When I worked for a major PC manufacturer we started out with conductive
coatings on our laptops. Paint over spray was a problem that we had to
address. Also, the coatings did not always touch at all points due to bowing
of the plastics. We were also concerned with the long term effects of
servicing on the conductivity. Many times on the OATS we had to remove and
replace covers just to ensure we had good contact so we would comply. It was
a pain.
We found a much cheaper way of conforming with EMC. Source suppression. It
is possible to suppress the noise at the sources and eliminate a metal
enclosure. One good source of knowledge in this area is Ken Keenan (813)
544-2594. Other gurus are also available. Ken gave our designers a two day
course specially designed for us. Once the designers finally learned - some
took longer than others - that there are no short cuts in source
suppression, we finally got a compliant product out the door without
conductive paint.
Once last remark. Conductive coatings may soon be a thing of the past in the
EU due to recycling requirements. Conductive coatings cause a big problem in
that area. Check it out.
----------
From: JENKINS, JEFF [SMTP:[email protected]]
Sent: Tuesday, April 13, 1999 12:07 PM
To: 'emc-pstc'
Subject: Conductive Paint
Hello Group,
My company is proposing to use conductive paint on our enclosures,
and I
would like your input as to the acceptability of this vis-a-vis
protective
earth bonding of enclosure panels. I am interested in the
perspective of
both European and North American requirements.
This should be a generic question, but if it helps, here are the
standards
we use:
EN 60950 / IEC 950 / UL 1950 / CSA 950
EN 50178
UL 1012
CSA C22.2 No. 107.1
Regards,
Jeff Jenkins
Senior Regulatory Compliance Engineer
Advanced Energy Industries, Inc.
Fort Collins, CO USA 80525
Opinions are my own and not necessarily shared by Advanced Energy
Industries, Inc. or its affiliates.
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