| http://www.w3.org/ns/prov#value | - Apparatus as claimed in claim 23 wherein the sampling and digitising means is controlled to sample the instantaneous voltage and current in each of the phases of the supply and provide digitised samples of each of the parameters at a sampling rate nF where F is the supply frequency and n is an integer greater than one, and wherein the computer means is programmed to calculate a value for the or ea
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