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The rest of the world is 50Hz, Grow up!!.
Man, don't get me started on 50Hz! I work sites all around the world, and every time we have 50Hz it's a headache. The voltages aren't that big a deal, but having to derate all these UPS systems because the magnetic flux is saturating the transformer core is just killing me... Wanting a 750kVA and having to pay for a 750 but only getting a 625, man, it hurts. Can't even throw money at 'em to rewire the transformers with a different core because the 50Hz transformers are too big! 60Hz is 20% more efficient, why don't ya'll just give it up and switch to 60Hz? All your motors and transformers would be smaller and cheaper ya know!

The worst is when there is a mix of US and european voltages and frequencies, that tends to get messy...

[This message has been edited by SteveFehr (edited 06-27-2006).]