Originally Posted by ferretttt
I have never seen a UPS with a GFCI device attached. I would say that it might be a good idea to have the UPS plug into one (I have it set up that way, so if it trips the circuit, the battery will work, until I reset it)
Yes... I agree that plugging the UPS into a GFCI outlet is a good idea. But I think you should also consider one on the outlet side of your UPS for the very reason you mentioned: "if it trips the circuit, the battery will work..."
Let's say that whatever you have plugged into your UPS has a short circuit to the tank. You touch the tank and get a little zap and then the main GFCI that your UPS is plugged into trips out. Great... no power... exactly what you want. But then your UPS says, "Hey... no power. I better kick in." So before you even realize what's happening and you still have your hand in the tank, the UPS kicks in and powers up that thing that has the short circuit. Which then zaps you again, and continues zapping because there's nothing now - except for a circuit breaker on the UPS if it has one - to shut off the power between the UPS and the faulty device.