I am working on a job where we are retrofitting panels in an old school and pulling new feeders.

The service is 120/208 3-Phase.

The specs call for us to use booster transformers to feed one distribution panel making it 240V 3-Phase (No Neutral).

There was an existing section of the MDP that was fed via transformers to accomplish the same thing.

The specs call for (3) 7.5 KVA transformers (heavy little suckers) to be used to "boost" the 208V to 240V.

The transformers have one primary winding (H1 & H2) and two secondary windings labeled X1-X2 & X3-X4.

The label reads: Primary Secondary
240V 32V
120V 16V

I have never done this before and was wondering if any of you have and if you could tell me how to accomplish this. Or,in other words, which X's, H's and lines do I connect together? By the way, this is on a 400A feeder.