I encountered the following description of an audiophile's house power:
He lives in Canada and says the power into the house is "single phase 120V/240V AC 60 HZ, 3 wire (red, black, white (N) with ground," Is this typical for the United States as well or something peculiar to Canada or other non-US countries? Am I to understand that the voltage between red/white and black/white is each 120V, but between red and black is 240 V?
He writes that each of his two systems (2-channel and A/V) has a separate circuit with an isolation transformer with a 240V primary and "120/240V secondary" (not sure why two voltages are given for the secondary--maybe two taps?) He writes that he's using 240 V into the isolation transformer in order to reduce the current draw and reject common-mode noise. Can someone explain in what sense this will reject common-mode noise? Common-mode between what two lines? Or is that not clear?