Hardware Installation and Reference Guide
Preparation before Installation
leakage current of the system totals 30mA. A leakage protector with 30mA rated action current supports less than 10
power supplies (that is, Action current of the leakage protector/2/Maximum leakage current of each power supply
=30/2/1.5=10). In other words, the leakage protector with 30mA rated action current supports no more than 10 power
supplies. In this case, the 20 power supplies in the system require at least 2 leakage protectors with 30mA rated
action current and each leakage protector supports 10 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 shall be 50%
of the leakage action current. Take a leakage protector with 30mA rated leakage action current as an example. The
rated leakage non-action current shall be 15mA. When the leakage current is below 15mA, 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 30mA (human body safety current is 30mA). When twice of the total leakage current of the
system is greater than 30mA, 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
Static Discharge Damage Prevention
To prevent damage from static electricity, pay attention to the following:
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.
Indoor dust prevention
Proper humidity conditions
2.1.5
Laser
The RG-S1920 series switch supports 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:
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.
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.
Do not stare into any optical port under any circumstances, as this may cause permanent damage to your eyes.
2.2
Installation Site Requirements
To ensure the normal working and a prolonged durable life of the equipment, the installation site must meet the following
requirements.
