H3C Technologies H3C SecPath F1000-E - Manual (Page 18)

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Figure 12 Attaching an ESD-preventive wrist strap
(1) Alligator clip (2) Lock (3) ESD-preventive wrist strap
EMI
All electromagnetic interference (EMI) sources, from outside or inside of the firewall and application
system, adversely affect the firewall in a conduction pattern of capacitance coupling, inductance
coupling, electromagnetic wave radiation, or common impedance (including grounding system)
coupling. To prevent EMI, perform the following steps:
• Take measures against interference from the power grid.
• Do not use the firewall together with the grounding equipment or lightning-prevention equipment
of power equipment, and keep the firewall far away from them.
• Keep the firewall far away from high-power radio launchers, radars, and equipment with high
frequency or high current.
• Use electromagnetic shielding when necessary.
Lightning protection
To protect the firewall from lightning better, do as follows:
• Make sure the chassis is properly grounded. For how to ground the firewall, see " Grounding the
firewall ."
• Make sure the grounding terminal of the AC power receptacle is properly grounded.
• Install a lightning protector at the input end of the power supply to enhance lightning protection
capability. For more information, see "
Connecting the AC power supply to a power strip with
lightning protection ."