>I am quite sure that BS 7671 and other Code standards do not recognize that a >screened room is outside their scopes
Of course they won't..... But it is, technically. Gert -----Original Message----- From: John Woodgate [mailto:jmw1...@btinternet.com] Sent: Wednesday 19 July 2017 09:31 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Chamber grounding [General Use] 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? 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