ECN Forum Forums Photo Discussion Forums Photos for General Discussion Primaries of pole mounted transformers

Greg's image shows the Multi Grounded Common Neutral (Refered to as "MGCN") "version" for 1Ø Medium Voltage Distribution.

I see this type of Primary feeds in Nevada (Las Vegas), and in rural areas of Oregon.

Most of California - at least Southern California, have L-L Primary Feeders for 1Ø Distribution.

Some areas with 12470Y/7200 3Ø 4 Wire Primaries will connect L-N, but this is not a Common Neutral type system - as the Grounded Conductor is not common to both the Primary and Secondary feeders of a given Transformer.

Here are a few Schematics from the Tech. Reference section, covering Residential Distribution Systems:


Fig. 1.1: Multi-Grounded Comon Neutral (MGCN)


Fig. 1.2: 3 Phase 4 Wire Distribution - typical in my area on older 4KV Circuits, and some newer 12470Y/7200 4 Wire Circuits


Fig. 1.3: 3 Phase 3 Wire "L-L" Distribution - typical in my area.

More images may be seen at Residential Distribution Systems page.
Go to the "Menu" at the Tech Reference area, and select from there

Scott

BTW: I just found out the links at the "Menu" need to be re-directed, so I perform the necessary tweeks ASAP.