1、 IEC 60728-11 Edition 4.0 2016-03 INTERNATIONAL STANDARD NORME INTERNATIONALE Cable networks for television signals, sound signals and interactive services Part 11: Safety Rseaux de distribution par cbles pour signaux de tlvision, signaux de radiodiffusion sonore et services interactifs Partie 11: S
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19、iec.ch/csc Si vous dsirez nous donner des commentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 60728-11 Edition 4.0 2016-03 INTERNATIONAL STANDARD NORME INTERNATIONALE Cable networks for television signals, sound signals and interactive services Part 11: Sa
20、fety Rseaux de distribution par cbles pour signaux de tlvision, signaux de radiodiffusion sonore et services interactifs Partie 11: Scurit INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS 33.060.40 ISBN 978-2-8322-3161-6 Registered trademark of the Internation
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22、8-11:2016 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 Acces
23、sible 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
24、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 req
25、uirements 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 lin
26、es 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
27、.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 IEC 60728-11:2016 IEC 2016 3 10.3 Transfer point . 36 11 Protection against atmospheric overvoltages an
28、d 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.
29、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
30、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 i
31、nstallations 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 Jap
32、an 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 vol
33、tage 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 4 IEC 60728-11:2016 IEC 2016 C.9 Subclause 11.1 Japan 76 C.10 Subclause
34、 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
35、 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 install
36、ation (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
37、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 a
38、tmospheric 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
39、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 LP
40、S) . 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 T ) . 53 Figure 18 Exam
41、ples 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
42、 B.2 Principle of two shield wires 66 Figure C.1 IT power distribution system in Norway 68 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 st
43、ation 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 loca
44、lly 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 pro
45、tection 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
46、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 p ) of protection measures against direct lightning strokes for buried
47、 cables . 65 6 IEC 60728-11:2016 IEC 2016 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 comprisi
48、ng all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standard
49、s, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non- gover
