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Date:	Fri, 20 Jul 2012 21:07:48 -0500
From:	John Griessen <john AT ecosensory DOT com>
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To:	geda-user AT delorie DOT com
Subject:	Re: [geda-user] footprint with rectangular through holes ?
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On 07/20/2012 08:00 PM, Nathan Stewart wrote:
> Do any of the budget fab houses do internal routing?

Sure. Every power supply board with UL or ETL listing needs
slots for isolation between volts and ground.  It provides surface
path distance to prevent conduction due to dust and salts in the air
collecting on pcb's. It's a probabalistic treatment for long years of
use not causing a fire hazard.

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