Hello Richard, Thank you for your reply.
Unit that we certify is composed of power supply, UPS, PC, some low voltage electronics and LCD monitor supplied by external AC/DC adapter. LCD monitor is not approved, but internal panel is UL approved. So if I understand you correctly, it is enough to explain the LCD in list of critical components in general way (manufacturer, model and ratings). It is not required to list internal components inside the monitor. Is my understanding correct? But what about follow-up service? Will NRTL lab consider it as a non-certified component and request annual follow-up testing on LCD? Best regards, Bostjan On 21. avg. 2013, at 19:50, "Richard Nute" <[email protected]<mailto:[email protected]>> wrote: Hello Bostjan: The certification of a component such as a video monitor cannot be used as a stand-alone certification; it can only be used to certify the component as part of another equipment. A certified component should be included in the list of critical components -- even though it is low voltage and non-critical. It is only necessary to identify it as a display, its manufacturer and model, power requirements, and who it is certified by; it is not necessary to include other data. Best regards, Richard On 8/13/2013 10:29 AM, Boštjan Glavič wrote: Hello Richard, Yes the unit is supplied by external power supply source with SELV, LPS output. The complete unit will be NRTL certified. My question is whether we need to consider complete monitor (it is for building-in, not consumer monitor) as critical component or I can leave it out of list of critical components)? In case we need to put it in list of critical components, can I describe it by internal parts/components (e.g. connector, panel, etc)? Manufacturer of final unit is buying the monitor and cannot apply for NRTL approval without cooperation of monitor manufacturer. Why do you find approval of the panel useless? Best regards, Bostjan From: Richard Nute [mailto:[email protected]] Sent: Tuesday, August 13, 2013 6:57 PM To: Boštjan Glavič Cc: [email protected]<mailto:[email protected]> Subject: Re: LED monitor Hello Bostjan: If the LED monitor runs on mains voltage, then it must be certified by an NRTL. If it runs on low voltage, it need not be certified by an NRTL. But, I would get it certified anyway as it is easy, not time consuming, and cheap. And, it avoids any problems. The UL-recognized LED panel is of no value unless you certify the whole display. Best regards, Rich On 8/12/2013 11:21 PM, Boštjan Glavič wrote: Dear Experts, We are just approving one product for US/CAN market that comprises LED monitor. Would you consider LED monitor as a critical component and ask for NRTL approval? There is no back-light inverter inside and therefore no hazardous voltages. LED display panel itself is UL approved. Is that enough? Best regards, Bostjan - ---------------------------------------------------------------- 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.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://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]>
