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DIY light source for 10X10" enlarger.
"David Nebenzahl":
"Nicholas O. Lindan": Office lighting systems usually supply a high (and usually bizarre - 347 volts anyone?) voltage from a central step-up transformer Small correction: 277 volts. (It's printed on lots of ballasts.) 277 also. 120, 208, 220, 240, 254, 277, 347, 380, 415, 440, 480 and 600 are the common voltages. 415 for lighting is pretty rare, but I worked in a building that was wired for it. The building super would swear at length about it if anyone would listen. The odd voltages are from 3-phase systems and are phase-phase and phase-ground voltages: 120/208, 220/380, 240/415, 277/480, 347/600. 120/240 normally being a 2-phase pair. The voltages relate either by 2 or the square root of 3 (1.73). -- Nicholas O. Lindan, Cleveland, Ohio Darkroom Automation: F-Stop Timers, Enlarging Meters http://www.darkroomautomation.com/index2.htm n o lindan at ix dot netcom dot com |
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