Reverse Connected Transformers
To The Electrical Industry,
Recently & more than
once, we have been asked the question
“can a standard step down dry type
transformer (<600V) be reverse connected
in lieu of using a step up transformer.
For example, can a 480V, 3Ø Δ to
208Y/120V, 3Ø transformer be connected
as a 208Y/120V, 3Ø primary to 480V, 3Ø
Δ secondary”. We have researched this
issue & have provided the following
links & pdf file to help educate us all.
The pdf file has bookmarks, & includes
excerpts from the NEC, IEEE, Square D &
ACME. This file & these links are not
necessarily our opinion, but are offered
as educational material only. We have
also embedded a link to a very
informative website regarding
transformers, which also links to many
other transformer sites. Also, we
submitted this question to Mike Holt’s
forum, & have embedded links to these
forums. We have found this issue to be
quite interesting, & we hope you enjoy.
Delta Transformer Document
Mike Holt Forum
Mike Holt Forum
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