( 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> > 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>
