Hello again. Been a while since I've posted but have been reading posts regularly. I've been quite busy for the past year plus, just trying to get the shell up and heated to the studio build. See vibrationsrecording.com even though I haven't updated it for a while now. anyway, time to get some ac power in there. I'll be bringing in single phase 200amps 60hz ac (local co. wouldn't do three phase even though it's a commercial service). My wife and I share the building so she gets 100amps "dirty power" to her piece (I'm also going to use that feed for my "dirty power"). I'm running the other 100amps to a "clean power" panel in my machine room. Both 100A feeds off the 200amp service will carry all three wires (2 hot and the neutral) to each respective 100amp breaker box. To make mine a "clean box" I want to put an isolation transformer in line before the "clean" box in my machine room to break the "dirty" ground. My sparky agrees that a single phase, 15kva (80% loss typical), 240/120V 100amp in and 240/120V 100amp out is desireable. This leaves plenty of room for eventual/possible growth even though I don't anticipate needing more than 60 amps total full bore at this time. The electrician suggested I find the right unit and he would graciously order for me so that i can pay his cost only. He's delt with these for cows/farms, not recording studios, though there may be no difference for all we know???Problem is, I've been researching for weeks now online and don't seem to be able to decide which brand/which type of isolation transformer to buy?? The Furman rigs look great but i want just one to hardwire inline before the breaker box. the furman rig and others are too small and designed for after the box. So.....Toroidal iso trans., sheilded,...... Acme, Temco, GE, TSI power, Hammond power, Piltron, others???... I'm in need of some direction, suggestions???? I see many companies build to order though "of the shelf "would likely be less costly. You guys have been a great resource before and i hope you can help on this one.