CS500EI What happens when plugged in with polarity reversed.

[Anonymous user]

I work in Chile. The voltage here is 220 and the outlets are not keyed for polarity. The CS500EI workstation UPSs that I have do not have the wiring fault light that is apparently included on US models. My problem is that in my building the GFCI breakers are tripping several times per week. Usually at night when no one is there. Sometimes during the day. I have notice that sometimes plugging in a UPS (with no load) will cause the failure. Other times unplugging one will resolve it. I have just begun to consider the polarity problem. What happens if the polarity is reversed on the input and therefore on the output. And then what if a momentary outage occurs. Wouldn't the DC to AC circuitry change the polarity as long as the outage persisted. And then would it not change back when the outage was over? I am wandering if this behavior may be tripping those GFCI breakers.

[Anonymous user · Accepted solution]

I work in Chile. The voltage here is 220 and the outlets are not keyed for polarity. The CS500EI workstation UPSs that I have do not have the wiring fault light that is apparently included on US models. My problem is that in my building the GFCI breakers are tripping several times per week. Usually at night when no one is there. Sometimes during the day. I have notice that sometimes plugging in a UPS (with no load) will cause the failure. Other times unplugging one will resolve it. I have just begun to consider the polarity problem. What happens if the polarity is reversed on the input and therefore on the output. And then what if a momentary outage occurs. Wouldn't the DC to AC circuitry change the polarity as long as the outage persisted. And then would it not change back when the outage was over? I am wandering if this behavior may be tripping those GFCI breakers.