I stopped using Powerware a few years ago and have since settled on the GE LP series. Double conversion on line UPS up to 10KVA. We're using a FERRUPS 3.1 in a TOC. The 3.1's do require 220, 30A circuit, but will output 120. You can set-up a bypass arrangement if necessary, but it's a PIA and there are a number of arcane code issues to deal with. MM