No Transient/input filtering - Illegal? or bad design?

[c_hegge]

I see a lot of PSUs on these forums with no input filtering (or very little input filtering, like only Y-caps with no coil or X-cap). Are these PSUs actually illegal, or is it just bad design? I've seen some people say they are illegal in most counties, but if so, why do I see so many here?

[everell]

Re: No Transient/input filtering - Illegal? or bad design?

Look for CE on the label. It means "Chinese Export"

[Th3_uN1Qu3]

Re: No Transient/input filtering - Illegal? or bad design?

Legal or not, you find them everywhere.

[kikkoman]

Re: No Transient/input filtering - Illegal? or bad design?

legally, a device should neither emit nor be affected by harmonics.
that doesn't necessarily mean they need an input filter, but i doubt they'd pass a thorough FCC test.

but i doubt it's strictly ILLEGAL to run those. i can however imagine that *some* insurances would refuse to pay if that thing caught fire (and they could prove it), you'd have to sue the manufacturer or importer for damages. (good luck with that)