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.<\/p>\n
Additional requirements may be applied, for example, referring to<\/p>\n
electrical installations of buildings and overhead lines,<\/p>\n<\/li>\n
other telecommunication services distribution systems,<\/p>\n<\/li>\n
water distribution systems,<\/p>\n<\/li>\n
gas distribution systems,<\/p>\n<\/li>\n
lightning systems.<\/p>\n<\/li>\n<\/ul>\n
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.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 15<\/td>\n | CONTENTS <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | INTRODUCTION <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 1 Scope 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 3 Terms, definitions, symbols and abbreviations 3.1 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 3.2 Symbols 3.3 Abbreviations <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | 4 Fundamental requirements 4.1 General 4.2 Mechanical requirements 4.3 Accessible parts 4.4 Laser radiation 5 Protection against environmental influences <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | 6 Equipotential bonding and earthing 6.1 General requirements 6.2 Equipotential bonding mechanisms <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | Figures Figure 1 \u2013 Example of equipotential bonding and earthing of a metal enclosure <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | Figure 2 \u2013 Example of equipotential bonding <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | Figure 3 \u2013 Example of equipotential bonding and indirect earthing of the amplifier and the cables via a voltage-dependent protective device <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | Figure 4 \u2013 Example of equipotential bonding and earthing of a building installation (underground connection) <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | Figure 5 \u2013 Example of equipotential bonding and earthing of a building installation (above ground connection) <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | Figure 6 \u2013 Example of equipotential bonding with a galvanic isolated cable entering a building (underground connection) <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | Figure 7 \u2013 Example of maintaining equipotential bonding whilst a unit is removed <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | 6.3 Equipotential bonding in meshed systems <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | 7 Mains-supplied equipment <\/td>\n<\/tr>\n | ||||||
| 39<\/td>\n | 8 Remote power feeding in cable networks 8.1 Remote power feeding <\/td>\n<\/tr>\n | ||||||
| 40<\/td>\n | 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 \u2013 Maximum allowed operation voltages and maximum allowed currents for coaxial cables in different cable network applications <\/td>\n<\/tr>\n | ||||||
| 41<\/td>\n | 9.3 House installations up to 1\u00a0000\u00a0V 10 System outlets and transfer points 10.1 General <\/td>\n<\/tr>\n | ||||||
| 42<\/td>\n | 10.2 System outlet <\/td>\n<\/tr>\n | ||||||
| 43<\/td>\n | 10.3 Transfer point 11 Protection against atmospheric overvoltages and elimination of potential differences 11.1 General <\/td>\n<\/tr>\n | ||||||
| 44<\/td>\n | 11.2 Protection of the antenna system Figure 8 \u2013 Areas of antenna-outdoor-mounting on buildings, where earthing is not mandatory <\/td>\n<\/tr>\n | ||||||
| 45<\/td>\n | Table 2\u00a0\u2013\u00a0Solutions for protection of antenna systems against atmospheric overvoltages <\/td>\n<\/tr>\n | ||||||
| 46<\/td>\n | Figure 9\u00a0\u2013\u00a0Flow chart for selection of the appropriate method for protecting the antenna system against atmospheric overvoltages <\/td>\n<\/tr>\n | ||||||
| 47<\/td>\n | Figure 10\u00a0\u2013\u00a0Example of equipotential bonded headends and antennas in a protected volume of the building LPS <\/td>\n<\/tr>\n | ||||||
| 48<\/td>\n | Figure 11\u00a0\u2013\u00a0Example of equipotential bonded headends and antennas in a protected volume of the building LPS <\/td>\n<\/tr>\n | ||||||
| 49<\/td>\n | Figure 12\u00a0\u2013\u00a0Example of equipotential bonded headends and antennas in a protected volume of an external isolated ATS <\/td>\n<\/tr>\n | ||||||
