What's Grounding Requirements for the Server

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The server and supporting equipment (such as mobile base stations, switches, and power supplies) in the TR should be grounded. The PGND cables of the equipment in the communication office should be finally connected to the total ground bar.

PGND cables of the equipment in a line should be connected to the ground bar of the first cabinet. PGND cables of the equipment not in a line but in the same TR should be connected to the protection ground bar of the TR.

The -48 V power cable that is led out from the -48 V power input terminal of the server should be connected to the -48 V bus bar of the power cabinet or power distribution cabinet that is provided and used by the customer. Similarly, the RTN cable that is led out from the RTN power input terminal should be connected to the RTN bus bar.

The PGND cable that is led out from the total ground terminal of the server should be connected to the nearest protection ground bar that is provided and used by the customer.

NOTE:
If the server is powered by a power distribution cabinet, the PGND cable that is led out from the total ground terminal of the cabinet should be connected to the protection ground bar of the power distribution cabinet.
If the server is powered by a power cabinet, the PGND cable that is led out from the total ground terminal of the cabinet should be connected to the nearest protection ground bar of the power cabinet or that of the TR.

Other related questions:
What's Generic Grounding Requirements for the Proper Running of the server
The design for grounding should follow the principles of equal voltage and equal potential. In other words, the working grounding and protection grounding, including the shielded grounding and the surge protection grounding of the cable distribution frame are jointly grounded at the same grounding body set. Any uncharged metal objects in the TR, such as cable troughs, cable trays, cabinets, racks, shells, metal ventilation pipes, and metal doors and windows, should be grounded. The ground cable must be directly connected to the protection ground bar of the TR. The PGND cable should be a green-and-yellow insulated cable. NOTE: In North America, the PGND cable should be a green insulated cable. To decrease high-frequency impedance, copper, rather than aluminum, should be used as the conductor of the ground cable and the ground cable should be thick and short as much as possible. Ground connection should meet the following requirements: The joint face is conductive and cannot be painted. The joint face is clean. Surface contact should be used in connection and the connection area should meet the requirement for through-current capability. Connecting parts should be fixed securely. It is recommended that the same metal be used as connecting parts, because this prevents electrochemical corrosion. The PGND cable does not have any joint and no switch or fuse is installed on it. The AC neutral wire must not be used as a PGND cable. The cabinet shell and PGND cable must be insulated from the neutral wire of the AC power supply.

What's Grounding Requirements Inside the Cabinet for the Proper Running of the server
At least one ground terminal at the front door, rear door, and side panel of the cabinet should be properly connected to the ground terminal of the cabinet. At least one ground terminal at the shell of the shelf and power box (or power distribution box) should be properly connected to the ground terminal of the cabinet.

What's Grounding Requirements for Maintenance Terminals
If an AC-powered maintenance terminal communicates with the monitored server only over an Ethernet port, the maintenance terminal can be grounded by connecting the PE cable in its three-core cord to the PE end of the mains supply. After grounding a maintenance terminal, use a multimeter to check the voltage or current at the connection between the maintenance terminal and the PE end of the AC power supply, ensuring a reliable electrical connection. If an AC-powered maintenance terminal communicates with the monitored DC-powered server over a non-Ethernet ports, for example, an RS232 port or RS422 port, the maintenance terminal should be grounded by connecting its PGND cable to any of the following ground devices: Protection ground bar of the TR Power distribution cabinet that supplies power to the server Protection ground bar in the cabinet provided by the customer To disconnect the grounding connection between the three-core cord and the mains supply, break the PE prong of the plug and then insert the plug into an AC socket. If the server monitored by an AC-powered maintenance terminal is powered by an AC power supply, the maintenance terminal can be grounded by connecting the PE cable in its three-core cord to the PE end of the mains supply. After grounding a maintenance terminal, use a multimeter to check the voltage or current at the connection between the maintenance terminal and the PE end of the AC power supply, ensuring a reliable electrical connection. If a maintenance terminal is powered by an uninterruptible power supply (UPS) or an inverter, the shell of the UPS or inverter should be directly connected to the protection ground bar of the TR or the power distribution cabinet. The maintenance terminal can be grounded by connecting the PE cable of the three-core cord of the UPS or inverter to the PE end of the mains supply. If the maintenance terminal is powered by a DC power supply, the shell of the maintenance terminal should be connected to the protection ground bar of the TR, the power distribution cabinet, or the cabinet provided by the customer, or be connected to the ground terminal of the server, over a PGND cable.

What's Grounding Requirements for the TR Building
It is recommended that reinforced concrete be applied to the construction of the TR. The TR should be equipped with surge protectors, such as lightning rods. The surge protection grounding of the TR should share the same grounding body as the protection grounding of the TR. The grounding resistance of the TR or communication office should not be greater than 10 ohms and should comply with local and national industry standards. The grounding resistance should be measured periodically to ensure effective grounding.

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