So, punchline is, use cords that are properly rated for both voltage and amperage.
I have a sort of related question: some here in the States advocate running their amps at 240v for better performance (of course, assumes that the component is either a 'universal' one where the voltage can be set to 120/60hz or 220/50hz or a component designed for the European (and Asian?) market. That in turn would entail some professional to run a 240 volt line from the panel and a different receptacle; i would assume that the power cord between the component and the wall receptacle would then have to meet the qualifications discussed in this thread.
Two questions: first, is there a sonic improvement to doing this, either for high current solid state amps or tube amps like my Lamm SET?
And second, is there any issue re the difference in the carrier frequency- here in the States it would be 240 at 60hz rather than 220 at 50hz?
Don't worry, I'm not doing this myself, and not doing it now, just curious, since a friend was in the process of setting up some high current amps to run this way here in the States....