Hi Folks I agree strongly with Oscar's comments and previous approach - "Compliance critical" is a far better term. It also means that you can have "EN60950 compliance critical", " EMC compliance critical" etc, as you like without confusion.
However the widespread existing use of "safety critical component" among the test and certification authorities, will still result in confusion for a long time - maybe we need an education programme for everybody? How about it: UL/VDE/BSI/etc., etc? Regards John Allen Thales Defence Communications Division Bracknell, UK -----Original Message----- From: oover...@lexmark.com [mailto:oover...@lexmark.com] Sent: 31 October 2001 12:43 To: emc-p...@majordomo.ieee.org Subject: RE: Definition for Safety Critical Component Gregg brings up a good point. I haven't followed all of this thread and I hope I'm not repeating someone else; but, just in case: Some of the things necessary to comply with the standards have less to do with safety than they do with compliance to the standard. Or in some cases the safety implications are less obvious. At a previous place of employment, in these cases we called them Compliance Critical Components. Unfortunately this was often easier to get through the management gauntlet that a Safety Critical Component. If management could not see the safety implications (or didn't buy into the rationale) they would not buy into the term "Safety Critical". When we told them that third party approval would not be obtained unless this requirement was met, they basically had to acquiesce and accept it. It was from this understanding that we coined the term "Compliance Critical Component" It was a cop-out but it got the job done. You just have to be careful and not overuse the term. Oscar Please note that this case in not representative of my current employer/management. These opinions are mine and are in no way to be construed to represent those of my employer. "Gregg Kervill" <gkervill%eu-link....@interlock.lexmark.com> on 10/30/2001 11:25:48 PM Please respond to "Gregg Kervill" <gkervill%eu-link....@interlock.lexmark.com> To: "'Doug McKean'" <dmckean%corp.auspex....@interlock.lexmark.com>, emc-pstc%majordomo.ieee....@interlock.lexmark.com cc: (bcc: Oscar Overton/Lex/Lexmark) Subject: RE: Definition for Safety Critical Component Sorry the change to HTML was necessary to format the table. Critical Components will including Paint (colour of the product), Labels and Instructions. There can be no definitive answer - hazards are in the eye of the beholder. The following is a good starting point - use the similarity rule to identify pneumatic and other products that store or control energy - electrical connectors - securing clips for hoses.... REMEMBER that safety devices that OPEN pneumatic pressure can create worse hazards that they prevent. G IEC or European Component Standard UL94 Flammability Standard Component Possible Operator-Service warning 94-V2 Air Filter Y Mains Capacitors Stored Charge Y CRT's Stored Charge Y Circuit Breakers Y Conductive Coatings Y Connectors Y Transformers and PSU Y UL Recognised Fans above 30 V UL Recognised low power fans 94 VW1 Fibre optic cable Eye Damage Y Fuses and Fuse holders Replacement Y Safety Switches Y Line filters Lithium Batteries Replacement - disposal instructions Y Mains connectors UL94-various ALL Plastic Parts Y Power cords and Mains Cables Y Mains voltage motors UL94-V1 Printed Circuit boards Y Relays in safety applications or switching hazardous voltages Y Products using primary power Y Switches in safety applications or switching hazardous voltages Isolate before removing cover Y Transient voltage surge suppressers Y Thermal controls Min - Maximum Y External cables UL94-VW1 Internal equipment wiring Eurolink Ltd. -One Link-199 Countries P.O. Box 310 Reedville, Virginia 22539 Phone: (804) 453-3141 Fax: (804) 453-9039 Web: www.eu-link.com -----Original Message----- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Doug McKean Sent: Tuesday, October 30, 2001 6:43 PM To: emc-p...@majordomo.ieee.org Subject: Re: Definition for Safety Critical Component Definition for Safety Critical ComponentI'll add to Richard's definition by saying a "Safety Critical Component" is a component necessary for the safety approval of the product. It's a component that prevents a person (end user or service person) from being exposed to a hazardous condition either during normal operation or from a fault. - Doug McKean ------------------------------------------- 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: Michael Garretson: pstc_ad...@garretson.org Dave Heald davehe...@mediaone.net 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: No longer online until our new server is brought online and the old messages are imported into the new server. ------------------------------------------- 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: Michael Garretson: pstc_ad...@garretson.org Dave Heald davehe...@mediaone.net 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: No longer online until our new server is brought online and the old messages are imported into the new server.
