Brian, 416 volts is the phase to phase voltage of a 240/416 v three phase distribution circuit. If you had a circuit with a heavy single phase load from phase A to neutral and a light single phase load from phase B to neutral and then opened the neutral, they would be in series with the phase voltage highest across the lightest load. Depending on what loads and how they are connected, the voltages resulting would be hard to predict but somewhere from zero to approaching the phase to phase voltage. This test would cover almost all conditions for the small single phase appliances in international markets we were discussing.
Bob Johnson ITE Safety <http://www.itesafety.com> Brian O'Connell wrote: Sir Interesting requiremensts. What is the basis of 416V ? Thanks, yet another Brian From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of Robert Johnson Sent: Wednesday, November 08, 2006 2:01 PM To: emc-p...@ieee.org Subject: Re: Worst Case AC Power Conditions It's also useful to know what your product does under non operating conditions. A common fault is open neutral and can happen anywhere from the power cord to across town. This leaves your equipment in series with other unknown loads from phase to phase. This is not something you should expect to use as an operating point. Planning operation under such conditions would appropriately require a UPS. However knowing what your equipment does is good safety practice. It may trip overcurrent protection or just sit and malfunction, but you don't want it to catch fire. Running it at a few operating points between 0 and 416 V gives you an idea of how it will fail. This is not a failure mode tested by the product standards. Bob Johnson ITE Safety ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________ - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.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 emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
