1 Scope and purpose
2 References
3 Definitions
4 Abbreviations
5 Reference configuration
6 Need of protection
7 Probabilistic analysis
7.1 Tolerable frequency of damage (Ft)
7.2 Frequency of strikes to the tower (Fa)
7.3 Frequency of strikes to the RBS housing (Fd)
7.4 Analysis of the frequency of strikes
8 Determination of the lightning current parameters
9 Protection procedures in LPZ0
9.1 Procedures
applied to the tower
9.2 Earthing system
10 Protection
procedures for the cables that come from the tower
11 Protection
against the lightning effects inside the housing
11.1 Shielding factor (h)
11.2 Mesh-BN
configuration
11.3 Mesh-IBN configuration
11.4 Protection procedures at the boundary between LPZ1 and LPZ2
12 Protection
against the lightning effects at the services entrances
12.1 Power service
12.2 Telecommunication service
Annex A – Factor for current distribution along a tower
(a)
A.1 Tubular tower
A.2 Three legs tower
A.3 Four legs tower
Annex B – Shielding factor (h) for CBN loops
Annex C – Transfer factor (b) for cable trays and earth conductors
C.1 Single earth conductor
C.2 Double earth conductors
C.3 Earth plate tray
Annex D – Geometric mean radius
Appendix I – Rationale for effective front time
Appendix II – Example of application