APC's high voltage products come in 2 types. The first is the 208volt standard. The other is the international 230volt standard. Most 208v units are designated with a "T" in the part #... SURTD5000XLT. Most 230v units are designated with a "I" such as SURT5000XLI.
The problem is that high voltage in the US is not always 208v. Homeowners wanting highvoltage UPSes need 240volt. Some businesses also only have 240volt.
The good news is that in most cases, these units can be set to accept any voltage from 190 to 260. Further, most high voltage equipment can take 200-250v without a problem.
So while most people in the states should take the "T" version, its not a problem choosing the "I" version.
CAUTION: The only problem is if you need a stepdown transformer. 208volts units step down to 120. 230volt units step down to 126volt.
