Two of the 240 corner grounded delta have been on an elementary school and a private school that was formerly an orphanage. Both had small a\c loads - split systems and small rooftops -no chillers. Both systems served lights and receptacles.
If you have a delta system feeding line-to-neutral loads, it's not corner grounded, but center-tap grounded. The "main" winding has the tap, just like your 240/120v. home, and the other two windings meet at the "high leg".
