Temperature/Humidity; Cleanness - NEC QX-S6648XP-6Q Installation Manual

Installation Guide
QX-S6600 Series Ethernet Switches
The rack is well earthed.

To ensure normal operation and long service life of your switch, install it in an environment
that meets the requirements described in the following subsections.

Temperature/humidity

Maintain appropriate temperature and humidity in the equipment room.
Lasting high relative humidity can cause poor insulation, electricity creepage,

mechanical property change of materials, and metal corrosion.
Lasting low relative humidity can cause washer contraction and ESD and bring

problems including loose captive screws and circuit failure.
High temperature can accelerate the aging of insulation materials and significantly

lower the reliability and lifespan of the switch.
For the temperature and humidity requirements of different switch models, see "Appendix A
Technical specifications".

Cleanness

Dust buildup on the chassis may result in electrostatic adsorption, which causes poor
contact of metal components and contact points, especially when indoor relative humidity is
low. In the worst case, electrostatic adsorption can cause communication failure.
Dust
Note:
Dust diameter ≥ 5 μm
The equipment room must also meet strict limits on salts, acids, and sulfides to eliminate
corrosion and premature aging of components, as shown in Table 2-2
Table 2-1 Dust concentration limit in the equipment room
Substance
≤ 3 x 10
Concentration limit (particles/m³)
(no visible dust on the tabletop over three days)
4
2-3
2 Preparing for installation