H3C WX3000 Installation Manual page 97

Appendix C Installation of Lightning Arrester for AC
Power
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, please serially connect the lightning
arrester for AC power (lightning protection grounding strip) before you plug AC power cable into the
switch, thus to prevent possible damages to the switch due to 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 C-1 Diagram of lightning arrester
Normal operation indicator (green):
On means that the arrester works normally .
Otherwise, the protection circuit has
.
been damaged
Mainboard Mainboard
Note the following points:
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:
Grounding and polarity indicator (red)
On means that the lines are improperly connected
(either the grounding cable is not well connected , or the live and zero lines are improperly connected )
Please check the power supply circuit .
Multipurpose power socket, connected
to the device protected by the arrester.
Power switch
Power socket (complied with IEC standard),
connected to the power supply of
the equipment room through power cable
Overload auto protector,
which can be manually reset.
C-1