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Originally Posted by Hollowcell
I don't know alot about grounding and power setups, but I do know over here in Japan the standard wall power out-lets do not have earth.
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In these cases it's good to have a protective separation transformer and always get an extension cord big enough to fit all of your gear in one extension cord. Making a daisychain with extension cords is not a good thing.
Other problem is that if you take power from two different outlets, there might be in a different phase. This means that in worst case you have 230V potential difference between the grounds and that will cause hum and hiss.