Hardware Installation and Reference Guide Preparation before Installation
Gas
Average (mg/m
3
)
Maximum (mg/m
3
)
NO
2
0.5
1.
0
Cl
2
0.1
0.3
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 RG-S6220-H. 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.
For lightning protection, refer to Appendix C.
EMC Grounding
The ground 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 grounding resistance should
be less than 1Ω. There is one grounding connector at the right bottom of the chassis of RG-S6220-H series switches.
The grounding connector is pasted with conspicuous warning labels.
Figure 2-1 EMC grounding
2.2.6 EMI Consideration
Various interference sources, from either outside or inside the device or application system, affect the system in the
conductive ways such as capacitive coupling, inductive coupling, and electromagnetic radiation. There are two types of
