It depends if you want a single point ground or a distributed ground. For some applications there is a recommendation to use a “ufer” grounding scheme which is essentially a buried grounding grid.
At our building, we were able to drill through our concrete floor and install grounding rods about 8feet or about 2.5m deep into earth. No need to place the shield room near the building’s side (unless you are above ground on a multi-story building) Our EMC semi-anechoic chambers were intentionally isolated from ground and only grounded at key locations per the manufacturer’s instructions. It would seem that a multiple distributed grounding scheme might have been better. Best Regards Hans T Mellberg Vice President of Engineering Bay Area Compliance Laboratories www.baclcorp.com 1274 Anvilwood Avenue Sunnyvale, CA 94089, USA (408)732 9162 x 3601 fax: (408) 732 9164 ________________________________ From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Ian White (UK) Sent: Friday, February 26, 2010 1:24 AM To: IEEE Forum (emc-p...@ieee.org) Subject: Screened room move. We are due to move our EMC screened room within the next year to a new site. It is planned to be placed in a much larger building of steel and concrete construction. We have planned it to be placed close to an outside wall so we can pick up an outside earth which will be bonded in to the mass of the earth for safety reasons Could l hear your ideas on the best solution for earthing the screened room as l feel the present arrangement may be far from ideal. For example is it better to use a number of rod earth electrodes or some sort of steel mesh arrangement buried in the earth for a good RF performance. Thanks for your help. Regards Ian White (Project Engineer - Electronics) - 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.ieeecommunities.org/emc-pstc 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...@socal.rr.com> 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.ieeecommunities.org/emc-pstc 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...@socal.rr.com> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org> David Heald <dhe...@gmail.com>
