The grounding must be fine.
1.2 Characteristic Parameters of 8/24 switch
IEEE 802.1d Spanning Tree Protocol
IEEE 802.1p Class of Service
IEEE 802.1q tagged VLAN
IEEE 802.3x Flow control
IEEE 802.3ad Link aggregation
IEEE 802.3af Power via Media Dependent Interface
IEEE 802.3at DTE Power Enhancements
IP routing protocol
standard
RFC 1058 RIP
RFC 1723 RIP v2
Network management
standard
RFC 1157 SNMP v1/v2
RFC 1213 MIB II
RFC 1757 RMON 1,2,3,9
2/4 Gigabit Ethernet SFP ports
1 Console port
8/24 Gigabit Ethernet TX ports
Operating
temperature/humidity
0℃ to 45℃; 5%-95% non-condensing
Storage temperature/
humidity
-20℃ to 70℃; 5%-95% non-condensing
Input voltage: AC100-240V;
Input frequency: 50Hz±10%