Same around here, the original transformers here from the 50s were/all are rectangular. So are the three phase transformers, but Peco doesn't hang many of those around here anymore, instead using three separate transformers.
Actually we have quite a few square and rectangular pole mounted single phase transformers around my area as well, but they are older. I would guess some are from the 50's and 60's era when the cases were painted black or green but I have seen a few painted grey which seemed the norm around the 70's, unless of course they were "rebuilts".
All 3-phase transformers remain rectangular, and I will try to get pix as well in the next few days as well.
A.D
I don't think I've ever seen a US pole mounted three phase transformer before in real life. (Post those pics guys
)
I remember seeing a photo in an old book of a pole mounted transformer: it had four secondary bushings and four wires extending down to feed the secondary rack. There where both four wire and three wire service drops extending from the secondary rack. I thought immediately that it was a three phase pole mounted transformer. The weird thing was that I could only see two primary bushings (the side mounted kind) and two primary wires extending down from the primary crossarm and cutouts. How could that work? I have observed that modern single phase (and single primary bushing) transformers that are connected phase to neutral have the primary grounded neutral conductor tied to the center tap of the secondary. (essentially the primary and secondary neutrals are the same wire) But I didn't think that the three phase transformer in the old photo would be wired this way. (It looked to be connected the same way as a single phase transformer would be to a delta primary)
Any Ideas?
(digging deep in my memory, I believe the book was on appliance repair, early sixties vintage, and it had a few pages on how electricity is delivered to homes)
