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Yes well when you get into three phase power as we have it here in Australia, you have 240 V to neutral and 415 V between each phase. If you have a star configuration you have a neutral but in delta you do not have a neutral. When I was in supplying fluorescent ballsts; sometimes in a big building in the city the phases would get out of balance when the building was first being set up and you would get hellish current in a very small neutral conductor that really should not have much going through it at all. Then as buildings got bigger and bigger and more and more fluorescent lighting was used a new thing (back in the sixties new) called harmonic distortion which only seemed to affect the odd harmonics ie 3, 5 and for some reson particularly 7. Horrific neutral currents also occured under these circumstances as well. It seems the worse the ballast the better the harmonic distortion was. So I can see that the American system of only having two phases each of 115 V must have its drawbacks. The main thinhg I wanted to discuss was upping the frequqency I'm sure it will have benefits not just to do with flicker which mainly affects your perifery vision anyway. Rgds Ian
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