Electromagnetism Requirements for the Equipment Room
All interference sources, inside or outside the equipment room, can cause equipment problems
with capacitive coupling, inductive coupling, electromagnetic wave radiation, and common
impedance (including grounding system) coupling. Prevent the interference using these
approaches:
l Take effective measures against electrical interference from the power supply system.
l Do not use the working ground of the equipment as the same ground for surge protection.
Separate them as far as possible.
l Keep the equipment far away from strong power radio transmitters, radar units, and high-
frequency and high-current equipment.
l Use electromagnetic shielding if necessary.
Requirements for Lightning Proof Grounding
Table 5-13 shows the requirements for lightning proof grounding.
Table 5-13 Requirements for lightning proof grounding
Item Requirements
Capital
construction
l Use the reinforced concrete structure for the construction of the
equipment room.
l Install the lightning proof device like a lighting rod in the room.
l The lightning proof ground shares the same grounding body with the
protection ground of the room.
Power cables
leading in the
equipment room
need to be
equipped with a
surge arrester
l After the low-voltage power cables are led into the room, install the
surge arrester for the power cables in the AC voltage stabilizer and the
AC power distribution panel (box). Ground the arrester nearby and
correctly.
l For the equipment room in the city, install the power supply arrester
with the nominal discharging current no less than 20 kA. For the
equipment room built in the suburbs subject to lightning strike, install
the power supply arrester with the nominal discharging current larger
than 60 kA. For the equipment room in the mountain areas easily
subject to lightning strike, or in the separate high-rise buildings in the
city, install the power supply arrester with the nominal discharging
current larger than 100 kA.
l The ground cable of the surge arrester should be a maximum of 1 m
(3.28 ft) long.
Huawei AP3x10xN&5x10xN&5x30xN&6x10xN&7x10xN
Hardware Installation and Maintenance Guide 5 Appendix
Issue 11 (2015-05-18) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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