10-24-2007, 05:27 PM
Inrush current is probably the cause of tripping the GFCI. Even though the steady state maximum output listed for the UPS is 1600 W, the input side will be higher due to less than 100% conversion. It probably can briefly draw as much as 3000 W or more when it first starts after you turn it on or plug it in. Even at steady state you do not want this on a 15 A plug or circuit, I have seen this model trip 25 A breakers. It really is happier on a 220 V circuit with a 15 A breaker. APC did make a 2200 VA model designed to go on a 15 A 110 V circuit, but discontinued it the last time the codes were updated.
As for wiring, the code used to allow a 20 A breaker and plug on a short run of 14 gauge wire if that was the only thing on the circuit. That was removed when they found too many circuits got extended later and the initial 14 gauge run was then insufficient, now it must be 12 gauge all the way. Measuring based on the marking on a wire cutter is not enough to be certain, you would nee to pull enough of the cable to read the casing description for the wire inside.
As for wiring, the code used to allow a 20 A breaker and plug on a short run of 14 gauge wire if that was the only thing on the circuit. That was removed when they found too many circuits got extended later and the initial 14 gauge run was then insufficient, now it must be 12 gauge all the way. Measuring based on the marking on a wire cutter is not enough to be certain, you would nee to pull enough of the cable to read the casing description for the wire inside.