Recommendation ITU-T K.112 (05/2021) Lightning protection, earthing and bonding: Practical procedures for radio base stations
Summary
History
Keywords
FOREWORD
Table of Contents
1 Scope
2 References
3 Definitions
     3.1 Terms defined elsewhere
     3.2 Terms defined in this Recommendation
4 Abbreviations and acronyms
5 Conventions
6 Lightning protection and earthing of tower RBS
     6.1 Earthing network of a tower site
          6.1.1 Mean radius of an RBS earthing network
          6.1.2 The structure of an RBS earthing network
          6.1.3 The earthing material
          6.1.4 Protection against corrosion
          6.1.5 Site in rocky area
     6.2 External lightning protection system
          6.2.1 Protection zone of air-termination system
          6.2.2 Down-conductor material
          6.2.3 Installation of the air-termination system
          6.2.4 Lightning down-conductor
          6.2.5 Anti-corrosion measures
     6.3 Earthing and bonding network outside equipment room
          6.3.1 Feeder tray
          6.3.2 The facilities and equipment on the tower
          6.3.3 The cable along the tower
          6.3.4 The connection of the down-conductor and earthing network
     6.4 Bonding configuration inside the equipment room
          6.4.1 Bonding configuration A
          6.4.2 Bonding configuration B
     6.5 Protection of the navigation light system
          6.5.1 Navigation light equipment in the equipment room
          6.5.2 Navigation lights on the tower top
          6.5.3 The cable connected to the NL
          6.5.4 The current capability of SPD for NLCB and NL
     6.6 Protection of AC power supplies at the tower
          6.6.1 Installing a Class I SPD outside the ACDB
          6.6.2 Installing a Class I SPD inside the ACDB
7 Lightning protection, earthing and bonding of a rooftop RBS
     7.1 Earthing network
          7.1.1 Sharing the earthing network of the building
          7.1.2 Use of the concrete steelwork of the building as an earthing network
          7.1.3 New earthing network for a rooftop RBS
     7.2 Down-conductors of a rooftop RBS
          7.2.1 Sharing the down-conductors of the building
          7.2.2 Use of the reinforced building steelwork as a natural down-conductor
          7.2.3 New down-conductors of the rooftop RBS
     7.3 Air-termination system of buildings
          7.3.1 The need for an LPS
          7.3.2 Responsibility for construction of the building air-termination system
          7.3.3 Lightning protection facilities that protect the RBS on the roof
     7.4 Rooftop bonding network
          7.4.1 Rooftop bonding network available
          7.4.2 Rooftop bonding network unavailable
     7.5 Bonding configuration inside the equipment room
     7.6 The equipment room in the building
     7.7 Protection of AC power supplies of a rooftop RBS
8 Circuit diagram and current capability of Class I/II SPD
     8.1 SPD configuration for three-phase AC power supply
     8.2 SPD configuration solution for two-phase AC power supply
     8.3 SPD configuration for single-phase AC power supply
     8.4 Specification of SPDs
9 Protection of antenna system
     9.1 Arrangement 1
          9.1.1 Air termination
          9.1.2 Earthing and bonding
          9.1.3 Resistibility
     9.2 Arrangement 2
          9.2.1 Earthing and bonding
          9.2.2 Resistibility
     9.3 Arrangement 3
          9.3.1 Earthing and bonding
          9.3.2 Resistibility
Annex A  Example of earthing network design of a tower site
     A.1 Example where additional earthing electrodes are necessary
     A.2 Example where additional earthing electrodes are not necessary
Annex B  Earthing resistance and soil resistivity test guide
     B.1 General requirements for measurement
     B.2 Four-point method for the measurement of earthing resistivity
          B.2.1 Measurement method for earthing resistivity
     B.3 Three-point method for the measurement of earthing resistance
     B.4 Single clamp / double clamp method for the measurement of earthing resistance
          B.4.1 Single clamp method for measuring the earthing resistance
          B.4.2 Double clamp method for measuring the earthing resistance
          B.4.3 The scenarios for using a clamp meter
Bibliography