Huawei NE05E Hardware Manual page 397

HUAWEI NE05E,NE08E
Hardware Guide
Item
Equip the incoming power cable with a
surge protector
DC power supply grounding
Issue 05 (2023-03-31) Copyright © Huawei Technologies Co., Ltd.
4 Hardware Installation and Parts Replacement
Description
After the AC low-voltage power cables
are led into the room, install the surge
protector for the power cables in the
AC voltage stabilizer and the AC power
distribution panel (box). Correctly
ground the surge protector nearby.
After the DC power cable is led into
the equipment room or outdoor
cabinet from outdoors or outside the
cabinet, install a power lightning
protection device for the DC power
cable. The lightning protection device
should be grounded in proximity. For
an equipment room in urban area,
install a power supply surge protector
with the nominal discharge current of
no less than 20 kA. For an equipment
room that is built in a suburb and
subject to lightning strikes, install a
power supply surge protector with the
nominal discharge current of more
than 60 kA. For an equipment room
that is built in a mountain area and
subject to frequent lightning strikes, or
in a separate high-rise building in a
city, install a power supply surge
protector with the nominal discharge
current of more than 100 kA. The
ground cable of the surge protector
should be no longer than 1 m (3.28
ft).
The working ground of the office, that
is, the anode of a -48 V DC power
supply or the cathode of a 24 V power
supply, should be led from the in-door
grounding bus line by proximate. The
ground cable should satisfy the
maximum load of the equipment. The
power supply facilities for the office
are to possess a DC working neutral
line, which is introduced from the
general grounding bus line or the
protection ground bar of the
equipment room.
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