QSW-4700 Series Switches Hardware Installation and Reference Guide
Preparing for Installation
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supply = 30/2/1.75 ≈ 8.57). In other words, the leakage protector with 30 mA rated action
current supports no more than eight power supplies. In this case, the 16 power supplies
in the system require at least two leakage protectors with 30 mA rated action current
and each leakage protector supports eight power supplies. If power supplies in a system
differ in models, the rated leakage action current of each leakage protector divided by
two is greater than the sum of maximum leakage currents of all the power supplies. The
rated leakage non-action current of a leakage protector shall be 50% of the leakage
action current. Take a leakage protector with 30 mA rated leakage action current as an
example. The rated leakage non-action current shall be 15 mA. When the leakage
current is below 15 mA, the protector shall not act. Otherwise, misoperation may easily
occur due to high sensitivity and thus the leakage protector trips, devices are powered
off, and services are interrupted.
•
To guarantee personal safety, the rated leakage action current of each leakage protector
in the system must be equal to or less than 30 mA (human body safety current is 30
mA). When twice of the total leakage current of the system is greater than 30 mA, the
system must be equipped with two or more leakage protectors.
•
For the leakage current value of each power supply model, see the power supply model
specifications in Chapter 1.
2.1.4. Electrostatic Discharge Safety
To prevent damage from static electricity, you must pay attention to the following:
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Properly ground the device and floor.
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Keep the indoor installation environment clean and free of dust.
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Maintain appropriate humidity conditions.
2.1.5. Laser Safety
Among the modules supported by the switch, there are many transceiver modules that are Class
I laser products.
•
When a fiber transceiver works, ensure that the port has been connected with a fiber or
covered by a dust cap to keep out dust and prevent it from burning your eyes.
•
Do not stare at any fiber port.
2.2. Installation Environment Requirements
Install the switch indoors to ensure its normal operation and prolonged service life. The
installation site must meet the following requirements.
2.2.1. Ventilation Requirements
Maintain a minimum clearance of 100 mm (3.94 in.) around the device for air circulation. After
various cables are connected, bundle the cables or place them in the cable management
bracket to avoid blocking air inlets.
2.2.2. Temperature/Humidity Requirements
To ensure the normal operation and prolonged service life of the switch, maintain an
appropriate temperature and humidity in the equipment room. The equipment room with too
high or too low temperature and humidity for a long period may damage the switch.
•
In an environment with high relative humidity, the insulating material may have poor
insulation or even leak electricity.
