Hardware Installation and Reference Guide Preparation before Installation
40
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 mA, and the leakage current of the system totals 24 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). In other words, the leakage protector with 30 mA rated action current supports no more than four
power supplies. In this case, the eight power supplies in the system require at least two 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:
Connect the device's circuit to the ground.
Clear up the dust.
Maintain the proper humidity.
2.1.5 Laser
Among the modules supported by the RG-S5750H series, many are Class I laser products. Therefore,
pay attention to the following when using 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.
Do not stare into the optical ports.
Do not approach or stare into any optical port, as this may cause permanent damage to your eyes.
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