Ken

Re your statement "If there is a standard that says that isolated and non-isolated outlets should not be mixed then please let me know."

The IEE Special Locations Guidance Note 7, chapter 10, page 65, says "Socket0outlets of other systems (TN-S or TT) within a Group 2 location should be clearly and permanently marked to distinguish them from the IT system sockets outlets"

We have done exactly this within our newly refurbished NICU, where the sokets are labeled for non-medical use e.g. cleaning equipment etc..
Isolated sockets are then labeled medical equipment use only as cleaner equipment would cause unwanted tripping.

Mark