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Subject: Isolations on inner layers
Author: Mihai Vintila <[email protected]>
List-Post: [email protected]
Date: 3/16/00 7:34 PM
Hello,
I have a question concerning isolations for hazardous voltages on inner
layers of a multilayer PCB.
The material is standard FR4.
I have read the EN60950 spec and it seems like for copper on different
inner layers an isolation of 0.4mm would be good enough. Now what I could not
figure is about traces on the same inner layer. In this case an isolation of 0.4
mm is as good as it is between different layers, or should I take into
consideration the manufacturing errors (impurities, air bubbles, a.s.o.) and
make a bigger isolation, but how much bigger?
The voltages I am working with are some of them TNV1 and others 220VAC
(mains).
Many thanks,
Mihai
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