Steve, It appears to me that all pole switch is intended to be applied to isolating switch only. If a product has mains plug and a single pole switch, which device will you considered as isolation of supply in your opinion? Will you consider both are isolating device? Thus all pole switch must be used.
Thanks, Scott From: [email protected] [mailto:[email protected]] On Behalf Of Steve Richardson, Blackwood Labs Sent: Friday, September 14, 2007 7:56 PM To: [email protected] Subject: RE: I O power switch Scott, In the case of EN 60335 then the off position should be represented by the figure 0 (if figures are used) and any other position represented by a higher figure (usually |) regardless of how many poles it disconnects. Ref clause 7.10. If the switch needs to be a double pole disconnection device (ie for a stationary device with no other means of supply disconnection) then that is a separate issue but there is no differentiation when it comes to marking the on, off positions. In fact the note of clause 3.8.2 states that 'the off position does not imply all pole disconnection'. Regards, ___________________________________________ Steve Richardson Blackwood Compliance Laboratories From: [email protected] [mailto:[email protected]] On Behalf Of Barker, Neil Sent: 14 September 2007 12:25 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 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 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 ______________________________________________________________________
