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High voltage traces on PCB... again

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edaenrico

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Hi folks,

I refer to the thread posted by archiees, on the 6th of September 2005, on "High voltage traces on PCB".

I read and understood that post, except one thing:

What about clearance between high voltage traces residing on different layers?

I'm routing an FR4 board, 2 layers. The board thickness is 1.6 mm.

I got 2 traces crossing each other, the first is on the TOP layer and the other on the BOTTOM layer.

Are 1,6 millimeters enough?

Thanks in advance,
Enrico
 

Yes that will be enough because PCB will act as an insulator and the creepage will be calculated all the way through the PCB surface.

Hope you get what I am saying.

Ricky
 

Anonymous_Ricky said:
Yes that will be enough because PCB will act as an insulator and the creepage will be calculated all the way through the PCB surface.

Hope you get what I am saying.

Ricky
Click to expand...

Hi Ricky,

thanks for your explanation.

I indeed verified that the Dielectric Strength of FR4 is much higher AIR.


FR4
----
source: https://en.wikipedia.org/wiki/FR-4
Dielectric strength = 20 kV/mm = 20 MV/m = 500 V/mil

AIR
----
source: https://en.wikipedia.org/wiki/Dielectric_strength
Dielectric strength = 3 kV/mm = 3 MV/m


thanks,
Enrico
 

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