At 09:00 AM 9/4/97 -0600, you wrote:
>Martin R. Green wrote:
><snip>
>> I realize they eliminate the designer's need to get safety approval for
>> their hardware....
><snip>
>I don't know if the rules have changed in the last few years but there
>used to be a "Catch-22" in the CSA and UL (North America) rules.  These
>"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.)



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