knuckles1978
New member
- Location
- St. Louis, MO
Hey there, I'm new to the forum so I do apologize if this is posted inthe wrong area. I was recently asked to look over a friends panel in an olderSt. Louis city repair garage for installation of a piece of equipment. Themachine which he would like to install requires a 3phase 480V Wye infeed @roughly 60A. The 200A 3phase panel in this building, which is currently notbeing used by any other devices, has a 277V corner grounded delta infeed. Ihave ran into this in a couple of other circumstances however did not create anissue with the task at hand. In this instance though, considering he needs toget this to the desired 480V outfeed, I have been thrown a little off track!Haha. After much searching, finding a transformer solely for this purpose doesnot seem to be a cost effecient option, and pretty much not an option at all.My next though was perhaps to set him up with a auto-transformer bank to stepthe infeed down to 240V, then run through a transformer to get to 480V. Thequestion here though is, will that grounded leg present a problem attempting togo this route? Does anyone have a better solution to this that I'm possiblyoverlooking? I'm sure by this point I have completely over-complicated thesituation, so I am turning to you guys (and gals) for any and all help andassistance you can provide. For those unfamiliar with thisefficient yet pesky set up, it is a 3 wire set up that reads 277V across legs and 277V to ground on twolegs, yet 0V to ground on "B" leg. Yep, fun times! Thanks in advance.
Todd
Todd