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
6.2 External lightning protection system
6.3 Earthing and bonding network outside equipment room
6.4 Bonding configuration inside the equipment room
6.5 Protection of the navigation light system
6.6 Protection of AC power supplies at the tower
7 Lightning protection, earthing and bonding of a rooftop RBS
7.1 Earthing network
7.2 Down-conductors of a rooftop RBS
7.3 Air-termination system of buildings
7.4 Rooftop bonding network
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
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.3 Three-point method for the measurement of earthing resistance
B.4 Single clamp / double clamp method for the
measurement of earthing resistance
Bibliography