In message <[email protected]>, dated Fri, 6 Nov 2009, Brian O'Connell <[email protected]> writes:
>First quote: >"(11) In order to prevent unnecessary losses of energy, products should >ideally enter into a "0-Watt" consumption state when providing no >function. The technical feasibility and appropriateness should be >considered on a product-by-product basis in the relevant implementing >measure pursuant to Directive 2005/32/EC." > >So I make the inference is that the device has a mechanical disconnect >that opens the connection from mains to interrupt all ac current flow >to the device. No, the quotes around "0 watt" are 'crossed fingers' meaning that it isn't necessarily quite zero, as we find out in later text. > >Second quote: >'''6. "off mode" means a condition in which the equipment is connected >to the mains power source and is not providing any function; the >following shall also be considered as off mode: >(a) conditions providing only an indication of off-mode condition; >(b) conditions providing only functionalities intended to ensure >electromagnetic compatibility pursuant to Directive 2004/108/EC of the >European Parliament and of the Council [2];''' > >So I then make the the assumption that current flow from mains is not >interrupted for 'off' mode; and that this 'off' mode is a lower power >consumption mode than 'standby'. Yes: this is because an EMC filter may be upstream of the mechanical switch, and it also allows a very low-power illumination of an 'OFF' indicator. > >Third quote: >"Off mode : 0 W-0,3 W with hard-off switch on the primary side, >depending, inter alia, on the characteristics related to >electromagnetic compatibility pursuant to Directive 2004/108/EC." > >Finally, I note that the 'off' mode does, in fact, require a mechanical >disconnect from mains. And note the 'inter alia' - so this means that I >get to make this up as I go ? It isn't wise to use Latin these days. 'Inter alia' means 'among other things', and one of those 'other things' (i.e. apart from any EMC filter upstream of the mains switch) is the low-power illumination I mentioned above. > >Oh, do not forget the section that says that there can be yet another, >non-named mode, when standby or off is not appropiate - left as an >excercise for the reader to find... This refers to stuff that has to be on all the time to perform its function, such as a clock or an antenna amplifier. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK Help stamp out intolerance! - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ 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]>
