Ruijie RG-NBS3100 Series Hardware Installation And Reference Manual page 40

Ruijie RG-NBS3100 Series Switches Hardware Installation and Reference Guide
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Reversed direction of the arrester installation. You shall connect the external network cable to the "IN" end and
connect the switch Ethernet port to the "OUT" end.
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Poor arrester grounding. The length of the grounding line should be as short as possible to ensure that it is in good
contact with the switch grounding terminal. Use the multimeter to confirm the contact condition after the grounding.

Incomplete arrester installation. If there is more than one port connected to the peer device on the switch, it needs to
install the arresters on all connection ports for the purpose of the lightning protection.
Appendix C Lightning Protection
40