If two generator are connected 180 degrees out of phase. That will be at a minimum a bad sound and opened protective devices. Twisted off shafts, stator windings shifted and contactor/circuit breaker explosions possible.
Canada way back when just like every other country experimented with 25, 33-1/3, 40,50 & 60 cycle power in the late 1800's and early 1900's.
Early in the 1900's the standard was 25 cycle as most of Ontario's and other provinces power was generated by Hydro Electric. By 1955-1957 the standard was 60Hz across all of Canada. With a few odd pockets of 25Hz. Until approx 10yrs ago Beck 1 at Niagara. They still made 25Hz to supply the Hamilton Steel mill's motor generator sets to run the DC motors on the rolling mills to hot forge steel to shape.
Voltages are 120/240 single phase. 120/208 and 347/600 three phase. No weird *ss tapped or corner ground Delta systems.
There are a few commercial buildings In Toronto etc built in the late 1960's with European 240/416 voltage but North American 60Hz.
The idea was to have just one simplified electrical service in the building. 240V for lights and all office equipment like in Europe. 416V for all three phase motors like Europe.
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