Huawei AP4050DN, Hardware Installation And Maintenance Manual

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AP4050DN-HD
Hardware Installation and Maintenance Guide
5 Appendix
Issue 01 (2016-04-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
77

Place batteries in different rooms.

A professional service should monitor the corrosive gas conditions regularly.
Requirements for ESD Prevention
The absolute value of electrostatic voltage must be less than 1000 V.
Take the following measures to meet this requirement:

Train operators about ESD prevention.

Keep the correct humidity level in the equipment room to reduce the impact of static
electricity.

Lay out an ESD floor in equipment rooms.

Wear ESD shoes and clothing before entering equipment room.

Use ESD tools, such as wrist straps, tweezers, and pullers.

Ground all conductive materials in the room, including computer terminals. Use ESD
worktables.

Keep non-ESD materials (such as common bags, foam, and rubber) at least 30 cm (11.81
in.) away from boards and ESD-sensitive components.
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:

Take effective measures against electrical interference from the power supply system.

Do not use the working ground of the equipment as the same ground for surge protection.
Separate them as far as possible.

Keep the equipment far away from high-power radio transmitters, radar units, and
high-frequency and high-current equipment.

Use electromagnetic shielding if necessary.
Requirements for Lightning Proof Grounding
Table 5-13 lists the requirements for lightning proof grounding.
Table 5-13
Requirements for lightning proof grounding
Item Requirements
Capital
construction

Use reinforced concrete to construct the equipment room.

Install a lightning proof device like a lightning rod outside the room.

The lightning proof ground shares the same grounding body with
the protective ground of the room.
Power cables
leading in the
equipment room
need to be
equipped with a

After the 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.

For an equipment room in urban area, install a power supply surge