Definetly use an approved PTC. The testing is long term and follow up services in proving the same PTC is used that was tested will get messy. You will likely also be required to do a temperature test with thermocouples on surfaces near the PTC. They do tend to get hot when performing their function.
John Allen Product Safety Consulting, Inc. 605 Country Club Dr. | Stes. I & J | Bensenville, IL 60106 630-238-0188 | 800-233-7738 | 630-238-0269 (f) [email protected] www.productsafetyinc.com Although PSC maintains the highest level of virus protection, this e-mail and any attachments should be scanned by your virus protection software. It is the responsibility of the recipient to check that it is virus free. PSC does not accept any responsibility for data loss or systems damage arising in any way from its use. This message is confidential and intended only for the individual to whom or entity to which it is addressed. If you are not the intended recipient or addressee, or an employee or agent responsible for delivering this message to the addressee, you are hereby notified that any dissemination, distribution, or copying, in whole or part, of this message is strictly prohibited. If you believe that you have been sent this message in error, please do not read it. Please immediately reply to sender that you have received this message in error. Then permanently delete all copies of the message. Thank you. From: Greg McClure [mailto:[email protected]] Sent: Wednesday, November 18, 2009 11:41 AM To: [email protected] Subject: Re: [PSES] PTC Test Requirements Brian, You can easily avoid being concerned with the details of the test. When you choose the PTC for your design, make sure you pick one that already has component recognition/approval to IEC 60730-1. You will find that many of them have UL and TUV component approval already. The PTC vendors typically show the test mark approvals on their data sheets. You then can request a copy of the certificate from the PTC manufacturer to verify that it is to the proper version and clause(s) of the standard. By using the recognized component, you avoid the component testing and conditioning required in 60730-1. You may still have to perform testing on the I/O pin to prove your design meets requirements at the connector but that is much easier than the component level test. Regards, Gregory H. McClure Lexmark Product Safety 859 232 3240 office 859 232 6882 fax Confidentiality Notice: This e-mail message, including any attachment, is for the sole use of the intended recipient(s) and may contain confidential information. Any unauthorized review, use, disclosure or distribution is strictly prohibited. If you are not the intended recipient, please contact the sender, by e-mail, and destroy all copies of the original message. "Kunde, Brian" <brian_kunde@LECO TC.COM> To Sent by: <[email protected]> [email protected] cc Subject 11/18/2009 11:36 PTC Test Requirements AM According to IEC/EN 60950 section 2.5b, a positive temperature coefficient device (PTC) can be used to limit current for a limited power source circuit. It says the PTC has to "pass the test specified in IEC 60730-1, clauses 15, 17, J.15 and J.17". I don't have this standard. Can someone outline the test requirements for me? I'm trying to avoid adding another standard to our library unless we really need to. Application: Sometimes we would like to supply 24Vdc to an I/O port to operate a device outside the fire enclosure. I assume a PTC or Pico Fuse can be used for this application. We drive the I/O circuit with a programmable High-Side Driver programmed to 4 amps max but someone suggested that we cannot rely on it for safety in this application. Any other suggestions? Thanks to all, The Other Brian _________________________ LECO Corporation Notice: This communication may contain confidential information intended for the named recipient(s) only. If you received this by mistake, please destroy it and notify us of the error. Thank you. - 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 < [email protected]> All emc-pstc postings are archived and searchable on the web at http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. 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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher <[email protected]> David Heald <[email protected]> - 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 <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. 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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]> - 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 <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. 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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
