[BC] AC Voltage Drop

[mrfixit at min.midco.net]

Quoting "Milton R. Holladay Jr." <miltron at mindspring.com>:

> IIRC, there is a wye secondary and a delta secondary which wind up being 60
> degrees different in phase

I guess that's the basis for my question: how does 3-phase (120  
degrees between phases) become 60 degrees between phases?

Dave Dunsmoor