Neil, The interpretation query came from EN 60065. Since the switch is an addition to the mains plug to isolate the power supply, the designer employs a single pole switch. If we use O, it seems to violate the requirement but it is permitted if the switch is not considered as isolating switch. I am looking other view on this scenario.
Thanks, Scott From: Barker, Neil [mailto:[email protected]] Sent: Friday, September 14, 2007 7:25 PM To: 'Scott Xe'; [email protected] Subject: RE: I O power switch Scott, I believe this to be incorrect. EN60950-1:2006 states, in Clause 1.7.8.3, Where symbols are used on or near controls to indicate ON and OFF conditions, they shall be the line | for ON and circle O for OFF. It is permitted to use the symbols O and | to indicate the OFF and ON positions of any primary or secondary power switches, including isolating switches. Nowhere does it state that these have to be two-pole switches, but if they are isolating switches, then they should be two-pole switches. Best regards Neil R. Barker CEng MIET HonFSEE MIEEE Manager Quality Engineering e2v technologies (uk) ltd 106 Waterhouse Lane Chelmsford Essex CM1 2QU UK Tel: (+44) 1245 453616 Fax: (+44) 1245 453571 Mob: (+44) 7801 723735 P Please consider the environment before printing this email. From: Scott Xe [mailto:[email protected]] Sent: 14 September 2007 12:05 To: [email protected] Subject: I O power switch I have learnt that a single pole power switch is not allowed to be marked with | for On function and O for Off function and only double pole switch can be used such symbol to distinguish the type of switch. If a single pole power switch is used, what is appropriate marking for it. Is there any standard to set this rule? Thanks and regards, Scott Sent by E2V TECHNOLOGIES PLC or a member of the E2V group of companies. A company registered in England and Wales. Company number: 04439718. Registered address: 106 Waterhouse Lane, Chelmsford, Essex, CM1 2QU, UK. - 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 ______________________________________________________________________
