Re: 120/208 Single Phase
What is happening is you are providing two legs of a three phase source to a meter that has a neutral potential lug (normally at the 9:00 position) so the customer (normally residential in an apartment building) will have a normal single phase service. The problem is that the two legs are separated by 120 degrees instead of 180 degrees and for water heating, electric ranges, ovens, and electric dryers, he gets 208 volts instead of 240 volts. The meter center gets all three phases and each meter gets different pairs of phases. If a meter center has 12 meters, 4 would have A and B, 4 B and C, and 4 C and A. I hope I haven't muddied the water any.