2 ms·

I should have said two 120V legs offset 180°.

• jacquesm 5y ago
  That's accurate. In NL until the 70's we had two levels of delivery, 127V (phase to ground, transformer in 'star' configuration) and 220V (phase to phase, transformer in 'delta' configuration). The latter is interesting because it doesn't actually have a neutral wire at all. The former was close enough that you could get away with plugging in US or Japanese devices, but if there was anything synchronous in there you'd be out of luck (50 Hz vs 60 Hz). Then 220V became the standard and now it is all 240. Interesting tidbit: there was so much inertia from older systems that needed upgrading in this that it took until 2004 until the last of it (the 127->220V change) was finally done.