Jeff,
Actually, this is not true. Household electrical
services in the US are pretty much exclusively
"split-phase" systems. The transformers are 230-240V
with the neutral on the center tap, so that there is
115 - 120V between the neutral and each side of the
transformer. But they are single phase.
http://en.wikipedia.org/wiki/Split_phase
-Steve
--- Jeff Keller <jrk_om@xxxxxxxxxxx> wrote:
>
> The electricity coming into a US house is almost
> always two hot wires whose
> voltages alternate between plus and minus exactly
> out of phase. Since one
> will be positive while the other is negative the
> "peak" voltage between them
> is 220-230 volts (each changes polarity and of
> course amplitude). The
> voltage from either wire to ground will only be
> 110-115 volts "peak".
>
>
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