BS EN 60728-11:2010
$215.11
Cable networks for television signals, sound signals and interactive services – Safety
| Published By | Publication Date | Number of Pages |
| BSI | 2010 | 88 |
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
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electrical installations of buildings and overhead lines,
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other telecommunication services distribution systems,
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water distribution systems,
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gas distribution systems,
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lightning systems.
This standard is intended to provide 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 |
|---|---|
| 15 | CONTENTS |
| 18 | INTRODUCTION |
| 19 | 1 Scope 2 Normative references |
| 20 | 3 Terms, definitions, symbols and abbreviations 3.1 Terms and definitions |
| 26 | 3.2 Symbols 3.3 Abbreviations |
| 27 | 4 Fundamental requirements 4.1 General 4.2 Mechanical requirements 4.3 Accessible parts 4.4 Laser radiation 5 Protection against environmental influences |
| 28 | 6 Equipotential bonding and earthing 6.1 General requirements 6.2 Equipotential bonding mechanisms |
| 29 | Figures Figure 1 – Example of equipotential bonding and earthing of a metal enclosure |
| 30 | Figure 2 – Example of equipotential bonding |
| 31 | Figure 3 – Example of equipotential bonding and indirect earthing of the amplifier and the cables via a voltage-dependent protective device |
| 32 | Figure 4 – Example of equipotential bonding and earthing of a building installation (underground connection) |
| 33 | Figure 5 – Example of equipotential bonding and earthing of a building installation (above ground connection) |
| 34 | Figure 6 – Example of equipotential bonding with a galvanic isolated cable entering a building (underground connection) |
| 36 | Figure 7 – Example of maintaining equipotential bonding whilst a unit is removed |
| 37 | 6.3 Equipotential bonding in meshed systems |
| 38 | 7 Mains-supplied equipment |
| 39 | 8 Remote power feeding in cable networks 8.1 Remote power feeding |
| 40 | 8.2 Remote powering from subscriber premises 9 Protection against contact and proximity to electric power distribution systems 9.1 General 9.2 Overhead lines Tables Table 1 – Maximum allowed operation voltages and maximum allowed currents for coaxial cables in different cable network applications |
| 41 | 9.3 House installations up to 1 000 V 10 System outlets and transfer points 10.1 General |
| 42 | 10.2 System outlet |
| 43 | 10.3 Transfer point 11 Protection against atmospheric overvoltages and elimination of potential differences 11.1 General |
| 44 | 11.2 Protection of the antenna system Figure 8 – Areas of antenna-outdoor-mounting on buildings, where earthing is not mandatory |
| 45 | Table 2 – Solutions for protection of antenna systems against atmospheric overvoltages |
| 46 | Figure 9 – Flow chart for selection of the appropriate method for protecting the antenna system against atmospheric overvoltages |
| 47 | Figure 10 – Example of equipotential bonded headends and antennas in a protected volume of the building LPS |
| 48 | Figure 11 – Example of equipotential bonded headends and antennas in a protected volume of the building LPS |
| 49 | Figure 12 – Example of equipotential bonded headends and antennas in a protected volume of an external isolated ATS |
| 50 | Figure 13 – Example of equipotential bonded antennas (not installed in a protected volume) and headend with direct connection to building LPS |
| 53 | Figure 14 – Example of equipotential bonded headend and earthed antennas (building without LPS) |
| 54 | Figure 15 – Example of bonding for antennas and headend (building without LPS and lightning risk lower than or equal to the tolerable risk) |
| 55 | 11.3 Earthing and bonding of the antenna system |
| 57 | Figure 16 – Example of protecting an antenna system (not installed in a protected volume) by additional discharge conductors (R RT) |
| 59 | Figure 17 – Examples of earthing mechanisms (minimum dimensions) |
| 60 | 11.4 Overvoltage protection Figure 18 – Example of an overvoltage protective device for single dwelling unit |
| 61 | 12 Mechanical stability 12.1 General requirements 12.2 Bending moment Figure 19 – Example of application of a coaxial overvoltage protective device for multiple dwelling unit |
| 62 | Figure 20 – Example of bending moment of an antenna mast |
| 63 | 12.3 Wind-pressure values 12.4 Mast construction |
| 64 | 12.5 Data to be published |
| 65 | Annex A (informative) Earth loop impedance |
| 66 | Figure A.1 – Systematic of earth loop resistance |
| 68 | Annex B (informative) Use of shield wires to protect installations with coaxial cables Table B.1 – Conductivity of different types of soil |
| 69 | Table B.2 – Protection factors (Kp) of protection measures against direct lightning strokes for buried cables |
| 70 | Figure B.1 – Principle of single shield wire Figure B.2 – Principle of two shield wires |
| 71 | Annex C (informative) Examples of calculation of risk due to lightning Figure C.1 – Template for calculation of the risk due to lightning (Example No. 1) |
| 73 | Figure C.2 – Template for calculation of the risk due to lightning (Example No. 2) |
| 74 | Annex D (informative) The following differences exist in some countries |
| 75 | Figure D.1 – IT power distribution system in Norway |
| 76 | Figure D.2 – Example of installations located farther than 20 m away from a transforming station Figure D.3 – Example of installations located closer than 20m from a transforming station |
| 77 | Figure D.4 – Example of cabinets for cable network with locally fed equipment and mains placed less than 2 m apart Figure D.5 – Example of cabinets for cable network with remotely fed equipment and mains placed less than 2 m apart |
| 78 | Figure D.6 – Example of cabinets for cable network with locally fed equipment and mains placed more than 2 m apart Figure D.7 – Example of cabinets for cable network with remotely fed equipment and mains placed more than 2m apart |
| 79 | Figure D.8 – Example of an installation placing the amplifier in front of the galvanic isolator |
| 80 | Figure D.9 – Example of protection using a voltage depending device on network installations on poles |
| 82 | Figure D.10 – Example of the installation of a safety terminal in Japan |
| 83 | Figure D.11 – Examples of installation of a lightning protection system in Japan |
| 85 | Bibliography |
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IEC 60728-11:2010
Cable networks for television signals, sound signals and interactive services – Part 11: Safety Published…
