QTech QSW-4600 Series Hardware Installation And Reference Manual page 33

QSW-4600 Series Switch Hardware Installation and Reference Guide
2.2.4 Grounding
A good grounding system is the basis for the stable and reliable operation of the QSW-4600 series switch. It is the chief
condition 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 operations properly as required.
Effective grounding of the switch is an important guarantee for lightning protection and interference resistance.
Therefore, connect the grounding line of the switch properly.
Safety Grounding
The equipment using AC power supply must be grounded by using the yellow/green safety grounding cable. Otherwise,
when the insulating resistance decreases the power supply and the enclosure in the equipment, electric shock may occur.
The building must provide protective grounding connection to ensure that the device is connected to the protection
location.
The installation and maintenance personnel must check whether the A.C. socket is well connected to the protection
location of the building, if not, they should use a protective grounding wire to connect the grounding end of the A.C.
socket to the building's protection location.
The power supply socket must be installed in a place that is near to the device and where users can operate the
device easily.
Before the installation of the device, make sure that ground connection is connected at first and disconnected finally.
The sectional area of the protective grounding wire should be at least 0.75 mm2 (18 AWG).
Use the 3-core power supply line. The sectional area of each pin should be at least 0.75 mm2 or 18 AWG.
Lightning Grounding
The lightning protection system of a facility is an independent system that consists of the lightning rod, download
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, irrelevant to the equipment.
EMC Grounding
The grounding required for EMC design includes shielding ground, filter ground, noise and interference suppression, and
level reference. All the above constitute the comprehensive grounding requirements. The resistance of earth wires should
be less than 1 ohm. The QSW-4600 series switch back plane is reserved with one grounding pole, as shown in Figure 2-1.
Figure 2-1Grounding of QSW-4600
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