On Monday, 10 December 2018 16:58:22 UTC, Fox's Mercantile wrote:
On 12/10/18 6:22 AM, tabbypurr wrote:
On Monday, 10 December 2018 11:42:17 UTC, Fox's Mercantile wrote:

Actually, the term "Split Phase" is accurate.
The source is a center tapped 240 volt winding.
-180 0 +180 degrees.
Either side to center (neutral) is 120v, and across both sides (hot)
is 240v.
The usual problem is when people insist on calling it 2-phase due to
the ± nature of it.
It is not, the primary is single phase.

3 phase has an angle between each phase of 360/3 = 120 degrees.

Correct.

2 phase has an angle between each phase of 360/2 = 180 degrees.
And that's what you have with the US domestic 120/240 system.

Absolutely NOT. That is center tapped single phase.

It's one of the 3 phase distribution system's phases, centre tapped, that is its source. That does not change the fact that it's 2 phase.

In the early days of electrical generation, there was 2-phase, but the
two phases were offset by 90 degrees.

I've read various times of 2 phase systems with 180 degree offset, but not seen 90 degrees.


NT