Hardware Installation and Reference Guide Preparation Before Installation
ii
The AC power supplying system is the TN system. The single-phase three-wire socket with protecting grounding
must be used as the socket for the power supply to enable the device’s upper filter circuit to effective filter the power
interface.
The switch should be far from high-power radio transmitting stations, radar stations and high-frequency and large-
current devices.
Electromagnetic shielding methods should be applied when necessary, such as using the shielded cable as the
interface cable.
Cables must be connected to interfaces inside the room to prevent damage to the device’s signal ports caused by
over-voltage and over-current generated by thunder and lightning.
2.2.5 Grounding
A good grounding system is the basis for stable and reliable operation of the device, preventing lightning strokes and
resisting interference. Carefully check the grounding conditions at the installation site according to the grounding
requirements, and perform grounding operations properly as required.
Effective grounding of the switch guarantees surge protection and interference resistance. Therefore, connect the
grounding line of the switch properly.
The grounding cable is prepared by customers.
Safety Grounding
The device 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 the 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, 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 device installation, ensure that the ground is connected at first and disconnected finally.
The sectional area of the protective grounding wire should be at least 0.75 mm
2
(18 AWG).
Use the 3-core power supply line. The sectional area of each pin should be at least 0.75 mm
2
or 18 AWG.
Lightning Grounding
The surge protection system of a facility is an independent system that consists of the lightning rod, down conductor, and
connector to the grounding system, which usually shares the power reference ground and ground cable. The lightning
discharge ground is targeted for the facility.
EMC Grounding
The grounding required for EMC design includes the shielding ground, filter ground, noise and interference suppression,
and level reference. All the above constitute the comprehensive grounding requirements. The resistance of earth wires
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