John, Thank you for your reply and advice.
I did indeed raise the issue about potential for flicker induced health issues with the client. Best regards, Kevin Richardson Stanimore Pty Limited Compliance Advice & Solutions for Technology (Legislation/Regulations/Standards/Australian Agent Services) Ph: 02-4329-4070 (Int'l: +61-2-4329-4070) Fax: 02-4328-5639 (Int'l: +61-2-4328-5639) Mobile: 04-1224-1620 (Int'l: +61-4-1224-1620) Email: kevin.richard...@stanimore.com or kevin.richard...@ieee.org URL: www.stanimore.com Confidentiality This material (this email including all attachments) may contain confidential and/or privileged information intended to be read or used by the addressees only. If you are not one of the intended recipients, any copying, disclosure, distribution, use of or reliance upon this material is prohibited. If you receive this material in error, please immediately notify Stanimore Pty Limited and delete/destroy all copies (electronic and hardcopy) of this email and all attachments. While the sender tries to ensure the accuracy of the information contained in this material, Stanimore take no responsibility for any actions taken as a result of receiving this material or for any consequence of its use. From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of John Woodgate Sent: Monday, 24 November 2008 7:26 PM To: emc-p...@ieee.org Subject: Re: Flicker Requirements of 61000-3-3 In message <nebbihdflagbliikmlbkmeddjhaa.kevin.richard...@ieee.org>, dated Mon, 24 Nov 2008, Kevin Richardson <kevin.richard...@ieee.org> writes: >I have a client who has a 4 channel, professional lighting dimmer >device, designed to be used for small stage productions (schools etc). >The device is failing 61000-3-3 flicker requirements. This device is >designed to switch the lighting outputs on and off at high rates - >potentially 7 times per second, and the result naturally is a poor >result in the flicker tests. The user is in direct control of the >switching rate and therefore the potential resulting "flicker" detected >on the mains. I am surprised that such a facility is offered, due to the risk of inducing seizure in persons with photo-triggered epilepsy. This would be particularly unwise in a product for use in schools. For example, a student might not have previously been diagnosed with the condition. > >As I understand it, 61000-3-11 also includes requirements for >"conditional connection" devices and that devices that can not comply >with 61000-3-3 can be covered under 61000-3-11 as a "conditional >connection" device. > >My questions: >* Am I correct in assuming that this device would need to comply >with >the "conditional connection" requirements of 61000-3-11? Yes. >* Can anyone give me a rough idea of the "conditional connection" >restrictions/requirements? A rough idea, yes, but you need to read the standard. You have to specify the maximum supply impedance that allows the flicker requirements to be met. This is bound to be lower than the 'standard' impedance specified in IEC/EN 61000-3-3. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Either we are causing global warming, in which case we may be able to stop it, or natural variation is causing it, and we probably can't stop it. You choose! John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - 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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. 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 <emcp...@ptcnh.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. 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 <emcp...@ptcnh.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
