Quote:
Originally Posted by wa2ise
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.
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Learn something new every day - thank you. I have absolutely never seen this system employed here in western Canada, but everything here is quite new compared with what's out east. I would love to have three phase power at home!