I have quite a few power supplies and I think they are all isolated from
ground, ie the metal enclosure is safety grounded to the house mains supply
(because they are Class 1 equipment in which the grounded chassis provides
the main barrier to shock hazard), but both low voltage output terminals are
floating which is provided by the mains transformer. Only plug top
transformers, wall warts, power cubes and other plastic-enclosed power
supplies have no mains earth connection in my experience.
David
G3UNA
This excludes such
historical anomalies like the early Astron power supplies that didn't have
the chassis grounded
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