9100
Diamond
- Joined
- Nov 1, 2004
- Location
- Webster Groves, MO
Today someone asked me to look at a three phase outlet that I had hooked up. The service is 240 B phase grounded delta, the normal one in this area. The distribution panel has three wires coming in and two pole breakers as are common. I assumed that the dual breakers were connected to the two hot leads and didn't check the voltage. I pulled the breakers out to look at the strapping, which made no sense. Then I read the fine print in the label and found that the box was for a high leg service with the midpoint of one secondary grounded instead of corner grounding. Looking at the straps, it appears that you can get 120, 240 single phase and 240 three phase from the same box simultaneously by the placement of breakers. Is that the idea, to do it all in one box? I got everything working but it was bewildering for a while.
Bill
Bill