H3C Technologies H3C WX5000 Series Access Controllers - Manual (Page 19)

2-4
3) Lock the terminal of the alligator clip to the ESD-preventive wrist strap.
4) Attach the alligator clip to the rack where the access controller is installed.
5) Make sure that the rack has been well-grounded.
Figure 2-1 Use ESD-preventive wrist strap
(1) ESD-preventive wrist strap (2) Locker (3) Alligator clip
Electromagnetic Environment Requirements
The operation of your access controller may be affected by external interferences, such as capacitance
coupling, inductance coupling, electromagnetic wave radiation, common impedance (including the
grounding system) coupling, and the conducted interference of leads (power cords, signaling cables
and output wires). To eliminate the interferences,
z
Use the TN power system as the AC power supply system. A TN power system is called zero
connection protection system. It is a power distribution system with one point connected directly to
earth (ground). The exposed conductive parts and the neutral metal parts of the installation are
connected to that point by protective earth conductors. Use a single-phase three-wire power socket
with a protection earth (PE) to effectively filter interference from the power grid.
z
Keep the access controller far from high-power radio transmitters, radars, and high-frequency
heavy-current devices.
z
Use electromagnetic shielding measures when necessary. For example, use shielded interface
cables.
z
Route interface cables only indoors to prevent signal ports from getting damaged by over-voltage
or over-current caused by lightning strikes.
Laser Safety
The WX5002V2 is a Class 1 laser device.
When the optional optical ports on the WX5002V2 are operating, avoid staring into the optical interfaces
because the high-energy laser beam emitted from the optical fiber may hurt your retina.