Since LPS used, and if power source approved per UL1310 and CSA No.223, the AHJ's only NEC construction concern is article 725, which may or may not be scoped for intended end-use equipment.
In IEC terms, this could be considered Class III equipment, and the NRTL/SCC report would mostly emphasize the power source if there are no other external connections or internal hazardous voltages. So safety compliance would be a minor issue, and there would be much latitude of the materials 'downstream' from a Class 2/LPS power source. Regardless of low voltage or power levels, ITE and lab instrument safety standards have additional material requirements for some intended end-use operating conditions. The more difficult case would then be the EMC report, where you must specify all equipment combinations, so there is less 'choice' of materials. The standards giveth and taketh away. Brian From: [email protected] [mailto:[email protected]] On Behalf Of Boštjan Glavic Sent: Tuesday, August 13, 2013 10:30 AM To: [email protected] Cc: [email protected] Subject: RE: LED monitor 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] 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]>
