If I got your attention then it means you probably have received some education from or at least read some of Allaboutcircuits.com articles and text. And you probably are familiar with the following text:

" A split-phase power system is one with multiple (in-phase) AC voltage sources connected in series, delivering power to loads at more than one voltage, with more than two wires "

I am having some definition or incorrect labeling problems with this text
My question is, does split-phase have 2 sine waves in phase or out of phase with each other. If they are out-of-phase, is it by 90 degrees or 180.

https://www.allaboutcircuits.com/textbook/alternating-current/chpt-10/single-phase-power-systems/

 

In split-phase power system, two sine waves are out-of-phase by 180°.
In 3-phase power system, three sine waves have phase differences of 120°.

 

In split-phase power system, two sine waves are out-of-phase by 180°.
In 3-phase power system, three sine waves have phase differences of 120°.

What about now.

 

What about now.

But they are 180° out-of-phase, but with respect to "neutral" wire. When the top "hot" wire is at +120V with respect to "neutral" wire, the bottom one "hot" wire is at -120V with respect to "neutral" wire. And this is why the voltage difference between the two "hot" wires is +120V - (-120V) = 240V

 

But they are 180° out-of-phase, but with respect to "neutral" wire. When the top "hot" wire is at +120V with respect to "neutral" wire, the bottom one "hot" wire is at -120V with respect to "neutral" wire. And this is why the voltage difference between the two "hot" wires is +120V - (-120V) = 240V.............

I agree, but it am being told that when both bottom and top wire are measured to each other that the sign wave becomes in phase in order to add up to 240v.

 

The misconception is in the way you have drawn the circuitry.
The upper and lower sine wave sources are in phase. However, the way the lower source is drawn, with +ve terminal connected to NEUTRAL, this is, in fact, introducing a phase reversal (i.e. 180° phase shift).

 

This is one of a pair of duplicate threads, and it no longer open for comment. Please join the parallel discussion at the link below.

https://forum.allaboutcircuits.com/threads/240v-split-phase-correction.139626/

@Mac Rodriguez We allow only one thread per discussion so please refrain from posting multiple threads in the future.