Re: 3w,1ph vs 3w,2ph?
A two-phase system consists of two currents that differ in phase by 90 degrees. (3-Phase is 120 degrees)
For Single Phase: W = E x I x pF
For Two-Phase: W = 2E x I x pF
For 3-Phase: W = E x I x 1.732 x pF
What is bad about Two-Phase systems, is that even with a balnced load, the current on the center-tap is 1.41 times the phase conductors.