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BS EN IEC 60728-11:2023

BS EN IEC 60728-11:2023

$215.11

Cable networks for television signals, sound signals and interactive services – Safety

Published By Publication Date Number of Pages
BSI 2023 100
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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.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
7 Annex ZB (informative)A-deviations
8 Annex ZC (normative)Special national conditions
16 Blank Page
17 CONTENTS
21 FOREWORD
23 INTRODUCTION
24 1 Scope
2 Normative references
25 3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
33 3.2 Symbols
3.3 Abbreviated terms
34 4 Fundamental requirements
4.1 General
35 4.2 Mechanical requirements
4.2.1 General
4.2.2 Equipment design and construction
4.2.3 Accessible parts
4.3 Radiation
4.4 Electromagnetic radiation
4.5 Thermal protection
4.6 Safety in case of fire and fire reaction
36 5 Protection against environmental influences
6 Equipotential bonding and earthing
6.1 General requirements
6.2 Equipotential bonding mechanisms
38 Figures
Figure 1 – Example of equipotential bonding and earthing of a metal enclosure inside a non-conductive cabinet for outdoor-use
39 Figure 2 – Example of equipotential bonding of a building installation
40 Figure 3 – Example of equipotential bonding and indirect earthing of a metal enclosure inside a non-conductive cabinet for outdoor-use
42 Figure 4 – Example of equipotential bonding and earthingof a building installation (underground connection)
43 Figure 5 – Example of equipotential bonding and earthing of a building installation (above ground connection)
44 Figure 6 – Example of equipotential bonding with a galvanic isolated cable entering a building (underground connection)
46 Figure 7 – Example of maintaining equipotential bonding whilst a unit is removed
47 6.3 Equipotential bonding in meshed systems
6.3.1 References to other standards
6.3.2 General on AC mains
6.3.3 AC power distribution and connection of the protective conductor
6.3.4 Dangers and malfunction
48 6.3.5 Measures
7 Mains-supplied equipment
49 8 Remote power feeding in cable networks
8.1 Remote power feeding
8.1.1 Maximum allowed voltages
8.1.2 General requirements for equipment
8.1.3 Current-carrying capacity and dielectric strength of the components
Tables
Table 1 – Maximum allowed operation voltages and maximum recommended currents for coaxial cables
50 8.2 Remote powering from subscriber premises
9 Segregation distances and protection against indirect contact to electric power distribution systems
9.1 General
9.2 Overhead lines
9.2.1 Overhead lines up to 1 000 V
9.2.2 Overhead lines above 1 000 V
9.3 House installations up to 1 000 V
51 10 System outlets and transfer points
10.1 General
10.2 System outlet
10.2.1 Types of system outlets
52 10.2.2 Fully isolated system outlet
10.2.3 Semi-isolated system outlet
10.2.4 Non-isolated system outlet with protective element
10.2.5 Non-isolated system outlet without protective element
10.2.6 Fully-isolated system outlet provided by means of a FTTH system
54 10.3 Transfer point
Figure 8 – MDU building installed with FTTH technology
55 11 Protection against atmospheric overvoltages and elimination of potential differences
11.1 General
56 11.2 Protection of the antenna system
11.2.1 Selection of appropriate methods for protection of antenna systems
Figure 9 – Areas of antenna-mounting in oron buildings, where earthing is not mandatory
57 11.2.2 Building equipped with a lightning protection system (LPS)
Table 2 – Solutions for protection of antenna systems against atmospheric overvoltage
59 Figure 10 – Flow chart for selection of the appropriate method for protecting the antenna system against atmospheric overvoltages
60 Figure 11 – Example of equipotential bonded headends and antennas in a protected volume of the building LPS
61 Figure 12 – Example of equipotential bonded headends and antennas in a protected volume of an external horizontally isolated ATS
