally live under normal
conditions, but that can become live when basic insulation fails
[SOURCE: IEC 60050-195:19982021, 195-06-10]
3.1.17
extended satellite television distribution network or system
distribution network or system designed to provide sound and television signals received by
satellite receiving antenna to households in one or more buildings
Note 1 to entry: This kind of network or system can be combined with terrestrial antennas for the additional reception
of TV and/or radio signals via terrestrial networks.
Note 2 to entry: This kind of network or system can also carry control signals for satellite switched systems or other
signals for special transmission systems (e.g. MoCA or WiFi) in the return path direction.
3.1.18
extended terrestrial television distribution network or system
distribution network or system designed to provide sound and television signals received by
terrestrial receiving antenna to households in one or more buildings
Note 1 to entry: This kind of network or system can possibly be combined with a satellite antenna for the additional
reception of TV and/or radio signals via satellite networks.
Note 2 to entry: This kind of network or system can also carry other signals for special transmission systems (e.g.
MoCA or Wi-Fi) in the return path direction.
3.1.19
extraneous conductive part
conductive part not forming part of the electrical installation and liable that is likely to introduce
an electric potential, generally the electric potential of a local earth
[SOURCE: IEC 60050-195:19982021, 195-06-11]
3.1.20
feeder
transmission path forming part of a cable network
Note 1 to entry: Such a path may consist of a metallic cable, optical
...

IEC 60728-11 ®
Edition 5.0 2023-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Cable networks for television signals, sound signals and interactive services –
Part 11: Safety
Réseaux de distribution par câbles pour signaux de télévision, signaux de
radiodiffusion sonore et services interactifs –
Partie 11: Sécurité
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IEC 60728-11 ®
Edition 5.0 2023-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Cable networks for television signals, sound signals and interactive services –

Part 11: Safety
Réseaux de distribution par câbles pour signaux de télévision, signaux de

radiodiffusion sonore et services interactifs –

Partie 11: Sécurité
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.060.40  ISBN 978-2-8322-7441-5

– 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

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

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
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6) All users should ensure that they have the latest edition of this publication.
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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.
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 for harm, hazard, ordinary person, instructed person, skilled person,
see 3.1.22, 3.1.23, 3.1.39, 3.1.40 and 3.1.41.

e) Additional requirement to provide details on the equipment installed, see 4.1.
f) Additional mechanical, design and construction requirements, see 4.2.2.
g) Changes to the accessible part requirements, see 4.2.3.
h) The current carrying capacity and dielectric strength of components is now obligatory, see
8.1.3.
i) The assessment of the risk of lightning strike is now obligatory, see Figure 10.
j) Extension of remote feeding voltage on subscriber feeder, see Table 1.
The text of this standard is based on the following documents:
Draft Report on voting
100/3866/FDIS 100/3882/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.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
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 document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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.

– 8 – IEC 60728-11:2023 © IEC 2023
INTRODUCTION
Standards and other deliverables of the IEC 60728 series deal with cable networks including
equipment and associated methods of measurement for headend reception, processing and
distribution of television and sound signals and for processing, interfacing and transmitting all
kinds of data signals for interactive services using all applicable transmission media. These
signals are typically transmitted in networks by frequency-multiplexing techniques.
This includes for instance:
• regional and local broadband cable networks,
• extended satellite and terrestrial television distribution networks and systems,
• individual satellite and terrestrial television receiving systems,
and all kinds of equipment, systems and installations used in such cable networks, distribution
and receiving systems.
The extent of this standardization work is from the antennas and/or special signal source inputs
to the headend or other interface points to the network up to the terminal input of the customer
premises equipment.
The standardization work will consider coexistence with users of the RF spectrum in wired and
wireless transmission systems.
The standardization of any user terminals (i.e. tuners, receivers, decoders, multimedia terminals,
etc.) as well as of any coaxial, balanced and optical cables and accessories thereof is excluded.

