Been there, done that, bought the T-shirt.

UL's purpose is safety, and they are only interested in whether
a product will be a fire hazard (primarily) or a safety hazard
(shock, etc). They will test the overall safety of the product,
with little interest in how it is fabricated, outside of flammability.

As incredible as it sounds, UL doesn't even care if the product actually
does what it claims, although CE has some operational standards, such as
static protection.

I have designed many products in which PICs were used and they all
passed UL, CSA and CE .

Just design it with care, as if your dear Mom was gonna use it.
If you want to perform the extra step, get an independent testing
lab to perform operational tests and provide written certification.
These are all over, Atlanta has several, Boston more than that.

--Bob



Zipwize@AOL.COM wrote:

> Hi All,
>
> I have done some minor controls of products that have been UL, CSA, CCC approved and CE Marked. The controls did not include safety shutdown circuits. I was wondering how difficult it would be to have the safety shutdown controls on the PIC and get it approved by the agencies. The product would be a welding power supply. The safety circuit cuts the bias supply and opens a contactor relay.
> The shutdown is caused by excessive output voltage, or over temperature. I save some cost by putting this in code instead of analog comparators.
>
> Any shared experiences are appreciated.
>
> Fred
>
> --
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                Bob Axtell
        PIC Hardware & Firmware Dev
          http://beam.to/baxtell
              1-520-219-2363

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