That's my understanding too. As I recall, the 125% rule was established long ago apparently to help avoid nuisance tripping of circuit breakers in panel boards. Run 100% of handle rating in CB on open bench and you may find it runs surprisingly hot. In a panel board, the increased ambient makes it trip early, I suppose. ____________________________________________________________________________
Ralph McDiarmid | Schneider Electric | Solar Business | CANADA | Regulatory Compliance Engineering From: Peter Tarver <ptar...@enphaseenergy.com> To: EMC-PSTC@LISTSERV.IEEE.ORG Date: 05/03/2012 02:13 PM Subject: Re: [PSES] Circuit breakers in Europe > From: Brian Oconnell [mailto:oconne...@tamuracorp.com] > Sent: Thursday, May 03, 2012 08:36 > > Not certain what OP is attempting, as wire gage is > dependent on the fault > calc found in electric code, and breaker rating is > related to the distribution. In North America, barring circumstances requiring deeper engineering calculations and supervision, a circuit sized for and protected by a 20 A breaker cannot carry long continuous currents larger than 16 A. My preexisting notion (for lack of better understanding) for Europe has been that a 16 A breaker is used to protect a 16 A circuit. (The "80% Rule" or a similar rule does not apply in Europe and overcurrent protection is generally matched to the circuit size.) I'm looking for either confirmation of or contradiction of that notion. So far, one vote received confirming. Regards, Peter L. Tarver This email message is for the sole use of the intended recipient(s) and may contain confidential and/or privileged information. If you are not an intended recipient, you may not review, use, copy, disclose or distribute this message. If you received this message in error, please contact the sender by reply email and destroy all copies of the original message. - ---------------------------------------------------------------- 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 <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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 <emcp...@radiusnorth.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com> ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. ______________________________________________________________________ - ---------------------------------------------------------------- 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 <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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 <emcp...@radiusnorth.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
