Sandsnow: a few years back I ran into that with a guy who had a monsterous aquarium set up. All his pumps were grounded and his old house was 2wire "ragwire". No grounds available anyplace. We got called to convert his receps to grounded and eliminate his plug in adapters. We thought about going the GFI route but decided to call the AHJ for an opioion (due to the aquariums being listed in 250-114). AHJ said no way. Our saving grace was that this room was above the unfinished basement. We just pulled new ckts and left the old stuff as is.
