Esd Prevention - H3C WX3000 Installation Manual

Table 2-3 Limit on harmful gases in the equipment room
SO
2
H S
2
NH
3
Cl
2

ESD Prevention

Static electricity generation and harms
The electrostatic induction that adversely affects the operation of the device mainly comes from:
Outdoor electric fields caused by high-voltage power lines or lightning strikes.
Internal systems, such as the indoor environment, floor materials, and the structure of the
integrated equipment.
Although a great deal of electrostatic discharge (ESD) prevention considerations have been taken in
the design of the WX3000 series, excessive static electricity is still remarkably harmful to the whole
device.
ESD prevention methods
To prevent ESD damage, do the following:
Make sure that the device and the floor are well grounded.
Keep the equipment room clean.
Keep proper temperature and humidity conditions.
When touching a circuit board, always wear ESD-preventive gloves or an ESD-preventive wrist
strap, and wear antistatic work clothes.
When mounting, removing, observing, or moving an interface module, always take the printed
circuit board (PCB) by the edges without touching the components on the PCB.
After removing an interface module, place the PCB on an antistatic workbench with the
component-side facing upward or place it in an antistatic bag.
ESD-preventive wrist strap
The ESD-preventive wrist strap is not provided with the device.
Follow these steps to use an ESD-preventive wrist strap:
Step1 Put on and fasten the wrist strap and make sure the wrist strap has good skin contact.
Step2 Attach grounding wire to the wrist strap and the alligator clip to the rack.
Step3 Verify that the rack is well grounded.
Gas
2-3
Limit (mg/m
0.2
0.006
0.05
0.01
3
)