I hope this is not beating a dead horse, but there is an interesting synthesis that was bound to occur somewhere in the world. On 220Y/127V, that seems to be a fairly standard voltage in Central America, but typically at 60Hz. Maybe C-H can confirm or dispute that supposition.

In a catalog listing for Jefferson Electric three-phase ventilated dry-type transformers…
‘General Purpose—Latin American Voltages' 460 V — 220Y/127 V http://www.jeffersonelectric.com/pdf/3-PhaseVent.pdf pg 5

220Y/127V 60Hz in Central American voltage is likely found where 3ø service is brought into larger buildings. This may be the case for some of the Caribbean Islands too. [It’s worth noting that for North America, 127V is also the upper end of permissible voltage for nominal 120V circuits.]

Note that the plain-vanilla North American version of this type of transformer is rated 480 — 208Y/120V {and occasionally 480 — 240/120V 4w ∆.)

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[This message has been edited by Bjarney (edited 09-17-2003).]