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

IEC 60728-11:2016 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. This fourth edition cancels and replaces the third edition published in 2010. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- Correction of minimum cross-section of bonding conductor in Figure 6, Figure 14 and Figure 17.
- Creation of new symbols for "overvoltage protective device - (OPD)" and for "coaxial overvoltage protective device - (COPD)".
- Introduction of new OPD symbol to 3.2, Figure 3 and Figure 6.
- Introduction of new COPD symbol to 3.2 and Figure 19.
- In 3.1 replacement of terms CATV, MATV and SMATV by new terms and definitions due to changes in technology and use of cable networks.
- Extension for remote feeding voltage on subscriber feeder.
- Adaption to Edition 2.0 of the IEC 62305 series.
- Deletion of informative Annex C and normative reference to the simplified software for the calculation of risk due to lightning (Annex J of IEC 62305-2:2006.)
- New subclause 10.2.6 Fully-isolated system outlet provided by means of a FTTH system. The contents of the corrigendum of July 2016 have been included in this copy.

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

L'IEC 60728-11:2016 traite des exigences de sécurité applicables aux systèmes et aux équipements fixes. Elle couvre également les systèmes mobiles et provisoires, caravanes par exemple, pour les exigences qui leur sont applicables. Cette quatrième édition annule et remplace la troisième édition parue en 2010. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- Correction de la section minimale du conducteur de liaison dans la Figure 6, la Figure 14 et la Figure 17.
- Création de nouveaux symboles pour "dispositif de protection contre les surtensions - (OPD)" et "dispositif de protection contre les surtensions coaxial - (COPD)".
- Introduction du nouveau symbole OPD dans 3.2, la Figure 3 et la Figure 6.
- Introduction du nouveau symbole COPD dans 3.2 et la Figure 19.
- Dans 3.1, remplacement des termes CATV, MATV et SMATV par de nouveaux termes et définitions en raison des modifications de technologie et de l'utilisation de réseaux de distribution par câbles.
- Extension pour tension de téléalimentation sur la ligne de raccordement.
- Adaptation du document complet selon l'édition 2.0 de la série IEC 62305.
- Suppression de l'Annexe informative C et de la référence normative au logiciel simplifié pour le calcul du risque lié à la foudre (Annexe J de l'IEC 62305-2:2006).
- Nouveau paragraphe 10.2.6 Prise d'abonné entièrement isolée fournie au moyen d'un système FTTH. Le contenu du corrigendum de juillet 2016 a été pris en considération dans cet exemplaire.

General Information

Status
Published
Publication Date
23-Mar-2016
Current Stage
PPUB - Publication issued
Start Date
24-Mar-2016
Completion Date
24-Mar-2016
Ref Project

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IEC 60728-11
Edition 4.0 2016-03
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
IEC 60728-11:2016-03(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60728-11
Edition 4.0 2016-03
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 978-2-8322-3161-6

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 60728-11:2016 © IEC 2016
CONTENTS

FOREWORD ......................................................................................................................... 6

INTRODUCTION ................................................................................................................... 8

1 Scope ............................................................................................................................ 9

2 Normative references..................................................................................................... 9

3 Terms, definitions, symbols and abbreviations .............................................................. 10

3.1 Terms and definitions .......................................................................................... 10

3.2 Symbols .............................................................................................................. 17

3.3 Abbreviations ...................................................................................................... 17

4 Fundamental requirements........................................................................................... 18

4.1 General ............................................................................................................... 18

4.2 Mechanical requirements ..................................................................................... 19

4.3 Accessible parts .................................................................................................. 19

4.4 Laser radiation .................................................................................................... 19

5 Protection against environmental influences ................................................................. 19

6 Equipotential bonding and earthing .............................................................................. 19

6.1 General requirements .......................................................................................... 19

6.2 Equipotential bonding mechanisms ...................................................................... 19

6.3 Equipotential bonding in meshed systems ............................................................ 30

6.3.1 References to other standards ...................................................................... 30

6.3.2 General on AC mains ................................................................................... 30

6.3.3 AC power distribution and connection of the protective conductor ................. 30

6.3.4 Dangers and malfunction .............................................................................. 30

6.3.5 Measures ..................................................................................................... 31

7 Mains-supplied equipment ........................................................................................... 31

8 Remote power feeding in cable networks...................................................................... 32

8.1 Remote power feeding ........................................................................................ 32

8.1.1 Maximum allowed voltages ........................................................................... 32

8.1.2 General requirements for equipment ............................................................. 32

8.1.3 Current-carrying capacity and dielectric strength of the components .............. 32

8.2 Remote powering from subscriber premises ......................................................... 33

9 Protection against contact and proximity to electric power distribution systems ............. 33

9.1 General ............................................................................................................... 33

