H3C Technologies H3C SecPath F100-C-EI - Manual (Page 23)

Installation Manual
H3C SecPath F100-C-EI Firewall
Chapter 2 Preparing for Installation
2-3
II. Harmful gas limits
There are rigorous limits on the content of salts, acids and
sulfides in the air. These harmful gases will speed up metal rusting
and the aging processes of certain parts. The specific limits of these
harmful gases are given in the following table.
Table 2-3
Harmful gas limits in the equipment room
Gas Maximum (mg/m
3
)
SO
2
0.2
H
2
S 0.006
NH
3
0.05
Cl
2
0.01
2.1.3 ESD-Preventive Requirements
I. Static electricity sources and harms
On the communication network connected to your device, the
static electricity mainly comes from:
z
The outside electrical fields, such as outdoor high-voltage
power cables and lightning.
z
The indoor environments, floor materials and the internal
systems such as the equipment frame.
Although many antistatic considerations have been given to your
device, damage to the device’s circuits or even the whole equipment
may still happen when the static electricity exceeds the tolerance
threshold.