All good names. I don't know officially what the power companies call it or the NEC but I like to call it "Split Phase". It rolls off the tongue nicely. I've been told this term is incorrect but I have been trying to get others to use it.
Wikipedia must agree because there are several references to "Split Phase" in reference to this type of North America power system. http://en.wikipedia.org/wiki/Split-phase_electric_power On another wiki page for "Single Phase Electric Power" it states, "In some countries such as the United States, single phase is commonly divided in half to create split-phase electric power for household appliances and lighting." Another common reference on wiki is "three-wire single-phase", but when you click on it it will take you to the Split-Phase page listed above. The Other Brian From: [email protected] [mailto:[email protected]] Sent: Tuesday, June 05, 2012 7:31 PM To: Kunde, Brian Cc: [email protected] Subject: Re: [PSES] Follow on to EN 61000-4-5 Surge Question, How is Voltage configur ed? A "single-phase, split-voltage" or "single-phase, 3-wire service " are likely better names for our peculiar 120/240V a.c. system here. _______________________________________________________________________________ Ralph McDiarmid | Schneider Electric | Solar Business | CANADA | Regulatory Compliance Engineering From: "Kunde, Brian" <[email protected]<mailto:[email protected]>> To: [email protected]<mailto:[email protected]> Date: 06/05/2012 01:39 PM Subject: Re: [PSES] Follow on to EN 61000-4-5 Surge Question, How is Voltage configur ed? ________________________________ Since this is mainly for Europe, we perform the test at 230VAC 50hz with a grounded neutral which I believe is the most common power system in most areas, but not all. I believe you are correct; AC power in Europe is generally derived from 3-phase where 230VAC is the voltage from Line to Neutral. In most locations the neutral is at earth ground potential but not everywhere. In some areas the neutral is floating (so I have been told). In North America, 220VAC single phase center tap systems (sometimes incorrectly called two phase or split phase) is most common in residential and commercial locations, but not commonly found in industrial locations. For instance, our EMC lab is in an industrial area and we do not have split phase. Our 115VAC is derived from 208 with a grounded neutral. So when we test residential 220V appliances we have to use 208 which is technically not correct, but as close as we can get. Our 208 runs a bit high and runs around 215V. Hope this was helpful. The Other Brian From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Larry Stillings Sent: Tuesday, June 05, 2012 11:43 AM To: [email protected]<mailto:[email protected]> Subject: Follow on to EN 61000-4-5 Surge Question, How is Voltage configur ed? Firstly, thank you for those whom responded to my EN 61000-4-5 lightning surge question last week My follow on question, is how should the 230 VAC, 50 Hz Source be configured for mains power. Is using 230 VAC consisting of 115 volts from Line to ground, and 115 volts from neutral (l2) to ground acceptable, or should the AC source be configured to apply 230 VAC on Line to Ground, and Neutral or L2 configured to be around 0 volts. Here in the USA we have two phases, although we call it single phase which brings in 120 VAC on Line 1 and 120 VAC on Line 2 to provide 240 VAC, 60 Hz, unless of course you have a building where one of the three phases is tapped, but then my understanding is that is what is called 208 VAC, 60 Hz. However, I mainly interested in how power is configured in Europe. From what I read it is derived from either 415 3-Phase which gives 240 Volts on line, or 380 3-Phase which gives 220 Volts on line, and 230 Volts on line was a compromise between the two ? Larry K. 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If you received this by mistake, please destroy it and notify us of the error. Thank you. - ---------------------------------------------------------------- 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://listserv.ieee.org/request/user-guide.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]>
