John -- My recollection from working with one NRTL was that they wanted all nonenclosure polymerics on equipment to be HB minimum, even though I could not find this requirement in the related standard. Stated reason, as I recall, was to not provide any additional fuel for a fire, even an external fire. I also had a similar experience as Jim Bacher reports, where different shrinkage rates meant a new injection mold if changing from an HB to a V-rated material. Mike Sherman Sherman PSC LLC
> On 11/22/2024 8:35 AM CST John Allen <[email protected]> wrote: > > > > 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 Department® > > 630-238-0188, Cell: 630-330-3145 > > [social_facebook_box_blue for signature] > http://www.facebook.com/pages/Product-Safety-Consulting-Inc/97306850917[social_twitter_box_blue > for signature] http://twitter.com/SafetyTesting[social_linkedin_box_blue for > signature] http://www.linkedin.com/in/productsafetyconsultinginc > https://www.youtube.com/channel/UCVSzENmSoWeNFSBQcOYN7-A > https://www.youtube.com/channel/UCVSzENmSoWeNFSBQcOYN7-A > www.productsafetyinc.com http://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] > > 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/ 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&A=1 > - ---------------------------------------------------------------- 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
