Lou, Thanks for the information, we ran across this in an old building located in Santa Clara, California.
There was no transformer located outside the building, just the drop lines from the power pole. The transformer may be located inside the main distribution panel in the electrical room, however we did not want to open any panels to look for it. Regards, Richard At 10:04 PM 6/5/03 -0500, you wrote: >Richard, I recognize that system. > >It is a 3 phase delta with one of the sides tapped in the middle for the >neutral. I haven't seen one since the late 50's, and then only in the >oldest sections of downtown Houston. The scheme provided 3 phase service to >AC compressors and air handlers, and also supplied 110 volts for lighting >and office equipment. > >The 208 phase you found was then known as the "wild phase" or the "stinger >leg". It was about 190 volts when the phase to phase voltage was 220. The >relationship to 240 does work out; 190 X (240/220) = 207; nearly what you >found. > >If you look outside the building you should be able to see the transformer >connections to confirm this. > >I had almost forgotten such a thing ever existed. > > >Lou Aiken, LaMer LLC >27109 Palmetto Drive >Orange Beach, AL >36561 USA This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
