Doug –
I’m not certain what I’m referring to. Hence the question. Since typical 120/240 V split-phase distribution in the US is from a center grounded delta, my inclination is to believe this follows that same method. Or the original proposition I received is incorrect and a three-phase WYE is used on the load side of the distribution transformer. I think I prefer “bastard leg.” Peter T *From:* Doug Powell [mailto:doug...@gmail.com] *Sent:* Wednesday, October 21, 2015 09:01 *To:* EMC-PSTC@LISTSERV.IEEE.ORG *Subject:* Re: [PSES] 208 split-phase? Peter, The idea of a 208 V split phase is unusual and probably not the case here. The number 208 is obviously derived from a three phase system. I believe the system you are talking about is a red-leg or high-leg three phase system. Wikipedia does have a good review in this case ( https://en.wikipedia.org/wiki/High-leg_delta; https://en.wikipedia.org/wiki/Split-phase_electric_power). In the figure on Wikipedia this is a 240 VAC delta with the neutral applied between L1 & L2, creating 120 V split-phases in 180 degree opposition. The 208 is the high leg, L3 in the figure. You can verify the voltages using the bit of trig further down the page. This voltage system is used in many parts of the world but is no longer very common in the USA. The alternative system this could be is a 416 V three phase, delta configured with split phase secondaries at 208 V. I have worked with this configuration in the past. All the best, Doug doug...@gmail.com http://www.linkedin.com/in/dougp01 On Wed, Oct 21, 2015 at 8:21 AM, Peter Tarver <ptar...@ieee.org> wrote: Good morning. There are oftensmall, legacy grids that you come across or hear about. I was recently told that some areas of the Northeast US have a 208 V, split-phase power system to some residences and small businesses. Still 180° phase-to-phase and presumably 104 V phase-to-Neutral. A specific area cited was "around Boston." Has anyone heard of or directly experienced this voltage system? Is it split-phase or was I misinformed and it's from a WYE connected transformer? Peter Tarver ptar...@ieee.org - ---------------------------------------------------------------- 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> -- Douglas E Powell doug...@gmail.com http://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 < 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) 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>
