Dear All, I have three questions regarding the calculation of clearances in accordance with the requirements of EN 61010-1. Can anybody out there help please?
Case 1 - Mains input transformer (230 Vac rms, Over-voltage category 2) supplies an ac to dc converter providing +15 Vdc output (not energy limited). To generate an energy limited supply, an appropriately approved PCB (Pollution degree 1, CTA> 175) mounted current limiting device is fitted in series with the dc supply. How do I determine the clearances around the unlimited +15 Vdc supply and the current limiting device? Which of the tables included in EN 61010-1 are appropriate and why? Case 2 - PCB mounted mains transformer (230 Vac rms, Over voltage category 2) is protected by an appropriately approved PCB mounted current limiting device in series with the secondary windings. How do I determine the clearance distances around the tracks from the secondary winding up to the current limiting device? Which of the tables included in EN 61010-1 are appropriate and why? Case 3 - I am looking at designing a push-pull inverter powered by a 5 Vdc supply derived from a mains transformer. What are the EN 61010-1 rules governing the clearances around the outputs from this inverter and the separation of the 5 V dc input and ac output circuits? Many thanks in anticipation of your help. Ian Unwin Servomex Group Limited, Jarvis Brook, Crowborough, East Sussex, TN6 3DU, England. e-mail: [email protected] Company Registered in England: No.2170458 VAT No.: GB 522 6077 63 Register now at http://www.servomex.com/zap.html for an opportunity to win a great prize in our quarterly draw. This email has been scanned for all viruses by the MessageLabs and contains information from Servomex which may be privileged or confidential. The information is intended to be for the use of the individual(s) or entity named above. If you are not the intended recipient be aware that any disclosure, copying, distribution or use of the contents of this information is prohibited. If you have received this electronic message in error, please notify us immediately. Servomex may, as part of its normal activities, monitor, edit or censor the content of any information and software, transmitted through, or stored on, its facilities. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] 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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
