Quote:
Originally posted by Intrepid:
quote:
Originally posted by Sir Krustin:
I suspect you just crossed both "sides" of your house line. One black was probably 180 degrees out of phase with the other - resulting a dead short at 240v instead of 120v (this is how you get 240 for the stove and dryer)
You also see this kind of arrangement in kitchen split circuits.
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how are the waveform phases altered? i didn't realise that was possible... well in a simple device like UPS. [/QUOTE]It's not on the ups, it's the way the house mains are wired. There are actually TWO different live wires coming into the house, and one neutral. The two live (black) wires have the same voltage, but are opposite in phase.
Like bungleau says, it's used to spread the load better.