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HUAWEI NIP6800 Series V500 Hardware Guide

This document of the NIP6800 Series describes hardware structure, installation guide, and hardware maintenance. The content of this document includes the appearance and specifications of the product, the supported expansion cards, preparation before the installation, installation, cabling, and hardware replacement.
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Requirements for Lightning Proof Grounding

Requirements for Lightning Proof Grounding

Table 4-13 describes requirements for lightning proof grounding.
Table 4-13  Requirements for lightning proof grounding



Capital construction

Use reinforced concrete in equipment room construction

Install the lightning proof device like a lightning rod in the room.

The lightning proof ground shares the same grounding body with the room's protection ground.

TN-S power system

Use a special power transformer on the telecommunication site. Use a metal jacket or steel tube to cover the power cables before burying them under the ground. Properly ground both ends of the metal jacket or steel tube nearby with the buried length less than 15 m.

Install a gapless zinc oxide arrester to each of the three phase lines at the low-voltage side of the AC power transformer. Nearby, properly ground the transformer enclosure, the neutral lines at the low-voltage side, and the metal steel tubes of the power cables that are connected to the transformer enclosure.

Lightning arrester requirements (for power cables leading in the communications site)

Do not lead the AC/DC power cables in/out the communications site in aerial mode.

After the low-voltage power cables are led into the room, install the lightning arrester for the power cables in the AC voltage stabilizer and the AC power distribution panel (box). Properly ground the arrester nearby.

For equipment rooms in mountain areas that are susceptible to lightning strike and equipment rooms in separate high-rise buildings cities, install a power supply arrester with a nominal discharging current larger than 100 kA.

The PGND cable of the lightning arrester should not exceed 1 m in length.

Grounding of DC power distribution

Connect the DC working ground (positive pole of the -48 V DC power supply or the negative pole of the 24 V DC power supply) with the indoor collective PGND cable nearby. The PGND cable should meet maximum load requirements for the equipment.

The power equipment must have a DC working PGND cable, which can connect the power equipment to the collective PGND cable of the telecommunication site (or the protection ground bar of the equipment room).

Equipotential connection

Properly ground the devices and auxiliary devices in the room such as mobile base station, transmission, switching equipment, power supply equipment, and cable distribution frame. Connect all protection PGND cables to the collective protection ground bar. Connect all protection PGND cables in one equipment room to one protection ground bar.

Apply joint grounding to the working ground and protection ground of devices such that the two share one grounding network.

The cabling rack, shell, metal ventilation pipe, metal door, or window on the equipment should be grounded for protection.

General grounding

Do not connect the neutral line of the AC power cable with the protection ground of any telecom equipment in the equipment room.

Do not install the fuse or switch on the PGND cable.

All PGND cables should be as short and routed as straight as possible.

Grounding resistance

The grounding resistance must be lower than 1 ohm.

The upper end of the grounding body should be at least 0.7 m above the ground. In cold areas, bury the grounding body below the frozen ground.

Measure the grounding resistance periodically to ensure effective grounding.

Signal cable routing

Do not arrange the signal cables overhead in the equipment room. All signal cables must be led into the site underground.

Use cables with metal jackets or place them into a metal pipe if they come out/in the equipment room.

Keep the PGND cable of the lightning arrester as short as possible. Ground the idle lines inside the cable in the equipment room.

Collective ground cable

Use the grounding ring or ground bar for the collective ground cable.

Do not use aluminum cables as ground cables. Adopt measures to prevent electrification corrosion when connecting different metal parts together.

Use the copper busbar as the collective ground cable a the cross-sectional area not less than 120 mm2. Alternatively, use the galvanized flat steel with the same resistance. Insulate the collective ground cable from the reinforcing steel bars of the building.

Grounding lead-in

The grounding lead-in should not exceed 30 m long in length. Use galvanized flat steel with a cross-sectional area of 4 0 mm x 4 mm or 50 mm x 5 mm.

Updated: 2019-01-04

Document ID: EDOC1100059253

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