How should a lightning protection System (RBS) be formed?

The earthing network of an RBS should be formed by a ring loop surrounding the tower, equipment room and fence, at a minimum. The mean radius re of this ring loop should be not less than l1, as indicated in Figure 1 and this value depends on the lightning protection system (LPS) class and on the soil resistivity.

What is a radio base station (RBS) earthing network?

The most important objective of the radio base station (RBS) earthing network is to minimize the differences in potential between the conductive parts within the RBS site (equipotential bonding), which is beneficial for the safety, lightning protection and electromagnetic compatibility (EMC) performance of the equipment.

How to protect the navigation light system in the equipment room?

Figure 12 shows protection of the navigation light system in the equipment room. If the NL has internal control circuits or it is based on LED technology, then an SPD is required on the top of the tower to protect the lamp. This SPD can be integrated into the lamp box.

Can a navigation light monitoring unit be installed in a PDB?

Refer to [IEC 61643-12] for the relevant information. If the NL is directly powered by PDB in the equipment room, an SPD should be integrated into the PDB. The bonding conductor of the PDB is recommended to be shorter than 1 m. The protection module of the navigation light monitoring unit can be installed in the NLCB or in the PDB.

What is the bonding configuration B in the equipment room?

The bonding configuration B in the equipment room is illustrated in Figures 10 and 11. The bonding configuration B uses a bonding ring instead of an indoor earthing bar. All equipment are connected to the bonding ring by using bonding conductors. Most of the equipment are installed below the indoor cable tray.