Originally Posted by

**gar**
180511-1429 EDT

An important concept is that the sum of two sine waves of identical frequency and that are phase related create a sine wave of the same identical frequency and with some possibly different phase relative to one of the original waves.

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Yes I think that is the key, and how you choose to represent it graphically. Metering line to line could be thought of as just a "regular" single sine function. In this case, the x-axis is one line while the sine wave is the other line. But it could also be graphed as two sine functions, one reflected over the x- axis to make the second one. As gar said, that is mathematically the same as the first case and could be redrawn as such. In this case the x-axis is the center tap. Expressing it with the two functions illustrates the center tap to lines readings better.

Ethan Brush - East West Electric. NY, WA. MA

"You can't generalize"

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