I have a pc that is connected to a UPS and connected to the outlet. When I turn on the UPS while holding the pc case I can feel a small electric shock, also when the UPS is on charging mode I can feel the electricity all over the case. I know it's not normal to feel the electricity on the case, do I have a faulty PSU, a faulty UPS or its normal?
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If your computer is not connected to a grounded walloutlet, it is very normal to feel the electricity, given that ground cannot be leaked into ground.
In many houses, the computer is not put into a grounded wall-outlet. It will not kill your pc, but if you put it in a grounded wall-outlet, a pc will usually run slightly more stable. It is recommended, but not a requirement.
If your UPS is connected to a grounded wall-outlet, and that outlet is also working properly (the ground pin is connected to the ground powerline that runs in the house), then the UPS or one of its cables is likely faulty, as that shouldn't happen.
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