3 Wire Primary? I don't see many of those on single phase systems, not around here anyway.
Are you kidding me?
So Cal Edison here in sunny California has had a major love affair with 3 wire delta primaries for years!! There are always exceptions, though: my palatial estate (ok, the dump I live in) is served with a 4kv wye primary, (feeding an unfused transformer!) but there is a 34.5kv class delta primary over it, which serves a lot of the neighboring homes.
But if you're in the LADWP area, I think most of their service was/is wye. Any POCO guys here who can confirm/deny this?
