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Nova430i Outdoor 4x250mW Two-Carrier TDD eNodeB Installation Guide
3.4.2 Pole Grounding
The purpose of pole grounding is to protect the equipment as much as possible from the potential damage
of lightning overvoltage. However, the interfaces between the eNB and the outside world mainly include
a 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 3-11.
Figure 3-11: 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 12 in (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,
12 x 1.5 x 0.16 in (300 × 40 × 4 mm) and fixed with expansion bolts.
5. The grounding wire must be made of the whole cable material, the intermediate joint is strictly
prohibited, and the excess length should be cut. The skin shall be complete, and the insulation
resistance of the core wire to the ground (or metal isolation layer) shall meet the technical
requirements of the cable.
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