9.2 Overhead lines .................................................................................................... 33

9.2.1 Overhead lines up to 1 000 V ....................................................................... 33

9.2.2 Overhead lines above 1 000 V ...................................................................... 34

9.3 House installations up to 1 000 V......................................................................... 34

10 System outlets and transfer points ............................................................................... 34

10.1 General ............................................................................................................... 34

10.2 System outlet ...................................................................................................... 35

10.2.1 Types of system outlets ................................................................................ 35

10.2.2 Fully isolated system outlet .......................................................................... 35

10.2.3 Semi-isolated system outlet .......................................................................... 35

10.2.4 Non-isolated system outlet with protective element ....................................... 35

10.2.5 Non-isolated system outlet without protective element .................................. 36

10.2.6 Fully-isolated system outlet provided by means of a FTTH system ................ 36

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IEC 60728-11:2016 © IEC 2016 – 3 –

10.3 Transfer point ..................................................................................................... 36

11 Protection against atmospheric overvoltages and elimination of potential

differences .................................................................................................................. 37

11.1 General ............................................................................................................... 37

11.2 Protection of the antenna system ......................................................................... 38

11.2.1 Selection of appropriate methods for protection of antenna systems .............. 38

11.2.2 Building equipped with a lightning protection system (LPS) ........................... 39

11.2.3 Building not equipped with an LPS ............................................................... 47

11.3 Earthing and bonding of the antenna system ........................................................ 51

11.3.1 Internal protection system ............................................................................ 51

11.3.2 Earthing conductors ..................................................................................... 51

11.3.3 Earth termination system .............................................................................. 54

11.4 Overvoltage protection ........................................................................................ 56

12 Mechanical stability ..................................................................................................... 57

12.1 General requirements .......................................................................................... 57

12.2 Bending moment ................................................................................................. 58

12.3 Wind-pressure values .......................................................................................... 59

12.4 Mast construction ................................................................................................ 59

12.5 Data to be published ........................................................................................... 59

Annex A (informative) Earth loop impedance ...................................................................... 61

A.1 General ............................................................................................................... 61

A.2 Earthing for fault conditions ................................................................................. 61

A.3 Earthing to protect against hazardous touch voltage ............................................ 62

A.4 Temporary safety measures ................................................................................ 63

Annex B (informative) Use of shield wires to protect installations with coaxial cables ........... 64

B.1 General ............................................................................................................... 64

B.2 Soil quality determines shield-wiring necessity ..................................................... 64

B.3 Protective measures against direct lightning strikes on under ground cables ........ 64

Annex C (informative) Differences in some countries .......................................................... 67

C.1 Subclause 6.1 ..................................................................................................... 67

C.1.1 France ......................................................................................................... 67

C.1.2 Japan .......................................................................................................... 67

C.2 Subclause 6.2 ..................................................................................................... 67

C.2.1 France ......................................................................................................... 67

C.2.2 Norway ........................................................................................................ 67

C.2.3 Japan and Poland ........................................................................................ 67

C.3 Subclause 6.3 – Norway ...................................................................................... 67

C.3.1 Justification ................................................................................................. 67

C.3.2 Equipotential bonding mechanism for cable networks .................................... 68

C.3.3 Use of galvanic isolation in a cable network with remote power-feeding ......... 73

C.3.4 Use of voltage dependent protective device in a cable network ..................... 73

C.4 Subclause 8.1.1 – Japan ..................................................................................... 75

C.5 Subclause 9.1 – France ....................................................................................... 75

C.6 Subclause 9.2 – Japan ........................................................................................ 75

C.7 Subclause 10.1 ................................................................................................... 75

C.7.1 Sweden ....................................................................................................... 75

C.7.2 UK ............................................................................................................... 75

C.8 Subclause 10.2 – Japan ...................................................................................... 75

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– 4 – IEC 60728-11:2016 © IEC 2016

C.9 Subclause 11.1 – Japan ...................................................................................... 76

C.10 Subclause 11.2 ................................................................................................... 76

C.10.1 Germany ...................................................................................................... 76

C.10.2 Japan .......................................................................................................... 76

C.11 Subclause 11.3.2 – Japan ................................................................................... 77

C.12 Subclause 11.3.3 – Japan ................................................................................... 77

C.13 Subclause 12.2 – Japan ...................................................................................... 77

C.14 Subclause 12.3 – Finland .................................................................................... 78

Bibliography ....................................................................................................................... 79

Figure 1 – Example of equipotential bonding and earthing of a metal enclosure inside

a non-conductive cabinet for outdoor-use ............................................................................ 21

Figure 2 – Example of equipotential bonding of a building installation .................................. 22

