Re: [PSES] Hipot with in-circuit voltage limiting devices IEC 61010-1 3rd Ed.
Richard, To be clear, what problem and subject correctly are you referring to? The IEC 61010-1 3rd Ed problem is specifying a test voltage of 0.9xclamping voltage. From memory Edition 1 of IEC 62368-1 never specified a test voltage of this level. Yes IEC 62368-1 had a twice AC mains safety test, which links with the twice AC mains test level of IEC 61010-1 3rd Ed. If IEC 62368-1 doesn't have a test level of 0.9xclamping voltage, then, yes, it doesn't have that problem. What is the subject correctly you are referring to; Varistors, safety testing or hipot testing? Best Regards Mick Would you like to check the latest draft of IEC 62368-1 to see if it treats the subject correctly? With respect to this problem, yes, IEC 62368-1 treats the subject correctly. Best regards, Richard Nute - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to emc-p...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@radiusnorth.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com
Re: [PSES] Hipot with in-circuit voltage limiting devices IEC 61010-1 3rd Ed.
In message 018DCF4B527741149F102EFC42E21D42@RichardHPdv6, dated Fri, 11 May 2012, Richard Nute ri...@bendbroadband.com writes: Would you like to check the latest draft of IEC 62368-1 to see if it treats the subject correctly? With respect to this problem, yes, IEC 62368-1 treats the subject correctly. So it could be used as evidence to persuade TC66 to reconsider. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Instead of saying that the government is doing too little, too late or too much, too early, say they've got is exactly right, thus throwing them into total confusion. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to emc-p...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@radiusnorth.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com
Re: [PSES] Hipot with in-circuit voltage limiting devices IEC 61010-1 3rd Ed.
Hi Mick: The problem is the one originally described. The 2nd Edition of IEC 62368-1 is the result of an ad hoc group that studied the various varistor components to arrive at a set of requirements that would allow the varistor (and its derivations) to perform the intended clamping yet not incur a safety issue. The big deal here is the issue of the energy the varistor must dissipate, which can cause catastrophic failure of the varistor, often resulting in a fire. The ad hoc group concentrated on requirements that would prevent device failure. IEC 62368-1 2nd references IEC 61051 for most requirements. I'm sure the varistor requirements will be again reviewed at the upcoming TC108 meeting in June in Northbrook, Illinois, U.S.A. If you or anyone on this list would like to review and comment on the 2nd Edition requirements, send me an e-mail and I'll send you the draft 2nd Edition along with a comment form, and who to send it to. Best regards, Rich -Original Message- From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Michael Maytum Sent: Saturday, May 12, 2012 12:01 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Cc: Michael Maytum Subject: Re: [PSES] Hipot with in-circuit voltage limiting devices IEC 61010-1 3rd Ed. Richard, To be clear, what problem and subject correctly are you referring to? The IEC 61010-1 3rd Ed problem is specifying a test voltage of 0.9xclamping voltage. From memory Edition 1 of IEC 62368-1 never specified a test voltage of this level. Yes IEC 62368-1 had a twice AC mains safety test, which links with the twice AC mains test level of IEC 61010-1 3rd Ed. If IEC 62368-1 doesn't have a test level of 0.9xclamping voltage, then, yes, it doesn't have that problem. What is the subject correctly you are referring to; Varistors, safety testing or hipot testing? Best Regards Mick Would you like to check the latest draft of IEC 62368-1 to see if it treats the subject correctly? With respect to this problem, yes, IEC 62368-1 treats the subject correctly. Best regards, Richard Nute - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to emc-p...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@radiusnorth.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to emc-p...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@radiusnorth.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com
Re: [PSES] Hipot with in-circuit voltage limiting devices IEC 61010-1 3rd Ed.
Hello John: With respect to this problem, yes, IEC 62368-1 treats the subject correctly. So it could be used as evidence to persuade TC66 to reconsider. Yes. The 2nd Edition of IEC 62368-1 refers to IEC 61051. TC66 should first identify the safety issue associated with varistors (fire) and the causes of varistor conflagration. Then, TC66 should apply those requirements from IEC 61051 that are likely to prevent conflagration as well as prevent spread of fire in the event of conflagration of the varistor. Best regards, Richard Nute Product Safety Consultant Bend, Oregon, U.S.A. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to emc-p...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@radiusnorth.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: dhe...@gmail.com
