IEC 60728-11:2005

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

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.It provides 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.

General Information

• Status: Published
• Publication Date: 05-Jan-2005
• ICS: 33.060.40 - Cabled distribution systems
• Technical Committee: TC 100 - Audio, video and multimedia systems and equipment
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 29-Jun-2010

Relations

• Revises: IEC 60728-11:1997 - Cabled distribution systems for television and sound signals - Part 11: Safety
• Effective Date: 05-Sep-2023
• Revises: IEC 60728-11:1997/AMD1:2000 - Amendment 1 - Cabled distribution systems for television and sound signals - Part 11: Safety
• Effective Date: 05-Sep-2023
• Revised: IEC 60728-11:2010 - Cable networks for television signals, sound signals and interactive services - Part 11: Safety
• Effective Date: 05-Sep-2023

Standards Content (Sample)

INTERNATIONAL IEC
STANDARD 60728-11
Second edition
2005-01
Cable networks for television signals,
sound signals and interactive services –
Part 11:
Safety
Reference number
Publication numbering
As from 1 January 1997 all IEC publications are issued with a designation in the

60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.

Consolidated editions
The IEC is now publishing consolidated versions of its publications. For example,

edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the

base publication incorporating amendment 1 and the base publication incorporating

amendments 1 and 2.
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INTERNATIONAL IEC
STANDARD 60728-11
Second edition
2005-01
Cable networks for television signals,
sound signals and interactive services –
Part 11:
Safety
 IEC 2005  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch
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– 2 – 60728-11  IEC:2005(E)
CONTENTS
FOREWORD .5

1 Scope .10

2 Normative references .10

3 Terms, definitions, symbols and abbreviations .11

3.1 Terms and definitions .11

3.2 Symbols .15

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

60728-11  IEC:2005(E) – 3 –
11 Protection against atmospheric over-voltages and elimination of potential

differences .23

11.1 General .23

11.2 Protection of the antenna system.23

11.2.1 Building equipped with a lightning protection system (LPS).23

11.2.2 Building not equipped with an LPS .24

11.3 Earthing and bonding of the antenna system.24

11.3.1 Earthing and bonding mechanisms.24

11.3.2 Earth termination system .24

11.3.3 Earthing conductors .24

11.4 Over-voltage protection .25
12 Mechanical stability .25
12.1 General requirements .25
12.2 Bending moment .25
12.3 Wind-pressure values .25
12.4 Mast construction .26
12.5 Data to be published.26
Annex A (informative) Use of shield wires to protect installations with coaxial cables.42
Annex B (informative) Special conditions using IT power line networks.45
Bibliography .50
Figure 1 – Example of equipotential bonding and earthing of a metal enclosure.27
Figure 2 – Example of equipotential bonding and indirect earthing of a metal enclosure
via a voltage-dependent protective device (in case of balancing currents) .28
Figure 3 – Example of equipotential bonding and earthing of a building installation
(underground connection) .29
Figure 4 – Example of equipotential bonding and earthing a building installation
(above ground connection) .30
Figure 5 – Example of equipotential bonding with a galvanic isolated cable entering a
building (underground connection) .31
Figure 6 – Example of maintaining of equipotential bonding whilst a unit is removed.32

Figure 7 – Example of external safety equipotential bonding .33
Figure 8 – Example of equipotential bonding antennas and head ends .34
Figure 9 – Example of antenna-outdoor-mounting on buildings, where earthing is not
required but recommended .35
Figure 10 – Examples of earthing mechanisms.36
Figure 11 – Example of an over-voltage protective device .37
Figure 12 – Example of application of a coaxial over-voltage protective device .38
Figure 13 – Example of bending moment of an antenna mast .39
Figure 14 – Example of the installation of a safety terminal in Japan .40
Figure 15 – Examples of installation of a lightning protection system in Japan .41
Figure 16 – Examples of earth electrodes in Finland .41
Figure A.1 –Principle of Single Shield Wire .43
Figure A.2 –Principle of Two Shield Wires.44

– 4 – 60728-11  IEC:2005(E)
Figure B.1 – IT power distribution systems in Norway.46

Figure B.2 – Installation of a cabinet in the vicinity of the transforming station .46

Figure B.3 – Example of installations located closer than 20 m to a transforming

station .47

Figure B.4 – Installations in a building.47

Figure B.5 – Installations between buildings.48

Figure B.6 – Cabinets for cable network and mains placed less than 2 m apart.48

Figure B.7 – Cabinets for cable network and mains placed more than 2 m apart .49

Table 1 – Maximum operation voltage and maximum currents for coaxial cables in
different cable network applications .20
Table A.1 –Conductivity of different types of soil .42
Table A.2 – Protections factors (K ) of protection measures against direct lightning
p
strokes for buried cables.43

60728-11  IEC:2005(E) – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION

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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
th
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