This is great information, thank you Scott. And thanks to everyone else who guided an old school compliance guy - We’re always learning!!
Be safe out there, John From: Scott Aldous <scottald...@google.com> Sent: Tuesday, May 12, 2020 10:47 AM To: John Allen <jral...@productsafetyinc.com> Cc: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] UL Listed Fuse vs Recognized There is some additional information in this article<https://japan.ul.com/wp-content/uploads/2014/04/ul_OvercurrentProtectionSupplementary.pdf> from UL. It makes the important point that unlike circuit breakers, supplemental fuses can be either Listed or Recognized. Important to note that the JDYX category from UL is a category specifically for supplemental fuses that are Listed, with JDYX2 the category for Recognized supplemental fuses (to US standards). Supplemental fuses are evaluated to UL 248-14 (in conjunction with UL 248-1) for either Listing or Recognition, with branch-circuit protection fuses listed to other parts of the UL 248 series depending on the fuse type (see UL categories JDDZ, JDRX, and JEFV). Supplemental fuses are generally not physically able to fit into fuse holders for branch-circuit protection fuse types. Comparing the UL guide information for JDYX vs JDYX2 reveals that the information between the two is very similar, with JDYX having information about product markings and identity that JDYX2 does not, and JDYX2 having caveats about the device being only acceptable in the final equipment installation and conditions of acceptability that JDYX does not. The UL article linked to above and the excellent fuseology reference from Eaton Bussmann<https://www.eaton.com/content/dam/eaton/markets/machinebuilding/protect-personnel-assets-and-machine-reliability/documents/documents-english-language/bus-ele-br-10757-fuseology.pdf> on page 35 point out that there are some exceptions where the NEC allows supplemental fuses to be installed in installations rather than just inside equipment, with some examples from the Eaton/Bussmann catalog on subsequent pages of fuses that could be used for those purposes, all of which are Listed. I assume that any fuse used in a permanent installation would need to be Listed rather than Recognized. On Tue, May 12, 2020 at 5:31 AM John Allen <jral...@productsafetyinc.com<mailto:jral...@productsafetyinc.com>> wrote: Thanks Ted, very helpful!! Be Safe, John From: Ted Eckert <000007cf6ebeab9d-dmarc-requ...@listserv.ieee.org<mailto:000007cf6ebeab9d-dmarc-requ...@listserv.ieee.org>> Sent: Monday, May 11, 2020 3:07 PM To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Subject: Re: [PSES] UL Listed Fuse vs Recognized I forgot to add a link. There is a little more information here. https://code-authorities.ul.com/wp-content/uploads/2014/09/CircuitBreaker_MG.pdf From: Ted Eckert <000007cf6ebeab9d-dmarc-requ...@listserv.ieee.org<mailto:000007cf6ebeab9d-dmarc-requ...@listserv.ieee.org>> Sent: Monday, May 11, 2020 1:04 PM To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Subject: [EXTERNAL] Re: [PSES] UL Listed Fuse vs Recognized Hello John, Others can probably provide a better answer than I can, but I’ll make an attempt. Fuses and circuit breakers are extremely safety-critical. The Listed overcurrent protectors are typically for building power distribution. Long ago, replacing blown fuses was a common task for a homeowner. The fuses had to be designed to a higher level of safety because the installation was somewhat uncontrolled. The Listed versions are tested to a level where it acceptable for handling by general users rather than by instructed or trained personnel. The Listed overcurrent protectors should fail gracefully with high currents from ground faults. Recognized overcurrent protectors are generally not acceptable for branch circuit protection where they could be reset or replaced by a general uses. UL has different standards for Molded Case Circuit Breakers and Supplementary Overcurrent Protectors, with the latter often being the Recognized components. As the standard name implies, they supplement the branch circuit protection and do not replace it. Recognized fuses may often ben internal to a device where they are within a fire enclosure and only accessible to service personnel. This is a bit of an oversimplification, but I hope it helps clear it up a little. Regards, Ted Eckert The opinions expressed do not necessarily reflect those of my employer or UL. From: John Allen <jral...@productsafetyinc.com<mailto:jral...@productsafetyinc.com>> Sent: Monday, May 11, 2020 11:19 AM To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Subject: [EXTERNAL] [PSES] UL Listed Fuse vs Recognized Hi, I hope everyone is good, healthy and being safe. Does anyone have an accurate explanation of how a fuse can be UL Listed vs UR? A fuse cannot stand alone as with other UL Listed products. UL categories are JDYX, JDYX2 Thank you and Be Safe, John - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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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://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
