For this particular case, agreed. There are both legal (at least for this side of the cod pond) and engineering rationale differences for a false positive and a false negative; that is, if there is specific data indicating an operating condition not conformant with rating label where test data indicates unsafe or unreliable operating conditions, then supporting test data is indicated. It is almost never indicated for the opposite without additional risk.
For North America in general, and the USA in particular, operating conditions outside of the approved ratings and conditions of acceptability should not be considered in any customer discussions. Brian -----Original Message----- From: John Woodgate [mailto:jmw1...@btinternet.com] Sent: Monday, September 26, 2016 2:14 PM To: Brian O'Connell; EMC-PSTC@LISTSERV.IEEE.ORG Subject: RE: [PSES] Using 60hz motors in 50hz countries You can, and should, disclose test data that shows that it won't work. If your customer ignores that (and they sometimes do), it's not your responsibility. With best wishes DESIGN IT IN! OOO – Own Opinions Only www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England Sylvae in aeternum manent. -----Original Message----- From: Brian O'Connell [mailto:oconne...@tamuracorp.com] Sent: Monday, September 26, 2016 6:37 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Using 60hz motors in 50hz countries How components are used cannot be controlled by manufacturer, so your due diligence is to ship each unit with conditions of acceptability and install/operate instructions that are scoped per the standards that would apply to the component and to the end-use equipment. Carefully control what is on your website and what your sales peoples say to customer. If a buyer or designer asks you about a use not within the nameplate ratings or instructions, the legally correct response is the unit has been assessed for use at the following operating conditions... blah. There are other things that can be said or done, but your risk increases. Do not offer 'probably will' advice unless you have empirical test data supporting those operating conditions; and never admit that you have test data for operations outside of the unit's ratings. Brian -----Original Message----- From: Kunde, Brian [mailto:brian_ku...@lecotc.com] Sent: Monday, September 26, 2016 7:39 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] Using 60hz motors in 50hz countries Dear experts, Can AC brushless motors (in this case 230V~ 3-phase 3hp motors) that are rated "60HZ" be used in products going to countries that have 50HZ power? I believe the motors will run a little slower which will not affect the function of the product, but is there a safety issue with this? The motors are thermally, overload, and short circuit protected. They are "intermittent use" and not likely to overheat. As a rule, we only market and sell such products to countries with 60hz power. However, a North America company might purchase one and ship it to one of their international locations with 50hz power without our knowledge. Do we need to be concerned about this? Of course, this fact has our sales force wondering if it is OK to market and sell 60hz motor driven products in countries with 50hz. I really don't know. I cannot see a safety issue but one can say that the motor would be used in a way it is not intended to be used resulting in a higher risk if something did happening. Any opinions on this? Thanks, The Other Brian - ---------------------------------------------------------------- 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>
