Nick— Sounds like the work could make for some interesting and profitable repeat business. A minor aside—on ANSI terminal markings for three-winding transformers… H1-H2-H3 primary; X1-X2-X3(-X0) secondary; Y1-Y2-Y3(-Y0) tertiary. Anther oddity for this type of transformer is that on the secondary and tertiary terminals, there will be typically six 120-volt ø-n measurements, but also you’ll be able to sort out six 120-volt ø-ø readings. The two 208Y/120V “groups” are interleaved, for lack of a better term.
