It's not my consensus! Yes, the building ground is likely to be noisy, unless you actually connect directly back to its earth spike. Even then, the wire you use is an inductor and may have noise induced in it.
I am quite sure that BS 7671 and other Code standards do not recognize that a screened room is outside their scopes. With best wishes DESIGN IT IN! OOO - Own Opinions Only www.jmwa.demon.co.uk J M Woodgate and Associates Rayleigh England Sylvae in aeternum manent. -----Original Message----- From: Price, Andrew (Leonardo, UK) [mailto:andrew.p.pr...@leonardocompany.com] Sent: 19 July 2017 07:16 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Chamber grounding [General Use] Thanks all for the replies. It seems that there is some divided opinion. Some of the test houses I have spoken to state that they definitely ground their chambers via ground spikes. This is to remove low frequency noise that causes issues with the low frequency emc tests that are required in mil-std, def stan and rtca/do-160. One test house I spoke to stated that as a result of cost cutting an earth spike was not fitted so earthing was taken to building ground, as a result of this the test house has issues with low frequency noise. The consensus of the forum is that a ground spike should not be required and the building ground used should be enough. This then probably raises the question of how good is the building ground? Is there a requirement for this? If there is noise on the building ground how can this be eliminated? 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 email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. ******************************************************************** - ---------------------------------------------------------------- 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>