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From: "Frithiof Andreas Jensen"
Subject: Re: FR-4 and HV
Date: Wed, 18 Sep 2002 11:46:54 +0200
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
"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 and
> recommendations on the usage of FR-4 for long term HV insulation and the
> 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 standards
for office equipment with detailed recommendations and formulas.
The distance depends heavily on the orientation of the field with respect to
the material, the environment (dirt, humidity, moisture, air pressure etc.)
and if the field is parallel to the material, it is preferably to cut slots
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!
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