At least on US Navy surface ships, power is not referenced to structure. Green wires connect to structure but a single phase can short to ground and not cause a problem.
Ken Javor Phone: (256) 650-5261 From: Richard Nute <[email protected]> Reply-To: <[email protected]> Date: Sun, 14 Jul 2019 14:27:31 -0700 To: <[email protected]> Subject: Re: [PSES] Ground on ship For us safety nerds, grounding provides an equipotential environment, which means no current through the body. And, the grounding circuit provides a return path for fault current. We don't pay attention to Gnd0, Gnd1, Gnd2, Gnd-Iso, etc.; for safety purposes, they are all at the same potential -- ground. While Gnd-Iso may not be at ground potential, current from Gnd-Iso to ground should be inconsequential. So, for us safety nerds, "ground" is our (lazy) way of referring to an equipotential environment. Best regards, Rich On 7/13/2019 2:31 PM, Doug Powell wrote: > > > > > > This is purely speculation on my part but it seems to me that the single > syllable "ground" is a lazy way of referring to anything that is a common > return line, whether bonded to earth or not. I've seen circuits with > references to Gnd0, Gnd1, Gnd2, Gnd-Iso, etc. > > > > > Of course, this shorthand way of referring to circuits does cause a lot of > confusion. And, I personally classify this as falling into the same category > as when people with an inexperienced eye say this bit of failed electronics > "must have a short somewhere" . > > > > > Doug > > > > > -- > > Douglas E Powell > > [email protected] > > https://www.linkedin.com/in/dougp01 > > > - ---------------------------------------------------------------- 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 <[email protected]> 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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher <[email protected]> David Heald <[email protected]> - ---------------------------------------------------------------- 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 <[email protected]> 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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
