On Apr 4, 12:31 pm, "har...@[EMAIL PROTECTED]
" <har...@[EMAIL PROTECTED]
>
wrote:
> I'm finding that we're spending many thousand dollars on UL testing
> for safety when we are using a UL listed open frame power supply, a UL
> listed power switch, a UL listed power inlet, and a few pieces of
> wire. Meanwhile, I can buy a "wall wart" external switcher for $10 or
> less that is UL listed.
>
> So, the questions are:
>
> 1. If we were to use a UL listed enclosed power supply with an
> integral AC inlet (think of a desktop supply for your laptop computer)
> and place it inside our product with a hole in the rear panel allowing
> access to the inlet, could we substantially decrease the cost of
> testing for compliance? This would be similar to the power supplies
> used in desktop computers where the supply is totally enclosed. Just
> DC wires come out one side and an AC inlet shows through the rear
> panel of the PC.
>
> 2. If we could reduce compliance testing costs through the use of
> such a power supply, who manufactures supplies like that in the 30 to
> 50 watt range? Or, should we just stick a desktop supply inside our
> product and provide brackets that keep it from flopping around in our
> cabinet?
>
> THANKS!
>
> Harold
This is a tough question to answer. I guess a prime question would be:
Do you want or need to have the UL mark on your final product. If yes
then UL will still need to evaluate this power supply for use in your
product. Most of these power supplies do not meet Class 2 requirements
so equipment connected to them could still be considered to need
evaluation to comply with the requirements of the standard.
Cheers,
Nick
www.easycomplianceguide.com
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