If the circuit is supplied by an energy limited circuit, then the polymeric materials do not need to be flame rated per clause 9.2 and Figure 11. The flame rating is only required if a source of ignition exists, thus if the risk of ignition is effectively removed, then there is no need of a fire enclosure. The circuit which limits the energy may still require flame rated materials because it is not supplied by limited energy - it is only the output which is limited.
Regards Tom Smith, P.Eng Principal Engineer TJS Technical Services Inc. Tel: +1 403-612-6664 Email: <mailto:[email protected]> [email protected] <http://tjstechnical.com/> http://tjstechnical.com Compliance News Updates: <https://corp.social/@TJS_Technical> https://corp.social/@TJS_Technical From: John Allen <[email protected]> Sent: November 22, 2024 7:35 AM To: [email protected] Subject: [PSES] Calling all UL 61010 experts Hello everyone, I'm trying to determine if a flame rating is required for polymeric materials in a Limited Energy circuit. Per Clause 9 - 1 - Test to prove no ignition can occur (9.1). If ignition occurs, see item 3 below. 2 - Eliminate or reduce the source (9.2). 3 - Contain the fire with appropriate materials (9.3). * Metal * Polymeric V-1 minimum per 9.3.2c)2. I find it interesting when searching for "propagate" it only refers to insulated wire and cables shall retard propagation (9.3.2b)). I believe propagation of flame should also be a requirement of polymeric materials near ignition sources. All that said, although we can argue items 1 and 2 above do not need a flame rated enclosure, I feel 94HB should be the minimum and guessing a NRTL/Certification Body would feel the same. Thoughts?? Best Regards and Be Safe, John John Allen | President & CEO | Product Safety Consulting, Inc. Your Outsourced Compliance DepartmentR 630-238-0188, Cell: 630-330-3145 <http://www.facebook.com/pages/Product-Safety-Consulting-Inc/97306850917> <http://twitter.com/SafetyTesting> <http://www.linkedin.com/in/productsafetyconsultinginc> <https://www.youtube.com/channel/UCVSzENmSoWeNFSBQcOYN7-A> https://www.youtube.com/channel/UCVSzENmSoWeNFSBQcOYN7-A <http://www.productsafetyinc.com/> www.productsafetyinc.com IEEE Product Safety Engineering Society President 2024-2025 Compliance 101 Technical Committee Chairman IEEE Senior Member Keeping our members informed and educated on Product Safety and Certifications <https://ewh.ieee.org/soc/pses/index.html> https://ewh.ieee.org/soc/pses/index.html 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 _____ 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] <mailto:[email protected]> All emc-pstc postings are archived and searchable on the web at: <https://www.mail-archive.com/[email protected]/%20> https://www.mail-archive.com/[email protected]/ Website: https://ewh.ieee.org/soc/pses/ <https://ewh.ieee.org/soc/pses/> Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe) <https://ewh.ieee.org/soc/pses/list.html> List rules: https://ewh.ieee.org/soc/pses/listrules.html For help, send mail to the list administrators: Mike Sherman at: [email protected] <mailto:[email protected]> Rick Linford at: [email protected] <mailto:[email protected]> For policy questions, send mail to: Jim Bacher at: [email protected] <mailto:[email protected]> _____ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC <https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1> &A=1 -- This email has been checked for viruses by Avast antivirus software. www.avast.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 [email protected] All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/[email protected]/ Website: https://ewh.ieee.org/soc/pses/ Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe) List rules: https://ewh.ieee.org/soc/pses/listrules.html For help, send mail to the list administrators: Mike Sherman at: [email protected] Rick Linford at: [email protected] For policy questions, send mail to: Jim Bacher: <[email protected]> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
