Hi Brian, My understanding is that GTEMs struggle when anything involving cables is mentioned, presumably because no one can agree on an accurate, consistent, standardised method for routing them out of the test volume. 61000-4-20 has a clause in it that states that EUTs with cables are under consideration or outside the scope of the standard (I don't have it in front of me).
Al the best James James Pawson Unit 3 Compliance www.unit3compliance.co.uk -----Original Message----- From: Brian O'Connell [mailto:oconne...@tamuracorp.com] Sent: 18 July 2017 18:23 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Chamber grounding [General Use] Warning Will Robinson - Brian is not an EMC expert. Agree with Herr Gremmen about the referencing of equipotential points - this was critical for my employer's current chamber because it was sitting next to a machine shop and a HALT chamber. Would suggest two or three cups of tea, followed by some ale, while pursuing a good reading of the EN50147-x series and ANSIC63.4 and CISPR16 and the various Bugs Bunny cartoons. Related question - am wondering why, other than physical size of UUT, industry prefers anechoics in lieu of GTEMs? Brian From: Gert Gremmen [mailto:g.grem...@cetest.nl] Sent: Tuesday, July 18, 2017 8:49 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Chamber grounding [General Use] As for the purpose of operation, EMC chambers need no grounding. The shielding property happens by conduction of the shield material the chamber is made from. But as soon as mains filters are mounted on the wall, one has to cope with leakage currents (blind current) as large as 6 amp or more. This is definitely lethal on the touch so I recommend a grounding of 4-6mm2 copper in addition to the ground lead in the mains connection. I suggest leading both grounds to the building ground, as that is an equipotential point, made for safety. But again, an ungrounded chamber performs the same as a grounded one. Gert Gremme -----Oorspronkelijk bericht----- Van: Price, Andrew (Leonardo, UK) [mailto:andrew.p.pr...@leonardocompany.com] Verzonden: dinsdag 18 juli 2017 16:55 Aan: EMC-PSTC@LISTSERV.IEEE.ORG Onderwerp: Re: [PSES] Chamber grounding [General Use] Hi All Which is the best to use? Ground each EMC chamber via an earth spike or back to the transformer of the supply to the building? Which is best practice? Regards Andy Andrew Price Land & Naval Defence Electronics Division Prinicpal Environmental Engineer (EMC) Leonardo MW Ltd Sigma House, Christopher Martin Rd, Basildon SS14 3EL, UK Tel EMC LAB : +44 (0)1268 883308 Mobile: +44 (0)7507 854888 andrew.p.pr...@leonardocompany.com<mailto:andrew.p.pr...@leonardocompany.com > leonardocomapany.com HELICOPTERS / AERONAUTICS / ELECTRONICS, DEFENCE AND SECURITY SYSTEMS / SPACE * Please consider the environment before printing this email. Leonardo MW Ltd Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL A company registered in England & Wales. Company no. 02426132 ******************************************************************** - ---------------------------------------------------------------- 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 email has been checked for viruses by AVG. http://www.avg.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>
