Badgers, Isolated Power is not required by the NEC or NFPA 99, it is an option in both cases, as you indicated.
I know North Carolina, and I think Florida, do require Isolation power sources in their proceedure rooms.
Other States or locals may option for GFCI's for their 6ma fault trip levels. (The same as "standard" isolation thresh holds)
If you think about it, why would you introduce "non isolated power" into a room that is already served by an isolated source.
It would definately defeat the purpose.
So, if you have installed a critical isolation source into the room, I would want the normal, or "second" critical source to also be isolation power.
Roger
[This message has been edited by Roger (edited 05-10-2003).]
