The phase angle determines what you get.

Anyway - most 3-phase apartment house services are in fact 180 split windings.
e.g. delta with centers of the delta sides are grounded. You don't get
multiple phases for normal home use.

Martin

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On 6/9/2010 11:27 PM, Josepi wrote:
Or 120 degrees out of phase if fed off a network three phase system. Ths can
be common in apartment buildings or large residental blocks. Now you get
the vector sum of two loads and have to consider the power factor also.

The end result is a low current, in the neutral, anyway, unless you have pf
correction on one and not the other. Not likely in a residence.


"Martin H. wrote in message
...
Actually, the currents are added. The effect is subtraction.

One leg has a -1 vector tagged to it so when adding it becomes subtraction.

Remember in the US and many other places the two voltages are 180 degrees
out of phase with the other.

Martin