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This calculation uses current measurements taken on a balanced motor circuit, with a working capacitor installed in the circuit. It will not work if the circuit is not balanced. Three accurate readings are needed, preferably from the same phase:
A further explanation is available in pdf format.
This is for entertainment, only. It is not to be relied upon. The information is altered for processing and to display in a predetermined format. It contains errors, has omissions, and is not updated, including with revisions, amendments, regulations, nor interpretations. It is the opinion of the writer, who states that other valid opinions produce other results. No warranty is provided. Liability is denied.