> -----Original Message----- > From: 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.... Well John, I don’t think we can guess about the current level, because it all depends on the source impedance driving that 9-Volt differential. True, I would assume the worst, and start with a really big resistor (or a light bulb), but it might only be microamps. Ed Price ed.pr...@cubic.com <blocked::mailto:ed.pr...@cubic.com> WB6WSN NARTE Certified EMC Engineer Electromagnetic Compatibility Lab Cubic Defense Applications San Diego, CA USA 858-505-2780 Military & Avionics EMC Is Our Specialty - ---------------------------------------------------------------- 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>