62 Figure 13 – Example of equipotential bonded headends and antennas in a protected volume of an external vertically isolated ATS
63 Figure 14 – Example of equipotential bonded antennas (not installed in a protected volume) and headend with direct connection to building LPS
64 11.2.3 Building not equipped with an LPS
66 Figure 15 – Example of equipotential bonded headendand earthed antennas (building without LPS)
67 11.3 Earthing and bonding of the antenna system
11.3.1 Internal protection system
Figure 16 – Example of bonding for antennas and headend (building without LPS and lightning risk lower than or equal to the tolerable risk)
68 11.3.2 Earthing conductors
70 11.3.3 Earth termination system
Figure 17 – Example of protecting an antenna system (not installedin a protected volume) by additional bonding conductors (R > RT)
73 Figure 18 – Examples of earthing mechanisms
74 11.4 Overvoltage protection
Figure 19 – Example of an overvoltage protective device for single dwelling unit
75 12 Mechanical stability
12.1 General requirements
12.2 Bending moment
76 Figure 20 – Example of bending moment of an antenna mast
77 12.3 Wind-pressure values
12.4 Mast construction
78 12.5 Data to be published
79 Annex A (normative) Earth loop impedance
A.1 General
A.2 Earthing for fault conditions
80 A.3 Earthing to protect against hazardous touch voltage
Figure A.1 – Systematic of earth loop resistance
81 A.4 Temporary safety measures
82 Annex B (informative) Use of shield wires to protect installations with coaxial cables
B.1 General
B.2 Soil quality determines shield-wiring necessity
B.3 Protective measures against direct lightning strikes on underground cables
Table B.1 – Conductivity of different types of soil
83 Figure B.1 – Principle of single shield wire
Table B.2 – Protection factors (Kp) of protection measures against direct lightning strokes for buried cables
84 Figure B.2 – Principle of two shield wires
85 Annex C (informative) Differences in some countries
C.1 Subclause 6.1
C.1.1 France
C.1.2 Japan
C.2 Subclause 6.2
C.2.1 France
C.2.2 Norway
C.2.3 Japan and Poland
C.3 Subclause 6.3 – Norway
C.3.1 Justification
86 C.3.2 Equipotential bonding mechanism for cable networks
Figure C.1 – IT power distribution system in Norway
87 Figure C.2 – Example of installations located farther than 20 m away from a transforming station
Figure C.3 – Example of installations located closer than 20 m from a transforming station
88 Figure C.4 – Example of cabinets for cable network with locally fed equipment and mains placed less than 2 m apart
89 Figure C.5 – Example of cabinets for cable network with remotely fed equipmentand mains placed less than 2 m apart
90 Figure C.6 – Example of cabinets for cable network with locally fed equipment and mains placed more than 2 m apart
91 C.3.3 Use of galvanic isolation in a cable network with remote power feeding
Figure C.7 – Example of cabinets for cable network with remotely fed equipment and mains placed more than 2 m apart
92 C.3.4 Use of voltage dependent protective device in a cable network
Figure C.8 – Example of an installation placing the amplifier in front of the galvanic isolator
93 C.4 Subclause 8.1.1 – Japan
Figure C.9 – Example of protection using a voltage dependingdevice on network installations on poles
94 C.5 Subclause 9.1 – France
C.6 Subclause 9.2 – Japan
C.7 Subclause 10.1
C.7.1 Sweden
C.7.2 UK
C.8 Subclause 10.2 – Japan
C.9 Subclause 11.1 – Japan
95 C.10 Subclause 11.2
C.10.1 Germany
C.10.2 Japan
Figure C.10 – Example of the installation of a safety terminal in Japan
96 C.11 Subclause 11.3.2 – Japan
C.12 Subclause 11.3.3 – Japan
Figure C.11 – Examples of installation of a lightning protection system in Japan
97 C.13 Subclause 12.2 – Japan
C.14 Subclause 12.3 – Finland
98 Bibliography

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BS EN IEC 60728-11:2023
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