Ruijie RG-NBS3100 Series Hardware Installation And Reference Manual page 18

Ruijie RG-NBS3100 Series Switches Hardware Installation and Reference Guide
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Be sure to make a careful check before you shut down the power supply.
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Do not place the equipment in a damp location. Do not let any liquid enter the chassis.
Any non-standard and impropriate electric operations may cause an accident such as a fire or electrical shock,
thus causing severe even fatal damage to human bodies and equipment.
Direct or indirect touch through a wet object on high-voltage and commercial electricity may bring a fatal danger.
If a power supply system is equipped with a leakage protector (also referred to as "leakage current switch" or
"leakage current breaker"), the rated leakage action current of each leakage protector is greater than twice of the
theoretical maximum leakage current of all the power supplies in the system. For example, if a system is equipped
with eight identical power supplies, the leakage current of each power supply is equal to or less than 3.5 mA, and
the leakage current of the system totals 56 mA. A leakage protector with 30 mA rated action current supports less
than five power supplies (that is, Action current of the leakage protector/2/Maximum leakage current of each
power supply = 30/2/3.5 = 4.28). In other words, the leakage protector with 30 mA rated action current supports no
more than four power supplies. In this case, the sixteen power supplies in the system require at least four leakage
protectors with 30 mA rated action current and each leakage protector supports four 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 parameter table in
Chapter 1.
2.1.4 ESD
To prevent Electronic Static Discharge (ESD), pay attention to the following:
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Proper grounding of grounding screws on the back panel of the device. Use of a three-wire single-phase socket
with protective earth wire (PE) as the AC power socket.
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Indoor dust prevention
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Proper humidity conditions
2.1.5 Laser
The RG-NBS3100 series switches support varying models of optical modules sold on the market which are Class I laser
products. Improper use of optical modules may cause damage. Therefore, pay attention to the following when you use
them:
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When a fiber transceiver works, ensure that the port has been connected with an optical fiber or is covered with a
dust cap, to keep out dust and avoid burning your eyes.
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When the optical module is working, do not pull out the fiber cable and stare into the transceiver interface or you
may hurt your eyes.
Preparation before Installation
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