Quote:
Originally Posted by maxhifi
Lots of apartments and for that matter condos have 208 volt services, the dual rating makes sense. Usually the motor operates off 120 in a dryer so it gets full voltage either way and you just get a bit less heat output.
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If you had a place that had 3 phase 240V "power and light" (the "light" means the usual grounded centertapped 240V power, and "power" is a "wild leg" 2nd phase 240V connected to one of the legs of the "light", creates a delta pattern 240V. the wild leg to ground measures 208V. You could connect the 240V heater element across that 2nd phase 240V, and the 115V motor connects between the neutral (ground) and the "light" 115V line. Also any 115V electromechanical timers as well.
There's single family houses in my town that are fed this 240V delta pattern "power and light". Dating back to the late 50's, when central air was a rare luxury. They must have used industrial HVAC units, thus requiring the "power and light" connections. Electrical code doesn't allow anything above 125V to ground in a house anymore, these places must be grandfathered.