Surge Protection - Ruijie RG-PF2920 Series Hardware Installation And Reference Manual

Hardware Installation and Reference Guide

EMC Grounding
Grounding required for electromagnetic compatibility includes shielded grounding, filter grounding, noise
and interference suppression, and level reference, which contribute to the overall grounding requirements.
The resistance of the grounding cable should be smaller than 1 ohm. Each of the RG-SF2920 series
switches provides one grounding stud on the side panel, as shown in
Figure 2-1 Grounding of RG-PF2920 Series Switches
2.2.6 EMI
Both external and internal EMI sources have an impact on the device or application system through mechanisms
such as capacitive coupling, inductive coupling, or electromagnetic waves.
EMI can arise through radiation or conduction, depending on the transmission path.
When energy, typically in the form of radio waves, emitted by one component reaches a sensitive component
through space, it is referred to as radiated interference. The source of interference can be a part of the affected
system or a completely electrically isolated unit. Conducted interference occurs when interference is transferred
from one unit to another through cables, which are typically electromagnetic wires or signal cables connecting
the source and the sensor. Conducted interference often disrupts the power supply of the device, but this can
be mitigated by a filter. Radiated interference may affect any signal path in the device, and is difficult to shield
against. EMI requirements are as follows:

Take interference prevention measures for the power supply system.

Ensure that the grounding device of the switch is located at a considerable distance from grounding and
lightning grounding devices of the power device.

Keep the switch far away from high-power radio transmitters, radar launch pads, and high-frequency large-
current devices.

Employ electromagnetic shielding measures when necessary.
2.2.7

Surge Protection

The device protects against lightning strikes. However, it is important to note that excessively strong lightning
strikes can still cause damage to the device. To enhance surge protection, follow these measures:
Figure
17
Preparing for Installation
2-1.