Spark-Gaps and clearance rules

Item Subject: cc:Mail Text Fellow Professionals I have another question regarding class II equipment. My power supply intends to use a printed wiring spark-gap for transient/lightning protection. It's inherent design requirements are such that the air-gap spacing are less than those specified f

Spark-Gaps and clearance rules

Hi Hans. You wrote, amongst other things.. < My power supply intends to use a printed wiring spark-gap for transient/lightning protection.> Not a good idea... Mains transients and lightning etc. have a very low source impedance. If the volts get high enough to switch on your spark gap, you won

Re: Spark-Gaps and clearance rules

On Wed, 23 Apr 1997 hans_mellb...@non-hp-santaclara-om4.om.hp.com wrote: > I have another question regarding class II equipment. My power supply > intends to use a printed wiring spark-gap for transient/lightning > protection. It's inherent design requirements are such that the air-gap > spacin

Re: Spark-Gaps and clearance rules

Hi Hans: Regarding your several questions: 1) Printed wiring spark-gap. This is a problem because the manufacturing variances of printed wiring makes the spark gap extremely variable in breakdown voltage. This is a further problem because when it operates, it creates a carbo

RE: Spark-Gaps and clearance rules

Below, Bruce Hunter assumes Hans Mellberg is using an air gap comprised of traces on a printed wiring board. When I first read Hans' message, I thought he was discussing discrete components. I have seen both used, but would like to ask you, Hans, to clarify your application, before we get off on

Re: Spark-Gaps and clearance rules

On Wed, 23 Apr 97 11:33:00 -0700, hans_mellb...@non-hp-santaclara-om4.om.hp.com wrote: >I have another question regarding class II equipment. My power supply >intends to use a printed wiring spark-gap for transient/lightning >protection. >Is anyone familiar with exceptions to the clearance rules