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ESD prevention
Cleanliness
Corrosive gas prevention
EMI
Cleanliness
Dust buildup on the chassis might cause electrostatic adsorption and dust corrosion, resulting in
poor contact of metal connectors and contact points. This might shorten the device's lifetime and
even cause device failure in the worst case.
cleanliness.
Table1-3 Switch requirement for cleanliness
Substance
Dust particles
To maintain cleanliness in the equipment room, follow these guidelines:
•
Keep the equipment room away from pollution sources. Do not smoke, eat, or drink in the
equipment room.
•
Use double-layer glass in windows and seal doors and windows with dust-proof rubber strips.
Use screen doors and window screens for doors and windows open to the outside and make
sure the external windows are air tight.
•
Use dustproof materials for floors, walls, and ceilings and use wallpaper or matt paint that does
not produce powders.
•
Clean the equipment room regularly and clean the air filters of the rack each month.
•
Wear ESD clothing and shoe covers before entering the equipment room, keep the ESD
clothing and shoe covers clean, and change them frequently.
Corrosive gas limit
Corrosive gases can accelerate corrosion and aging of metal components. Make sure the corrosive
gases do not exceed the concentration limits as shown in Table1-4.
Requirements
•
Route different types of cables separately.
•
Keep power cords a minimum of 5 cm (1.97 in) away from other
cables.
•
Ground the switch correctly.
•
To avoid ESD damage to the device or components, always wear an
ESD wrist strap when you install or remove the device or
components.
•
Make sure the wrist strap has good skin contact and is reliably
grounded.
•
For more information, see "Cleanliness."
The installation site must be free from corrosive gases such as acid
gases and alkaline gases. For more information, see
limit."
•
If AC power is used, use a single-phase three-wire power receptacle
with protection earth (PE) to filter interference from the power grid.
•
Keep the device far away from radio transmitting stations, radar
stations, and high-frequency devices.
•
Use electromagnetic shielding, for example, shielded interface
cables, when necessary.
Table1-3
Particle diameter
≥ 0.5 µm
1-3
"Corrosive gas
describes the switch requirement for
Concentration limit
≤ 1.8 × 10
7
particles/m
3
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