That's my feeling - it's an illogical exclusion. At most the standard should disallow the use of any (ie technology neutral) device that has not been tested to a relevant standard that takes cycle life into account, but to pick on auto-reset electromechanical devices while allowing auto-reset solid state devices seems very odd, especially since the latter are more likely to be damaged by surges and the like.
Any '950 authors lurking who haven't commented yet? Jim Eichner, P.Eng. Compliance Engineering Manager Xantrex Technology Inc. e-mail: jim.eich...@xantrex.com web: www.xantrex.com Confidentiality Notice: This email message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of John Woodgate Sent: Friday, June 20, 2008 5:15 AM To: emc-p...@ieee.org Subject: Re: FW: 60950-1:2006 clause 2.5 - Limited power sources In message <de87437fe365cb458c265ea3d73b6f1d039ad...@xbc-mail1.xantrex.com>, dated Fri, 20 Jun 2008, Jim Eichner <jim.eich...@xantrex.com> writes: >To be clear, the LPS application would not be a "circuit breaker" as >the term is commonly used. The language from '950 that I objected to >was regarding automatically resetting overcurrent protective devices, >so rather than a circuit breaker it would be something like a thermal >auto-reset device that I would call a "current limiter" or a "circuit >protector" not a breaker. Semantics to some extent, but auto-reset was >the main attribute for this discussion. Well, if it's not a circuit-breaker (electromechanical, and therefore reliability is an issue), it makes even less sense to allow PTCs. I suspect that the ban on auto-reset was lifted for PTCs because if not it would be an absolute ban on their use. But it's not logical. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Either we are causing global warming, in which case we may be able to stop it, or natural variation is causing it, and we probably can't stop it. You choose! John Woodgate, J M Woodgate and Associates, Rayleigh, Essex 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 emc-p...@ieee.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 emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com 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 emc-p...@ieee.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 emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc