yes, agree completely: customers and suppliers can agree to tailor where it makes sense... and that tailoring can be contained within the contract.
On Tue, Jan 15, 2019 at 3:13 PM Ken Javor <ken.ja...@emccompliance.com> wrote: > Disagree totally. Unless the Customer pre-emptively states otherwise > contractually, MIL-STD-461F/G are very clear that power is not to be > shielded during EMI testing, regardless of the platform installation wiring > diagrams. > > This was always meant to be the case, but it was abused precisely as below > and that is why the blanket prohibition against shielding was inserted in > “F” and retained in “G.” > > Ken Javor > Phone: (256) 650-5261 > > > > ------------------------------ > *From: *Patrick <conwa...@gmail.com> > *Reply-To: *Patrick <conwa...@gmail.com> > *Date: *Tue, 15 Jan 2019 14:19:32 -0700 > *To: *<EMC-PSTC@LISTSERV.IEEE.ORG> > *Subject: *Re: [PSES] MIL-STD-461 and power cables sanity check > > ( not really addressing your question, but possibly of interest...). Note > that 4.3.8.6 explicitly states cable assemblies shall simulate actual > installation and usage. If your installation requirements include shields > on all cables, including primary power, then a discussion with the > procuring authority is needed, with possible tailoring, to make sure test > configurations meet expectations. > > > > On Tue, Jan 15, 2019 at 9:27 AM James Pawson (U3C) < > ja...@unit3compliance.co.uk> wrote: > > Hi Ken, > That makes sense, thanks for the clarification. > James > > > > *From:* Ken Javor <ken.ja...@emccompliance.com> > *Sent:* 15 January 2019 15:34 > *To:* EMC-PSTC@LISTSERV.IEEE.ORG > *Subject:* Re: [PSES] MIL-STD-461 and power cables sanity check > > The issue is with primary power: that supplied by the platform to > electrical and electronic loads. It does not apply to secondary power > developed in a load and supplied to another load. It has nothing to do with > dc vs. ac. If a load were supplied with 28 Vdc power from an aircraft > platform and subsequently converted that to say 24 Vac at 400 cycles to run > some other circuitry, the dc power would be subjected to the wording you > cited, but the ac power would not. > > Ken Javor > Phone: (256) 650-5261 > > ------------------------------ > > *From: *"James Pawson (U3C)" <ja...@unit3compliance.co.uk> > *Reply-To: *"James Pawson (U3C)" <ja...@unit3compliance.co.uk> > *Date: *Tue, 15 Jan 2019 08:21:24 -0000 > *To: *<EMC-PSTC@LISTSERV.IEEE.ORG> > *Subject: *[PSES] MIL-STD-461 and power cables sanity check > > Hello all, > > MIL-STD-461 has a requirement for any conductors in a cable assembly > carrying “primary power” i.e. AC power from a vessel distribution bus to be > separated out from the main cable bunch and routed separately in a test > setup (clause 4.3.8.6). It also states that the primary power cables shall > not be shielded. > > I understand the rationale for this, the explanatory notes at the end of > the standard are most helpful. > > My interpretation is that: > > > 1. this only applies to AC power buses (like those referenced in > MIL-STD-1399 > <http://everyspec.com/MIL-STD/MIL-STD-1300-1399/MIL-STD-1399-300B_13192/> > <http://everyspec.com/MIL-STD/MIL-STD-1300-1399/MIL-STD-1399-300B_13192/> > ) and not to DC power supplied from another part of the EUT or from some > Associated Equipment > 2. power supplied in this fashion can be supplied within a shielded > cable if that is what is specified in the final installation > > > Having not done any MIL-STD work before I just wanted to make sure my > interpretation was correct? > > Many thanks as always, > James > > > James Pawson > Unit 3 Compliance > > > - > ---------------------------------------------------------------- > > 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) <http://www.ieee-pses.org/list.html> > <http://www.ieee-pses.org/list.html> > 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) <http://www.ieee-pses.org/list.html> > <http://www.ieee-pses.org/list.html> > 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 & > LT;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) <http://www.ieee-pses.org/list.html> > <http://www.ieee-pses.org/list.html> > 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> > > -- > // > Patrick > - > ---------------------------------------------------------------- > > 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) <http://www.ieee-pses.org/list.html> > <http://www.ieee-pses.org/list.html> > 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) <http://www.ieee-pses.org/list.html> > 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> > -- // Patrick - ---------------------------------------------------------------- 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>
