BPrescott
Electrical
- Mar 13, 2006
- 7
At a neighboring utility we discovered a very unique connection on a three phase O/H bank. The coneection was open wye-open delta one two single bushing pots. The secondary had 480v L-L with one leg split to get 240v. The oddity came where the one leg was slipt was get 240, the utility also claimed that configuration would give them 120v. They called it an "A-frame" configuration. Has anyone heard of this and possible have a wiring diagram or vector diagram to explain where the 120V comes from?
Thanks!
Thanks!