Quote:
Originally Posted by wa2ise
In my town in northern NJ, some high-end houses built in the 1950s had central air installed when they were built. Back then, central air systems needed 3 phase power, and the power company (Pubic Service Electric and Gas) supplied 240V delta, with one of the phases centertapped grounded, to supply 120V ("power and light"). This creates a "wild leg" that measures 208V to ground. Electric code here no longer allows this voltage in a home. Seems some DIYers grabbed the 208V to wire 120V outlets, and blew up some 120V devices...
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I often wondered how 208V developed....now I know. We had 208V lighting in a huge avionics facility I worked in. We had 28V, 3-phase 240, and 3-phase 115V 400Hz, all in huge, 500ft long busses in the overhead, with pigtails down to breakers on the benches. 1967/68 era, but pretty standard for avionics facilities.
Thanks for the enlightenment!
Cheers,