[Shop-talk] 130v/260v?

[Ronald.Griffing at comcast.net]

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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