>> You sure about that? I bet I could cause a real fire with 
>> a UL-approved
>> 12V 1.5A wall wart, and not once exceed the ratings.... 
>> any takers?

> Of course you can, Spehro. But I'll bet the fire won't 
> break out in the
> wall wart.

This could be a challenge.
If you hold the output current at JUST below fusing / 
trip-out current what is the dissipation in the psu. Hold 
mains input at worst case point - probably at maximum 
allowed value.
If the wall wart does not specify how it is allowed to be 
"housed" them encase it in Perlite :-).

eg
Place wall wart in mains distribution board (what you call 
them there I don't know.
Load to worst case point.
Power at worst case mains.
Tape thermocouple probe to box.
Pour 100 kg (50 lb) bag of Perlite over wart and dis box and 
all and observe the fun.
:-)


        Russell




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