| 50<\/td>\n | Figure 13 \u2013 Example of equipotential bonded antennas (not installed in a protected volume) and headend with direct connection to building LPS <\/td>\n<\/tr>\n | ||||||
| 53<\/td>\n | Figure 14 \u2013 Example of equipotential bonded headend and earthed antennas (building without LPS) <\/td>\n<\/tr>\n | ||||||
| 54<\/td>\n | Figure 15 \u2013 Example of bonding for antennas and headend (building without LPS and lightning risk lower than or equal to the tolerable risk) <\/td>\n<\/tr>\n | ||||||
| 55<\/td>\n | 11.3 Earthing and bonding of the antenna system <\/td>\n<\/tr>\n | ||||||
| 57<\/td>\n | Figure 16\u00a0\u2013\u00a0Example of protecting an antenna system (not installed in a protected volume) by additional discharge conductors (R \uf03e RT) <\/td>\n<\/tr>\n | ||||||
| 59<\/td>\n | Figure 17 \u2013 Examples of earthing mechanisms (minimum dimensions) <\/td>\n<\/tr>\n | ||||||
| 60<\/td>\n | 11.4 Overvoltage protection Figure 18 \u2013 Example of an overvoltage protective device for single dwelling unit <\/td>\n<\/tr>\n | ||||||
| 61<\/td>\n | 12 Mechanical stability 12.1 General requirements 12.2 Bending moment Figure 19 \u2013 Example of application of a coaxial overvoltage protective device for multiple dwelling unit <\/td>\n<\/tr>\n | ||||||
| 62<\/td>\n | Figure 20 \u2013 Example of bending moment of an antenna mast <\/td>\n<\/tr>\n | ||||||
| 63<\/td>\n | 12.3 Wind-pressure values 12.4 Mast construction <\/td>\n<\/tr>\n | ||||||
| 64<\/td>\n | 12.5 Data to be published <\/td>\n<\/tr>\n | ||||||
| 65<\/td>\n | Annex A (informative) Earth loop impedance <\/td>\n<\/tr>\n | ||||||
| 66<\/td>\n | Figure A.1\u00a0\u2013\u00a0Systematic of earth loop resistance <\/td>\n<\/tr>\n | ||||||
| 68<\/td>\n | Annex B (informative) Use of shield wires to protect installations with coaxial cables Table B.1 \u2013 Conductivity of different types of soil <\/td>\n<\/tr>\n | ||||||
| 69<\/td>\n | Table B.2 \u2013 Protection factors (Kp) of protection measures against direct lightning strokes for buried cables <\/td>\n<\/tr>\n | ||||||
| 70<\/td>\n | Figure B.1 \u2013 Principle of single shield wire Figure B.2 \u2013 Principle of two shield wires <\/td>\n<\/tr>\n | ||||||
| 71<\/td>\n | Annex C (informative) Examples of calculation of risk due to lightning Figure C.1 \u2013 Template for calculation of the risk due to lightning (Example No. 1) <\/td>\n<\/tr>\n | ||||||
| 73<\/td>\n | Figure C.2 \u2013 Template for calculation of the risk due to lightning (Example No. 2) <\/td>\n<\/tr>\n | ||||||
| 74<\/td>\n | Annex D (informative) The following differences exist in some countries <\/td>\n<\/tr>\n | ||||||
| 75<\/td>\n | Figure D.1\u00a0\u2013\u00a0IT power distribution system in Norway <\/td>\n<\/tr>\n | ||||||
| 76<\/td>\n | Figure\u00a0D.2\u00a0\u2013\u00a0Example of installations located farther than 20\u00a0m away from a transforming station Figure\u00a0D.3\u00a0\u2013\u00a0Example of installations located closer than 20m from a transforming station <\/td>\n<\/tr>\n | ||||||
| 77<\/td>\n | Figure\u00a0D.4\u00a0\u2013\u00a0Example of cabinets for cable network with locally fed equipment and mains placed less than 2 m apart Figure\u00a0D.5\u00a0\u2013\u00a0Example of cabinets for cable network with remotely fed equipment and mains placed less than 2 m apart <\/td>\n<\/tr>\n | ||||||
| 78<\/td>\n | Figure\u00a0D.6\u00a0\u2013\u00a0Example of cabinets for cable network with locally fed equipment and mains placed more than 2 m apart Figure\u00a0D.7\u00a0\u2013\u00a0Example of cabinets for cable network with remotely fed equipment and mains placed more than 2m apart <\/td>\n<\/tr>\n | ||||||
| 79<\/td>\n | Figure\u00a0D.8\u00a0\u2013\u00a0Example of an installation placing the amplifier in front of the galvanic isolator <\/td>\n<\/tr>\n | ||||||
| 80<\/td>\n | Figure\u00a0D.9\u00a0\u2013\u00a0Example of protection using a voltage depending device on network installations on poles <\/td>\n<\/tr>\n | ||||||
| 82<\/td>\n | Figure D.10 \u2013 Example of the installation of a safety terminal in Japan <\/td>\n<\/tr>\n | ||||||
| 83<\/td>\n | Figure D.11 \u2013 Examples of installation of a lightning protection system in Japan <\/td>\n<\/tr>\n | ||||||
| 85<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Cable networks for television signals, sound signals and interactive services – Safety<\/b><\/p>\n |