I have been curious about this for a while, but unable to find an
answer online. My house has standard residential AC electrical service,
100a at a nominal 120v. Whenever I put a meter on a circuit, though, I
always measure about 130v. Similarly, on the double-pole breaker circuit
I just installed for my welder (nominally 240v) I measure ~264v. I have
used at least three different (cheap) meters, all with similar results.
Is this highly unusual? For a given resistance, 264v is going to
provide about 10% more current than the nominal standard on the
double-pole circuit. Is this risky or problematic? The single-pole
circuits have been in-place for years, with no apparent problems, but I
obviously don't want to blow up my Syncrowave.
Thanks.
--
David Hillman
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