Electromagnetic Environment; Lightning Protection - Huawei Quidway Eudemon 200 Installation Manual

Installation Manual
Quidway Eudemon 200 Firewall
On the communication network connected to the equipment, the static electricity is
primarily introduced from the outside electrical fields, such as the outdoor high-voltage
power cable and lightning, and from the inside system, such as indoor environment,
floor material and the equipment frame. To avoid the damage caused by the static
electricity, you should ensure that:
The equipment is well connected to earth.
The equipment room is dust-proof.
Keep adequate temperature and humidity.
Wear the ESD-preventive wrist strap and clothes when contacting the circuit
board.
Place the removed circuit board upward on the ESD-preventive workbench, or into
a static shielded bag.
Hold the circuit board by the outer edge when observing or moving it, so as to
avoid direct contact with the elements on it.

2.1.3 Electromagnetic Environment

All interference sources, no matter from the outside of the equipment or the application
system, or from the inside, will influence the equipment negatively in the conduction
patterns of capacitance coupling, inductance coupling, electromagnetic wave radiation,
and common impedance (including grounding system) coupling. To prevent the
interference, you should:
Take effective measures against electricity network interference with the power
supply system.
Do not use the working ground of the equipment together with the grounding or
lightning protection grounding device of the power equipment. Separate them as
far as possible.
Keep the equipment far away from strong power wireless launchers, radar
launchers and high frequency and high-current equipment.
Use electromagnetic shielding if necessary.

2.1.4 Lightning Protection

Despite careful considerations have been taken in lightning protection in the design of
the equipments and measures have been adopted, excessive-degree of lightning may
still damage the equipments. To achieve the best lightning protection effect, you are
recommended to:
Keep the grounding wire of the PGND of the chassis in good contact with the earth
ground.
Keep the grounding terminal of the AC power socket in good contact with the earth
ground.
Chapter 2 Installation Preparation
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