The transformer banks are in a conditioned room that is maintained at 70-72 degrees F at all times. Actually I have two sets of transformer banks (4 transformers split across two services) feeding one large building. The banks are about 600 ft apart from one another though.
I am planning a project to replace some of our transformers that have been in service for many many years and are starting to show their age with the insulation on the windings going south. We are doing a boost from 480 3-ph to 600 3-ph using a couple of Square D dry type(50S3H) single phase...
