PCB track spacing (HV)

keyne · 29th October 2004, 10:58 AM

Hi,

i am searching for information on required PCB track spacing at higher voltages.
I have 700 VDC on this board..

only thing i found so far was a recommendation of 0.12mil per volt.

a pointer to "official" information would be great.

Thanks alot!

Keyne

BrianL · 30th October 2004, 04:05 AM

I recall from years gone by that there is a UL or CSA or
other standards org. spec about this. Generally it
comes up when designing boards for switching power supplies.
I don't have ready access to that information any more. Sorry.

Mike Gergen · 30th October 2004, 04:10 AM

The spec is a minimum of 8 mm spacing from 400 to 1200 Volts peak

thespeakerguy · 1st November 2004, 04:57 AM

On FR4, I recall the breakdown being about 70V per mil, but design to 10V per mil.

You would need 70 mil spacing.

29th October 2004, 10:58 AM	#1
keyne diyAudio Member Join Date: Jul 2003 Location: earth	PCB track spacing (HV) Hi, i am searching for information on required PCB track spacing at higher voltages. I have 700 VDC on this board.. only thing i found so far was a recommendation of 0.12mil per volt. a pointer to "official" information would be great. Thanks alot! Keyne

30th October 2004, 04:05 AM	#2
BrianL diyAudio Member Join Date: Mar 2002 Location: USA	I recall from years gone by that there is a UL or CSA or other standards org. spec about this. Generally it comes up when designing boards for switching power supplies. I don't have ready access to that information any more. Sorry. __________________ bel

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30th October 2004, 04:10 AM	#3
Mike Gergen diyAudio Member Join Date: Sep 2004 Location: Elk River MN	The spec is a minimum of 8 mm spacing from 400 to 1200 Volts peak

1st November 2004, 04:57 AM	#4
thespeakerguy diyAudio Member Join Date: Feb 2001 Location: Silicon Valley	On FR4, I recall the breakdown being about 70V per mil, but design to 10V per mil. You would need 70 mil spacing.

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