Have a look at FR4 spec sheets. From what I remember
from a while ago, FR4 stands 20-25KV through a 1.6mm (1/16")
thick board. You should have no problem as long as there are no Vias
or other holes in the vicinity. PCB manufacturers should be able
to send you a spec sheet or do a Google search.

Jim Thornhill

----- Original Message -----
From: "Jimmy Blier - Paradox Security Systems" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, November 25, 2003 8:55 PM
Subject: [DC] isolation factor


> Hi everyone,
>
> I need some input regarding a problem I have.
>
> I have 2 traces that can carry a very voltage, if a surge occur. (above
1100V).
>
> I know what spacing I need to place them apart if they are both on the
same layer. (to pass the approvals)
>
> What if they are one on the top and the other on the bottom layer of a
0.062" pcb? (but closer then they should be, if they were on the same layer)
>
> What is the isolation factor provided by a FR4 PCB material & is it a
viable isolator?
>
> Both traces need to be in the same area by design and they look a little
like this.
>
>    _
> *********
>
> Can someone give me some information or direct me to a documentation
source regarding such layout situation?
>
> Thanks,
>
> --
>
> Jimmy Blier
> Senior PCB Designer
> Paradox Security Systems LTD.
> 780 Industrial Blvd.
> St-Eustache, Quebec, Canada J7R 5V3
>
> Phone: (450) 491-7444  (((Ext:239)))
> Fax:  (450) 491-7551
>
> <mailto:[log in to unmask]>
> <http://www.paradox.ca/>
>
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