Quoting myself from the other thread:
Quote:
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Originally Posted by BrianG
Personally, floating one of the cases away from ground is NOT the right way to do it. It works, but there is a potential for something internally to go wrong (like a wire coming loose) and make the case float at whatever circuit it is touching. This is why everything with a metal case is grounded. Either that, or you'd have to wrap the internals in something non-conductive and then put that in the metal case, but what's the point in having two cases? Or, remove all the internals and put them in a completely different case with only the more negative supply ground referenced.
To do this "right" with minimal work, you'd decouple the supply output ground from the case altogether (technically, this only needs to be done on one supply), tie both cases together, ground both cases, and to make things more tidy, internally create jumpers of sorts to tie the mains inputs together (just so one power cord is needed).
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'Nuff said.
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