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Posted by Rick Merrill on 02/02/07 01:42
Larry in AZ wrote:
> Waiving the right to remain silent, Rick Merrill
> <rick0.merrill@NOSPAM.gmail.com> said:
>
>> UL requirements (Underwriters Labs) have moved most new US electronics
>> to (just as you suspected) Not have a real mains switch, but instead an
>> electronic button that triggers a relay... UL regs also have moved all
>> low wattage devices to have a "wall wart" (separate power supply) and of
>> course those things draw some power all the time.
>
> I believe the move to wall warts is more likely the desire of the equipment
> manufacturers than of the UL.
>
> If you build your power supply into your device, then you must go through
> expensive UL testing of your box.
>
> If you opt for a wall wart, which is pre-tested and separate, then your box
> is exempt from UL testing.
>
> Another benefit is that your box is smaller...
>
Exactly what I failed to convey by my use of the word "moved." ;-)
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