The equipment room must be free from explosive, conductive, magnetically-permeable, and
corrosive dust.
lists the requirement for dust concentration in the equipment room.
Table 5-11
Requirements for dust particles in the equipment room
Mechanical active
material
Unit
Concentration
Dust particle
Particle /m
3
≤ 3x 10
4
(no visible dust accumulated
on a workbench in three
days)
Suspending dust
mg/m
3
≤0.2
Precipitable dust
mg/m
2
·h
≤1.5
Description
l
Dust particle diameter ≥ 5 µm
l
Suspending dust diameter ≤ 75 µm
l
75 µm ≤ precipitable dust diameter ≤ 150 µm
Take the following measures to meet the requirements:
l
Use dustproof materials for ground, wall, and ceiling construction.
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 clothing 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
lists 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:
R250D
Hardware Installation and Maintenance Guide
5 Appendix
Issue 01 (2016-09-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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