Perhaps indeed a transformer that separates the power from the power supply is the best solution if you have unbalanced power, isn't it?
Yep...that's the only way TO obtain balanced power from unbalanced mains, in fact. As opposed to power supplies, there's no balanced power solution that doesn't involve a huge transformer of some sort.
Do you know by any chance if the power is unbalanced in Canada too?
-- GarfieldModular
It is...it's worth noting, in fact, that part of Canada's grid interconnects with the NE USA's in the east, and there's other interconnections further west along the border. When we had a severe geomagnetic event about 20-ish years back, the multistate power failure that resulted started in Quebec from the storm overloading their transmission lines with inductive currents.