I have worked with AC Power control for about 15 years, and have seen all
kinds of components fail that were spec'ed well according to datasheets.
Smoke, charring, and ozone effects are pretty common. Often, post-mortems
have shown that the devices' ratings mean very little when after years of
use, contaminants of all sorts coat component surfaces, or high humidity has
broken down a dielectric coating. They almost always do what they're
supposed to when they're new and clean. Real-world is another story.

Chris

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Alexandre
> Domingos F. Souza
> Sent: Sunday, December 16, 2001 5:27 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE] question about light dimmer circuit
>
>
>         Meow,
>
> >Just a note, any voltage above 100VAC RMS and 150VDC  I use
> grater than 1W
> >resistors regardless of power, as they have a higher voltage
> rating and do
> >not arc over, been caught on strings of 1/4W, one fails and
> they all go
> >flash.
> >Just remember all good component suppliers supply the
> working and breakdown
> >voltage for their resistors, use the catalogue.....
>
>         Never seen this happens, even in noisy lines (subject
> to high voltage spikes). But nice to know ;o)
>
> >May the Data sheet always be with you ;o) <said in best
> dathvader voice ;o)>
>
>         (inspire)...(expire)...(inspire)
>
>
> ---8<---Corte aqui---8<----
>
> Alexandre Souza
> taito@terra.com.br
> http://planeta.terra.com.br/lazer/pinball/
>
> ---8<---Corte aqui---8<----
>
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