>>"Wall warts" are approved only as long as they are used
>"stand-alone".
>>i.e.: powering NOTHING (strange, but true).  As soon as it's attached
>to
>>(or plugged into) something it was deemed a "new" and unapproved
>>device.  You had to go through approval testing with both your
>product
>>and the wall-mounted power supply and both had to pass.  If this has
>>changed I'm sure somebody will let me know.
>>--Matt
>
>In Canada, only the fire hasards and electrical shock is checked by
>the CSA.
>Normally, all equipment below 40 volts doesn't need to be checked.
>(The car equipment with 12 volts is an example.)

In the US I don't think that the government needs to approve anything
about a product before it can be legally sold other than it's potential
to cause RF interference.  But in the litigious USA (of, by, and for
trial lawyers) it's pretty much essential to obtain product liability
insurance and the insurance company will likely require UL or similar
approval.

It isn't hard to conceive of a wallwart-powered product that is a
substantial fire and shock hazard, even if the wallwart isn't.