Connecting Two AC/DC Power Supplies in Parallel

• If two power supplies have a different common, then they are not in parallel.
• If two power supplies in parallel have different voltages, then the one with the higher voltage will supply all the current, as the other one's output will be reverse-biased.
• An RFI filter will have no effect on a power supply voltage, as the strength of the power supply far overcomes any contribution from RFI.
• If an AC supply is in parallel with a DC supply then one of them's circuit protective device(s) will operate, disconnecting them.

So the questions are meaningless.

I think the Q is just very badly worded.
I think it's asking 'can the same mains supply go to more than one AC to DC converter?'

I think it's asking about parallelling inputs not outputs...but hey whaddoo I know I just a cat?

IF this is what's meant, then the answer is of course yes, as the mains power in a building is connected to many different bits of equipment all in parallel across the same mains supply. And if the converters meet all the relevant EMC spec's they they shouldn't need extra filters as they won't be injecting crap into the mains supply (yeah right)
Del