Locating my source, I only noticed 2 transformers, yet I wanted to verify that the drop was (as I was told correctly) indeed 3-phase 240v. I measured 240v.between phases A,B&C, but when I measured between V-lines and neutral, A=120v. B=120v. and C=neighborhood of 218v. A couple of days later, a TXU field operator told me that was an open loop Delta configuration. Tonite, I cracked open an old text of mine and indeed found out that 3 wire 3 phase service can be derived from 2 transformers. Of course I'm only running A,B, & neutral for 240/120v. service. But the textbook drawing only shows 3 wire service. Can anyone tell me or hopefully show me a diagram how a grounded neutral can be added to obtain the voltages I encountered?
