Hello Chris, We are going through the same issue here at Bose...A while back we received a ruling that this type of design did meet the intent of the standard from TUV and UL. CSA was a little more stringent in their interpretation.
Based on my correspondence with CSA here is my take: 1. You do not need a switch if your product is switched off automatically either by a timer function or by an external signal provided your amp outputs are actually switched off and the product is not simply in standby mode. 2. Your product must not consume more then 15W when in the off mode (see the CSA excerpt below) under normal conditions and after a single fault condition. So if you use a single semiconductor to switch off your amp you would not meet the intent of the standard if your product draws more than 15W with the semiconductor shorted. This point is also clarified in the IEC60065 6th CENELEC OSM decisions from 7/2001 in sub-clause 14.6.2. Here is a short excerpt concerning IEC60065 sub-clause 14.6.2 I got from CSA on this issue: "Irrespective of their power consumption" means power consumption in the ON mode. If there is no manual OFF switch, it is permitted to have the product switched OFF automatically using a signal. "Mute" is not really OFF, but a STANDBY mode. The intent of the standard is reduce fire hazard by disconnecting the supply voltage from the circuitry in the OFF mode. "Mute" with Supply Voltage still connected to the output stage does not really satisfy this intent. Some other designs have used electronic switching of the MAINS or Secondary Supply to satisfy the OFF condition. Even if AUTOMATICALLY SWITCHED, the second paragraph of 14.6.2 applies to the OFF condition.(Less than 15W with single fault) Contact me if you want a copy of the OSM decisions. Please note that these decisions are only guidelines which were agreed upon by the various CENELC member Notified Bodies and do not legally change the Standard. I have no verification that these decisions would be accepted outside the EU, i.e. in Asia...etc... Also be aware that the published 7th edition of IEC60065 eliminates the need for a switch which is in line with the current edition of UL6500. Unfortunately it will probably be several years before all the countries adopt this edition of the standard.... Hope this helps as this is a tricky area to interpret.... regards, John Tyra Design Assurance Engineering, Product Safety & Regulatory Manager Bose Corporation The Mountain, M.S.-450 Framingham, MA 01701-9168 508-766-1502 Phone 508-766-1145 Fax john_t...@bose.com -----Original Message----- From: Colgan, Chris [mailto:chris.col...@tagmclaren.com] Sent: Wednesday, September 18, 2002 4:48 AM To: 'Emc-Pstc' (E-mail) Subject: EN60065 mains switches Hello I know that engineers familiar with EN60065 are rarer than hen's teeth but maybe someone out there can help me... Clause 14.6.2 allows for no mains switch to be fitted if the product can be switched on or off or both automatically. Do you think that an audio amplifier that utilises an input signal detect circuit to automatically switch on fulfils the requirements of this clause? Thanks for any input Chris Colgan Compliance Engineer TAG McLaren Audio Ltd The Summit, Latham Road Huntingdon, Cambs, PE29 6ZU *Tel: +44 (0)1480 415 627 *Fax: +44 (0)1480 52159 * Mailto:chris.col...@tagmclaren.com * http://www.tagmclaren.com ************************************************************** Please visit us at www.tagmclaren.com ************************************************************** The contents of this E-mail are confidential and for the exclusive use of the intended recipient. If you receive this E-mail in error, please delete it from your system immediately and notify us either by E-mail, telephone or fax. You should not copy, forward or otherwise disclose the content of the E-mail. Important Note: Any typographical, clerical or other error in this communication is subject to correction without any liability on the part of TAG McLaren Audio Limited. Any orders placed shall be subject to acceptance by TAG McLaren Audio Limited on its standard terms and conditions of sale which shall govern the contract for the sale and purchase of the products ordered to the exclusion of any other terms and conditions. TAG McLaren Audio Ltd The Summit, 11 Latham Road Huntingdon, Cambs, PE29 6ZU Telephone : 01480 415600 (+44 1480 415600) Facsimile : 01480 52159 (+44 1480 52159) ************************************************************** Please visit us at www.tagmclaren.com ************************************************************** ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list" ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
