Emi; Lightning Protection - H3C WSG1840X Installation Manual

Figure1-1 Attaching an ESD wrist strap
(1) Alligator clip

EMI

All electromagnetic interference (EMI) sources, from outside or inside of the device and application
system, adversely affect the device in the following ways:
•
A conduction pattern of capacitance coupling.
•
Inductance coupling.
•
Electromagnetic wave radiation.
•
Common impedance (including the grounding system) coupling.
To prevent EMI, perform the following tasks:
•
If AC power is used, use a single-phase three-wire power receptacle with protection earth (PE)
to filter interference from the power grid.
•
Keep the device far away from radio transmitting stations, radar stations, and high-frequency
devices.
•
Use electromagnetic shielding, for example, shielded interface cables, when necessary.
•
To prevent signal ports from getting damaged by overvoltage or overcurrent caused by lightning
strikes, route interface cables only indoors. If you must route interface cables outdoors, install
network port lightning protectors.

Lightning protection

Lightning strikes might damage the device when the lightning strike intensity exceeds a certain limit.
To better protect the device from lightning, follow these guidelines:
(2) ESD wrist strap
4
(3) Lock