Do not disagree in principal, but the Type Tests and construction requirements of L/N/PE terminals vs L1/L2/N terminals can vary with the scoped product safety standards and building code.
Brian From: Nyffenegger, Dave [mailto:dave.nyffeneg...@bhemail.com] Sent: Tuesday, December 15, 2015 12:00 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Internal connection labels in 220VAC systems I've used a lot of small listed/certified DC power supplies that are wide-range voltage input but have the terminals marked L, N, PE. These could also be wired to L1 -L2 or L1-N in the US or L1-N in Europe. -Dave From: Richard Nute [mailto:ri...@ieee.org] Sent: Tuesday, December 15, 2015 2:43 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Internal connection labels in 220VAC systems Hi John: If you can, I would include both markings, 90-230 volts: L, N, PE; 220 volts: L1, L2, PE (North America). (I am assuming that the equipment ratings marked on the equipment are wide-range, e.g., 90-240 volts.) The NRTL should not object to a dual marking. Do I have an argument that the NRTL has made an incorrect assessment? No. By your own admission, the NRTL is correct. The NRTL is somewhat narrow-minded in not recognizing that the rest of the world is L, N, PE at 230 volts, and that your equipment model is for world-wide use, not just for North America. Today, lots of equipment is wide-range and for the world market. Having terminals requires the NRTL and you to re-visit what has been accepted using a power cord and appliance coupler. Good luck! Rich From: John Cochran [mailto:jcoch...@strongarm.com] Sent: Tuesday, December 15, 2015 10:38 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] Internal connection labels in 220VAC systems Recently a customer has corrected the markings of terminal blocks inside of an industrial control panel my company built. An NRTL has evaluated the system and says the terminal markings for Line (L), Neutral (N), and Ground (G) are incorrect for a 220VAC input condition. Their evaluation says that N is incorrect and should be labeled (L2) and the Line as (L1). I agree that this is technically corrected for a North American wired 220VAC input as it consists of 2 live wires, each 110VAC. For international use, 220VAC is only on one leg (L) and the return is (N). This system is capable of handling 90-240VAC single-phase input, but the customer has been instructed by the NRTL that for 110VAC input the terminals should be marked L/N/PE, and for 220VAC input the terminals should be marked L1/L2/PE. This would require different construction for North America and International use. Do I have an argument that the NRTL has made an incorrect assessment? Thanks, John Cochran Strongarm Energy Division STRONGARM Designs 423 Sargon Way, Horsham, PA 19044 Ph: 215-443-3400 x219 Fax: 215-443-3002 jcoch...@strongarm.com - ---------------------------------------------------------------- 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 <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>
