### 2.3.6 Grounding

A proper grounding system is crucial for ensuring stable and reliable operation, as well as preventing lightning strikes and interference. Carefully check the grounding conditions at the installation site according to the grounding requirements, and complete grounding properly based on the site situation.

l Safety Grounding

Ensure that the equipment is securely grounded using grounding wires if the equipment uses the AC power supply. Otherwise, electric shocks may occur when the insulation resistance between the power module and the chassis decreases.

Caution

l The building should provide a protective ground connection to ensure that the equipment is connected to a protective ground.

l The O&M personnel should verify whether the AC socket is reliably connected to the protective ground of the building. If not, the O&M personnel should use a protective grounding wire to connect the protective grounding lug of the AC socket to the protective ground of the building.

l The power socket should be installed near the equipment and easily accessible.

l During the equipment installation, connect the grounding wire first and disconnect it last.

l The cross-sectional area of the protective grounding cable should be at least 0.75 mm2 (18 AWG).

l Install the equipment by using 3-core power cords, with a minimum cross-sectional area of 0.75 mm2 or 18 AWG per pin.

l Lightning Grounding

The lightning protection system is an independent system composed of a lightning rod, a downlead conductor, and a connector connected to the grounding system. The grounding system is typically used for power reference grounding and safety grounding of the rack. Lightning grounding is required only for facilities, and is not required for the equipment.

Note

For surge protection, see 6.3 Surge Protection.

l EMC Grounding

Grounding required for electromagnetic compatibility includes shielded grounding, filter grounding, noise and interference suppression, and level reference, which contribute to the overall grounding requirements.

The grounding resistance should be smaller than 1 ohm. The switch provides one grounding stud on the back panel.