Hardware Installation and Reference Guide Preparingfor Installation
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hookedby the chassis.
Keep tools andcomponents awayfrom walking areas.
2.1.2 Handling Safety
Prevent the switchfrom being frequently handled.
Cut off all powersuppliesand unplug all powercords before movingor handlingthedevice.
Keep balanceand prevent personal injurieswhenhandling the switch.
2.1.3 Electric Safety
Warning
●Any nonstandard andinaccurateoperation can causean accident suchas fire orelectrical attack, thus
causing severedamages tohumanbodiesandtheswitch.
●Direct or indirecttouch through a wet objecton high-voltage and mains supplycan bring a fatal danger.
Observe local regulations and specifications during electricoperations. Onlypersonnel withqualifications
can perform such operations.
Check whether there are potential risks in the workarea. For example, check whether the power supplyis
grounded,whetherthe grounding is reliable,andwhethertheground is wet.
Find out the position of the indoor emergencypower switch before installation. Cut offthe power switchin
the case of accidents.
Make sure that the switchis powered offwhenyou cut off the powersupply.
Equip the power supplysystem with a leakage protector (also referred to as “leakage current switch” or
“leakage current breaker”) to automate the power cut-off in the case of power leakage or shock. When
selecting the leakage protector, observe the following rule:
○The rated leakage action current of each leakage protector is greater than twice of the theoretical
maximum leakagecurrentofallthe powersupplies inthesystem.
Forexample,ifasystem is equippedwith16 identicalpowersupplies,theleakagecurrentofeachpower
supplyis at most 3.5 mA, and the leakage current of the system totals 56 mA(maximum theoretical
value).Aleakage protectorwith 30mAratedaction currentsupports less than ninepowersupplies (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 a rated action current of 30 mA supports up to four
powersupplies.Inthis case,the16powersupplies inthesystem requireatleastfourleakage protectors
with a ratedaction currentof 30 mAand each leakageprotectorsupports fourpowersupplies.
Ifpowersupplies in a system differinmodels,theratedleakageactioncurrentofeach leakage protector
dividedby two is greater thanthe sum ofmaximum leakagecurrents ofall the powersupplies.
○The ratedleakage non-action currentof aleakageprotector shallbe 50% ofthe leakageaction current.
If the non-action current value is too small, the high sensitivity level may cause the circuit to break,
causing powercut-offand service interruption even if the leakagecurrentvalue is normal.
Take a leakage protector with a rated action current of 30 mAas an example. The rated leakage non-
action current shallbe15 mA. When the leakagecurrentis less than15mA,the protector shallnotact.
