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Normal house current is two-phase, 240V. What comes into the house is two hots and a neutral. From hot to hot you get 240V and from either hot to neutral is 120V. In the electrical trade there are only single phase and three phase systems. The reason it is called single phase is that the primary connection on the high voltage side is one leg of a three phase system. This 3 PH system is usually about 12500 volts. On the primary side of the transformer, the connection is between one phase of the three phase system and ground usually in the area of 12,500/1.73 = 7225 volts. The secondary side of this transformer is 240 volts with a grounded center tap. As stated above this is where the 240, 120 voltages come from.

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Q: What is normal house current three wire single double or three phase?
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