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Another sub question?

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'Ground' is the reference point.


Correct, if you mean the center point of the transformer. This agrees with what I said. If you measure between two points on the same plane there is no difference. Try to measure voltage between the 2 screws of a single pole switch. you will not get a reading. Does this mean that there is no voltage? No it it just that there is no difference of potential between them. Without a reference you do not have a way to measure voltage.

Ground could be at 500 volts and a hot leg at 620. All the sytem sees is that there is a difference of potential of 120 volts.

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