Is it safe to unplug pc power cable from ups?

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natostanco

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Jan 20, 2014
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Is it safe to unplug pc power cable (after switching to 0 the psu) while the ups is connected to power and turned on? Or should I shut off the ups before detaching the pc power cable?
 
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bigpinkdragon286

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Oct 3, 2012
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If a UPS is providing the equivalent of a battery backed, household outlet, why would you treat it any differently? While it certainly shouldn't hurt to turn the UPS off before disconnecting electrical appliances from it, do you turn the household circuit breaker off to your wall outlets before unplugging other household appliances?
 
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Godto

Godto

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Jul 17, 2014
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PC is a sensitive equipment ... and this is from PC to power ... have you ever plug or pull a plug and if you don't do fast then there a little spark.

think about it .. why do you need to touch the case before handle ram, cpu ??

i rather be safe than sorry.
 
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hunter315

hunter315

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May 12, 2009
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The PSU serves the shield everything from the outside world, the vast majority of them are plugged straight into a wall outlet not a UPS so there is zero expectation that power will be shut off before they are plugged in or removed.

Godto, that is a dumb example, it is the equivalent of saying you always make sure you take the oil out of your car when performing deep engine work, wouldn't you do the same to change the headlight? No, i wouldn't because i understand what is going on and that fully assembled systems are much more protected and stable than their individual components are. Once you have everything in the case with the PSU in it you will actually have a very difficult time damaging the internals with any external source, PSUs can only hurt the internals when their secondary side blows out, any damage from the line would only hurt the primary side which is isolated.


You will do zero harm to the components of the system by plugging and unplugging the PSU while the UPS is on.
 
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Godto

Godto

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Jul 17, 2014
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yes it shield from out side world ... but this is with in .. not out side ... i alway turn my PSU off before i unplug or plug from any where either UPS or the wall ( the switch on the back of PSU) ...

yes some deep engine work created metal shaving .. and like a scratch .. metal shaving from it fall to oil ... but what save you here is oild Filter that do the job ...

and about the head light .. because power switch is already off .. so then change head ligh is ok .... just like changing a light bulb in your house .. turn the switch off .... guess what .. do google search to see how many peoples get the light bulb blow becasue they was too lazy or didn't know the light switch is till on
 
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bigpinkdragon286

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Oct 3, 2012
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Unless I'm mistaken, the question was, should the OP turn off the UPS before unplugging the computer? The OP's computer's power supply was said to be in an off state to begin with. The answer to the question is then, it doesn't matter either way, whether the UPS is on and plugged in or off and unplugged, as unplugging any device from a UPS is no different than unplugging that same device from a standard household outlet.
 
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