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l Use screens on the door and windows facing outside. The outer windows should be dust-
proof.
l Clean the equipment room regularly and clean the air filter monthly.
l Wear shoe covers and ESD clothes before entering the equipment room.
Requirements for Corrosive Gases
The room should be free from dusts and corrosive gases, such as SO
2
, H
2
S, and NH
3
. Table
5-12 shows the requirements for the corrosive gas concentration.
Table 5-12 Requirements for corrosive gas concentration
Chemical active
material
Unit Concentration
SO
2
mg/m
3
≤ 0.20
H
2
S
mg/m
3 ≤ 0.006
NH
3
mg/m
3 ≤ 0.05
Cl
2
mg/m
3
≤
0.01
Take the following measures to meet the requirements:
l Avoid constructing the room near a place where the corrosive gas concentration is high,
such as a chemical plant.
l Ensure the air intake vent of the room is in the prevailing upwind direction from the
pollution source.
l Place batteries in different rooms.
l A professional service should monitor the corrosive gas conditions regularly.
Requirements for ESD Prevention
The absolute value of electrostatic voltage is less than 1000 V.
Take the following measures to meet the requirements:
l Train operators about ESD prevention.
l Keep the correct humidity level in the equipment room to reduce the impact of static
electricity.
l Lay out an ESD floor in equipment rooms.
l Wear ESD shoes and clothing before entering equipment room.
l Use ESD tools, such as wrist straps, tweezers, and pullers.
l Ground all conductive materials in the room, including computer terminals. Use ESD
worktables.
l Keep non-ESD materials (such as common bags, foams, and rubbers) at least 30 cm (11.81
in.) away from boards and ESD-sensitive components.
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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