If this is a design issue, use a 1 mil per volt rule for trace spacing.
Clear any nearby copper, including pours & planes from under the
offending pins/traces.

If attempting to salvage boards, the dielectric of conformal coating is
higher than air, adding to your insulation value.

Regards-
Michael Howell
*Howell Electronic Services <http://home.earthlink.net/%7Emhowell777> *


Brooks,Bill wrote:

>It's Monday... had your coffee yet?
>
>I'm trying to gather together some potential solutions to High Voltage
>breaking over and arcing between traces on board. The things I know
>contribute to this are things like, too little spacing between traces on the
>surface or in the inner layers, sharp points on traces, board cleanliness or
>the presence of contaminants between the potential voltages.
>It was suggested that conformal coating the boards after a real good
>cleaning might improve the insulation resistance between traces, has anyone
>done this successfully? Do you have any other ideas short of a re-layout of
>the board that could perhaps repair a problem like this?
>
>Any ideas are most appreciated.
>
>Bill Brooks - KG6VVP
>PCB Design Engineer, C.I.D.+, C.I.I.
>Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510
>Datron World Communications, Inc.
>_______________________________________
>San Diego Chapter of the IPC Designers Council
>Communications Officer, Web Manager
>http://dcchapters.ipc.org/SanDiego/
>http://pcbwizards.com
>
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