Hardware Installation and Reference Guide
Preparing for Installation
49
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Check the switch carefully before shutting down the power supply.
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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 twenty identical power supplies, the leakage current of each power supply is equal
to or less than 1.5mA, and the leakage current of the system totals 30mA. A leakage protector with 30mA
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 =30/2/1.5=10). In other words, the leakage
protector with 30mA rated action current supports no more than ten power supplies. In this case, the twenty
power supplies in the system require at least two leakage protectors with 30mA rated action current and
each leakage protector supports ten 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.
Note
●
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
Electrostatic Discharge Safety
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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.
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When installing different types of transceiver modules, wear an antistatic wrist strap and ensure that it is
reliably grounded.
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Do not use bare hands to touch the components and the printed circuit boards (PCBs).
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Use an ESD shielding bag to properly store the boards.
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Do not let any clothes touch PCBs. An antistatic wrist strap can only prevent human static electricity from
damaging the PCBs but cannot prevent static electricity on clothes.
2.1.5
Laser Safety
The RG-ES126S-LP and RG-ES118S-LP 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.
Precautions:
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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.
