Hardware Installation and Reference Guide Appendix
84
7.4 Lightening Protection
Installing AC Power Arrester (Lightning Protection Power Strip)
The AC power port must be connected to an external lightning protection power strip to prevent the switch from being struck by
lightning when the AC power cord is introduced from the outdoor and directly connected to the power port of the switch. The lightning
protection power strip can be fixed on the rack, workbench, or wall in the equipment room by using cable ties and screws. AC power
enters the lightening protection power strip and then gets to the switch.
Figure 7-4 Power Arrester
Grounding and polarity detection indicator: If the
indicator is red, cable connection is incorrect (the
ground cable is not connected, or the N and L lines are
reversely connected). Check your power supply line.
Normally running indicator: When the
indicator is green, the circuit is working
properly. Otherwise, the protective circuit is
damaged.
Installed electronic circuit board
Multi-purpose sockets (connected to the power
supply of the switch)
Overload auto-protector, which
can be reset manually
IEC standard socket, which is
connected to the power supply
in the equipment room through
the power cable
Power switch
The power arrester is not delivered with the switch. Please purchase it based on actual requirements.
Make sure that the PE terminal of the power arrester is well grounded.
After the AC power plug of the switch is connected to the socket of the power arrester (lightning protection power strip), the
lightning protection function is implemented only if the RUN indicator is green and the ALARM indicator is OFF.
If the ALARM indicator on the power arrester is red, check whether it is caused by poor grounding connection or by the reversed
connection of the Null and Live lines. The detection method is as follows: Use a multimeter to measure the polarity of the power
socket for the arrester when the indicator is red. If the N line is on the left and the L line is on the right (facing the socket), the
arrester’s PE terminal is not grounded. If not, the polarity of the arrester power cord should be reversed. In this case, you should
open the power arrester and rectify the polarity of the connection. If the indicator is still red, the arrester’s PE terminal has not
been grounded.
Installing the Ethernet Port Arrester
Please connect an Ethernet port arrester to the switch to prevent the damage by lightning before connecting an outdoor Ethernet
cable to the switch.
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