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 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.
2 Normative references
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.
IEC 60364-1:2005, Low-voltage electrical installations – Part 1: Fundamental principles,
assessment of general characteristics, definitions
IEC 60364-4-44:2007, Low-voltage electrical installations – Part 4-44: Protection for safety –
Protection against voltage disturbances and electromagnetic disturbances
IEC 60364-4-44:2007/AMD1:2015
IEC 60364-4-44:2007/AMD2:2018
IEC 60364-5-52:2009, Low-voltage electrical installations – Part 5-52: Selection and erection
of electrical equipment – Wiring systems
IEC 60364-5-54:2011, Low-voltage electrical installations – Part 5-54: Selection and erection
of electrical equipment – Earthing arrangements and protective conductors
IEC 60364-5-54:2011/AMD1:2021
IEC 60529:1989, Degrees of protection provided by enclosures (IP Code)
IEC 60529:1989/AMD1:1999
IEC 60529:1989/AMD2:2013
IEC 60990:2016, Methods of measurement of touch current and protective conductor current

– 10 – IEC 60728-11:2023 © IEC 2023
IEC 62305-2:2010, Protection against lightning – Part 2: Risk management
IEC 62305-3:2010, Protection against lightning – Part 3: Physical damage to structures and life
hazard
IEC 62368-1:2018, Audio/video, information and communication technology equipment – Part 1:
Safety requirements
IEC 62561-1:2017, Lightning protection system components (LPSC) – Part 1: Requirements for
connection components
IEC 62561-2, Lightning protection system components (LPSC) – Part 2: Requirements for
conductors and earth electrodes
ISO 7010, Graphical symbols – Safety colours and safety signs – Registered safety signs
ISO/IEC 30129:2015, Information technology – Telecommunications bonding networks for
buildings and other structures
ISO/IEC 30129:2015/AMD1:2019
EN 50575:2014, Power, control and communication cables – Cables for general applications in
construction works subject to reaction to fire requirements
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp.
3.1.1
air-termination system
part of an external LPS using metallic elements such as rods, mesh conductors or catenary
wires intended to intercept lightning flashes
[SOURCE: IEC 62305-3:2010, 3.6]
3.1.2
amplifier
device to compensate for attenuation
3.1.3
attenuation
ratio of the input power to the output power
Note 1 to entry: The ratio is expressed in decibels.

3.1.4
cable networks
television signals, sound signals and interactive services, regional and local broadband cable
networks, extended satellite and terrestrial television distribution networks or systems and
individual satellite and terrestrial television receiving systems
Note 1 to entry: These networks and systems can be used in downstream and upstream directions.
3.1.5
CATV network
regional and local broadband cable networks designed to provide sound and television signals
as well as signals for interactive services to a regional or local area
Note 1 to entry: Originally defined as Community Antenna Television network.
3.1.6
class I equipment
equipment in which protection against electric shock does not rely on basic insulation only, but
that includes a supplementary safeguard in such a way that means are provided for the
connection of accessible conductive parts to the protective earthing conductor in the fixed wiring
of the installation
Note 1 to entry: For equipment intended for use with a flexible cord or cable, this provision includes a protective
conductor as part of the flexible cord or cable.
Note 2 to entry: Class I equipment can be provided with class II construction.
Note 3 to entry: This entry is based on IEC 62368-1:2018, 3.3.15.1.
3.1.7
class II construction
part of an equipment for which protection against electric shock relies upon double
insulation or reinforced insulation
Note 1 to entry: This entry is based on IEC 62368-1:2018, 3.3.15.2.
3.1.8
class II equipment
equipment in which protection against electric shock does not rely on basic insulation only, but
in which a supplementary safeguard is provided, there being no provision for protective earthing
or reliance upon installation conditions
Note 1 to entry: This entry is based on IEC 62368-1:2018, 3.3.15.3.
3.1.9
earthing arrangement
all electrical means involved in the earthing of a system, installation or equipment
Note 1 to entry: Electric connection and devices used for earthing are examples of electrical means.
[SOURCE: IEC 60050-195:2021, 195-02-20, modified – The preferred term "grounding
arrangement (US)" has been deleted.]
3.1.10
earthing conductor
conductor forming a conductive path between a conductive part and an earth electrode
EXAMPLE A conductor connected between a main earthing terminal or busbar and an earth electrode.
[SOURCE: IEC 60050-195:2021, 195-02-03, modified – The preferred term "grounding
conductor (US)" has been deleted.]

