H3C S5500-EI Series Installation Manual page 68

CAUTION:
Make sure that the arrester is well grounded before using the lightning arrester for power.
•
After inserting AC power cord plug of switch into the socket of lightning arrester, if the green LED is on
•
and 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.
• Pay adequate attention if the red LED is on. You should correctly locate the problem, whether it is caused
because the ground wire of the arrester is not well grounded or because the live and zero wires are
connected in reverse direction. You may check that in the following way. When the red LED is on, use a
multimeter to examine polarity at the power socket of the arrester. If it is same to that of the power socket
in the equipment room, it means that arrester is not well grounded. If it is adverse to that of the power
socket in the equipment room, it means that the power socket of the arrester is set to the reverse polarity.
In this case, you should open the power socket of arrester to correct polarity. After that, if the red LED still
alarms, it means that the arrester is not well grounded yet.
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