The UL standard for supplementary overcurrent protectors is UL 1077. UL does not have any products Listed to that standard and UL will not List products to that standard. UL only has Recognized products under UL 1077. You can find products under category code QVNU2, but there is nothing under QVNU.
There are a number of different categories of products that UL certifies under UL 489. In general, those that are Listed are suitable for branch circuit protection and those that are Recognized might be if the Conditions of Acceptability are met. However, if an overcurrent protection device is Listed, it has been tested to UL 489, the circuit breaker standards and not UL 1077, the supplementary overcurrent standard. For more information, see the Marking and Application Guide<http://www.ul.com/global/documents/offerings/perspectives/regulators/electrical/newsletters/MoldedCaseCircuitBreakersMG.pdf>. Ted Eckert Compliance Engineer Microsoft Corporation ted.eck...@microsoft.com<mailto:ted.eck...@microsoft.com> The opinions expressed are my own and do not necessarily reflect those of my employer. From: jral...@productsafetyinc.com [mailto:jral...@productsafetyinc.com] Sent: Tuesday, December 3, 2013 12:29 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Circuit Breakers - Branch Circuit Protection vs Supplementary So there are no UL Listed breakers that are only good for supplementary protection?? On Dec 3, 2013, at 2:26 PM, "Jim Morrison" <jmorri...@qps.ca<mailto:jmorri...@qps.ca>> wrote: Hi John: If the device has a UL - <image001.png>, this would indicate approval to UL489 & suitable for a branch circuit device. If only marked - <image002.gif>, the device would be approved to UL1077 and only recognized as a supplementary protector & not suitable for a branch circuit. Regards Jim Morrison C.E.T. C.E.I. Chief of Engineering / Vice President – Field Evaluations/Engineering | QPS Evaluation Services Inc. | 81 Kelfield Street, Unit 8, Toronto, Ontario, M9W 5A3 – OSHA Recognized NRTL Office (416-241-8857) | Cell ( 416-318-9104) | Fax (416-241-0682) | Toll Free ( 1-877-746-4777) | Website: www.qps.ca<http://www.qps.ca/> ; email jmorri...@qps.ca<mailto:jmorri...@qps.ca> <image003.jpg> -----Original Message----- From: Brian Oconnell [mailto:oconne...@tamuracorp.com] Sent: December-03-13 1:38 PM To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Subject: Re: [PSES] Circuit Breakers - Branch Circuit Protection vs Supplementary 1. UL 'White' book 2. UL marking guide for CBs 3. The particular standard used (489/1077/508x) 4. iaei.org<http://iaei.org> 5. mfr spec sheet 6. Vulcan mind-meld Brian From: jral...@productsafetyinc.com<mailto:jral...@productsafetyinc.com> [mailto:jral...@productsafetyinc.com] Sent: Tuesday, December 03, 2013 10:13 AM To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Subject: [PSES] Circuit Breakers - Branch Circuit Protection vs Supplementary Hi, Is there a way to confirm if a CB is good for Branch Circuit Protection vs Supplementary by the markings on the device? Basically I want to be able to confirm in the field. I reviewed UL's guide cards for both (Branch Circuit - DIVQ and Supplementary - QVNU2). There are markings for DIVQ, but none stated for QVNU2. The Listing mark vs Recognition mark would be the obvious one, but I'm told you can have Listed CB's that are not good for Branch Circuit Protection. I greatly appreciate the input. Thank you, 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 <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>
