I have a 5 KVA 200-240 VAC 1Ø 2 Wire Primary × 120/240 VAC 1Ø 3 Wire Secondary Isolating Transformer with Faraday Shielding and Grounded Core, which is used for my Computer Equipment in the "PC Room".
The Transformer feeds an 8/16 space Square D NQOD Sub Panel, which contains IG kit and all that good stuff.
Have a few other Isolating Transformers which were parts of a 4 wire Wye Isolation setup. Three (3) separate transformers, which are also 5 KVA and shielded, but are straight 120 in, 120 out.
Use here and there to isolate a piece of equipment for testing purposes.
Scott35 S.E.T.