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3.1.11
earth electrode
conductive part that is in electric contact with local earth, directly or through an intermediate
conductive medium
[SOURCE: IEC 60050-195:2021, 195-02-01, modified – The preferred term "grounding
electrode (US)" has been deleted.]
3.1.12
earthing terminal
terminal provided on equipment and intended for the electric connection with the earthing
arrangement
[SOURCE: IEC 60050-195:2021, 195-02-31, modified – The preferred term "grounding terminal
(US)" has been deleted.]
3.1.13
electric shock
physiological effect resulting from an electric current passing through a human or livestock
[SOURCE: IEC 60050-195:2021, 195-01-04, modified – The specific use electric shock> has been deleted.]
3.1.14
equipotential bonding
set of electric connections intended to achieve equipotentiality between conductive parts
[SOURCE: IEC 60050-195:2021, 195-01-10]
3.1.15
equipotential bonding bar
busbar which is part of an equipotential bonding system and enables the electric connection of
a number of conductors for equipotential bonding purposes
[SOURCE: IEC 60050-826:2022, 826-13-35]
3.1.16
protective bonding conductor
protective conductor provided for protective-equipotential-bonding
[SOURCE: IEC 60050-195:2021, 195-02-10.]
3.1.17
exposed conductive part
conductive part of equipment that can be touched and that is not live under normal conditions,
but that can become live when basic insulation fails
[SOURCE: IEC 60050-195:2021, 195-06-10]

3.1.18
extended terrestrial television distribution network or system
distribution network or system designed to provide sound and television signals received by
terrestrial receiving antenna to households in one or more buildings
Note 1 to entry: This kind of network or system can possibly be combined with a satellite antenna for the additional
reception of TV and/or radio signals via satellite networks.
Note 2 to entry: This kind of network or system can also carry other signals for special transmission systems (e.g.
MoCA or Wi-Fi) in the return path direction.
3.1.19
extraneous conductive part
conductive part not forming part of the electrical installation and that is likely to introduce an
electric potential, generally the electric potential of a local earth
[SOURCE: IEC 60050-195:2021, 195-06-11]
3.1.20
feeder
transmission path forming part of a cable network
Note 1 to entry: Such a path may consist of a metallic cable, optical fibre, waveguide or any combination of them.
Note 2 to entry: By extension, the term is also applied to paths containing one or more radio links.
3.1.21
galvanic isolator
device providing electrical isolation below a certain frequency range
3.1.22
harm
physical injury or damage to persons, property, and domestic animals
Note 1 to entry: Physical injury or damage to persons also includes health aspects.
Note 2 to entry: This entry is based on ISO/IEC Guide 51:2014, 3.1.
3.1.23
hazard
potential source of harm
Note 1 to entry: The term hazard can be qualified in order to define its origin (e.g. electrical hazard, mechanical
hazard) or the nature of the potential harm (e.g. electric shock hazard, cutting hazard, toxic hazard, fire hazard).
Note 2 to entry: This entry is based on ISO/IEC Guide 51:2014, 3.2.
3.1.24
hazardous voltage
electrical condition of an object from which a hazardous touch current (electric shock) could be
drawn
[SOURCE: IEC 60065:2014, 2.6.10, modified – The term "hazardous live" has been replaced
by "hazardous voltage".]
3.1.25
headend
equipment connected between receiving antennas or other signal sources and the remainder
of the cable network, to process the signals to be distributed

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3.1.26
home distributor
HD
physical distribution point within a home where cables terminate
Note 1 to entry: This note applies to the French language only.
3.1.27
individual terrestrial television receiving system
system designed to provide sound and television signals received via terrestrial broadcast
networks to an individual household
Note 1 to entry: This kind of system can also carry other signals for special transmission systems (e.g. MoCA or
Wi-Fi) in the return path direction.
3.1.28
let-go threshold current
...