The most common Canadian Distribution voltages are 120/ 208 3 phase, 347/600 three phase. 120/240 single phase.
Some residential areas with high demand are being fed 120/208 single phase from a 3 phase utility distribution (not common)
277/480 does exist but it is not stock voltage except in some industrial areas where a lot of US manufactured equipment exists. If the nominal voltage is 575 then don't give them 480 volt equipment or someone is going to have to change the fan motor or add a transformer.
