Another thought: Is it a good thing or a bad thing that this power supply doesn't have a ground (earth) to mains??
DC shouldn't have earth, should it?
You mean a ground lug, like the 3rd pin? If so, that's a chassis ground. If something shorts out inside the case of the PSU, the juice returns through that line. I wouldn't worry about it too much in a wall wart type power supply.
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