Ruijie Reyee RG-NIS3100 Series Hardware Installation And Reference Manual page 29

RG-NIS3100 Series Switches Hardware Installation and Reference Guide
If a power supply system is equipped with a leakage protector (leakage current switch or breaker), the rated
leakage action current of each leakage protector is twice greater than the maximum leakage current of all the
power supplies in the system. For example, if a system is equipped with 16 identical power supplies, the leakage
current of each power supply is equal to or less than 3.5 mA, and the total leakage current of the system is 56
mA. A leakage protector with 30 mA rated action current supports less than ten 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 4 power supplies. In this
case, the 16 power supplies in the system require at least 4 leakage protectors with 30 mA rated action current
and each leakage protector supports 4 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
current of all the power supplies. The rated leakage non-action current of a leakage protector must be 50% of the
leakage action current. The leakage protector with 30 mA rated leakage action current is used as an example.
The rated leakage non-action current must be 15 mA. When the leakage current falls below 15 mA, the protector
should 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 details of the leakage current value of each power supply model, see Chapter 0.
2.1.4 ESD
To prevent Electronic Static Discharge (ESD), pay attention to the following points:

Proper grounding of grounding screws on the back panel of the device, and three-wire single-phase socket
with protective earth wire (PE) used as the AC power socket.

Indoor dust prevention

Proper humidity conditions
2.1.5 Laser
The RG-NIS3100 series switches support varying models of optical modules (Class I laser products) sold on
the market. Improper use of optical modules may cause damage. Therefore, pay attention to the following
points:

When a fiber transceiver works, ensure that the port has been connected to an optical fiber or is covered
with a dust cap, to keep out dust and avoid burning your eyes.

When the optical module is working, do not pull out the fiber cable or look directly into the transceiver. The
transceiver emits laser light that may hurt your eyes.
Figure 2-1 Laser product marking
Do not stare into any optical port under any circumstances because this may cause permanent damage to
your eyes.
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Preparation before Installation