Figure 3 – Example of equipotential bonding and indirect earthing of a metal enclosure

inside a non-conductive cabinet for outdoor-use .................................................................. 23

Figure 4 – Example of equipotential bonding and earthing of a building installation

(underground connection) ................................................................................................... 25

Figure 5 – Example of equipotential bonding and earthing of a building installation

(above ground connection) .................................................................................................. 26

Figure 6 – Example of equipotential bonding with a galvanic isolated cable entering a

building (underground connection) ...................................................................................... 27

Figure 7 – Example of maintaining equipotential bonding whilst a unit is removed ................ 29

Figure 8 − MDU building installed with FTTH technology ...................................................... 36

Figure 9 – Areas of antenna-mounting in or on buildings, where earthing is not

mandatory .......................................................................................................................... 38

Figure 10 – Flow chart for selection of the appropriate method for protecting the

antenna system against atmospheric overvoltages .............................................................. 41

Figure 11 – Example of equipotential bonded headends and antennas in a protected

volume of the building LPS .................................................................................................. 43

Figure 12 – Example of equipotential bonded headends and antennas in a protected

volume of the building LPS .................................................................................................. 44

Figure 13 – Example of equipotential bonded headends and antennas in a protected

volume of an external isolated ATS ..................................................................................... 45

Figure 14 – Example of equipotential bonded antennas (not installed in a protected

volume) and headend with direct connection to building LPS ............................................... 46

Figure 15 – Example of equipotential bonded headend and earthed antennas (building

without LPS) ....................................................................................................................... 49

Figure 16 – Example of bonding for antennas and headend (building without LPS and

lightning risk lower than or equal to the tolerable risk) ......................................................... 50

Figure 17 – Example of protecting an antenna system (not installed in a protected

volume) by additional bonding conductors (R > R ) ............................................................. 53

Figure 18 – Examples of earthing mechanisms (minimum dimensions) ................................. 56

Figure 19 – Example of an overvoltage protective device for single dwelling unit .................. 57

Figure 20 – Example of bending moment of an antenna mast ............................................... 58

Figure A.1 – Systematic of earth loop resistance ................................................................. 62

Figure B.1 – Principle of single shield wire .......................................................................... 65

Figure B.2 – Principle of two shield wires ............................................................................ 66

Figure C.1 – IT power distribution system in Norway ............................................................ 68

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IEC 60728-11:2016 © IEC 2016 – 5 –
Figure C.2 – Example of installations located farther than 20 m away from a

transforming station ............................................................................................................ 69

Figure C.3 – Example of installations located closer than 20m from a transforming

station ................................................................................................................................ 70

Figure C.4 – Example of cabinets for cable network with locally fed equipment and

mains placed less than 2 m apart ........................................................................................ 71

Figure C.5 – Example of cabinets for cable network with remotely fed equipment and

mains placed less than 2 m apart ........................................................................................ 71

Figure C.6 – Example of cabinets for cable network with locally fed equipment and

mains placed more than 2 m apart ...................................................................................... 72

Figure C.7 – Example of cabinets for cable network with remotely fed equipment and

mains placed more than 2m apart ....................................................................................... 72

Figure C.8 – Example of an installation placing the amplifier in front of the galvanic

isolator ............................................................................................................................... 73

Figure C.9 – Example of protection using a voltage depending device on network

installations on poles .......................................................................................................... 74

Figure C.10 – Example of the installation of a safety terminal in Japan ................................ 76

Figure C.11 – Examples of installation of a lightning protection system in Japan .................. 77

Table 1 – Maximum allowed operation voltages and maximum recommended currents

for coaxial cables in the EN 50117 series ............................................................................ 33

Table 2 – Solutions for protection of antenna systems against atmospheric

overvoltages ....................................................................................................................... 39

Table B.1 – Conductivity of different types of soil................................................................. 64

Table B.2 – Protection factors (K ) of protection measures against direct lightning

strokes for buried cables ..................................................................................................... 65

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– 6 – IEC 60728-11:2016 © IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
CABLE NETWORKS FOR TELEVISION SIGNALS,
SOUND SIGNALS AND INTERACTIVE SERVICES –
Part 11: Safety
FOREWORD

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International Standard IEC 60728-11 has been prepared by technical area 5: Cable networks

for television signals, sound signals and interactive services, of IEC technical committee 100:

Audio, video and multimedia systems and equipment.

This fourth edition cancels and replaces the third edition published in 2010. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition.

• Correction of minimum cross-section of bonding conductor in Figure 6, Figure 14 and

Figure 17.
• Verbal modification of 11.3.1.2.
---------------------- Page: 8 ----------------------
IEC 60728-11:2016 © IEC 2016
...

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