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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There was very few of those services used in my area, usually in commercial establishments. At the time it seemed like a good idea. The customer didn't have to pay two electric bills.
It seemed that, in many instances, a 3 phase corner grounded delta or an open delta configuration, that only used 2 transformers was used.