Subject: Re: FR-4 and HV
Date: Sat, 21 Sep 2002 09:24:54 -0700
Organization: SCN Research of Tigard, Oregon, USA.
NNTP-Posting-Date: Sat, 21 Sep 2002 16:25:07 +0000 (UTC)
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Anyone else have any comments, all I can find is IPC-2111, which is quite
lacking in engineering details, on page 39, table 6-1(if memory serves
"Frithiof Andreas Jensen" wrote
in message news:email@example.com...
> "Leeper" wrote in message
> > I'd like to find some information on the web for understanding the long
> > effects of the degradation of FR-4 to high strength electrical fields
> > recommendations on the usage of FR-4 for long term HV insulation and the
> > maximum
> > recommended field strength/density for long term reliability.
> The place to look would be in "electrical safety standards documents" - I
> used to have an EN 950(something) regarding the electrical safety
> for office equipment with detailed recommendations and formulas.
> The distance depends heavily on the orientation of the field with respect
> the material, the environment (dirt, humidity, moisture, air pressure
> and if the field is parallel to the material, it is preferably to cut
> in the material to increase creepage distance - at least below 5 kV or so.
> In any case: If you get corona the material will fail!