You can bet I wouldn't want to argue with 347 volts! [Linked Image]

Looking back at the transformers:
Quote
In a catalog listing for Jefferson Electric three-phase ventilated dry-type transformers…
‘General Purpose—Latin American Voltages' 460 V — 220Y/127 V
I can see that the 220Y/127 arrangement must be the European influence on many Latin American countries, but I wonder how 460V came to be a standard there?