Item Requirements
Grounding
resistance
l The grounding resistance must be lower than 1 ohm.
l The upper end of the grounding body should be at least 0.7 m (2.30
ft) over the ground. In cold areas, bury the grounding body below the
frozen ground.
l Measure the grounding resistance periodically to ensure effective
grounding.
Routing of signal
cable
l Do not arrange the signal cables overhead in the equipment room. All
signal cables must be led into the site underground.
l Use the cables with metal jacket or place them into the metal pipe if
they come out/in the equipment room.
l Ground the idle lines inside the cable in the equipment room.
l Signal cables should be deployed on internal walls. Do not deploy
outdoor aerial cables.
l Keep signal cables away from power cables and surge protection
devices.
Collective
ground cable
l Use the grounding ring or ground bar for the collective ground cable.
l Do not use aluminum cables as ground cables. Adopt measures to
prevent electrification corrosion when connecting different metal
parts together.
l Use the copper busbar as the collective ground cable with the cross-
sectional area not less than 120 mm
2
(0.19 in.
2
), or use the galvanized
flat steel of the same resistance. Insulate the collective ground cable
from the reinforcing steel bars of the building.
Grounding lead-
in
The grounding lead-in should be a maximum of 30 m (98.42 ft) long. Use
the galvanized flat steel with cross-sectional area of 40 mm x 4 mm (1.58
in. x 0.158 in.) or 50 mm x 5 mm (1.97 in. x 0.197 in.).
Huawei AP8030DN & AP8130DN
Hardware Installation and Maintenance Guide 5 Appendix
Issue 02 (2014-12-05) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
93
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