Ruijie RG-NBS3100 Series Switches Hardware Installation and Reference Guide Preparation before Installation
18
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
should be less than 1 Ω. The RG-NBS3100 series switch back plane is reserved with one grounding pole, as shown in
Figure 2-1.
Figure 2-1 Grounding of the RG-NBS3100
2.2.6 Lightning Resistance
When the AC power cable is imported outdoors and directly connected to the power port of the RG-NBS3100 series
switch, use the lightning line bank to prevent the switch from being hit by lightning shocks. In this case, connect the
mains supply AC cable to the lightning line bank, and connect the switch to the lightning line bank. This helps prevent
the current of high-voltage lightning from passing the switch directly through the mains supply cable to a certain extent.
The lightning line banks are not provided and should be purchased by customers as required.
2.2.7 EMI
Electro-Magnetic Interference (EMI), from either outside or inside the device or application system, affects the system in
the conductive ways such as capacitive coupling, inductive coupling, and electromagnetic radiation.
There are two types of electromagnetic interference: radiated interference and conducted interference, depending on
the type of the transmission path.
When the energy, often RF energy, from a component arrives at a sensitive component through the space, the energy
is known as radiated interference. The interference source can be either a part of the interfered system or a completely
electrically isolated unit. Conducted interference results from an electromagnetic wire or signal cable connection
between the source and the sensitive component, along which cable the interference conducts from one unit to another.
Conducted interference often affects the power supply of the device, but can be controlled by a filter. Radiated
interference may affect any signal path in the device and is difficult to shield.
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