Surge Protector on a Fixed Huawei Switch

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Hi my good friend,

Surge protectors can be used under the following conditions:

Service port surge protection:

• If power and network cables of a switch need to be routed outdoors, bury them underground or put them in steel pipes to protect the switch from lightning strikes.

• If the network ports on the S5720I-SI series switches are connected to devices on a street pole, no surge protector needs to be installed. If the network ports are connected to devices on a tower, a network port surge protector must be installed.

• To protect network ports from lightning, use 8-line surge protectors or Huawei certified 4-line surge protectors. Connect the IN ports to terminals and the OUT ports to network ports of the switch.

• If fiber reinforcing ribs are used, ensure that they are properly grounded to protect the switches from lightning.

Power supply surge protection

When installing the S5720I-SI series switches in outdoor cabinets, ensure that the following requirements are met:

• AC switch:

  • If the 220 V mains supply is used, install a 20 kA surge protector between the power port of the switch and the mains.

  • If power is supplied by an isolated inverter near the outdoor cabinet, no surge protector needs to be installed between the power port of the switch and the inverter.

• DC switch: An isolated power supply must be used and placed in the same outdoor cabinet as the switch. Surge protection is required for the power input of the outdoor cabinet. The surge protector, power supply, and switch must be equipotential. The outdoor cabinet must be properly grounded and the grounding impedance must be less than or equal to 10 ohms. If a DC switch is connected to the PAC-260WA-E or PAC240S56-CN power module that is powered by the 220 V mains, install a 20 kA surge protector between the power input port of the PAC-260WA-E or PAC240S56-CN and the mains.

I hope it helpful!

Hi hemin88,

Common Causes of Lightning Strikes

• Outdoor network cables or power cables are routed overhead.

• The switch is deployed outdoors but is not properly grounded.

Damages Caused by Lightning Strikes

• If power cables of a switch are routed overhead in an outdoor environment, lightning strikes may burn the power supplies.

• If network cables of a switch are routed overhead in an outdoor environment, lightning strikes may burn network ports of the switch.

Most lightning damages occur because lightning-induced current surges generated on Ethernet cables or power cables enter switches through signal ports. If the lightning strike energy exceeds the protection specifications of switches, such lightning damages cannot be avoided using general equipment surge protection measures such as installing a lightning rod or grounding the chassis. Surge protectors are recommended to protect switches against lightning damages.

Surge Protector Use Precautions

Take the following precautions to protect a switch from lightning:

• Ensure that the ground cable is connected to a ground bar or a ground point on the cabinet.

• Avoid routing cables overhead in an outdoor environment. Bury cables underground or route them in steel tubes.

• To protect network ports from lightning, use 8-line surge protectors (or Huawei certified 4-line surge protectors. Non-certified 4-line surge protectors may turn common-mode surges into differentiated mode due to defects in product designs, and cannot protect network ports effectively).

• When installing a network port surge protector, connect the IN end to terminals and the OUT end to the network ports of the switch.

I hope it helps!