CSA is used on products in the US and has been for a while now. It is used in lieu of other safety standards like Warnock Hersey, UL, etc. CSA is recognized for having developed very high/stringent standards and other countries have looked to CSA for guidance in standards and as in the US, has been accepted for use in the US as noted in the following. CSA is one of those things we Canadians can be proud of.
CSA International - Testing and Certification for products sold in the US
277/480 & 347/600 volts are normally industrial/commercial voltages within buildings/structures. Unless travellers go to overseas to Europe and eslewhere, we have the same voltages that RVers and homeowners will use in the US. Not sure what 220/460 is.... One thing that is confusing sometimes is that 120 volts can be referred to as 115 or 110 volts and 240 volts is sometimes 230 or 220 volts.