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From: markp on 18 May 2010 20:27

"kevin93" <kevin(a)whitedigs.com> wrote in message
news:f493483d-4fd2-4c8b-b271-8c425c94691f(a)h37g2000pra.googlegroups.com...
On May 16, 3:04 pm, Phil Hobbs
<pcdhSpamMeSensel...(a)electrooptical.net> wrote:
> op...(a)hotmail.com wrote:
> >> We found that even with 4mil spacing breakdown didn't occur until
> >> about 2KV for surface traces and about KV for buried traces on
> >> ordinary FR4.
>
> > Kevin, thanks. Information like this, to me at least, can be more
> > valuable than what some table or calculator returns IMO.
>
> > On May 16, 1:03 pm, kevin93 <ke...(a)whitedigs.com> wrote:
>
> Of course there's temperature and humidity to worry about, and minor
> wire irregularities that cause electric field concentrations....
>
> Cheers
>
> Phil Hobbs

Also buy PCBs with a high Comparative Tracking Index (CTI).

Mark


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