What electrical supply rating does a 5000VA UPS require?

A 500VA 500W UPS is designed to connect to a single-phase electrical supply. It is sometimes called a single-phase UPS for a 1/1 (single phase in and single phase out) installation. The UK electrical supply voltage is 230Vac 50Hz and a 500VA UPS will be supplied with a power cord with a BS1363 3-square pin plug to plug into a wall socket. Power from the UPS is provided typically by IEC320 C13 outlet sockets on the rear of the UPS or on the top for a desktop unit.