I had an application where the tab used for bonding the sheet metal cover was spot welded to the cover. Inside were conductors protected at 125A. I was wondering how many spot welds might be needed to ensure that a ground fault wouldn't simply blow the spots off before tripping the breaker.
-Dave -----Original Message----- From: John Woodgate [mailto:j...@jmwa.demon.co.uk] Sent: Monday, March 02, 2015 2:33 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Serrated head screws for grounding/bonding In message <001401d0546c$35404530$9fc0cf90$@ieee.org>, dated Sun, 1 Mar 2015, Richard Nute <ri...@ieee.org> writes: >OTOH, there is still that possibility of a heavy fault current blasting >away tiny point-contact conduction paths. I wonder whether that actually happens. It seems to me that the points might, instead, melt and weld to the substrate. That's how spot-welding works. An experiment or three is indicated. -- OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk When I turn my back on the sun, it's to look for a rainbow John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - ---------------------------------------------------------------- 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://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com> - ---------------------------------------------------------------- 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://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
