We have about 10 of these exact panels in use every day. The Science building on my campus uses them for projects. They are fed from a 120/208 3 phase 50 amp breaker. Once in a great while a pot or power supply needs tweaking and out electronices techs take care of that. Ours also have a terminal for high frequency but I don't think that's worked in the 20 years I've been on campus.

[This message has been edited by deverson (edited 02-21-2007).]