Brian Gaff (Sofa) wrote:

Yes one issue that has come up though is the method used to measure the
power used. Gass is pretty easy since it relies on flow, but Electricity can
be influenced by the phase of the current draw in the AC voltage waveform,
and there have been questions before on what is the most accurate way to
deal with this aspect.
Brian
I don't think there is any question at all about *how* to do it; just
how well various electronic meters perform, especially with unusual
waveforms.

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Roger Hayter