At work we have 3-phase power. I understand the oscillations are 120 degrees apart.

At home I have 2-phase power. Are the oscillations 180 degrees apart? I understand the neutral on a 240v circuit should carry 0 as the phases cancel each other out.

My real question is that if we have a 2-phase motor powered by 2 phases of the 3-phase circuit at work, is the neutral again carrying 0 or would it carry some current because the 2 used phases are not 180 degrees of each other?