Transformer wiring clarification

Not open for further replies.


New member

This is my first post on this forum. I have found it very informative.

I have a Doall bandsaw that requires 575 volt service. I have 480 in my shop.
I an attempting to use to single phase transformers an connect them in an open delta configuration for a three phase operation.

The drawing is attached. I hope it is large enough for your all to be able to read.

This is all I have to go from. I have been unable to find the "proper instructions" for the connections.

Here is my understand of the drawing:

  1. Line A connects to H4
  2. H2 connects to H3
  3. H1 connects to Line B and H1 from the second transformer
  4. X1 connects to X3
  5. X2 connects to X4
  6. X4 to LOAD
Repeat the same steps for the second transformer.

Thanks for any help with this project.


Dennis Alwon

Staff member
Chapel Hill, NC
Retired Electrical Contractor
I am closing this thread, in accordance with the Forum Rules.

This site is designed for:

  • Contractors
  • Electricians
  • Engineers
  • Inspectors
  • Instructors
  • Other electrically related individuals
* This NEC? Forum is for those in the electrical and related industries. Questions of a "How-To" nature by persons not involved in the electrical industry will be removed without notice.
If you feel this action to be in error, feel free to contact me via PM to explain.

A reminder to all members, if you see a questionable post, feel free to report it by clicking the
button at the bottom left corner of the post.
Not open for further replies.