QTech QSW-6900-56LF Series Hardware Installation And Reference Manual page 14

Installation Manual
2. Preparation before Installation
Substance
Dust particles (diameter ≥0.5μm)
Dust particles (diameter ≥5μm)
Apart from dust, the salt, acid and sulfide in the air in the equipment room must also meet strict
requirements; as such poisonous substances may accelerate the corrosion of the metal and the
aging of some parts. The equipment room should be protected from the intrusion of harmful
gases (for example, SO
2
Gas
SO
2
H S
2
NO
2
Cl
2
The Average refers to the average limit of harmful gas in one week. The Maximum value is
the upper limit of the harmful gas in one week, and maximum value can last for up to 30
minutes every day.
2.2.5 System Grounding Requirements
A good grounding system is the basis for the stable and reliable operation of the QSW-6900-
56LF. It is the key to prevent lightning stroke and resist interference. Please carefully check the
grounding conditions on the installation site according to the grounding requirements, and
perform grounding properly as needed.
Safety Grounding
The device using AC or HVDC power supply must be grounded by using the yellow/green safety
grounding cable. Otherwise, when grounding fault happens in the high voltage circuit inside the
device, electric shock may occur.
The building installation shall provide a means for connection to protective earth, and the
device is to be connected to that means.
Lightning Grounding
The lightning protection system of the facility is an independent system that consists of the
lightning rod, down lead conductor and the connector to the grounding system, which usually
shares the power reference ground and yellow/green safety cable ground. The lightning
discharge ground is for the facility only, not for the device.
, H S, NO and Cl ), whose requirements are listed in the following table.
2 2 2
Average (mg/m
0.3
0.1
0.5
0.1
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Concentration
(particles/m
3.5
≤ ×
3 10
≤ ×
3
) Maximum (mg/m
1.0
0.5
1.0
0.3
14
Limit
3
)
6
10
4
3
)