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3.4.2 Pole Grounding
The purpose of pole grounding is to protect the equipment as much as possible from potential
damage of lightning overvoltage. However, the interfaces between the eNB and the outside world
mainly include power system, grounding system, antenna feeder and lightning receiving device,
and signal line. Therefore, any damage caused by lightning primarily comes from the voltage
difference between the equipment in the eNB and one or more of the four interfaces. The pole
grounding is shown in Figure 3-9.
Figure 3-9: Pole Grounding
1.
The installation position of the grounding bar should meet the design requirements. The
holding pole and tower body must be connected to the lightning protection network, or
grounded with a separate lead.
2.
The diameter of the grounding wire should meet the design requirements. The copper nose
must be used for grounding, and the grounding resistance is required to be less than 10 ohms.
If the resistance of the public network communication equipment placed in other systems is
less than 10 ohms, the grounding network of the system should be overlapped.
3.
The grounding wire must be the whole wire material. When laying, it should be bound
separately with other cables. All grounding wires should be fixed with wire core or binding
tape with a fixed spacing of 0.3 m.
4.
The copper bar must be used for the grounding bar, and the specification of the grounding bar
shall meet the design requirements. If there are no specific requirements in the design, 300 ×
40 × 4 mm and fixed with expansion bolts.
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