> Question still stands, given that a component that is properly designed i=
nto a
> circuit can still fail for various reasons, what can I do at the PCB leve=
l to reduce
> or eliminate arc tracking?

Short of milling slots like is done on mains supplied power supplies, I can=
't think of anything you could do.

The only other thing to do is massively over-rate components so there is mi=
niscule danger of the problem starting.=20

I guess some form of fuse could be incorporated, but very low normal operat=
ing currents will require an electronic fuse that will use some more curren=
t ...
--=20
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--=20
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