Could well have been. But it was over 30 years ago in a facility that I would not have access to, even if it is still in existence. J
Ghery S. Pettit From: Derek Walton [mailto:lfresea...@aol.com] Sent: Monday, November 29, 2010 11:29 AM To: Pettit, Ghery; j...@jmwa.demon.co.uk; EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Shield bonding on STP Cat5 Ethernet cables I would think this indicated a fault condition, and needed fixing. It's not an operating condition. I wonder how the ELCB's cope with that? Cheers, Derek. -----Original Message----- From: Pettit, Ghery <ghery.pet...@intel.com> To: John Woodgate <j...@jmwa.demon.co.uk>; EMC-PSTC@LISTSERV.IEEE.ORG <EMC-PSTC@LISTSERV.IEEE.ORG> Sent: Mon, Nov 29, 2010 1:18 pm Subject: RE: [PSES] Shield bonding on STP Cat5 Ethernet cables I've seen 60V 60 Hz between two ground systems in the US. Drew a nice arc off the ground clip of a scope when it was plugged into an outlet on one ground system and tried to take a measurement on a device connected to the other. You really didn't want to touch both cabinets at the same time. Ghery S. Pettit -----Original Message----- From: emc-p...@ieee.org [mailto:emc-p...@ieee.org <mailto:emc-p...@ieee.org?> ] On Behalf Of John Woodgate Sent: Monday, November 29, 2010 11:09 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Shield bonding on STP Cat5 Ethernet cables In message <8cd5e0cbb14a33c-c3c-...@webmail-m092.sysops.aol.com>, dated Mon, 29 Nov 2010, Derek Walton <lfresea...@aol.com> writes: >Agreed John, it CAN... but not under normal conditions. Quite honestly, >under fault conditions if that situation arises I'd be looking for >other more serious problems if the shield carried that much current. It DOES happen in Europe under normal conditions. I have measured 9 V 50 Hz between two 'earths' (British English since this is about Europe!). Connect a 1 ohm screen between them and you get.... This was in an old building, but everything appeared to be working until... -- 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 If at first you don't succeed, delegate. But I support unbloated email http://www.asciiribbon.org/ - ---------------------------------------------------------------- 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://product-compliance.oc.ieee.org/ 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 <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 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://product-compliance.oc.ieee.org/ 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 <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 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://product-compliance.oc.ieee.org/ 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 <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>
