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From: John Woodgate
Subject: Re: UL Leakage Current Test - disconnecting Y-capacitors?
Date: Thu, 16 Jan 2003 20:40:52 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Thu, 16 Jan 2003 21:19:24 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Klaus Kragelund
wrote (in <881355e2.0301160640.43babf17@posting.
google.com>) about 'UL Leakage Current Test - disconnecting Y-
capacitors?', on Thu, 16 Jan 2003:
>I'm performing an UL leakage-current test. The test is conducted by
>removing the ground wire and connecting a amp-meter from the chassis
>(instrument ground) to either mains wire.
>This is fine - but what puzzles me is that our Q department says it is
>ok to remove any Y capacitors during that test. Anybody know the
>rationale behind that? If I were to build an instrument with many
>Y-capacitors in parallel the current drawn by these will be high and
>possible lethal if the ground wire was removed....
The current through the Y-caps is not included in the test because it
may partly hide unwanted and unnecessary leakage, which should be
But get the Q Dept. to show you the clause in the standard which tells
or allows you to disconnect them. Some standards do, some don't.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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