If your meter is measuring peak to peak, that's about right. The given voltage
is in Root Mean Square, or RMS which will be lower than the peak-to-peak.
----- Original Message -----
From: "David Hillman" <hillman at planet-torque.com>
To: shop-talk at Autox.Team.Net
Sent: Wednesday, March 30, 2011 10:47:28 AM
Subject: [Shop-talk] 130v/260v?
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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