H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 46)

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Appendix D Installing a lightning arrester for
AC power
NOTE:
No lightning arrester (lightning protection grounding strip) is supplied with the switch.
If an outdoor AC power cable should be directly led to the switch, serially connect the lightning arrester
for AC power (lightning protection grounding strip) before you plug AC power cable into the switch to
prevent possible damages to the switch caused lightning strike. You can use cable clips and screws to
fasten the lightning arrester for AC power on the cabinet, workbench or the wall of the equipment room.
When you power on the switch, the AC power flows through the lightning arrester and then into the
switch.
Figure 38 Diagram of lightning arrester
Note the following guidelines:
1. Make sure that the PE terminal of the arrester is well grounded before using the lightning arrester
for power.
2. Upon plugging the AC power cable connector of the switch into the receptacle of the lightning
arrester, if the green LED is on while the red LED does not alarm, it means that the lightning arrester
of power is running and the function of lightning protection has taken effect.
3. Pay adequate attention if the red LED is on. You should correctly locate the problem, whether it is
caused because the ground cable of the arrester is not well grounded or because the live and zero
wires are connected in reverse direction.
4. You may use a multimeter to examine the polarity at the power receptacle of the arrester:
• If the multimeter displays that the left wire is the zero wire and the right is the live wire, it means that
the PE terminal of the arrester is not well grounded.