3 wire AC would have been 2 X 127V + neutral?
I was thinking more along the lines of American-style 110/220V, but 127V is a possibility.
Perhaps these places had European-style 127/220V 3-ph distribution along the streets but each house took only two phases, i.e. House #1 on A & B, #2 on A & C, #3 on B & C etc.
WOuld it make sense that with Irish independence newly gained at that time that attention might turn toward European systems rather than relying on established British equipment?
