There are some semantics issues at play here.
Here in the US 9and maybe Canada?), there are some legacy "true 2 phase" systems in use near Philadelphia and Niagara Falls. This is likely why waross asked you where you live. But in the big scope of North American power distribution, the number of active true 2-phase system installations is infinitesimal, and shrinking because they are not installing new systems as far as I know. Anything new is 3 phase.
In other parts of the world, the term "2 phase" is used to describe "2-out-of-3" phases, in other words you are connecting to Phases A and B of a 3 phase distribution system. Here in North America we still call that "single phase". This is what Keith (itsmoked) was referring to when he mentioned 208/120V because in a 3 phase Wye system, the line-to-line voltage is higher than the line-to-neutral voltage by a factor of 1.732, so 120V x 1.732 = 208V. This is a common distribution system for light manufacturing and commercial installations.
To make matters just a tad more confusing, we have a somewhat unique (from the viewpoint of the rest of the world) residential distribution system where we take single phase power, as in 2 out of 3 phases, from the utility pole as the primary to a transformer and connect a center tapped secondary that provides 240V from line to line and 120V from line to neutral (the center tap point). We still call that "single phase" as well. This is what X49 is referring to, although I think most of us would agree that we generally do not refer to the two ends of that center tapped transformer as "phases" just because it confuses the masses.
But nowhere do he have a system that is 120V line-to-line, 2 phase. Someone is confused, it happens a lot with people unfamiliar with the quirks of our system.
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